Sample records for jacket type offshore

  1. Dynamic characteristics of a jacket type offshore structure considering non-linear behavior of pile foundations

    SciTech Connect

    Aaghaakouchak, A.A.; Asgarian, B. [Tarbiat Modarress Univ., Tehran (Iran, Islamic Republic of). Dept. of Civil Engineering

    1996-12-31

    Dynamic characteristics of a typical six legged jacket type platform in Persian Gulf have been studied. An equivalent linearized pile stub has been used to model the pile-soil system. The properties of pile stub have been calculated for different levels of the pile-head deformations resulting from the action of different waves. Natural frequencies and mode shapes of resulting linear models have been determined and compared to each other.

  2. Friction damper for vibration control in offshore steel jacket platforms

    Microsoft Academic Search

    A. A. Golafshani; A. Gholizad

    2009-01-01

    The performance of friction dampers to mitigate the wave-induced vibrations in jacket-type offshore platforms has been investigated in this study. Due to the random nature of ocean waves, a full stochastic analysis method has been used to evaluate the response of the structures equipped with these devices. A stochastic linearization technique has also been used to take the nonlinear behavior

  3. Seismic Performance Evaluation of the Jacket Type Offshore Platforms through Incremental Dynamic Analysis considering Soil-Pile-Structure Interaction

    NASA Astrophysics Data System (ADS)

    Asgarian, Behrouz; Shokrgozar, Hamed R.; Talarposhti, Ali Shakeri

    2008-07-01

    Of great interest in Performance-Based Earthquake Engineering (PBEE) is the accurate estimation of the seismic performance of structures. A performance prediction and evaluation procedure is based on nonlinear dynamics and reliability theory. In this method, a full integration over the three key stochastic models is as follow: ground motion hazard curve, nonlinear dynamic displacement demand, and displacement capacity. Further, both epistemic and aleatory uncertainties are evaluated and carried through the analysis. In this paper, jacket and soil-pile system have been modeled using Finite Element program (OpenSees) and the incremental dynamic analysis (IDA) are performed to investigate nonlinear behavior of offshore platforms. The system demand is determined by performing time history response analyses of the jacket under a suite of FEMA/SAC uniform hazard ground motions. The system capacity in terms of the drift ratio against incipient collapse is generally difficult to predict since the structural response goes into nonlinear range before collapse. All the analyses are performed in two directions and the results are compared with each others. The confidence level of a jacket in each direction for a given hazard level is calculated using the procedure described.

  4. Seismic Performance Evaluation of the Jacket Type Offshore Platforms through Incremental Dynamic Analysis considering Soil-Pile-Structure Interaction

    SciTech Connect

    Asgarian, Behrouz [K.N. Toosi University of Technology Tehran Iran (Iran, Islamic Republic of); Shokrgozar, Hamed R.; Talarposhti, Ali Shakeri [K.N. Toosi University of Technology, Tehran (Iran, Islamic Republic of)

    2008-07-08

    Of great interest in Performance-Based Earthquake Engineering (PBEE) is the accurate estimation of the seismic performance of structures. A performance prediction and evaluation procedure is based on nonlinear dynamics and reliability theory. In this method, a full integration over the three key stochastic models is as follow: ground motion hazard curve, nonlinear dynamic displacement demand, and displacement capacity. Further, both epistemic and aleatory uncertainties are evaluated and carried through the analysis.In this paper, jacket and soil-pile system have been modeled using Finite Element program (OpenSees) and the incremental dynamic analysis (IDA) are performed to investigate nonlinear behavior of offshore platforms. The system demand is determined by performing time history response analyses of the jacket under a suite of FEMA/SAC uniform hazard ground motions. The system capacity in terms of the drift ratio against incipient collapse is generally difficult to predict since the structural response goes into nonlinear range before collapse. All the analyses are performed in two directions and the results are compared with each others. The confidence level of a jacket in each direction for a given hazard level is calculated using the procedure described.

  5. Long-term fatigue analysis of multi-planar tubular joints for jacket-type offshore wind turbine in time domain

    Microsoft Academic Search

    Wenbin Dong; Torgeir Moan; Zhen Gao

    2011-01-01

    Long-term fatigue analysis of welded multi-planar tubular joints for a fixed jacket offshore wind turbine designed for a North Sea site in a water depth of 70 m is performed. The dynamic response of the jacket support structure due to wind and wave loads is calculated by using a decoupled procedure with good accuracy (Gao et al., 2010). Hot-spot stresses

  6. Nonlinear and Robust Control Schemes for Offshore Steel Jacket Platforms

    Microsoft Academic Search

    Mohamed Zribi; Naif Almutairi; Mohamed Abdel-Rohman; Mohamed Terro

    2004-01-01

    This paper presents two control schemes to control the dynamicresponse of an offshore steel jacket platform due to wave-inducedforces. The objective of the controllers is to greatly reduce theinternal system oscillations and to obtain a smooth response ofthe steel jacket platform when subjected to nonlinear self-excitedhydrodynamic forces. The first controller is a nonlinearcontroller whose design is based on Lyapunov theory.

  7. Dynamic response of offshore jacket structures under random loads

    Microsoft Academic Search

    Ahmed A. Elshafey; Mahmoud R. Haddara; H. Marzouk

    2009-01-01

    In this paper, the dynamic response of a scale model of a jacket offshore structure is investigated both theoretically and experimentally. The experiments were conducted both in air and in water. The in-water experiments were done in the towing tank of Memorial University to simulate the realistic operating conditions. The model was subjected to random wave loads. Froude's law of

  8. Passive control of offshore jacket platforms

    Microsoft Academic Search

    K. C. Patil; R. S. Jangid

    2005-01-01

    The wave-induced dynamic force is one of the most important excitations to be dealt with in the design of offshore structures. In order to perform a reliable design of an offshore structure, it is important to obtain an exact evaluation of its dynamic response but also to examine the ways of reducing the response. This paper presents the response of

  9. Multiloop feedback control of offshore steel jacket platforms

    Microsoft Academic Search

    M. J. Terro; M. S. Mahmoud; M. Abdel-Rohman

    1999-01-01

    In this paper, a new multi-loop feedback-control design is developed and applied to an offshore steel jacket platform. The platform is subjected to wave-induced self-excited hydrodynamic forces. The nonlinear Morison equation is employed to estimate these wave forces. The feedback control design proceeds in two consecutive loops: an inner loop for regulating a linear part of the platform dynamics and

  10. Repairing an offshore jacket structure proves cost effective

    SciTech Connect

    Still, J.R.; Blackwood, V.

    2000-05-01

    During inclement weather in the southern North Sea, an off-shore supply boat collided with a 25-year-old gas production platform. The impact occurred just over 2 m (5.56 ft) from the lowest annual tide and was sufficient to buckle, then shear, one end of a horizontal bracing from the jacket leg and to cause further damage at a node joint. Inspection personnel performed an initial examination of the damage to the eight-leg jacket structure using rope access techniques (abseiling), which offered substantial cost saving over erecting scaffolding. A structural analysis confirmed the jacket's integrity was not impaired and loss of the horizontal bracing would not significantly affect the structure. The analysis also confirmed repair of the node weld cracks and of the sheared area on the leg should be performed as soon as practical. In the end, the repair went smoothly. The repair area was above the waterline, and the weather cooperated perfectly. The repairs were done using rope access techniques, and using austenitic electrodes reduced the possibility of HAZ hydrogen cracking. Nondestructive examination confirmed no cracking had been experienced and no other defects existed. Indeed, this methodology is considered extremely practical, cost effective and ideal for use on offshore structures--with damage close to the waterline, and with the need to execute immediate repairs.

  11. SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES

    E-print Network

    Paris-Sud XI, Université de

    SUBSPACE-BASED DETECTION OF FATIGUE DAMAGE ON JACKET SUPPORT STRUCTURES OF OFFSHORE WIND TURBINES-based Damage Detec- tion (SSDD) method on model structures for an utilization of this approach on offshore wind damage in real size structural components of offshore wind turbines. KEYWORDS : Damage detection

  12. Vibration control of steel jacket offshore platform structures with damping isolation systems

    Microsoft Academic Search

    Jinping Ou; Xu Long; Q. S. Li; Y. Q. Xiao

    2007-01-01

    In this paper, a damping isolation system is developed for vibration control of steel jacket offshore platform structures. At first, a damping isolation system composed of rubber bearings and viscous dampers is proposed for vibration mitigation of JZ20-2MUQ jacket platform located in Bohai Sea. The influence of key parameters of the damping isolation system on the vibration suppression of the

  13. Damage detection accuracy as a function of model uncertainty in offshore jacket platforms

    SciTech Connect

    Kim, J.T. [National Fisheries Univ. of Pusan (Korea, Republic of). Dept. of Ocean Engineering; Stubbs, N. [Texas A and M Univ., College Station, TX (United States). Dept. of Civil Engineering

    1995-12-31

    The impact of model uncertainty on the accuracy of a nondestructive damage detection technique when applied to an offshore jacket platform is assessed. First, a nondestructive algorithm to locate and size damage from a few mode shapes of structures is outlined. Next, numerical damage localization and severity estimation exercises are performed for an example of an offshore jacket platform. Finally, the accuracy of damage localization and severity estimation results in the numerical example is assessed as a function of model uncertainties for the structure.

  14. A robust damage detection method developed for offshore jacket platforms using modified artificial immune system algorithm

    NASA Astrophysics Data System (ADS)

    Mojtahedi, A.; Lotfollahi Yaghin, M. A.; Hassanzadeh, Y.; Abbasidoust, F.; Ettefagh, M. M.; Aminfar, M. H.

    2012-09-01

    Steel jacket-type platforms are the common kind of the offshore structures and health monitoring is an important issue in their safety assessment. In the present study, a new damage detection method is adopted for this kind of structures and inspected experimentally by use of a laboratory model. The method is investigated for developing the robust damage detection technique which is less sensitive to both measurement and analytical model uncertainties. For this purpose, incorporation of the artificial immune system with weighted attributes (AISWA) method into finite element (FE) model updating is proposed and compared with other methods for exploring its effectiveness in damage identification. Based on mimicking immune recognition, noise simulation and attributes weighting, the method offers important advantages and has high success rates. Therefore, it is proposed as a suitable method for the detection of the failures in the large civil engineering structures with complicated structural geometry, such as the considered case study.

  15. A Probabilistic Deformation Demand Model and Fragility Estimates for Asymmetric Offshore Jacket Platforms 

    E-print Network

    Fallon, Michael Brooks

    2012-11-12

    A PROBABILISTIC DEFORMATION DEMAND MODEL AND FRAGILITY ESTIMATES FOR ASYMMETRIC OFFSHORE JACKET PLATFORMS A Thesis by MICHAEL BROOKS FALLON Submitted to the Office of Graduate Studies of Texas A&M University in partial... ........................................................................ 28? 2.6.3? Deformation Demand Model ........................................................................ 32? 2.6.4? Model Assessment ........................................................................................ 32? 3. FRAGILITY...

  16. Differentiating between underwater construction noise of monopile and jacket foundations for offshore windmills: a case study from the Belgian part of the North Sea.

    PubMed

    Norro, Alain Michel Jules; Rumes, Bob; Degraer, Steven Johan

    2013-01-01

    Steel monopiles, jackets requiring four steel pinpiles, and gravity-based foundations were applied in offshore wind farms in the Belgian part of the North Sea. This paper compares the underwater noise generated during the piling activities of steel monopiles at the Belwind wind farm (Blighbank) with that of jacket pinpiles at the C-Power project (Thorntonbank). Underwater noise was measured at various distances from the pile driving location. The underwater noise was quantified by its zero to peak sound pressure level (L(z-p)), unweighted sound exposure level (SEL), cumulative SEL, and 1/3 octave spectra. No significant differences in L(z-p) could be demonstrated (monopile L(z-p): 179-194?dB? re 1? ?Pa, jacket L(z-p): 172-189?dB? re 1? ?Pa). SEL showed no statistical difference between monopile and jacket and varied between 145 and 168?dB? re 1? ?Pa(2)s. Furthermore, near identical spectra were measured for both types of piling. Piling of the jacket pinpiles took, however, about 2.5 times the time of the monopile. When standardised to megawatt installed per foundation both types of piling scored near equally. As an illustration, the radius of major behavioural disturbance (L(p-p) = 155?dB? re 1? ?Pa) in the harbour porpoise Phocoena phocoena was estimated by a model at 16?km for monopiles and at 8?km for jacket. PMID:23576910

  17. Differentiating between Underwater Construction Noise of Monopile and Jacket Foundations for Offshore Windmills: A Case Study from the Belgian Part of the North Sea

    PubMed Central

    Norro, Alain Michel Jules; Rumes, Bob; Degraer, Steven Johan

    2013-01-01

    Steel monopiles, jackets requiring four steel pinpiles, and gravity-based foundations were applied in offshore wind farms in the Belgian part of the North Sea. This paper compares the underwater noise generated during the piling activities of steel monopiles at the Belwind wind farm (Blighbank) with that of jacket pinpiles at the C-Power project (Thorntonbank). Underwater noise was measured at various distances from the pile driving location. The underwater noise was quantified by its zero to peak sound pressure level (Lz?p), unweighted sound exposure level (SEL), cumulative SEL, and 1/3 octave spectra. No significant differences in Lz?p could be demonstrated (monopile Lz?p: 179–194?dB?re 1??Pa, jacket Lz?p: 172–189?dB?re 1??Pa). SEL showed no statistical difference between monopile and jacket and varied between 145 and 168?dB?re 1??Pa2s. Furthermore, near identical spectra were measured for both types of piling. Piling of the jacket pinpiles took, however, about 2.5 times the time of the monopile. When standardised to megawatt installed per foundation both types of piling scored near equally. As an illustration, the radius of major behavioural disturbance (Lp?p = 155?dB?re 1??Pa) in the harbour porpoise Phocoena phocoena was estimated by a model at 16?km for monopiles and at 8?km for jacket. PMID:23576910

  18. Damage detection of offshore jacket structures using frequency domain selective measurements

    NASA Astrophysics Data System (ADS)

    Kianian, M.; Golafshani, A. A.; Ghodrati, E.

    2013-06-01

    The development of damage detection techniques for offshore jacket structures is vital to prevent catastrophic events. This paper applies a frequency response based method for the purpose of structural health monitoring. In efforts to fulfill this task, concept of the minimum rank perturbation theory has been utilized. The present article introduces a promising methodology to select frequency points effectively. To achieve this goal, modal strain energy ratio of each member was evaluated at different natural frequencies of structure in order to identify the sensitive frequency domain for damage detection. The proposed methodology opens up the possibility of much greater detection efficiency. In addition, the performance of the proposed method was evaluated in relation to multiple damages. The aforementioned points are illustrated using the numerical study of a two dimensional jacket platform, and the results proved to be satisfactory utilizing the proposed methodology.

  19. The role of redundancy in jacket-type offshore platforms 

    E-print Network

    Womble, J'nina Elaine

    1988-01-01

    the structure without causing the structure to become unstable. A stable structure does 32 not have a singular stiffness matrix. Therefore a redundant member is a member that can be removed from the system without causing the structural stiffness matrix.... The reliability of a structure is influenced by its ability to redistribute and carry load after the failure of a component or components. The reliability of the structure, in fact, increases as the ability to redis- tribute load increases. The ability...

  20. Jacketed lamp bulb envelope

    DOEpatents

    MacLennan, Donald A. (Gaithersburg, MD); Turner, Brian P. (Damascus, MD); Gitsevich, Aleksandr (Gaithersburg, MD); Bass, Gary K. (Mt. Airy, MD); Dolan, James T. (Frederick, MD); Kipling, Kent (Gaithersburg, MD); Kirkpatrick, Douglas A. (Great Falls, VA); Leng, Yongzhang (Damascus, MD); Levin, Izrail (Silver Spring, MD); Roy, Robert J. (Frederick, MD); Shanks, Bruce (Gaithersburg, MD); Smith, Malcolm (Alexandria, VA); Trimble, William C. (Columbia, MD); Tsai, Peter (Olney, MD)

    2001-01-01

    A jacketed lamp bulb envelope includes a ceramic cup having an open end and a partially closed end, the partially closed end defining an aperture, a lamp bulb positioned inside the ceramic cup abutting the aperture, and a reflective ceramic material at least partially covering a portion of the bulb not abutting the aperture. The reflective ceramic material may substantially fill an interior volume of the ceramic cup not occupied by the bulb. The ceramic cup may include a structural feature for aiding in alignment of the jacketed lamp bulb envelope in a lamp. The ceramic cup may include an external flange about a periphery thereof. One example of a jacketed lamp bulb envelope includes a ceramic cup having an open end and a closed end, a ceramic washer covering the open end of the ceramic cup, the washer defining an aperture therethrough, a lamp bulb positioned inside the ceramic cup abutting the aperture, and a reflective ceramic material filling an interior volume of the ceramic cup not occupied by the bulb. A method of packing a jacketed lamp bulb envelope of the type comprising a ceramic cup with a lamp bulb disposed therein includes the steps of filling the ceramic cup with a flowable slurry of reflective material, and applying centrifugal force to the cup to pack the reflective material therein.

  1. Nonlinear stochastic optimal control of offshore platforms under wave loading

    Microsoft Academic Search

    M. Luo; W. Q. Zhu

    2006-01-01

    A nonlinear stochastic optimal (NSO) control strategy for wave-excited jacket-type offshore platforms is proposed. Wave force is determined according to linearized Morison equation. Spectral density functions of water particle velocity and acceleration are approximated by some rational forms, respectively. Wave force vector is then treated as output of a linear filter driven by white noise. A set of partially averaged

  2. Variable pressure thermal insulating jacket

    DOEpatents

    Nelson, Paul A. (Wheaton, IL); Malecha, Richard F. (Naperville, IL); Chilenskas, Albert A. (Chicago, IL)

    1994-01-01

    A device for controlled insulation of a thermal device. The device includes a thermal jacket with a closed volume able to be evacuated to form an insulating jacket around the thermal source. A getter material is in communcation with the closed volume of the thermal jacket. The getter material can absorb and desorb a control gas to control gas pressure in the volume of the thermal jacket to control thermal conductivity in the thermal jacket.

  3. Variable pressure thermal insulating jacket

    DOEpatents

    Nelson, P.A.; Malecha, R.F.; Chilenskas, A.A.

    1994-09-20

    A device for controlled insulation of a thermal device is disclosed. The device includes a thermal jacket with a closed volume able to be evacuated to form an insulating jacket around the thermal source. A getter material is in communication with the closed volume of the thermal jacket. The getter material can absorb and desorb a control gas to control gas pressure in the volume of the thermal jacket to control thermal conductivity in the thermal jacket. 10 figs.

  4. Reliability of Jackets: BeyondStaticCapacity D. G. Schmucker 1 and C. A. Cornell 2

    E-print Network

    Sweetman, Bert

    A robust, explicit expression of the failure probability of an offshore structure under extreme wave loads, for instance) of considering the beyond­ static­capacity response of jacket platforms. For structures for offshore structures responding to the ``quasi­static'' extreme wave environment include the static ulti

  5. 46 CFR 117.71 - Life jackets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Shipping 4 2014-10-01 2014-10-01 false Life jackets. 117.71 Section 117.71 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.71 Life jackets. (a) An...

  6. 46 CFR 117.71 - Life jackets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Shipping 4 2012-10-01 2012-10-01 false Life jackets. 117.71 Section 117.71 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.71 Life jackets. (a) An...

  7. 46 CFR 117.71 - Life jackets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Shipping 4 2013-10-01 2013-10-01 false Life jackets. 117.71 Section 117.71 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.71 Life jackets. (a) An...

  8. Life Jacket Policy Study 15 Jan 2012

    E-print Network

    US Army Corps of Engineers

    Life Jacket Policy Study 15 Jan 2012 #12;2 TABLE OF CONTENTS I. INTRODUCTION.........................................................................18 APPENDICES: A...........................LIFE JACKET MANDATE STUDY INTERIM REPORT B...........................RESERVED G...........................LIFE JACKET LOANER PROGRAM GUIDELINES H

  9. 46 CFR 117.71 - Life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Shipping 4 2011-10-01 2011-10-01 false Life jackets. 117.71 Section 117.71 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.71 Life jackets. (a) An...

  10. Plating Patches On Heat-Exchanger Jackets

    NASA Technical Reports Server (NTRS)

    Loureiro, Henry; Kubik, Frank

    1989-01-01

    Permanent repairs made without welding. Technique used to repair nickel-alloy nozzle jacket of Space Shuttle main engine. Applicable to other metal heat-exchanger jackets with similar configurations. Does not require welding, brazing, soldering, or other operations involving high temperatures and consequent damage to surrounding areas. Portion of jacket around damaged area removed by grinding and polishing out to edges adjacent to tube/jacket braze bonds. Spaces between tubes filled with wax preventing contamination of spaces during subsequent plating.

  11. The Seismic Reliability of Offshore Structures Based on Nonlinear Time History Analyses

    SciTech Connect

    Hosseini, Mahmood [Associate Professor, Civil Engineering Department, Graduate School, Tehran South Branch of the Islamic Azad University (IAU), Jamalzadeh St., Keshsavarz Blvd, Tehran 14187 (Iran, Islamic Republic of); Karimiyani, Somayyeh [Graduate Student, Civil Engineering Department, Graduate School, Tehran South Branch of the Islamic Azad University (IAU), Jamalzadeh St., Keshsavarz Blvd, Tehran 14187 (Iran, Islamic Republic of); Ghafooripour, Amin [Assistant Professor, Civil Engineering Department, Tehran Central Branch of the Islamic Azad University (IAU), Tehran (Iran, Islamic Republic of); Jabbarzadeh, Mohammad Javad [PhD Student, Graduate Program, International Institute of Earthquake Engineering and Seismology (IIEES), P.O. Box 19395/3913, Tehran (Iran, Islamic Republic of)

    2008-07-08

    Regarding the past earthquakes damages to offshore structures, as vital structures in the oil and gas industries, it is important that their seismic design is performed by very high reliability. Accepting the Nonlinear Time History Analyses (NLTHA) as the most reliable seismic analysis method, in this paper an offshore platform of jacket type with the height of 304 feet, having a deck of 96 feet by 94 feet, and weighing 290 million pounds has been studied. At first, some Push-Over Analyses (POA) have been preformed to recognize the more critical members of the jacket, based on the range of their plastic deformations. Then NLTHA have been performed by using the 3-components accelerograms of 100 earthquakes, covering a wide range of frequency content, and normalized to three Peak Ground Acceleration (PGA) levels of 0.3 g, 0.65 g, and 1.0 g. By using the results of NLTHA the damage and rupture probabilities of critical member have been studied to assess the reliability of the jacket structure. Regarding that different structural members of the jacket have different effects on the stability of the platform, an 'importance factor' has been considered for each critical member based on its location and orientation in the structure, and then the reliability of the whole structure has been obtained by combining the reliability of the critical members, each having its specific importance factor.

  12. Life Jacket Mandate Study Interim Report

    E-print Network

    US Army Corps of Engineers

    Life Jacket Mandate Study Interim Report 2 May 2008 #12;TABLE OF CONTENTS I. INTRODUCTION............................................................................................18 XI. LIFE JACKET STUDY PRODUCT DELIVERY TEAM (PDT) PARTICIPANTS..19 2 #12;I. INTRODUCTION. A Life 327 that would require members of the public to wear a life jacket while recreating on Corps waters

  13. Cartridge getter for vacuum jacketing

    NASA Technical Reports Server (NTRS)

    Luebbers, C. J.

    1977-01-01

    Inexpensively-manufactured getter cartridge save users time in vacuum system maintenance and allows almost anyone to carry out replacement procedure that formerly required skilled welder. Cartridge screws into port in outer wall of vacuum jacket. Getter is replaced by simply unscrewing cartridge rather than cutting and rewelding.

  14. Reliability analysis of offshore structures under extreme environmental loading

    SciTech Connect

    Crohas, H.; Barn; Hachemi-Safai, V.; Tai, A.A.

    1984-05-01

    A method for the evaluation of the collapse probability under extreme loads is proposed for jacket-type offshore platforms. Following the generation of the dominant modes of structural failure, each is assigned an occurrence probability. The failure probability of the structural members at each stage of damage is calculated with taking into account the correlations between the types of environmental actions and between the member internal forces. The strength of the structural members is evaluated according to three limit state criteria: biaxial bending plastification, buckling and punching shear.

  15. Hydroelastic responses of pontoon type very large floating offshore structure

    SciTech Connect

    Haeda, Hisaaki; Miyajima, Shyogo [Univ. of Tokyo (Japan). Inst. of Industrial Science; Masuda, Koich; Ikoma, Tomoki [Nihon Univ., Funabashi, Chiba (Japan)

    1996-12-31

    The authors developed the estimating method of the hydroelastic response of a very large pontoon type floating structure. In this method, the pressure distribution method with shallow draft assumption was used to obtain the hydrodynamic forces considering the elastic motion of a floating body. The elastic responses of very large floating structure were estimated by using 1-D beam modeling. On the other hand, to observe the elastic response of a large pontoon type structure they carried out experiments in head sea and head-beam sea conditions. The experimental model was an elastic model of pontoon type large floating body. To validate numerical estimation method the authors compared the numerical results with experimental results. From these results, they found good agreement and confirmed the accuracy of this numerical estimation method of the hydroelasticity of a very large pontoon type floating structure.

  16. Advanced Offshore Oil Platforms

    Microsoft Academic Search

    Fred S. Ellers

    1982-01-01

    Four innovative offshore platforms that are designed to withstand 100-foot waves in waters 600-feet deep are described. These platforms are: (1) Stratfjord B Concrete Gravity-Base Platform; (2) Magnus Steel-Template-Jacket Platform; (3) Hutton Tension-Leg Platform; and (4) Block 280 Guyed Tower. The Statfjord B platform, designed in Norway, rests on four massive concrete columns with storage tanks at the base. It

  17. 46 CFR 117.78 - Stowage of life jackets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Stowage of life jackets. 117.78 Section 117.78 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.78 Stowage of life jackets....

  18. 46 CFR 180.75 - Life jacket lights.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Shipping 7 2013-10-01 2013-10-01 false Life jacket lights. 180.75 Section 180.75 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.75 Life jacket lights....

  19. 46 CFR 180.75 - Life jacket lights.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

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  20. 46 CFR 117.75 - Life jacket lights.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Shipping 4 2013-10-01 2013-10-01 false Life jacket lights. 117.75 Section 117.75 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.75 Life jacket lights....

  1. 46 CFR 180.78 - Stowage of life jackets.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 2012-10-01 false Stowage of life jackets. 180.78 Section 180.78 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.78 Stowage of life jackets....

  2. 46 CFR 180.75 - Life jacket lights.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Shipping 7 2014-10-01 2014-10-01 false Life jacket lights. 180.75 Section 180.75 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.75 Life jacket lights....

  3. 46 CFR 180.78 - Stowage of life jackets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Stowage of life jackets. 180.78 Section 180.78 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.78 Stowage of life jackets....

  4. 46 CFR 180.78 - Stowage of life jackets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Stowage of life jackets. 180.78 Section 180.78 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.78 Stowage of life jackets....

  5. 46 CFR 117.78 - Stowage of life jackets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 2014-10-01 false Stowage of life jackets. 117.78 Section 117.78 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.78 Stowage of life jackets....

  6. 46 CFR 117.78 - Stowage of life jackets.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 2013-10-01 false Stowage of life jackets. 117.78 Section 117.78 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.78 Stowage of life jackets....

  7. 46 CFR 117.75 - Life jacket lights.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...Shipping 4 2014-10-01 2014-10-01 false Life jacket lights. 117.75 Section 117.75 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.75 Life jacket lights....

  8. 46 CFR 117.75 - Life jacket lights.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Shipping 4 2012-10-01 2012-10-01 false Life jacket lights. 117.75 Section 117.75 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.75 Life jacket lights....

  9. 46 CFR 180.75 - Life jacket lights.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Shipping 7 2010-10-01 2010-10-01 false Life jacket lights. 180.75 Section 180.75 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.75 Life jacket lights....

  10. 46 CFR 180.78 - Stowage of life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Stowage of life jackets. 180.78 Section 180.78 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.78 Stowage of life jackets....

  11. 46 CFR 117.75 - Life jacket lights.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Shipping 4 2010-10-01 2010-10-01 false Life jacket lights. 117.75 Section 117.75 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.75 Life jacket lights....

  12. 46 CFR 117.75 - Life jacket lights.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Shipping 4 2011-10-01 2011-10-01 false Life jacket lights. 117.75 Section 117.75 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.75 Life jacket lights....

  13. 46 CFR 180.75 - Life jacket lights.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Shipping 7 2011-10-01 2011-10-01 false Life jacket lights. 180.75 Section 180.75 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.75 Life jacket lights....

  14. 46 CFR 117.78 - Stowage of life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 2011-10-01 false Stowage of life jackets. 117.78 Section 117.78 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.78 Stowage of life jackets....

  15. Results from large scale ultimate strength tests of K-braced jacket frame structures

    SciTech Connect

    Bolt, H.M.

    1995-12-01

    Phase 2 of the JIP Frames Project included four large scale collapse tests of K-braced frames in which both gap and overlap K joints were the critical components. The results are presented in this paper. The local failure modes differed from typical isolated component tests, yet were representative of structural damage observed following Hurricane Andrew. The frame test results therefore provide important insight to the ultimate response of offshore jacket structures.

  16. Proceedings of the 21st annual offshore technology conference. Volume 1

    SciTech Connect

    Not Available

    1989-01-01

    This book contains the proceedings of a conference on offshore technology. Topics covered include: underwater wet welding of higher strength offshore steels; the proposed extended-reach drilling project; North Sea experience with aluminum drillpipe; and load transfer mechanism to offshore jackets during pile driving.

  17. Shorting pipeline and jacket cathodic protection systems

    SciTech Connect

    Thomason, W.H. (Conoco Inc., Ponca City, OK (United States)); Evans, S. (Conoco Inc., Houston, TX (United States)); Rippon, I.J. (Conoco Ltd., Aberdeen (United Kingdom)); Maurin, A.E. III (Conoco Inc., Lafayette, LA (United States))

    1993-09-01

    The benefits of shorting pipeline and jacket cathodic protection (CP) systems for the external protection of subsea pipelines based on data from operations in the Gulf of Mexico, Persian Gulf, North Sea, and Indonesia are discussed. Shorting, as opposed to traditional electrical isolation, is cost effective because CP surveys and future retrofits are greatly simplified. Jacket CP systems can provide protection of coated pipelines for distances much greater than normally anticipated. Some simple modeling of jacket/pipeline CP systems is used to illustrate the effect of various design parameters.

  18. Satellite-acoustic positioning aids jacket installations

    SciTech Connect

    Not Available

    1984-08-01

    Correct bottom positioning of jackets and templates is important, not only for reasons of permanency, but because many fields are located near international boundaries. The accurate positioning of platform jackets and templates on the seabed is accompanied by orienting a set of sealed transponders to known seabed features or through the assistance of satellite position fixing where no known features exist. The satellite-acoustic positioning system is described.

  19. Shift type and season affect adaptation of the 6-sulphatoxymelatonin rhythm in offshore oil rig workers.

    PubMed

    Barnes, R G; Forbes, M J; Arendt, J

    1998-08-21

    Previously we have shown that the 6-sulphatoxymelatonin rhythm of oil rig workers on a 2-week night shift (1800-0600 h) adapts to the shift via a phase delay. We now report the findings of a study on two offshore drill crews working a 1 week day (1200-0000 h), 1 week night (0000-1200 h) swing shift. Urine samples were collected every 2-3 h throughout the subjective days, with over-sleep collections, for the measurement of 6-sulphatoxymelatonin by radioimmunoassay. One crew (n = 11), studied in November, showed no change in their 6-sulphatoxymelatonin rhythm during night shift. The other crew (n = 7), studied in March, showed a significant phase advance of the rhythm during night shift. The data indicate that both the type of shift and the season influence the direction and degree of adaptation. PMID:9739990

  20. Leak locator for vacuum jacketed pipelines eliminates need for removal of outer jacket

    NASA Technical Reports Server (NTRS)

    Wells, G. H.

    1966-01-01

    Device for locating leaks in a vacuum-jacketed liquid-hydrogen transfer line consists of two Mylar discs, a source of nitrogen and helium gas, and a mass spectrometer. The outer jacket of the pipeline does not need to be removed for the locator to be used.

  1. The suction mooring, a new type of offshore single point mooring

    SciTech Connect

    Korsgaard, J.; Hutter, L.

    1995-12-01

    Existing systems for mooring offshore oil production vessels of the ship type only permit the mooring or tying up of the vessel in quite low wave conditions. Virtually all existing systems do not permit the vessel to moor in wave conditions exceeding H{sub s} = 4.5 m. The wait for the waves to subside following the storm causes additional production losses due to the oil field being shut in. A newly developed mooring system, the suction mooring, promises to overcome this problem by permitting the mooring of the vessels in wave heights to at least H{sub s} = 8 m. The principle of the mooring consists of using the hydrostatic pressure available at the keel of the vessel to press a mooring buoy onto the bottom and holding the vessel by the resulting friction. The action of the mooring buoy is similar to that of a suction cup. The pressure above the buoy is lowered and maintained low by means of pumps aboard the vessel. This paper reports on model tests carried out to prove the feasibility of conducting the mooring operations in high waves. Three different configurations of the mooring buoy were tested. For two of the configurations it was found that the mooring process could be carried out safely in all wave heights tested i.e. up to H{sub s} = 7.7 m. The impact upon offshore operations of this capability was investigated by performing Monte Carlo simulations on a hypothetical oil field in the center North Sea and in the northern North Sea. An actual center North Sea wave record was used in the simulations. The suction mooring system was compared to two other high performance mooring systems. The results show that weather related oil field shut-ins are reduced an order of magnitude by application of the suction mooring compared to the other systems simulated.

  2. Jacketed cryogenic piping is stress relieved

    NASA Technical Reports Server (NTRS)

    Bowers, W. M.

    1967-01-01

    Jacketed design of piping used to transfer cryogenic fluids, relieves severe stresses associated with the temperature gradients that occur during transfer cycles and ambient periods. The inner /transfer/ pipe is preloaded in such a way that stress relief takes place automatically as cycling occurs.

  3. 46 CFR 117.71 - Life jackets.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...160.002, 160.005, or 160.055 in subchapter Q of this chapter, or other standard specified by the Commandant. (d) Cork and balsa wood life jackets previously approved in accordance with §§ 106.003, or 160.004 in subchapter Q of this...

  4. 46 CFR 180.71 - Life jackets.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...160.002, 160.005, or 160.055 in subchapter Q of this chapter, or other standard specified by the Commandant. (d) Cork and balsa wood life jackets previously approved in accordance with §§ 106.003, or 160.004 in subchapter Q of this...

  5. Feedback-feedforward control of offshore platforms under random waves

    Microsoft Academic Search

    J. Suhardjo; A. Kareem

    2001-01-01

    SUMMARY This study investigates the control of jacket-type oshore platforms. The deck displacement of jacket- type oshore platforms can be controlled using both passive and active control mechanisms. Among the passive control mechanisms, a tuned mass damper concept is studied in this paper. Active control mechanisms considered here include the active mass damper, the active tendon mechanism and the propeller

  6. Vacuum-jacketed hydrofluoric acid solution calorimeter

    USGS Publications Warehouse

    Robie, R.A.

    1965-01-01

    A vacuum-jacketed metal calorimeter for determining heats of solution in aqueous HF was constructed. The reaction vessel was made of copper and was heavily gold plated. The calorimeter has a cooling constant of 0.6 cal-deg -1-min-1, approximately 1/4 that of the air-jacketed calorimeters most commonly used with HF. It reaches equilibrium within 10 min after turning off the heater current. Measurements of the heat of solution of reagent grade KCl(-100 mesh dried 2 h at 200??C) at a mole ratio of 1 KCl to 200 H2O gave ??H = 4198??11 cal at 25??C. ?? 1965 The American Institute of Physics.

  7. ART-based multiple neural networks for monitoring offshore platforms

    Microsoft Academic Search

    Lalu Mangal; V. G. Idichandy; C. Ganapathy

    1996-01-01

    A novel scheme using artificial neural networks to automate the vibration monitoring method of detecting the occurrence and location of damage in offshore jacket platforms is presented. A multiple neural network system is adopted which enables the problem to be decomposed into smaller ones, facilitating easier solution. An adaptive resonance theory (ART) neural network is used for damage diagnosis and

  8. Tensile test of SS 316LN jacket with different conditions

    NASA Astrophysics Data System (ADS)

    Qin, Jinggang; Dai, Chao; Liao, Guojun; Wu, Yu; Zhu, Xiaofeng; Huang, Chuanjun; Li, Laifeng; wang, Kun; Shen, Xiaogang; Tu, Zhengpin; Ji, Hui

    2014-11-01

    316LN stainless steel is selected as a material for Toroidal-field (TF) conductor jacket of International Thermonuclear Experimental Reactor (ITER). When energized, the ITER TF coils experience large pulsed electromagnetic forces that the conductor jacket itself must withstand. The conductor will be compacted, spooled and aged at approximately 650 °C during manufacture. Therefore, the sample jackets were prepared under compaction, stretching and annealing to simulate the manufacturing process and operation of TF coils. The present Chinese TF jacket has good performance under standard conditions. In order to investigate more mechanical properties of 316LN jacket, the different cold working and annealing were applied to the raw materials. The samples were measured at 4.2 K, 77 K and 300 K. Youngs modulus, yield strength (0.2% offset), elongation at failure and SEM images are reported. There is no big deviation among different conditions. The test results show that Chinese TF jacket has good performance.

  9. 46 CFR 389.3 - Registration.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...launching or installation of offshore platform jackets; (2) Provide...for transportation of platform jackets when non-coastwise-qualified...operator of any type of offshore exploration, development...transportation of a platform jacket it must...

  10. 46 CFR 389.3 - Registration.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...launching or installation of offshore platform jackets; (2) Provide...for transportation of platform jackets when non-coastwise-qualified...operator of any type of offshore exploration, development...transportation of a platform jacket it must...

  11. 46 CFR 389.2 - Definitions.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...or installing an offshore drilling or production platform jacket, provided...240 pounds. Platform jacket refers to...includes any type of offshore exploration, development...thereof, including platform jackets,...

  12. 46 CFR 389.3 - Registration.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...launching or installation of offshore platform jackets; (2) Provide...for transportation of platform jackets when non-coastwise-qualified...operator of any type of offshore exploration, development...transportation of a platform jacket it must...

  13. 46 CFR 389.2 - Definitions.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...or installing an offshore drilling or production platform jacket, provided...240 pounds. Platform jacket refers to...includes any type of offshore exploration, development...thereof, including platform jackets,...

  14. 46 CFR 389.3 - Registration.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...launching or installation of offshore platform jackets; (2) Provide...for transportation of platform jackets when non-coastwise-qualified...operator of any type of offshore exploration, development...transportation of a platform jacket it must...

  15. 46 CFR 389.2 - Definitions.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...or installing an offshore drilling or production platform jacket, provided...240 pounds. Platform jacket refers to...includes any type of offshore exploration, development...thereof, including platform jackets,...

  16. Shift type and season affect adaptation of the 6-sulphatoxymelatonin rhythm in offshore oil rig workers

    Microsoft Academic Search

    R. G Barnes; M. J Forbes; J Arendt

    1998-01-01

    Previously we have shown that the 6-sulphatoxymelatonin rhythm of oil rig workers on a 2-week night shift (1800–0600 h) adapts to the shift via a phase delay. We now report the findings of a study on two offshore drill crews working a 1 week day (1200–0000 h), 1 week night (0000–1200 h) swing shift. Urine samples were collected every 2–3

  17. 3D FEM analysis on bearing capacity behaviors of tri-piles foundation for offshore wind turbines

    Microsoft Academic Search

    Xiao-wei Tangi; Bing-xue Liu; Qi Shao

    2011-01-01

    With the development of wind power generation technology, offshore wind power generation plays a major role for developing renewable sources in the world today. According to the proposed Hangzhou Bay wind farm, based on general-purpose finite element software, bearing capacity of the jacket foundation for offshore wind turbine has been simulated by the three - dimensional finite element numerical method.

  18. Earthquake resistant design of offshore building structures

    Microsoft Academic Search

    M. Ozaki; S. Hayashi

    1978-01-01

    A proposed earthquake resistant design system for offshore building structures in Japan is introduced. Offshore building structures are defined as the fixed type offshore structures which are constantly utilized for the purpose of habitation, duty, work, operation, gathering, recreation, sightseeing, etc. In the first section, basic principles for the design of offshore building structures are introduced considering safety of human

  19. Ported jacket for use in deformation measurement apparatus

    DOEpatents

    Wagner, Leslie A. (Rapid City, SD); Senseny, Paul E. (Rapid City, SD); Mellegard, Kirby D. (Rapid City, SD); Olsberg, Steven B. (Rapid City, SD)

    1990-01-01

    A device for allowing deformation measurement of a jacketed specimen when the specimen is loaded includes an elastomeric specimen container or jacket surrounding a specimen while the specimen is being loaded by a test apparatus. The specimen jacket wall is compressible, and the wall follows and allows deformation of the specimen. The jacket wall of compressible material is provided with at least one opening and a thin layer or shim of substantially non-compressible (metal) material covers and seals this opening. An extensometer is then positioned with its specimen engaging contact members engaging the substantially non-compressible material to measure the deformation of the specimen when the specimen is loaded, without compressibility effects of the jacket.

  20. Lightweight Vacuum Jacket for Cryogenic Insulation. Volume 1

    NASA Technical Reports Server (NTRS)

    Barclay, D. L.; Bell, J. E.; Brogren, E. W.; Straayer, J. W.

    1975-01-01

    The feasibility of producing a lightweight vacuum jacket using state-of-the-art technology and materials was examined. Design and analytical studies were made on a full-scale, orbital maneuvering system fuel tank. Preliminary design details were made for the tank assembly, including an optimized vacuum jacket and multilayer insulation system. A half-scale LH2 test model was designed and fabricated, and a force/stiffness proof test was conducted on the vacuum jacket. A vacuum leak rate of .000001 atmosphere ml of helium per second was measured, approximately 1500 hours of vacuum pressure were sustained, and 29 vacuum-pressure cycles were experienced prior to failure.

  1. Technique cuts time and cost of bending jacketed piping

    NASA Technical Reports Server (NTRS)

    Gardner, J. N.

    1967-01-01

    Technique uses a stiff medium in the annular space between inner and outer pipes of jacketed piping in transfer lines. The process eliminates splitting and welding and makes possible the use of standard pipe-bending tools.

  2. Optical fiber magnetic field sensors with ceramic magnetostrictive jackets.

    PubMed

    Sedlar, M; Paulicka, I; Sayer, M

    1996-09-20

    Optical fibers coated by magnetostrictive ceramic films were tested with a Mach-Zehnder interferometer in an open-loop mode. The sensors exhibited excellent linearity and good sensitivity. The response of ceramic-jacketed fibers was not affected by small dc fluctuations that are due to the linear behavior of tested ceramic coatings in low magnetic fields. Tested ceramic materials included magnetite, ?-Fe(2) O(3), nickel ferrite, and cobalt-doped nickel ferrite (NCF2) jackets. The latter showed the best performance. A minimum detectable field of 3.2 × 10(-3) A/m for optical fiber jacketed with 2-?m-thick and 1-m-long NCF2 material has been achieved. The capability of detecting magnetic fields as low as 2.6 × 10(-7) A/m with a 10-?m-thick cobalt-doped nickel ferrite jacket is proposed. PMID:21127528

  3. Organizational aspects of engineering system safety: the case of offshore platforms.

    PubMed

    Paté-Cornell, M E

    1990-11-30

    Organizational errors are often at the root of failures of critical engineering systems. Yet, when searching for risk management strategies, engineers tend to focus on technical solutions, in part because of the way risks and failures are analyzed. Probabilistic risk analysis allows assessment of the safety of a complex system by relating its failure probability to the performance of its components and operators. In this article, some organizational aspects are introduced to this analysis in an effort to describe the link between the probability of component failures and relevant features of the organizaton. Probabilities are used to analyze occurrences of organizational errors and their effects on system safety. Coarse estimates of the benefits of certain organizational improvements can then be derived. For jacket-type offshore platforms, improving the design review can provide substantial reliability gains, and the corresponding expense is about two orders of magnitude below the cost of achieving the same result by adding steel to structures. PMID:17829207

  4. Environmental effects on a structurally dense jacket platform model

    SciTech Connect

    Chakrabarti, S.K. [CBI Technical Services Co., Plainfield, IL (United States); Gu, G.Z. [Mobil Technology Co., Dallas, TX (United States)

    1996-12-31

    The wave loading due to high storm waves is an important consideration in the re-qualification and upgrading of older Gulf of Mexico jackets. In particular, due to dense population of members in these jackets, blockage and shielding are important parameters. Experiments in regular waves and uniform current showed that the presence of current in waves substantially increases the blockage effect from these members. API-RP2A recommendation for blockage factor in current matches the test data well.

  5. Turbulator for a liner cooling jacket

    NASA Technical Reports Server (NTRS)

    Hoag, Kevin L. (Inventor)

    1995-01-01

    A turbulator for a liner cooling jacket includes a metal panel which is suitable to be coiled into a generally cylindrical shape so as to be placed in a relief area between an engine cylinder block and a cylinder liner. The relief area may be machined into either the block or the cylinder liner and the metal panel is formed with a pattern of protuberances shaped like corrugations. In one embodiment, the corrugations have a shape similar to a sine wave and are arranged in a plurality of generally parallel axial segments. The corrugation wave pattern of one segment may be the same as its adjacent segment or may be staggered by one corrugation which would mean one-half of a full wave cycle. The corrugation pattern in the turbulator panel may be created by any one of various stamping or forming operations and when placed between the cylinder liner and block, increases turbulence of the cooling liquid in order to enhance heat transfer.

  6. Offshore Technology

    NSDL National Science Digital Library

    Offshore Technology is a Web site specifically geared for the offshore oil and gas industry. The highlight of the site is the Industry Projects link, which gives information about offshore drilling projects from around the world. Sites are categorized geographically and include description of the project, information on the geology of the area, drilling history of the site, wellhead platform, pipeline information, and much more. Other links on the main page include an A to Z listing of contractors and suppliers, exhibition and conference information, and other helpful resources for the offshore drilling professional and researcher.

  7. Tribology offshore

    SciTech Connect

    Not Available

    1985-01-01

    The papers presented in this book deal with the performance and reliability of plant and materials in offshore engineering operations. The rigours of the North Sea environment have proved to be particularly strenuous for offshore equipment. The lessons learned in the last few years of exploration are relevant to offshore sites throughout the world. The topics covered include lifting gear, compressors, pumps, valves and seals, lubricants and lubrication, underwater equipment, friction and wear associated with the anchorage of rigs and platforms, sliding contract and condition monitoring offshore.

  8. Evaluation of damage to offshore platform structures due to collision of large barge

    Microsoft Academic Search

    Wei-liang Jin; Jian Song; Shun-feng Gong; Yong Lu

    2005-01-01

    An offshore jacket platform in the South China Sea was impacted by a large derrick and lay barge during installation. This paper presents a non-linear dynamical analysis procedure for firstly determining the impact action based on the forensic evidence from the damaged components, and then evaluating the overall damage effects on the platform structure. The impact action of the barge

  9. Response of a steel-jacket platform subject to measured seafloor seismic ground motions

    SciTech Connect

    Smith, C.E.

    1996-12-31

    Seismic analyses of offshore platforms may be accomplished using classical finite element techniques with the input forcing function modeled for earthquake loadings. The significant difference between an offshore structure and an onshore structure is that the analysis procedure must be modified to consider the fluid-structure and the soil-pile interaction effects. Current practices (1996) use earthquake forcing functions obtained or modified from ground accelerations measured in the vertical and horizontal directions recorded from onshore sites. However, recent research has suggested that the ground motions measured on the seafloor may differ from ground motions measured from onshore sites during an earthquake. This paper will compare the response of a typical mid-water depth offshore platform subject to both onshore and offshore recorded ground motions from the same earthquake. Recommendations are put forth for the type of seismic forcing function to be used in the design or requalification of offshore structures, as well as relevant research for the future.

  10. Discrimination of bullet types using analysis of lead isotopes deposited in gunshot entry wounds.

    PubMed

    Wunnapuk, Klintean; Minami, Takeshi; Durongkadech, Piya; Tohno, Setsuko; Ruangyuttikarn, Werawan; Moriwake, Yumi; Vichairat, Karnda; Sribanditmongkol, Pongruk; Tohno, Yoshiyuki

    2009-01-01

    In order to discriminate bullet types used in firearms, of which the victims died, the authors investigated lead isotope ratios in gunshot entry wounds from nine lead (unjacketed) bullets, 15 semi-jacketed bullets, and 14 full-jacketed bullets by inductively coupled plasma-mass spectrometry. It was found that the lead isotope ratio of 207/206 in gunshot entry wounds was the highest with lead bullets, and it decreased in order from full-jacketed to semi-jacketed bullets. Lead isotope ratios of 208/206 or 208/207 to 207/206 at the gunshot entry wound were able to discriminate semi-jacketed bullets from lead and full-jacketed ones, but it was difficult to discriminate between lead and full-jacketed bullets. However, a combination of element and lead isotope ratio analyses in gunshot entry wounds enabled discrimination between lead, semi-jacketed, and full-jacketed bullets. PMID:19129983

  11. Calibration and Validation of a Spar-Type Floating Offshore Wind Turbine Model using the FAST Dynamic Simulation Tool: Preprint

    SciTech Connect

    Browning, J. R.; Jonkman, J.; Robertson, A.; Goupee, A. J.

    2012-11-01

    In 2007, the FAST wind turbine simulation tool, developed and maintained by the U.S. Department of Energy's (DOE's) National Renewable Energy Laboratory (NREL), was expanded to include capabilities that are suitable for modeling floating offshore wind turbines. In an effort to validate FAST and other offshore wind energy modeling tools, DOE funded the DeepCwind project that tested three prototype floating wind turbines at 1/50th scale in a wave basin, including a semisubmersible, a tension-leg platform, and a spar buoy. This paper describes the use of the results of the spar wave basin tests to calibrate and validate the FAST offshore floating simulation tool, and presents some initial results of simulated dynamic responses of the spar to several combinations of wind and sea states.

  12. 46 CFR 180.72 - Personal flotation devices carried in addition to life jackets.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... Personal flotation devices carried in addition to life jackets. 180.72 Section 180.72 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.72 Personal flotation devices...

  13. 46 CFR 117.72 - Personal flotation devices carried in addition to life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Personal flotation devices carried in addition to life jackets. 117.72 Section 117.72 Shipping...PASSENGERS LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 117.72 Personal flotation devices...

  14. 46 CFR 180.72 - Personal flotation devices carried in addition to life jackets.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... Personal flotation devices carried in addition to life jackets. 180.72 Section 180.72 Shipping...TONS) LIFESAVING EQUIPMENT AND ARRANGEMENTS Ring Life Buoys and Life Jackets § 180.72 Personal flotation devices...

  15. Development, analysis and design of a 292 ft tall self-erecting flare tower for offshore application

    SciTech Connect

    Desai, V.; Srinivasan, N. [Dreco, Houston, TX (United States)

    1995-12-31

    This paper describes the development of a 292 ft tall flare tower applicable for large offshore production facilities. First of its kind in a flare tower design, an innovative but well proven self-erecting technique is used. The technique aimed eliminating the transportation and erection costs. The structural concept is known as Self-Erecting Flare Tower (SEFT). In SEFT concept, the tower is segmented into a number of small manageable sections. A jacket type bottom section is used to support telescoping the tower sections. The design erection procedure, technical and functional feasibility of SEFT concept are discussed. At the end of this paper, a cost comparison study with conventional flare tower is given.

  16. Properties of stainless steels for fusion conductor jackets and their manufacturing techniques

    Microsoft Academic Search

    S. Forster; P. Komarek; A. Nyilas; A. Ulbricht

    1992-01-01

    A superconducting cable for a fusion magnet has to be reinforced by a stainless steel jacket which envelops the cable. The jackets are fabricated by extruded and butt welded steel sections or by composing the jacket from drawn sections with longitudinal welds. Fatigue life and fatigue crack growth rates (FCGRs) were investigated at 10 K for embedded and surface cracks

  17. Towers for Offshore Wind Turbines

    NASA Astrophysics Data System (ADS)

    Kurian, V. J.; Narayanan, S. P.; Ganapathy, C.

    2010-06-01

    Increasing energy demand coupled with pollution free production of energy has found a viable solution in wind energy. Land based windmills have been utilized for power generation for more than two thousand years. In modern times wind generated power has become popular in many countries. Offshore wind turbines are being used in a number of countries to tap the energy from wind over the oceans and convert to electric energy. The advantages of offshore wind turbines as compared to land are that offshore winds flow at higher speed than onshore winds and the more available space. In some land based settings, for better efficiency, turbines are separated as much as 10 rotor diameters from each other. In offshore applications where only two wind directions are likely to predominate, the distances between the turbines arranged in a line can be shortened to as little as two or four rotor diameters. Today, more than a dozen offshore European wind facilities with turbine ratings of 450 kw to 3.6 MW exist offshore in very shallow waters of 5 to 12 m. Compared to onshore wind turbines, offshore wind turbines are bigger and the tower height in offshore are in the range of 60 to 80 m. The water depths in oceans where offshore turbines can be located are within 30 m. However as the distance from land increases, the costs of building and maintaining the turbines and transmitting the power back to shore also increase sharply. The objective of this paper is to review the parameters of design for the maximum efficiency of offshore wind turbines and to develop types offshore towers to support the wind turbines. The methodology of design of offshore towers to support the wind turbine would be given and the environmental loads for the design of the towers would be calculated for specific cases. The marine corrosion on the towers and the methods to control the corrosion also would be briefly presented. As the wind speeds tend to increase with distance from the shore, turbines build father offshore will be able to capture more wind energy. Currently two types of towers are considered. Cylindrical tubular structures and truss type structures. But truss type structures have less weight and flexibility in design. The construction of the offshore towers to harness the wind energy is also presented. The results will include the calculation of wind and wave forces on the tower and the design details for the tower.

  18. Offshore rectenna feasbility

    NASA Technical Reports Server (NTRS)

    Freeman, J. W.; Hervey, D.; Glaser, P.

    1980-01-01

    A preliminary study of the feasibility and cost of an offshore rectenna to serve the upper metropolitan east coast was performed. A candidate site at which to build a 5 GW rectenna was selected on the basis of proximity to load centers, avoidance of shipping lanes, sea floor terrain, and relocated conditions. Several types of support structures were selected for study based initially on the reference system rectenna concept of a wire mesh ground screen and dipoles each with its own rectifier and filter circuits. Possible secondary uses of an offshore rectenna were examined and are evaluated.

  19. Welding vacuum jacketed piping at the Kennedy Space Center

    NASA Technical Reports Server (NTRS)

    Clautice, W. E.

    1975-01-01

    The present work describes fabrication, welding, and repair procedures and specifications for the vacuum jacketed piping used for conveying cryogenic fuels at space vehicle launch sites. The weld inspection procedures are described, and some examples of modifications of the piping are presented.

  20. Red Jacket and the Decolonization of Republican Virtue

    ERIC Educational Resources Information Center

    Ganter, Granville

    2007-01-01

    History has not always been kind to Sagoyewatha, or, as he is more commonly known, Red Jacket. One of the most eloquent spokesmen for Native sovereignty in the early national period, Sagoyewatha was nonetheless accused by his peers of cowardice, alcoholism, and egotism. Fortunately, this picture is beginning to change. Christopher Densmore's…

  1. VIEW POURING PLATFORM SHOWING MOLD POURING JACKETS AND WEIGHTS AND, ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    VIEW POURING PLATFORM SHOWING MOLD POURING JACKETS AND WEIGHTS AND, IN THE FOREGROUND, SAND RETURN FROM THE SHAKEOUT ACTUATING A SIMPLE LEVER SYSTEM THAT ADDED FRESH WATER TO THE SAND IN PREPARATION FOR ITS REUSE. - Southern Ductile Casting Company, Centerville Foundry, 101 Airport Road, Centreville, Bibb County, AL

  2. Method of preventing leakage of a fluid along and through an insulating jacket of a thermocouple

    DOEpatents

    Thermos, Anthony Constantine (Greer, SC); Rahal, Fadi Elias (Easley, SC)

    2002-01-01

    A thermocouple assembly includes a thermocouple; a plurality of lead wires extending from the thermocouple; an insulating jacket extending along and enclosing the plurality of leads; and at least one internally sealed area within the insulating jacket to prevent fluid leakage along and within the insulating jacket. The invention also provides a method of preventing leakage of a fluid along and through an insulating jacket of a thermocouple including the steps of a) attaching a plurality of lead wires to a thermocouple; b) adding a heat sensitive pseudo-wire to extend along the plurality of lead wires; c) enclosing the lead wires and pseudo-wire inside an insulating jacket; d) locally heating axially spaced portions of the insulating jacket to a temperature which melts the pseudo-wire and fuses it with an interior surface of the jacket.

  3. Judging a movie by its cover: A content analysis of sexual portrayals on video rental jackets

    Microsoft Academic Search

    Mary Beth Oliver; Omotayo Banjo; Jinhee Kim

    2003-01-01

    A content analysis of video rental jackets was conducted to examine the prevalence and nature of sexual portrayals. While\\u000a sexuality in the general photo themes and written descriptions (teasers) on the jackets was relatively uncommon, attractive\\u000a characters and characters in sexy clothing and with skin exposed were more frequently observed. Female characters on the jackets\\u000a were more likely than male

  4. When in Rome : does Polygon need a jacket?

    NSDL National Science Digital Library

    National Council of Teachers of Mathematics (NCTM)

    2002-01-01

    This activity asks students to decide if a tourist visiting Rome should wear a jacket if the temperature is 35 degrees Celsius. The activity is part of the FigureThis! collection of challenges that emphasize math in the real world. Students are encouraged to approach the problem by drawing a thermometer and labeling it with the freezing and boiling points of water in both the Fahrenheit and Celsius scales. The solution presents a diagram and the formula for converting Celsius to Fahrenheit. The activity includes links to related questions and additional resources online. Copyright 2005 Eisenhower National Clearinghouse

  5. Sea loads on ships and offshore structures

    SciTech Connect

    Faltinsen, O. (Norwegian Inst. of Technology (NO))

    1990-01-01

    The book introduces the theory of the structural loading on ships and offshore structures caused by wind, waves and currents, and goes on to describe the applications of this theory in terms of real structures. The main topics described are linear-wave induced motions, loads on floating structures, numerical methods for ascertaining wave induced motions and loads, viscous wave loads and damping, stationkeeping and water impact and entry. The applications of the theoretical principles are introduced with extensive use of exercises and examples. Applications covered include conventional ships, barges, high speed marine vehicles, semisubmersibles, tension leg platforms, moored or dynamic positioned ships, risers, buoys, fishing nets, jacket structures and gravity platforms. One aim of the book is to provide a physical understanding through simplified mathematical models. In this way one can develop analytical tools to evaluate results from test models, full scale trials or computer simulation, and learns which parameters represent the major contributions and influences on sea loads.

  6. Low Life Jacket Use among Adult Recreational Boaters: A Qualitative Study of Risk Perception and Behavior Factors

    PubMed Central

    Quistberg, D. Alex; Bennett, Elizabeth; Quan, Linda; Ebel, Beth E.

    2013-01-01

    Background Life jackets may prevent one in two drowning deaths, however, 85% of recreational boating-related drowning victims in the United States in 2012 did not wear a life jacket. This study explored behavioral factors and strategies to encourage consistent life jacket use among adult recreational boaters. Methods We conducted a qualitative study among boat owners who boat regularly, and explored factors associated with life jacket use by adults and child or adolescent passengers. Sixteen boaters participated in four focus groups. Results Most boaters reported inconsistent use of life jackets, using them only when conditions were poor. Each described episodes of unpredictable boating risk which occurred despite favorable conditions. Most required younger child passengers to wear a life jacket, but reported resistance among older children. Barriers to consistent life jacket use included discomfort and the belief that life jacket use indicated inexperience or poor swimming ability. Participants stated that laws requiring life jacket use would change behavior especially for children. The only demonstrated behavior change among group members was associated with use of inflatable life jacket devices. Conclusions Boating risk is inherently unpredictable; therefore interventions should focus on strategies for increasing consistent use of life jackets. Passage and enforcement of life jacket legislation for older children and adults is likely a promising approach for behavior change. Designing more comfortable, better-fitting, more appealing life jackets will be paramount to encouraging consistent use. PMID:24211559

  7. The investigation of the impact of basic operational parameters on the dynamics of water jacket in a biomass boiler using numerical and experimental methods

    NASA Astrophysics Data System (ADS)

    Szubel, Mateusz; Filipowicz, Mariusz

    2015-05-01

    Biomass boiler application, despite its many advantages, is dependent upon many technical aspects, which require tests and optimization. Because of practical constraints, one of the most problematic areas of research is the analysis of phenomena occurring inside the water jacket of the boiler during the combustion process. The issue referred to above is significant due to its direct impact on the heating up of the operating medium for current power of the device and the total efficiency. The paper presents the analytical possibilities of the operating medium in a biomass boiler water jacket. The experimental works conducted as a part of the study were performed using an actual device - EKOPAL RM 40 straw boiler. They were aimed at defining the values of significant boundary conditions. Resistance thermometers and K-type thermocouples connected to a data acquisition system were placed in selected points of the water jacket and the combustion chambers to allow the monitoring of the conditions of the water heating process during biomass combustion. A measurement of inlet water mass flow rate was performed. To develop a numerical model of heat transfer into the water jacket, ANSYS CFX software was applied. The results of the experiments and simulations were compared and discussed. The paper describes the methodology and instruments used to perform the experimental studies, as well as some optimization solutions developed based on the results of the numeric alanalysis.

  8. Mari Voldsund Exergy analysis of offshore

    E-print Network

    Kjelstrup, Signe

    Mari Voldsund Exergy analysis of offshore oil and gas processing Doctoral thesis for the degree my contact persons, helping out both with administrative issues, and with matters concerning offshore on different types of North Sea platforms; (ii) identify and discuss improvement potentials for each case

  9. Development of Jacketing Technologies for Iter CS and TF Conductor

    NASA Astrophysics Data System (ADS)

    Hamada, K.; Nakajima, H.; Matsui, K.; Kawano, K.; Takano, K.; Tsutsumi, F.; Okuno, K.; Teshima, O.; Soejima, K.

    2008-03-01

    The Japan Atomic Energy Agency (JAEA) has developed jacketing technologies for ITER Toroidal Field (TF) and Central Solenoid (CS) conductor. Full scale TF and CS conduits were fabricated using carbon-reduced SUS316LN and boron-added (˜40 ppm) high manganese stainless steel (0.025C -22Mn -13Cr -9Ni -0.12N: JK2LB), respectively. Welding condition was optimized so that back bead does not interfere a cable insertion. The weld joint samples were compacted by a compaction machine that was newly constructed and tested at 4.2 K. Mechanical characteristics at 4K of CS, TF conduits and CS welded joint satisfied ITER mechanical requirements. TF welded joint shows slightly lower value of 0.2% yield strength (885 MPa) than that of ITER requirement (900 MPa). The TF conduit contains nitrogen content of 0.14%, which is minimum value in ITER specification. The lower nitrogen content may be caused by the release of nitrogen from molten metal during non-filler welding resulting in a 4 K strength decrease. To satisfy the ITER requirements, minimum nitrogen contents of conduit should be increased from 0.14% to 0.15% at least. Therefore, JAEA successfully developed TF and CS conduits with welding technologies and finalized the procurement specification for ITER conductor jacketing.

  10. Tensile tests of ITER TF conductors jacket materials

    NASA Astrophysics Data System (ADS)

    Anashkin, O. P.; Kеilin, V. E.; Krivykh, A. V.; Diev, D. N.; Dinisilov, A. S.; Shcherbakov, V. I.; Tronza, V. I.

    2012-06-01

    The set of very tough requirements has been formulated for TF jacket materials with extremely high plasticity at liquid helium temperature. The stainless steel 316LN-IG is recommended to be used for TF jacket tubes. Samples of 316LN-IG tubes (whole tubes and sub-size samples) made of the material from the same electro slag remelt have been tested in different conditions - as received tubes and tubes after prescribed compaction, 2.5% deformation at room temperature and heat treatment at 650 0C, 200 hours. The tensile tests were carried out at room, liquid nitrogen and liquid helium temperatures down to 4.2 K, meeting corresponding ASME and ASTM requirements. The low temperature testing devices are described. The tests results for sub-size samples and whole tubes show that the latter tests are considerably more representative and important for butt weld qualification at LHe temperature. It was observed that the ferromagnetic properties of all samples and especially of butt welds increase with lowering the temperature and increasing the degree of deformation. At LHe temperature a non-uniform and highly localized serrated deformations were observed.

  11. Pressure Drop Across Finned Cylinders Enclosed in a Jacket

    NASA Technical Reports Server (NTRS)

    Rollin, Vern G; Ellerbrock, Herman H

    1937-01-01

    The pressure drop across finned cylinders in a jacket for a range of air speeds from approximately 13 to 230 miles per hour has been investigated. Tests were made to determine the effect on the pressure drop of changes in fin space, fin width, jacket entrance and exit areas, skirt-approach radius, and the use of fillets and a separator plate at the rear of the cylinder. The pressure drop across the cylinder increased as the fin space decreased, the increase being very rapid at fin spaces smaller than approximately 0.20 inch. Fin width had little effect on the pressure drop for the range of widths tested. The pressure drop across the cylinder was nearly halved by increasing the skirt-approach radius from 3/4 inch to 1-1/4 inches, but fillets and a separator plate at the rear of the cylinder had little effect on the pressure drop. The pressure drop across a cylinder with tapered fins was greater than that for a cylinder having rectangular fins with the same effective fin spacing.

  12. Comparing the cyclic behavior of concrete cylinders confined by shape memory alloy wire or steel jackets

    Microsoft Academic Search

    Eunsoo Choi; Hong-Taek Kim

    2011-01-01

    Shape memory alloy (SMA) wire jackets for concrete are distinct from conventional jackets of steel or fiber reinforced polymer (FRP) since they provide active confinement which can be easily achieved due to the shape memory effect of SMAs. This study uses NiTiNb SMA wires of 1.0 mm diameter to confine concrete cylinders with the dimensions of 300 mm × 150

  13. An overview of offshore wind electric energy resources

    Microsoft Academic Search

    Hamed H. Aly; M. E. El-Hawary

    2010-01-01

    In this paper we review offshore wind energy for generating electricity at off-shore sites. In particular, we survey the impacts of offshore wind integration into the grid, various types of generators and their dynamic modeling, fault ride-through techniques used to improve generator and grid integration performance, the aggregated wind turbines modeling and finally highlight some stability and control issues.

  14. A complete metal jacket case using ten paclitaxel-eluting stents for multiple de novo coronary artery lesions

    Microsoft Academic Search

    Soon Yong Suh; Seung-Woon Rha; Cheol Ung Choi; Jin Won Kim; Eung Ju Kim; Chang Gyu Park; Hong Seog Seo; Dong Joo Oh

    2007-01-01

    Although full metal jacket using drug-eluting stent (DES) for a single coronary artery disease has sparsely been described before, there is no report of safety and efficacy of complete metal jacket from left main (LM) to three major coronary arteries. We report a complete metal jacket case using 10 paclitaxel-eluting stents (PES; Taxus™, Boston Scientific) for a triple vessel diffuse

  15. Measurement of fecal corticosterone metabolites as a predictor of the habituation of rhesus macaques (Macaca mulatta) to jacketing.

    PubMed

    Field, Amy E; Jones, Cynthia L; Kelly, Richard; Marko, Shannon T; Kern, Steven J; Rico, Pedro J

    2015-01-01

    Jacket use in NHP is a common practice and is often considered a form of refinement during experiments necessitating extended periods of catheterization. An important consideration when using jackets is the physiologic effects that jacketing has on NHP and its potential to confound research. Several studies have evaluated the stress response and habituation of NHP to various forms of restraint, but none have looked directly at the timeframe necessary for the habituation of rhesus macaques (Macaca mulatta) to jackets. We set out to determine whether 3 d was a sufficient timeframe for this species to become habituated to a jacket, with or without an undershirt, by evaluating 2 major physiologic parameters. After jacket placement, we measured food consumption and collected fecal samples to measure fecal corticosterone metabolites (FCM) daily for 2 wk. FCM measurements for NHP without undershirts were significantly increased for days 2 and 3 after jacketing before returning to baseline levels. FCM measurements for NHP with undershirts were significantly increased for only 1 d after jacketing, suggesting that the undershirt has a positive effect on jacket habituation. There were no measurable differences in food consumption during the jacket habituation period. Furthermore, no significant differences were noted between sexes. These findings suggest that FCM levels return to baseline 3 d after jacketing and could be a useful predictor of jacket habituation in rhesus macaques. PMID:25651092

  16. The confining effectiveness of NiTiNb and NiTi SMA wire jackets for concrete

    NASA Astrophysics Data System (ADS)

    Choi, Eunsoo; Chung, Young-Soo; Choi, Jun-Hyeok; Kim, Hong-Taek; Lee, Hacksoo

    2010-03-01

    The purpose of this study is to assess the confining effectiveness of shape memory alloy (SMA) wire jackets for concrete. The performance of SMA wire jackets was compared to that of steel jackets. A prestrained martensitic SMA wire was wrapped around a concrete cylinder and then heated by a heating jacket. In the process, a confining stress around the cylinder was developed in the SMA wire due to the shape memory effect; this jacketing method can increase the strength and ductility of the cylinder under an axial compressive load. In this study, NiTi and NiTiNb SMA wires of 1.0 mm in diameter were used for the confinement. Recovery tests were conducted on the wires to assess their recovery and residual stress. The confinement by SMA wire jackets increased the strength slightly and greatly increased the ductility compared to the strength and ductility of plain concrete cylinders. The NiTiNb SMA wire jacket showed better performance than that of the NiTi SMA wire jacket. The confining effectiveness of the SMA wire jackets of this study was estimated to be similar to that of the steel jackets. This study showed the potential of the SMA wire jacketing method to retrofit reinforced concrete columns and protect them from seismic risks.

  17. Lightweight Vacuum Jacket for Cryogenic Insulation - Appendices to Final Report. Volume 2

    NASA Technical Reports Server (NTRS)

    Barclay, D. L.; Bell, J. E.; Brogren, E. W.; Straayer, J. W.

    1975-01-01

    The feasibility is demonstrated of producing a lightweight vacuum jacket using state-of-the-art technology and materials. Design and analytical studies were made on an orbital maneuvering system fuel tank. Preliminary design details were completed for the tank assembly which included an optimized vacuum jacket and multilayered insulation system. A half-scale LH2 test model was designed and fabricated and a force/stiffness proof test was conducted on the vacuum jacket. A vacuum leak rate of 0.00001 was measured, approximately 1500 hours of vacuum pressure was sustained, and 29 vacuum pressure cycles were experienced prior to failure. For vol. 1, see N75-26192.

  18. Properties of stainless steels for fusion conductor jackets and their manufacturing techniques

    SciTech Connect

    Forster, S.; Komarek, P.; Nyilas, A.; Ulbricht, A. (Kernforschungszentrum Karlsruhe GmbH (Germany). Inst. fuer Technische Physik)

    1992-01-01

    This paper reports on a superconducting cable for a fusion magnet that has to be reinforced by a stainless steel jacket which envelopes the cable. The jackets are fabricated by extruded and butt welded steel sections or by composing the jacket from drawn sections with longitudinal welds. Fatigue life and fatigue crack growth rates were investigated at 10 K for embedded and surface cracks for the candidate material 316LN. Embedded cracks are more severe as compared to surface cracks. The predicted cyclic life agrees with the measured one.

  19. Assessing offshore wind potential

    Microsoft Academic Search

    Adesoji Adelaja; Charles McKeown; Benjamin Calnin; Yohannes Hailu

    2012-01-01

    Quantifying wind potential is a pivotal initial step in developing and articulating a state’s policies and strategies for offshore wind industry development. This is particularly important in the Great Lakes States where lessons from other offshore environments are not directly applicable. This paper presents the framework developed for conducting a preliminary assessment of offshore wind potential. Information on lake bathymetry

  20. Offshore Wind Geoff Sharples

    E-print Network

    Kammen, Daniel M.

    States Cape Wind PPA at 18 c/kWh #12;The cycle of non-innova?on OffshoreOffshore Wind Geoff Sharples geoff@clearpathenergyllc.com #12;Frequently Unanswered Ques?ons · Why don't "they" build more offshore wind? · Why not make

  1. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ... (b) Each inflatable lifejacket and hybrid inflatable lifejacket or work vest must...specified by the Commandant. (d) Each hybrid inflatable life jacket or work vest must...Commandant, except for emergency repairs carried out on board the vessel. [CGD...

  2. 46 CFR 185.730 - Servicing of inflatable liferafts, inflatable buoyant apparatus, inflatable life jackets, and...

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ... (b) Each inflatable lifejacket and hybrid inflatable lifejacket or work vest must...specified by the Commandant. (d) Each hybrid inflatable life jacket or work vest must...Commandant, except for emergency repairs carried out on board the vessel. [CGD...

  3. Yellow jackets may be an underestimated component of an ant-seed mutualism

    USGS Publications Warehouse

    Bale, M.T.; Zettler, J.A.; Robinson, B.A.; Spira, T.P.; Allen, C.R.

    2003-01-01

    Yellow jackets (Hymenoptera: Vespidae) are attracted to the typically ant-dispersed seeds of trilliums and will take seeds from ants in the genus Aphaenogaster. To determine if yellow jacket, Vespula maculifrons (Buysson), presence interferes with seed foraging by ants, we presented seeds of Trillium discolor Wray to three species (A. texana carolinensis Wheeler, Formica schaufussi Mayr, and Solenopsis invicta Buren) of seed-carrying ants in areas where vespids were present or excluded. We found that interspecific aggression between yellow jackets and ants is species specific. Vespid presence decreased average foraging time and increased foraging efficiency of two of the three ant species studied, a situation that might reflect competition for a limited food source. We also found that yellow jackets removed more seeds than ants, suggestive that vespids are important, albeit underestimated, components of ant-seed mutualisms.

  4. Evaluation of sleeve-pile set models used in docking jacket operation simulation

    SciTech Connect

    Cyranka, C.; Mourelle, M.M. [Petrobras R and D Center, Rio de Janeiro (Brazil); Ebecken, N.F.F. [Federal Univ. of Rio de Janeiro (Brazil)

    1995-12-31

    This work deals with the behavior of sleeve-pile set models used in the simulation of docking jacket operations. The adopted strategy involves the comparison of three-dimensional dynamic analysis with complete models, where docking pile and marine soil are considered. This dynamic analysis is performed in the time domain, including all the environmental loads and ship motions, using a substructure technique. The main discussion is focused in appropriate modeling the sleeve-pile set. Two propositions were examined: in the first one, the nonlinear docking spring takes into account the sleeve, pile and nonlinear soil contributions; in the second, the docking sleeve characteristics were added to the jacket model. To reach the objectives a real docking operation case was selected. A typical Campos Basin jacket was modeled with fine discretization of all details to access precisely the sleeve-pile set interaction. The obtained results can establish practical conclusions to docking jacket analysis.

  5. On the importance of the 7.62 mm FFV bullet jacket during penetration

    NASA Astrophysics Data System (ADS)

    Roberts, Andrew; Hazell, Paul; Appleby-Thomas, Gareth; Hameed, Amer; Gibson, Michael

    2013-06-01

    While a critical part of the bullet structure, relatively little attention has traditionally been paid to the effects of the jacket during penetration. Recent work has suggested that the jacket of a 7.62 mm FFV projectile measurably affects penetration into ceramic-faced targets. In this study a series of both forwards and reverse ballistics shots employing 7.62 mm FFV rounds accelerated into at c.a. 830 m/s (and vice-versa) were undertaken. The various FFV rounds were prepared with differing degrees of jacket modification about their tip. Penetration mechanisms were interrogated using a multi-channel flash X-ray system; while a series of depth-of-penetration tests provided a route to quantitatively assess the contribution of the jacket to penetration.

  6. New Structural-Dynamics Module for Offshore Multimember Substructures within the Wind Turbine Computer-Aided Engineering Tool FAST: Preprint

    SciTech Connect

    Song, H.; Damiani, R.; Robertson, A.; Jonkman, J.

    2013-08-01

    FAST, developed by the National Renewable Energy Laboratory (NREL), is a computer-aided engineering (CAE) tool for aero-hydro-servo-elastic analysis of land-based and offshore wind turbines. This paper discusses recent upgrades made to FAST to enable loads simulations of offshore wind turbines with fixed-bottom, multimember support structures (e.g., jackets and tripods, which are commonly used in transitional-depth waters). The main theory and strategies for the implementation of the multimember substructure dynamics module (SubDyn) within the new FAST modularization framework are introduced. SubDyn relies on two main engineering schematizations: 1) a linear frame finite-element beam (LFEB) model and 2) a dynamics system reduction via Craig-Bampton's method. A jacket support structure and an offshore system consisting of a turbine atop a jacket substructure were simulated to test the SubDyn module and to preliminarily assess results against results from a commercial finite-element code.

  7. Evaluation of the Use of Primate Undershirts as a Refinement Practice for Jacketed Rhesus Macaques (Macaca mulatta)

    PubMed Central

    Carlson, Amy; Kern, Steven J; Field, Amy; Marko, Shannon; Bailey, Emily; Norris, Sarah; Honko, Anna; Rico, Pedro

    2014-01-01

    Jacketing of nonhuman primates (NHP) is a commonly used practice in the laboratory animal setting to support data collection with reduced direct human-to-animal interaction. NHP often wear jackets for several weeks, potentially leading to the formation of dermal lesions ranging from mild alopecia to severe full-thickness ulceration. We sought to evaluate the addition of a commercially available undershirt for primates as a possible refinement practice for our jacketed rhesus macaques. In this study, we compared the lesion count, location, and severity and differences in rectal body temperature between jacketed NHP with undershirts with those wearing the jackets alone. In both groups, most lesions (75%) were located at either the underarm or shoulder. The percentages of total lesions in the back and neck were lower in jacketed NHP that wore undershirts than in those that did not. In addition, the estimated odds of increased severity scores in jacketed NHP without undershirts was 1.80 times that for NHP that wore both jackets and undershirts. Both groups of NHP showed a significant decrease in dermal scores with time, indicating adaptation to the jackets with or without undershirts. However, there was no statistically significant decrease in lesion count, severity, or location in jacketed NHP that wore undershirts compared with those that did not. PMID:24827568

  8. Variable pressure insulating jackets for high-temperature batteries

    SciTech Connect

    Nelson, P.A.; Chilenskas, A.A.; Malecha, R.F.

    1992-01-01

    A new method is proposed for controlling the temperature of high-temperature batteries namely, varying the hydrogen pressure inside of multifoil insulation by varying the temperature of a reversible hydrogen getter. Calculations showed that the rate of heat loss through 1.5 cm of multifoil insulation between a hot-side temperature of 425[degrees]C and a cold-side temperature of 25[degrees]C could be varied between 17.6 W/m[sup 2] and 7,000 W/m[sup 2]. This change in heat transfer rate can be achieved by varying the hydrogen pressure between 1.0 Pa and 1,000 Pa, which can be done with an available hydrogen gettering alloy operating in the range of 50[degrees]C to 250[degrees]C. This approach to battery cooling requires cylindrical insulating jackets, which are best suited for bipolar batteries having round cells approximately 10 to 18 cm in diameter.

  9. Variable pressure insulating jackets for high-temperature batteries

    SciTech Connect

    Nelson, P.A.; Chilenskas, A.A.; Malecha, R.F.

    1992-12-31

    A new method is proposed for controlling the temperature of high-temperature batteries namely, varying the hydrogen pressure inside of multifoil insulation by varying the temperature of a reversible hydrogen getter. Calculations showed that the rate of heat loss through 1.5 cm of multifoil insulation between a hot-side temperature of 425{degrees}C and a cold-side temperature of 25{degrees}C could be varied between 17.6 W/m{sup 2} and 7,000 W/m{sup 2}. This change in heat transfer rate can be achieved by varying the hydrogen pressure between 1.0 Pa and 1,000 Pa, which can be done with an available hydrogen gettering alloy operating in the range of 50{degrees}C to 250{degrees}C. This approach to battery cooling requires cylindrical insulating jackets, which are best suited for bipolar batteries having round cells approximately 10 to 18 cm in diameter.

  10. Offshore Training

    ERIC Educational Resources Information Center

    Training Officer, 1974

    1974-01-01

    Industrial trainers face a critical challenge--supplying qualified personnel for work both off and onshore to service and run Great Britain's infant oil industry in the North Sea. A review of the activities, types of employment involved, extraneous factors affecting the industry, and employment projections are discussed. (MW)

  11. A complete metal jacket case using ten paclitaxel-eluting stents for multiple de novo coronary artery lesions.

    PubMed

    Suh, Soon Yong; Rha, Seung-Woon; Choi, Cheol Ung; Kim, Jin Won; Kim, Eung Ju; Park, Chang Gyu; Seo, Hong Seog; Oh, Dong Joo

    2007-02-01

    Although full metal jacket using drug-eluting stent (DES) for a single coronary artery disease has sparsely been described before, there is no report of safety and efficacy of complete metal jacket from left main (LM) to three major coronary arteries. We report a complete metal jacket case using 10 paclitaxel-eluting stents (PES; Taxus, Boston Scientific) for a triple vessel diffuse de novo coronary diseases who refused coronary artery bypass graft. PMID:17126931

  12. Offshore wind energy systems

    Microsoft Academic Search

    P. Musgrove

    1978-01-01

    Wind energy systems deployed in the shallow but windy waters of the southern North Sea have the potential to provide more than 20% of UK electricity needs. With existing experience of windmills, and of aircraft and offshore structures, such wind energy systems could be developed within a relatively short timescale. A preliminary assessment of the economics of offshore wind energy

  13. CONGRESSIONAL BRIEFING Offshore Wind

    E-print Network

    Firestone, Jeremy

    · Fishermen's Energy · Cape Wind · BVG Associates · Maryland Energy Administration · New Bedford (MA) MarineCONGRESSIONAL BRIEFING Offshore Wind Lessons Learned from Europe: Reducing Costs and Creating Jobs Thursday, June 12, 2014 Capitol Visitors Center, Room SVC 215 Enough offshore wind capacity to power six

  14. EVALUATION OF THE FAILURE OF A RADIOACTIVE WASTE TRANSFER LINE JACKET

    SciTech Connect

    Wiersma, B; Alan03 Plummer, A; Karthik Subramanian, K; Charles Jenkins, C; William Hinz, W; A Fellinger, A

    2007-04-06

    Radioactive wastes are confined in 49 underground storage tanks at the Savannah River Site. The waste is transported between tanks primarily via an underground transfer piping system. Due to the hazardous nature of the waste, the inner core stainless steel pipe is typically surrounded by a carbon steel pipe jacket, which provides secondary containment. Recently several through-wall penetrations were discovered on a segment of one of the jackets. An evaluation was performed to verify the failure mechanism and to estimate the degree of damage that occurred to the pipe segment. Failure analysis of a section of the jacket confirmed that pitting corrosion on the exterior of the pipe led to the through-wall penetration. Ultrasonic measurements on sections of the pipe were utilized to determine the remaining wall thickness in adjacent areas of the pipe. Based on these measurements, the degree of pitting and general corrosion was determined. Pit growth rate models were then developed to estimate the life expectancy of sections of the pipe that had not been excavated. The calculations estimated that the occurrence of through-wall failures in this jacket will begin to increase substantially in 12 years. Given that this pipe segment will be utilized beyond this time, short-term and long-term solutions to this failure were proposed. The short-term solutions focused on the repair or replace decisions that must be made to return the jacket to service as soon as practical. The long-term solutions focused on a broader strategy to address jacket integrity issues in the entire tank farm facility. These solutions included the evaluation of innovative remote inspection and repair techniques.

  15. New concepts are the key to tomorrow's offshore fields

    SciTech Connect

    Moore, S.D.

    1982-10-01

    This paper evaluates efforts to improve deepwater drilling technology. It reveals that technology now exists for drilling in 6,500 ft of water, though only a half-dozen vessels are capable of such efforts. On the drawing board are several unique rig designs with greater deck capacity and enhanced motion characteristics that could make drilling in 6,500 to 8,000 ft a realistic endeavor. Standard steel-jacket platforms are not as economical as alternative designs in deeper waters. Exxon is installing a guyed tower in 1,000 ft of water in the Gulf of Mexico. Other fixed structures include the tripod tower platform (TTP), the Mandrill 400, the deep G3, and the Base and Independent Deck(BID) platform. The paper concludes that although the industry is in a state of uncertainty, many of these new offshore concepts will be implemented in the coming decade.

  16. Visual Simulation of Offshore Liquefied Natural Gas (LNG) Terminals

    E-print Network

    Standiford, Richard B.

    Visual Simulation of Offshore Liquefied Natural Gas (LNG) Terminals in a Decision-Making Context1, Berkeley. 3/ Liquified Natural Gas Act Stats, 1977, Chap. 855, Page 2506 (effective Sept. 17, 1977 potential offshore Liquified Natural Gas (LNG) sites and the types of terminals that might occupy those

  17. RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT)

    E-print Network

    Bernstein, Joseph B.

    RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT) Yizhou Lu, T. M. Delorm, A. Christou of survivor functions R(t) of drive-trains, after 1 year of operation, between Offshore Wind Turbine (OWT) vs (Types1-4a) - horizontal axis turbines (3-6 MW) were selected for reliability modelling & technology

  18. Loading and Response of Offshore Wind Turbine Support Structures: Prediction with Comparison to Measured Data

    E-print Network

    Sweetman, Bert

    design of two well- known structural types: onshore turbines and offshore oil production platforms. Wave these loads are based on existing methodologies proven to be effective for offshore oil platforms. However, offshore wind support platforms differ from oil platforms is several important ways: First, wind platforms

  19. Response mitigation on the offshore floating platform system with tuned liquid column damper

    Microsoft Academic Search

    H. H. Lee; S.-H. Wong; R.-S. Lee

    2006-01-01

    In this study a typical tension-leg type of floating platform incorporated with the tuned liquid column damper (TLCD) device is studied. The purpose is to find an effective and economic means to reduce the wave induced vibrations of the floating offshore platform system. The floating offshore platform has been widely applied for the offshore exploitation such as operation station, cross-strait

  20. Applications for concrete offshore

    SciTech Connect

    Not Available

    1982-01-01

    The report collects and summarizes the various proposals for development offshore which have in common the use of concrete as the main structural material, and where possible, indicates their relative feasibility. A study encompassing such diverse schemes as offshore windmills, concrete LNG carriers, hydrocarbon production platforms and floating airports cannot be completely exhaustive on each subject, so references to sources of further information have been given wherever possible. Details of individual projects and proposals are included for Power plants, Hydrocarbon production platforms, Concrete ships, Storage systems and industrial plants, Subsea systems, Offshore islands, Coastal works and Other concrete structures.

  1. Servicing the offshore industry

    SciTech Connect

    NONE

    1997-03-01

    What factors are leading operators to using boat-based services vs. those that are rig-based for offshore completions, stimulations and workovers? What trends are companies experiencing in completion practices for the unconsolidated formations in the Gulf of Mexico? What are companies` most important specifications for well service boats operating near their offshore platforms? To answer these and other questions, Petroleum Engineering International asked those who should know -- the producing companies active in offshore operations in the Gulf of Mexico and worldwide.

  2. [Possible errors in measuring gunshot distance with ricochet full jacket projectiles].

    PubMed

    Schyma, C; Bittner, M

    1995-01-01

    Experiments with ricocheted 9 mm Luger full jacket projectiles showed results which feign shots from short distance. The morphology of the wound and the destruction in textile is very varying. The marks of scattered lead were examined by micro radiography. PMID:7575091

  3. Behaviour of FRP-jacketed circular steel tubes and cylindrical shells under axial compression

    Microsoft Academic Search

    J. G. Teng; Y. M. Hu

    2007-01-01

    Fibre-reinforced polymer (FRP) jackets have been widely used to confine reinforced concrete (RC) columns for enhancement in both strength and ductility. This paper presents the results of a recent study in which the benefit of FRP confinement of hollow steel tubes was explored. Axial compression tests on FRP-confined steel tubes are first described. Finite element modelling of these tests is

  4. Wireless E-Jacket for Multiparameter Biophysical Monitoring and Telemedicine Applications

    Microsoft Academic Search

    S. Nag; D. K. Sharma

    2006-01-01

    A widespread requirement exists for a low cost and reliable health monitor in the clinical as well as home environment. The e-jacket presented here is an example of a smart clothing system with multiple bioparameter acquisition of electrocardiogram (ECG), pulse oximetry, body motion\\/tilt and skin temperature. The battery operated circuit has an integrated graphic liquid crystal display (LCD) screen and

  5. Management of offshore wastes in the United States.

    SciTech Connect

    Veil, J. A.

    1998-10-22

    During the process of finding and producing oil and gas in the offshore environment operators generate a variety of liquid and solid wastes. Some of these wastes are directly related to exploration and production activities (e.g., drilling wastes, produced water, treatment workover, and completion fluids) while other types of wastes are associated with human occupation of the offshore platforms (e.g., sanitary and domestic wastes, trash). Still other types of wastes can be considered generic industrial wastes (e.g., scrap metal and wood, wastes paints and chemicals, sand blasting residues). Finally, the offshore platforms themselves can be considered waste materials when their useful life span has been reached. Generally, offshore wastes are managed in one of three ways--onsite discharge, injection, or transportation to shore. This paper describes the regulatory requirements imposed by the government and the approaches used by offshore operators to manage and dispose of wastes in the US.

  6. NREL Software Aids Offshore Wind Turbine Designs (Fact Sheet)

    SciTech Connect

    Not Available

    2013-10-01

    NREL researchers are supporting offshore wind power development with computer models that allow detailed analyses of both fixed and floating offshore wind turbines. While existing computer-aided engineering (CAE) models can simulate the conditions and stresses that a land-based wind turbine experiences over its lifetime, offshore turbines require the additional considerations of variations in water depth, soil type, and wind and wave severity, which also necessitate the use of a variety of support-structure types. NREL's core wind CAE tool, FAST, models the additional effects of incident waves, sea currents, and the foundation dynamics of the support structures.

  7. Compact fan-out adapter for optical component packaging by a new jacket removing system with a CO2 laser

    Microsoft Academic Search

    Yutaka Katsuyama; Keisuke Ikushima; Ryou Sougen; Osanori Koyama; Makoto Yamada

    2010-01-01

    A novel fiber jacket removing system with a CO2 laser has been proposed to realize compact packaging of optical components. The fundamental conditions and procedures to remove fiber jackets were clarified experimentally, and the procedures were applied to fabricate a new compact fan-out adapter. The fan-out adapter can connect optical components compactly and effectively, when the packaging should have both

  8. Frequency variation and sensor contribution assessment: Application to an offshore platform in the South China Sea

    NASA Astrophysics Data System (ADS)

    Liu, Fushun; Li, Huajun; Wang, Weiying; Li, Wei; Wang, Bin

    2015-02-01

    In this paper, a time-frequency and multiple-sensor assessment method is presented and then applied to an offshore platform in the South China Sea with the goal of providing a more suitable time duration of measured signals and evaluating each sensor's contribution to mode shapes of interest. By processing all measured signals simultaneously, a series of linear parameters are used to fit the measured signals. A moving window in overlapping steps along the time record of a non-stationary signal is used for time-frequency analysis while a series of amplitude matrices are obtained for all sliced segments. These segments are then used to evaluate each sensor's contribution to some mode(s) of interest. Compared with the short-time Fourier transform (STFT) or S-transform method, the frequencies used in this time-frequency analysis are shared by the sensors involved so that the variations in the results due to the characteristics of different sensors are avoided. In addition, the approach requires only a short-duration segment to obtain high-frequency resolution, which will improve the computing efficiency of modal analysis using measured seat est data. The proposed method could also be used to estimate damping ratios and each sensor's contribution to modes of interest based on the analysis of the series of amplitude matrices; this could be used to guide the installation of sensors in field tests of offshore structures. To demonstrate the proposed method with a time-frequency analysis, a numerical example of a synthesized signal with five segments, each with its owns different frequency componentsincluding a relatively weaker component, is constructed; numerical results from the analysis of this example signal indicate that the approach could yield a sharper image with a good computing efficiency. The second example simulates three signals that represent multiple measurements; this example is used to study each sensor's contribution to different modes based on an amplitude matrix. Finally, measurements from a four-leg jacket-type offshore platform located in the Beibu Gulf in China are used to study the proposed method. It can be concluded that sea-test measurements of offshore platforms show frequency-varying characteristics, and the proposed method could provide a more suitable time duration of signals for modal analysis. The assembled 24 sensors are shown to have different contributions to frequencies at 1.0375 Hz, and the amplitude of each sensor will not be a constant when different segments of a measurement are used for analysis. However, each sensor's contribution to the assigned modes can be assessed based on average values. For example, the contribution of sensor 3 is estimated to be 12.5362 per cent, sensor 15's contribution is estimated to be 7.1803 per cent. Each sensor's importance to the mode of interest could then be evaluated.

  9. Offshore platform cathodic protection retrofits

    SciTech Connect

    Turnipseed, S.P. [Chevron Research and Technology Co., Richmond, CA (United States)

    1996-10-01

    Cathodic protection (CP) is the primary technique used for underwater corrosion control on the majority of offshore steel structures. Offshore platforms are often kept in service far beyond their original design life. Refurbishment of the CP system is required when adequate protection can no longer be maintained. Various offshore platform CP retrofit designs are discussed.

  10. 46 CFR 389.3 - Registration

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...the launching or installation of offshore platform jackets; and, (2) Provide...owners or operators of any type of offshore exploration, development, or...Maritime Administration by the platform owner or operator shall...

  11. Testing and evaluation of damaged tubular jacket braces

    E-print Network

    Moehlman, Scott Alan

    1990-01-01

    to provide data on the strength of damaged tubular members. Types of damage on the specimens included corrosion, dents, cracks, holes, and/or initial out-of-straightness. In addition, ultrasonic testing was performed to determine the wall thickness... of reduced cross section caused by corrosion 1. V damage. Since the most severe corrosion was often on the inside surface of the member, severely corroded regions were difficult to locate using only visual and ultrasonic testing. The ultrasonic wall...

  12. Dynamics of offshore structures

    SciTech Connect

    Patel, M.H.

    1989-01-01

    This book is a text on ocean engineering integrating the areas of design, construction, installation and operation of fixed and floating offshore structures. Includes basic equations and theoretical results with emphasis on the fundamentals of oceanography, basic fluid mechanics, wave theory and hydrodynamics.

  13. Offshore Wind Energy Systems

    ERIC Educational Resources Information Center

    Musgrove, P.

    1978-01-01

    Explores the possibility of installing offshore windmills to provide electricity and to save fuel for the United Kingdom. Favors their deployment in clusters to facilitate supervision and minimize cost. Discusses the power output and the cost involved and urges their quick development. (GA)

  14. The state of offshore

    SciTech Connect

    Nelson, B.F.

    1991-01-01

    In this book, the author explains the factors behind state involvement in offshore petroleum activities. From his analysis of government workings in Great Britain and Norway, he concludes that state intervention is determined by complex interactions among government officials, economic interests, and environmental pressures.

  15. Offshore Wind Research (Fact Sheet)

    SciTech Connect

    Not Available

    2011-10-01

    This 2-page fact sheet describes NREL's offshore wind research and development efforts and capabilities. The National Renewable Energy Laboratory is internationally recognized for offshore wind energy research and development (R&D). Its experience and capabilities cover a wide spectrum of wind energy disciplines. NREL's offshore wind R&D efforts focus on critical areas that address the long-term needs of the offshore wind energy industry and the Department of Energy (DOE). R&D efforts include: (1) Developing offshore design tools and methods; (2) Collaborating with international partners; (3) Testing offshore systems and developing standards; (4) Conducting economic analyses; (5) Characterizing offshore wind resources; and (6) Identifying and mitigating offshore wind grid integration challenges and barriers. NREL has developed and maintains a robust, open-source, modular computer-aided engineering (CAE) tool, known as FAST. FAST's state-of-the-art capabilities provide full dynamic system simulation for a range of offshore wind systems. It models the coupled aerodynamic, hydrodynamic, control system, and structural response of offshore wind systems to support the development of innovative wind technologies that are reliable and cost effective. FAST also provides dynamic models of wind turbines on offshore fixed-bottom systems for shallow and transitional depths and floating-platform systems in deep water, thus enabling design innovation and risk reduction and facilitating higher performance designs that will meet DOE's cost of energy, reliability, and deployment objectives.

  16. BAYESIAN UPDATING OF PROBABILISTIC TIME-DEPENDENT FATIGUE MODEL: APPLICATION TO JACKET FOUNDATIONS OF WIND TURBINES

    E-print Network

    Boyer, Edmond

    .rocher@univ-nantes.fr ABSTRACT Due to both wave and wind fluctuation, the metal foundations of offshore wind turbines are highly algorithm. KEYWORDS: Fatigue, Damage, Reliability, Bayesian updating. INTRODUCTION In offshore wind turbines OF WIND TURBINES Benjamin Rocher1,2 , Franck Schoefs1 , Marc François1 , Arnaud Salou2 1 LUNAM Université

  17. Offshore space center (offshore launch site)

    SciTech Connect

    Harvey, D.G.

    1980-07-01

    Any activity requiring the development of the HLLV can benefit by operations from an offshore space center (OSC) since operating near the equator provides a twenty percent increase in payload in an ecliptic plan orbit. Some OSC concepts considered include a moored floating (semisubmersible) design, a stationary design supported by fixed piles, and a combination of these two. The facility supports: a 15,000 foot long, 300 foot wide runway, designed to accommodate a two staged winged launch vehicle, with a one million pound payload capacity to low earth orbit, an industrial area for HLLV maintenance, an airport terminal, control and operation center, and observation tower, liquid hydrogen and liquid oxygen production and storage, and fuel storage platforms, a power generation station, docks with an unloading area, two separate launch sites, and living accommodations for 10,000 people. Potential sites include the Paramount Seamount in the Pacific Ocean off the north coast of South America. Cost estimates are considered.

  18. Offshore Space Center (offshore launch site)

    NASA Technical Reports Server (NTRS)

    Harvey, D. G.

    1980-01-01

    Any activity requiring the development of the HLLV can benefit by operations from an offshore space center (OSC) since operating near the equator provides a twenty percent increase in payload in an ecliptic plan orbit. Some OSC concepts considered include a moored floating (semisubmersible) design, a stationary design supported by fixed piles, and a combination of these two. The facility supports: a 15,000 foot long, 300 foot wide runway, designed to accommodate a two staged winged launch vehicle, with a one million pound payload capacity to low earth orbit; an industrial area for HLLV maintenance; an airport terminal, control and operation center, and observation tower; liquid hydrogen and liquid oxygen production and storage, and fuel storage platforms; a power generation station, docks with an unloading area; two separate launch sites; and living accommodations for 10,000 people. Potential sites include the Paramount Seamount in the Pacific Ocean off the north coast of South America. Cost estimates are considered.

  19. Dynamic behavior of offshore spar platforms under regular sea waves

    Microsoft Academic Search

    A. K. Agarwal; A. K. Jain

    2003-01-01

    Many innovative floating offshore structures have been proposed for cost effectiveness of oil and gas exploration and production in water depths exceeding one thousand meters in recent years. One such type of platform is the offshore floating Spar platform. The Spar platform is modelled as a rigid body with six degrees-of-freedom, connected to the sea floor by multi-component catenary mooring

  20. Solar power satellite offshore rectenna study

    NASA Astrophysics Data System (ADS)

    1980-11-01

    It was found that an offshore rectenna is feasible and cost competitive with land rectennas but that the type of rectenna which is suitable for offshore use is quite different from that specified in the present reference system. The result is a nonground plane design which minimizes the weight and greatly reduces the number of costly support towers. This preferred design is an antenna array consisting of individually encapsulated dipoles with reflectors supported on feed wires. Such a 5 GW rectenna could be built at a 50 m water depth site to withstand hurricane and icing conditions for a one time cost of 5.7 billion dollars. Subsequent units would be about 1/3 less expensive. The east coast site chosen for this study represents an extreme case of severe environmental conditions. More benign and more shallow water sites would result in lower costs. Secondary uses such as mariculture appear practical with only minor impact on the rectenna design. The potential advantages of an offshore rectenna, such as no land requirements, removal of microwave radiation from populated areas and minimal impact on the local geopolitics argue strongly that further investigation of the offshore rectenna should be vigorously pursued.

  1. Temporal variation in environmental conditions and the structure of fish assemblages around an offshore oil platform in the North Sea.

    PubMed

    Fujii, Toyonobu

    2015-07-01

    This study reports temporal variations in the environmental conditions and the structure of fish assemblages observed in the vicinity of an offshore oil platform and the surrounding seafloor in the North Sea. Multi-seasonal sampling was conducted at a typical large steel jacketed facility, using mid-water fish traps at three different depths (i.e., 10, 50 & 100 m). Commercially important gadoids such as saithe Pollachius virens, haddock Melanogrammus aeglefinus and cod Gadus morhua were the most abundant species, however, the species composition and the relative abundances of the species varied with depth, season and between years. Comparisons with a large-scale bottom trawl survey data suggested highly dynamic and species-specific interactions between fish movements, changing environmental conditions and the physical presence of an offshore platform. Given the number of platforms currently installed across the North Sea, there is a need to identify biological mechanisms behind such dynamic interactions. PMID:25965149

  2. The Future of Offshore Wind Energy

    E-print Network

    Firestone, Jeremy

    in the waters around Europe #12;4 US Offshore Wind Projects Proposed Atlantic Ocean Gulf of Mexico Cape Wind1 The Future of Offshore Wind Energy #12;2 #12;3 Offshore Wind Works · Offshore wind parks: 28 in 10 countries · Operational since 1991 · Current installed capacity: 1,250 MW · Offshore wind parks

  3. State-of-the-art and Development Needs of Simulation Codes for Offshore Wind Turbines

    Microsoft Academic Search

    Patrik Passon; Martin Kühn

    Offshore wind turbines have been installed in increasing water depths over the last years. Support structures with monopile or gravity based foundation could successfully be used for all realized offshore-projects, but the trend of increasing water depths reached a level that makes application of those relatively simple types of support structures inappropriate. New concepts like tripods or lattice types are

  4. Image processing in offshore engineering

    SciTech Connect

    Rodriguez, M.V.R.; A. Oliveira, M. de; Almeida, M.E.T. de; Lorenzoni, C. [Petrobras-DEPRO, Rio de Janeiro (Brazil); Ferrante, A.J. [ISC Italia, Milano (Italy)

    1995-12-31

    The technological progress which has taken place during the last decade introduced a totally new outlook regarding the professional computational environment in general, and regarding the engineering profession in particular. During many years engineering computing was performed based on large computer centers, getting bigger and bigger all the time, going from mainframes to super computers, essentially producing numerical results on paper media. Lately, however, it has been realized that a much more productive computational environment can be implemented using an open architecture of client/server type, based on smaller lower cost equipment including workstations and PC`s, and considering engineering information in a broader sense. This papers reports briefly the experience of the Production Department of Petrobras in transforming its centralized, mainframe based, computational environment into a open distributed client/server computational environment, focusing on the problem of handling technical graphics information regarding its more than 70 fixed offshore platforms.

  5. An analytical study and systematic monitoring procedure developed for the load-out operation of the North Rankin Jacket 'A'

    SciTech Connect

    Ferguson, N.; Inokoshi, O.; Kitani, T.; Masuda, S.; Zarate, H.

    1983-05-01

    The loadout of the 22,000 tonnes North Rankin Jacket 'A' onto a floating barge was successfully accomplished in April, 1982. During the loadout the barge ballast was continually adjusted to compensate for both jacket weight transfer onto the barge and full tide variation. The preparation for the loadout and the operation itself was characterized by newly developed integrated techniques. The techniques included: the development of a barge, jacket and quayside three-dimensional computer model to check the validity of conventional and simple ballast system software. The model was also used to evaluate the control parameters of the operation in a series of analyses which determine the sensitivity of critical steps of the operation to human or equipment errors: the development and operation of an integrated control system for jacket load transfer that relates jacket position to barge level and ballast pump requirements; the development and operation of a tide-expectation computer programme and associated ballast pump time scheduling software to compensate for differences between actual water level and that determined from standard tide tables, and to minimize the effect of short-term, local tide variations that are not forecast; and the incorporation of fail-safe concepts and measures into the operation.

  6. Wind energy's promise, offshore

    Microsoft Academic Search

    TERRI BOOKMAN

    2005-01-01

    In November 2001, Cape Wind Associates, a Boston-based energy development firm, began the permitting application process with the U.S. Army Corps of Engineers to build the first offshore wind farm in the United States. The historical context and significance of the application, and of its continuing review process, is profound. On a global level looms ever-increasing evidence and recognition of

  7. Is more IT offshoring better?

    Microsoft Academic Search

    Ajay Bhalla; ManMohan S. Sodhi; Byung-Gak Son

    2008-01-01

    We explore the link between a company's performance and the extent of its offshoring of IT-enabled services, focusing on large western companies. Our performance measures comprise sales, profit as percentage of sales, profit\\/employee and sales\\/employee over 1999–2004. To measure offshoring, we consider the extent to which these companies have offshored: (1) software development and other IT-related development and maintenance, (2)

  8. Experiment study on FLOATING JACKET: a new concept for deep water platform design 

    E-print Network

    Xu, Yufeng

    1996-01-01

    /ballast tank deeply submerged below the ocean surface. This concept offers many attractive features. Model testing of the FJ was performed in Offshore Technology Research Center (OTRC). The responses of the FJ under regular waves and 100-year storm...

  9. Offshore~WMEP - Monitoring offshore wind energy use

    Microsoft Academic Search

    P. Lyding; S. Faulstich; B. Hahn; D. Callies

    Offshore wind energy use is commonly suggested to play an important role in future electricity supply. However, long-term experience with thousands of onshore wind turbines explicitly hint on possible barriers for a save, efficient, economic and user friendly supply relying on offshore wind energy. A national German programme shall on the one hand support the wind energy branch improving technology

  10. Frequency Domain Load Calculation for Offshore Wind Turbines (TURBU Offshore)

    Microsoft Academic Search

    T. G. van Engelen

    The design of offshore wind turbines requires to assess a huge amount of different sea-states and wind conditions. Therefor the calculational efficiency of a comb ined time\\/frequency domain approach is attractive. This was the reason for the development of the frequency domain tool TURBU Offshore. In addition, such a tool is very feasible for parameter studies; the dynamics of large

  11. Model test of wave forces on a structurally dense jacket platform

    SciTech Connect

    Gu, G.Z.; Parsley, M.A.; Berek, E.P.; Calvo, J.J.; Johnson, R.C.; Petruska, D.J. [Mobil Technology Co., Dallas, TX (United States)

    1996-12-31

    In the Gulf of Mexico, there are a significant number of jacket platforms built in the 1950`s and 60`s which are still in operation. Typically, these platforms have a large number of closely spaced legs and densely arranged bracing members. Since most of these platforms are beyond their design lives but the reservoirs are still producing, their safety, serviceability and fitness-for-purpose must be re-assessed in order to continue producing from them. During Mobil`s in-house re-qualification effort, it was found that the predictions by structural analysis programs (such as SACS and KARMA) were inconsistent with the platform inspection results. The programs predicted a large number of joint can failures during design storms (such as hurricane Andrew), but underwater inspections indicated only few failures had actually occurred. It was apparent that the procedure used for the assessment was conservative--either the wave loads the platforms experienced during the hurricanes were overestimated and/or the structural resistances were underestimated. This paper addresses the wave load issue. To calibrate the force algorithms typically used in structural analysis programs, a model test of a typical aging jacket platform was conducted in the wave basin.

  12. Dear Jacket Guardian User, The Georgia Institute of Technology is providing a new safety tool for the campus community. As an affiliate

    E-print Network

    Srinivasarao, Mohan

    Dear Jacket Guardian User, The Georgia Institute of Technology is providing a new safety tool to the Georgia Tech Police Department (GTPD) in emergency situations. In order to use Jacket Guardian, a service with GTPD. Sincerely, Teresa Crocker, Chief Georgia Tech Police Department #12;

  13. A Drilling Model for Young Offshore Louisiana and Texas Trends

    Microsoft Academic Search

    D. A. Smalling

    1988-01-01

    A new type of model specifically designed to aid in the planning and drilling of young offshore Louisiana and Texas wells is presented. The model is composed of functions to represent changing drilling mechanics, as well as changing drillabilities with respect to depth, area, and formation type.

  14. Airborne sound propagation over sea during offshore wind farm piling.

    PubMed

    Van Renterghem, T; Botteldooren, D; Dekoninck, L

    2014-02-01

    Offshore piling for wind farm construction has attracted a lot of attention in recent years due to the extremely high noise emission levels associated with such operations. While underwater noise levels were shown to be harmful for the marine biology, the propagation of airborne piling noise over sea has not been studied in detail before. In this study, detailed numerical calculations have been performed with the Green's Function Parabolic Equation (GFPE) method to estimate noise levels up to a distance of 10?km. Measured noise emission levels during piling of pinpiles for a jacket-foundation wind turbine were assessed and used together with combinations of the sea surface state and idealized vertical sound speed profiles (downwind sound propagation). Effective impedances were found and used to represent non-flat sea surfaces at low-wind sea states 2, 3, and 4. Calculations show that scattering by a rough sea surface, which decreases sound pressure levels, exceeds refractive effects, which increase sound pressure levels under downwind conditions. This suggests that the presence of wind, even when blowing downwind to potential receivers, is beneficial to increase the attenuation of piling sound over the sea. A fully flat sea surface therefore represents a worst-case scenario. PMID:25234870

  15. Experiments on an offshore platform model by FBG sensors

    NASA Astrophysics Data System (ADS)

    Li, Dongsheng; Li, Hongnan; Ren, Liang; Sun, Li; Zhou, Jing

    2004-07-01

    Optical fiber sensors show superior potential for structural health monitoring of civil structures to ensure their structural integrity, durability and reliability. Apparent advantages of applying fiber optic sensors to a marine structure include fiber optic sensors" immunity of electromagnetic interference and electrical hazard when used near metallic elements over a long distance. The strains and accelerations of the newly proposed model of a single post jacket offshore platform were monitored by fiber Bragg grating (FBG) sensors. These FBG sensors were attached to the legs and the top of the platform model in parallel with electric strain gauges or traditional piezoelectric accelerometers, respectively. Experiments were conducted under a variety of loading conditions, including underwater base earthquake simulation dynamic tests and static loading tests. Underwater seismic shaking table was utilized to provide the appropriate excitations. The natural frequencies measured by the FBG accelerometer agree well with those measured by piezo-electrical accelerometers. The monitoring network shows the availability of applying different fiber optic sensors in long-distance structural health monitoring with frequency multiplexing technology. Finally, the existing problems of packaging, strain transferring ratio between the bare fiber and the host structure on which the fiber embedded, and installation and protection of fiber optic sensors are emphasized.

  16. Single and dual lift analyses of offshore structures

    SciTech Connect

    Sekita, K.; Kimura, H.

    1984-02-01

    At offshore job sites today, decks are lifted onto jacket structures in relatively large, heavy sections. Since lifting operations are greatly affected by the motions of the derrick barge or the crane ship, it is necessary to evaluate the sling system in consideration of vessel motions in order to regulate lifting operations at the job site. This paper proposes a static analysis method for designing sling systems and describes the application of this method to dual-lift operations carried out by two derrick crane barges in Southeast Asian waters. This paper also presents the methods of analyzing the motions of a hoisted load caused by wave-induced vessel motions and resulting dynamic sling tensions in single- and dual-lift operations. Single-lift, unified analysis -- a method that considers the interaction between the barge and the hoisted load -- is discussed, and calculated results are compared with 1/75-scale model test results to clarify the conditions necessary for unified analysis. Finally, the results of transient motion analysis for a barge crawling while lifting a load are compared with model test results.

  17. Floating offshore structure

    SciTech Connect

    Oshima, M.; Narita, H.; Tabuchi, H.; Yashima, N.

    1985-05-28

    A floating offshore structure which is moored at a fixed position on the sea by means of mooring hawsers and anchors connected to the ends thereof respectively for conducting a submarine excavating operation from a deck of the structure. The structure includes a moorage hull part provided with a vertical through-hole formed therein for receiving an excavating drill pipe and the mooring hawsers and a movable hull part connected to the moorage hull part so as to be rotatable within a horizontal plane. The movable hull part is constituted as a hull defining the outer wall of the floating offshore structure and connected with the moorage hull part by inserting it into a moorage hull part receiving hole formed at a position closer to the bow thereof. The movable hull part has near its water plane a horizontal section with a substantially oval shape formed by a fore draft part in a substantially circular or polygonal shape, with the moorage hull part receiving hole as a center and an after draft part taperingly projecting aft from the fore draft part.

  18. Design Considerations for Monopile Founded Offshore Wind Turbines Subject to Breaking Waves 

    E-print Network

    Owens, Garrett Reese 1987-

    2012-11-26

    DESIGN CONSIDERATIONS FOR MONOPILE FOUNDED OFFSHORE WIND TURBINES SUBJECT TO BREAKING WAVES A Thesis by GARRETT REESE OWENS Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment... Farms ...... 4 Figure 2 Overview of Offshore Wind Turbine Terminology................................. 7 Figure 3 Overturning Moment as a Function of Water Depth ............................... 10 Figure 4 Types of Breaking Waves...

  19. Putting on and Removing Coats and Jackets: The Acquisition and Maintenance of Skills by Children with Severe Multiple Disabilities.

    ERIC Educational Resources Information Center

    Reese, Gail M.; Snell, Martha E.

    1991-01-01

    A system of graduated guidance was used to teach three children (ages six through nine) with severe multiple disabilities to don and remove their jackets and coats independently. The training approach involved initial use of oversized garments, fading of guidance, and individualized reinforcement. Skill maintenance and generalization were also…

  20. Response analysis of offshore systems to nonlinear random waves: Response statistics

    SciTech Connect

    Kareem, A.; Tognarelli, M.A. [Univ. of Notre Dame, IN (United States). Dept. of Civil Engineering and Geological Sciences; Hsieh, C.C. [Univ. of Houston, TX (United States)

    1996-12-31

    This paper details an investigation of the probabilistic response characteristics of jacket-type platforms in deep water which are subjected to both linear and nonlinear random wave loadings. Unlike earlier analytical treatments of this class of system, a statistical description of the wave forces according to the Morison equation is first developed to reflect nonlinearities and non-Gaussianity in the wave field kinematics. Subsequently, the deck response resulting particularly due to the effects of the second-order contribution to the loads imparted on an idealized platform up to the mean water level is studied via frequency domain analysis. Further, consideration is given to the importance of the spacing of the legs to the response of a typical jacket-type structure. Finally, numerical examples for the case of an idealized jacket platform in deep water amidst three distinct sea states compare responses computed with and in the absence of wave field nonlinearities for a range of leg spacings and illustrate the importance of including the effects of nonlinearities for making more accurate predictions of response statistics in design analyses. Two of the sea states are characterized by locally wind-generated waves modelled by singly-moded JONSWAP spectra. The third is represented by a bi-modal Ochi-Hubble spectrum which additionally incorporates the effects of swell. Findings indicate that ignoring the nonlinearity of the waves in the forcing process results in underestimation of the response level for all sea states.

  1. Discrimination of Bullet Types Using Analysis of Lead Isotopes Deposited in Gunshot Entry Wounds

    Microsoft Academic Search

    Klintean Wunnapuk; Takeshi Minami; Piya Durongkadech; Setsuko Tohno; Werawan Ruangyuttikarn; Yumi Moriwake; Karnda Vichairat; Pongruk Sribanditmongkol; Yoshiyuki Tohno

    2009-01-01

    In order to discriminate bullet types used in firearms, of which the victims died, the authors investigated lead isotope ratios\\u000a in gunshot entry wounds from nine lead (unjacketed) bullets, 15 semi-jacketed bullets, and 14 full-jacketed bullets by inductively\\u000a coupled plasma-mass spectrometry. It was found that the lead isotope ratio of 207\\/206 in gunshot entry wounds was the highest\\u000a with lead

  2. Proceedings of the 25th annual offshore technology conference. Volume 2 - Platform and marine system design

    SciTech Connect

    Not Available

    1993-01-01

    This is volume 2 of a 4 volume set of conference proceedings dealing with offshore development of mineral resources. This particular conference centers around the design, construction, and installation of offshore platforms and underwater pipelines. It contains papers which discuss retrofitting of various types of platforms to meet current safety standards. It also discusses design criteria used to minimize wave motion in offshore platforms, moorings, and various types of support facilities. Papers also describe methods for welding joints in both platforms and pipelines. Many papers specifically address economic aspects of offshore development and the cost of complying with increasing safety regulations and standards. A few papers also deal directly with engineered safety systems as they apply to offshore platforms.

  3. Offshoring and Directed Technical Change

    E-print Network

    Acemoglu, Daron

    2012-11-24

    To study the short-run and long-run implications on wage inequality, we introduce directed technical change into a Ricardian model of offshoring. A unique final good is produced by combining a skilled and an unskilled ...

  4. Methane Seeps along Offshore Virginia

    USGS Multimedia Gallery

    Numerous distinct methane streams emanating from the seafloor at an upper slope (< 500 m water depth) cold seep site offshore Virginia. Image courtesy of NOAA Okeanos Explorer Program, 2013 Northeast U.S. Canyons Expedition....

  5. Coupled dynamic analysis of floating offshore wind farms 

    E-print Network

    Shim, Sangyun

    2009-05-15

    dynamic analysis of an offshore floating wind turbine system including blade-rotor dynamics and platform motions. As a test case, the TLP-type floater system with 3 blades of 70-m diameter designed by the National Renewable Energy Laboratory (NREL...

  6. Determinants of perceived occupational stress among Chinese offshore oil workers

    Microsoft Academic Search

    Wei-qing Chen; Tze-wai Wong; Tak-sun Yu; Yan-zu Lin; Cary L. Cooper

    2003-01-01

    This is the first comprehensive study to explore the determinants of perceived sources of occupational stress among workers in the rapidly expanding Chinese offshore oil industry. In this study we surveyed 561 Chinese workers in a state-owned oil company using a questionnaire that measured occupational stress and Type A personality behaviour (TABP), social support and other socio-demographic data. Occupational stress

  7. Offshore Wind Energy Market Overview (Presentation)

    SciTech Connect

    Baring-Gould, I.

    2013-07-01

    This presentation describes the current international market conditions regarding offshore wind, including the breakdown of installation costs, how to reduce costs, and the physical siting considerations considered when planning offshore wind construction. The presentation offers several examples of international existing and planned offshore wind farm sites and compares existing international offshore resources with U.S. resources. The presentation covers future offshore wind trends and cites some challenges that the United States must overcome before it will be able to fully develop offshore wind sites.

  8. Reassessment of offshore platforms

    SciTech Connect

    Nair, V.V.D.; Kuhn, J.M. (Mobil Research and Development Corporation, Dallas, TX (United States))

    1993-05-01

    Data from Hurricane Andrew demonstrated that the systems and procedures in place for evacuating offshore workers and minimizing oil spills and environmental damage functioned as planned. While the vast majority of the platforms survived the storm with no damage, a few of the older platforms (installed prior to 1972) either collapsed or suffered severe damage. The collapsed platforms were designed with insufficient deck height to clear the storm waves. In recent years, the API RP 2A has introduced guidance for minimum air gap, minimum structures, platform inspection and platform reuse. These provisions, coupled with natural attribution of the older platforms, will significantly improve the performance of platforms in the future. The reliability of NDT techniques to detect major structural defects should be improved through continued research. While flooded member detection is used by several operators as a screening tool to detect major defects underwater, its reliability is not always good and further research is needed in this area. Another area of high priority research is related to the use of Remotely Operated Vehicles (ROV) to perform underwater inspection of structures. 51 refs., 7 figs.

  9. Combination offshore drilling rig

    SciTech Connect

    Lorenz, D.B.; Laid, J.S. II

    1986-07-29

    An offshore drilling rig is described for use in drilling into a formation below a body of water comprising a barge hull having a drilling slot extending inwardly from the peripheral boundary of the barge hull, means for supporting the barge hull in a position above the water, a cantilever structure mounted on the barge hull and movable horizontally with respect to such barge hull, the cantilever structure being so located relative to the drilling slot as to be movable horizontally into a position in vertical alignment with the drilling slot, a derrick and drilling machinery mounted to the cantilever structure and movable into a position above the drilling slot whereby well drilling operations may be conducted through the drilling slot, the cantilever structure also being movable horizontally to a position which locates the derrick and the drilling machinery outboard of the peripheral boundary of the barge hull, whereby a drilling operations may be conducted outside of the peripheral boundary of the barge hull, means mounted on the barge hull for moving the cantilever structure horizontally to different positions relative to the barge hull.

  10. Structure for offshore exploitation

    SciTech Connect

    Gerwick, B.C. Jr.; Hatcher, S.J.

    1984-02-28

    A structure is disclosed for use in exploiting arctic offshore areas where floating ice masses may be present. The structure is comprised of a floating hull having ice-breaking capabilities which is moored by a plurality of mooring means which extend vertically from a moonpool in the hull to the marine bottom directly under the hull. The mooring means comprises flexible lines, e.g. nylon, steel, or the like or rigid conduits, e.g. drill pipe. Means are provided within the moonpool for tensioning the mooring means to thereby draw the hull downward to a position below its normal buoyant position thereby substantially eliminating vertical heaving of the hull. When an ice mass contacts the hull, tension on the mooring means is relaxed to thereby allow the hull to rock upward against the ice thereby generating the forces necessary for the ice-breaking operation. Due to the present mooring means, the hull moves only a relatively short lateral distance in breaking an approaching ice mass. This is important in floating drilling operations. Further, if repair or replacement of a mooring means is required, this can be accomplished even when ice surrounds the hull since the mooring means are anchored directly below the hull and are easily accessible through the moonpool.

  11. Keeping earnings offshore

    SciTech Connect

    Martin, K.; Malkani, S. (Chadbourne Parke, Washington, DC (United States))

    1994-04-01

    Two IRS designations determine the taxation status for non-U.S. projects. For developers, understanding these designations is an important business concern. A PFIC (passive foreign investment company) is something to avoid. A CFC (controlled foreign corporation) may be good or bad, depending on the circumstances. These are lables that the US tax authorities put on certain foreign corporations. Anyone working on projects in other countries should be able to recognize them, not only because they may defeat his objective of keeping money offshore, but also because there are additional consequences from operating through a foreign corporation that the Internal Revenue Service (IRS) has labeled a PFIC or CFC. Return on investment may be lower than expected, and the developer may need to be more careful than otherwise not to pledge the stock of the foreign corporation as security for borrowing by the parent company in the United States or take other actions that might be viewed as putting income or assets of the foreign corporation to use here.

  12. Zinc recovery from the water-jacket furnace flue dusts by leaching and electrowinning in a SEC-CCS cell

    Microsoft Academic Search

    Tshikele Mukongo; Kasonde Maweja; Bilali wa Ngalu; Ilunga Mutombo; Kabamba Tshilombo

    2009-01-01

    Zinc containing flue dusts generated during a copper matte smelting process in a water-jacket furnace was leached in a zinc electrowinning return solution at 55 °C. Ninety percent of the metal was dissolved after 2 h of treatment. The leaching residues contained near 43 wt.% PbSO4.Iron was removed from leaching solutions by precipitation using a saturated lime solution at pH 3–4. The precipitate

  13. Metallurgical considerations of the high yield to ultimate ratio in high strength steels for use in offshore engineering

    SciTech Connect

    Healy, J.; Billingham, J. [Cranfield Univ. (United Kingdom)

    1995-12-31

    High strength steels are increasingly being specified for offshore applications primarily on topsides, but also more recently in jackets themselves. Compared with conventional structural steels, modem high strength steels possess higher yield ratios (YR). This has caused some concern and debate on their work hardening capacity and moreover, current material specification and design codes severely penalize their use by placing limits on YR and on allowable design stress. Many changes have occurred in steel processing and alloying methods over the past 15 years or so, to produce higher strength steels with increased toughness yet utilizing leaner chemistries to enhance weldability. High strength steels in the range 355--550MPa are likely to be increasingly used in future offshore applications and the current paper, although concerned with studies aimed specifically to assess the importance of variations in YR, also presents an overview of typical mechanical properties possessed by such steels. In general, the actual yield strength of steel plates exceeds the SMYS by a significant margin, sometimes by as much as 100MPa, which has important implications for material selection, design procedures and welding considerations. In general, as the yield strength increases, so also does the YR. However, despite possessing high YR values, modem steels maintain high levels of combined toughness, ductility and weldability. Variability in mechanical properties can be correlated with parameters such as particular steel manufacturer and production route, composition, and plate thickness. It has been demonstrated that some manufacturers can exert closer control on variability in properties, thereby consistently satisfying current offshore requirements.

  14. Offshore Aquaculture in the United States

    E-print Network

    Offshore Aquaculture in the United States: Economic Considerations, Implications & Opportunities from: http://aquaculture.noaa.gov This document should be cited as follows: Rubino, Michael (editor). 2008. Offshore Aquaculture in the United States: Economic Considerations, Implications & Opportunities

  15. Design considerations for offshore oil rig cathodic protection

    Microsoft Academic Search

    D. J. Tighe-Ford; J. N. McGrath

    1993-01-01

    The rational design of cathodic protection (CP) configurations for jackets is addressed in the context of large, open, complex, multi-component structures. The approach is illustrated by an impressed current CP (ICCP) design study, employing physical scale modeling for the selection of the numbers and locations of zones, anodes, and reference electrodes for a relatively simple unpainted jacket under static conditions.

  16. A Simple Model of Offshore Outsourcing,

    E-print Network

    Paris-Sud XI, Université de

    A Simple Model of Offshore Outsourcing, Technology Upgrading and Welfare Jaewon JUNG THEMA Simple Model of Offshore Outsourcing, Technology Upgrading and Welfare Jaewon Jung and Jean Mercenier in the North as making explicit offshore outsourcing decisions to cheap-labor economies. Globalization results

  17. The politics and economics of offshore outsourcing

    Microsoft Academic Search

    N. Gregory Mankiw; Phillip Swagel

    2006-01-01

    This paper reviews the political uproar over offshore outsourcing connected with the release of the Economic Report of the President (ERP) in February 2004, examines the differing ways in which economists and non-economists talk about offshore outsourcing, and assesses the empirical evidence on the importance of offshore outsourcing in accounting for the weak labor market from 2001 to 2004. Even

  18. Virtual workgroups in offshore systems development

    Microsoft Academic Search

    Sachidanandam Sakthivel

    2005-01-01

    The market for offshore systems development, motivated by lower costs in developing countries, is expected to increase and reach about $15 billion in the year 2007. Virtual workgroups supported by computer and communication technologies enable offshore systems development. This article discusses the limitations of using virtual work in offshore systems development, and describes development processes and management procedures amenable to

  19. European offshore oil and gas, 1985

    SciTech Connect

    Not Available

    1985-01-01

    This book discusses the offshore industry, and provides information on every aspect of European offshore activity from basic geological facts to today's licensing and taxation regimes to field by field analysis of exploration and developments. It also contains a directory of European companies supplying services and equipment to offshore industry.

  20. Measuring safety climate on offshore installations

    Microsoft Academic Search

    Kathryn Mearns; Rhona Flin; Rachale Gordon; Mark Fleming

    1998-01-01

    The human and organizational factors affecting safety were examined on 10 offshore installations using the Offshore Safety Questionnaire. The questionnaire contained scales measuring work pressure and work clarity, job communication, safety behaviour, risk perception, satisfaction with safety measures and safety attitudes. A total of 722 UK offshore workers (33% response rate) from a range of occupations completed and returned the

  1. OFFSHORE ARCTIC PIPELINE OIL SPILL RISK ASSESSMENT

    Microsoft Academic Search

    A. Dinovitzer; R. Lazor; D. Hinnah

    2004-01-01

    While offshore arctic pipelines have been under consideration for more than 25 years, few have been built. Renewed interest in offshore arctic oil and gas has necessitated the design of pipelines capable of both overcoming the technical challenges of the arctic offshore environment and minimizing the risk to it. This paper describes a quantitative risk assessment completed by BMT Fleet

  2. Cost of Offshore Wind Energy Charlene Nalubega

    E-print Network

    Mountziaris, T. J.

    and Industrial Engineering The focus of my research is to estimate the cost of floating offshore wind turbines turbines in shallow water or in the target location, we will model a system where the wind turbine turbines have evolved to be offshore. Offshore wind turbines generate more electricity because

  3. Towers for Offshore Wind Turbines

    Microsoft Academic Search

    V. J. Kurian; S. P. Narayanan; C. Ganapathy

    2010-01-01

    Increasing energy demand coupled with pollution free production of energy has found a viable solution in wind energy. Land based windmills have been utilized for power generation for more than two thousand years. In modern times wind generated power has become popular in many countries. Offshore wind turbines are being used in a number of countries to tap the energy

  4. Dynamic analysis of tension leg platform for offshore wind turbine support as fluid-structure interaction

    Microsoft Academic Search

    Hu Huang; She-Rong Zhang

    2011-01-01

    Tension leg platform (TLP) for offshore wind turbine support is a new type structure in wind energy utilization. The strong-interaction\\u000a method is used in analyzing the coupled model, and the dynamic characteristics of the TLP for offshore wind turbine support\\u000a are recognized. As shown by the calculated results: for the lower modes, the shapes are water’s vibration, and the vibration

  5. Detection of QTc interval prolongation using jacket telemetry in conscious non-human primates: comparison with implanted telemetry

    PubMed Central

    Derakhchan, K; Chui, RW; Stevens, D; Gu, W; Vargas, HM

    2014-01-01

    Background and Purpose:?During repeat-dose toxicity studies, ECGs are collected from chemically or physically-restrained animals over a short timeframe. This is problematic due to cardiovascular changes caused by manual restraint stress and anesthesia, and limited ECG sampling. These factors confound data interpretation, but may be overcome by using a non-invasive jacket-based ECG collection (JET). The current study investigated whether a jacketed external telemetry system could detect changes in cardiac intervals and heart rate in non-human primates (NHPs), previously implanted with a PCT transmitter. Experimental Approach:?Twelve male cynomolgus monkeys were treated weekly with vehicle or sotalol (8, 16, 32?mg kg?1) p.o. ECGs were collected continuously for 24 hours, following treatment, over 4 weeks. A satellite group of six NHPs was used for sotalol toxicokinetics. Key Results:?Sotalol attained Cmax values 1–3 hours after dosing, and exhibited dose-proportional exposure. In jacketed NHPs, sotalol dose-dependently increased QT/QTc intervals, prolonged PR interval, and reduced heart rate. Significant QTc prolongation of 27, 54 and 76 msec was detected by JET after 8, 16, and 32?mg kg?1 sotalol, respectively, compared with time-matched vehicle-treated animals. Overall, JET-derived PR, QT, QTc intervals, QRS duration, and heart rate correlated well with those derived from PCT. Conclusions and Implications:?The current findings clearly support the use of JET to quantify cardiac interval and rhythm changes, capable of detecting QTc prolongation caused by sotalol. JET may be a preferred method compared to restraint-based ECG because high-density ECG sampling can be collected in unstressed conscious monkeys, over several weeks. PMID:24372552

  6. Numerical experiments in ringing of offshore systems under viscous loads

    SciTech Connect

    Gurley, K.R.; Kareem, A. [Univ. of Notre Dame, IN (United States)

    1996-12-31

    A phenomenon which has recently received much attention in offshore engineering is the ringing response of structures. This high frequency transient type response has been observed in nature, particularly in tension leg platforms (TLPs). Given the implications of this behavior on the fatigue life of tendons, it is important that it be considered for response analysis. Significant progress has been made in recent years in identifying the nonlinear mechanisms that induce ringing in complex offshore structural systems. This introductory study-uses a simple model to numerically demonstrates several of the more salient features that are commonly cited in current literature, and shows that viscous loads may result in inducing ringing type response of members under certain conditions. Ringing response in pitch due to viscous loading is simulated on a column piercing the surface, and the significant contributing force mechanisms are identified. System characteristics are altered to ameliorate the performance of these systems.

  7. Stress and accidents in the offshore oil and gas industry

    SciTech Connect

    Sutherland, V.J.; Cooper, C.L.

    1991-01-01

    This book is a comprehensive analysis of occupational stress and accidents among personnel working in the European offshore oil and gas industry. Identifies sources of stress and predicts stressor outcomes. Examines job dissatisfaction, mental well-being and their relation to accidents. Also explores the differences within occupational status (operator versus contractor) and type of installation (drilling rigs versus fixed production platforms). Conclusions presented include the growing need for extensive management involvement, responsibility, and understanding in this exceptionally high environmental stress industry.

  8. Fatigue handbook: Offshore steel structures

    SciTech Connect

    Almarnaess, A.

    1985-01-01

    The contents of this book are: Overview of Offshore Steel Structures; Loads on Ocean Structures; Fracture Mechanics As a Tool in Fatigue Analysis; Basic Fatigue Properties of Welded Joints; Significance of Defects; Improving the Fatigue Strength of Welded Joints; Effects of Marine Environment and Cathodic Protection on Fatigue of Structural Steels Fatigue of Tubular Joints; Unstable Fracture; Fatigue Life Calculations; and Fatigue in Building Codes Background and Applications.

  9. What can wave energy learn from offshore oil and gas?

    PubMed

    Jefferys, E R

    2012-01-28

    This title may appear rather presumptuous in the light of the progress made by the leading wave energy devices. However, there may still be some useful lessons to be learnt from current 'offshore' practice, and there are certainly some awful warnings from the past. Wave energy devices and the marine structures used in oil and gas exploration as well as production share a common environment and both are subject to wave, wind and current loads, which may be evaluated with well-validated, albeit imperfect, tools. Both types of structure can be designed, analysed and fabricated using similar tools and technologies. They fulfil very different missions and are subject to different economic and performance requirements; hence 'offshore' design tools must be used appropriately in wave energy project and system design, and 'offshore' cost data should be adapted for 'wave' applications. This article reviews the similarities and differences between the fields and highlights the differing economic environments; offshore structures are typically a small to moderate component of field development cost, while wave power devices will dominate overall system cost. The typical 'offshore' design process is summarized and issues such as reliability-based design and design of not normally manned structures are addressed. Lessons learned from poor design in the past are discussed to highlight areas where care is needed, and wave energy-specific design areas are reviewed. Opportunities for innovation and optimization in wave energy project and device design are discussed; wave energy projects must ultimately compete on a level playing field with other routes to low CO? energy and/or energy efficiency. This article is a personal viewpoint and not an expression of a ConocoPhillips position. PMID:22184670

  10. Offshore oil-spill occurrence rates

    Microsoft Academic Search

    Robert P. LaBelle; Cheryl M. Anderson

    1996-01-01

    The U.S. Minerals Management Service maintains statistics on the frequency of offshore oil spills associated with platforms, pipelines, and tanker traffic. Oil-spill occurrence rates have decreased slightly for U.S. offshore platforms, increased for U.S. offshore pipelines, and remained about the same for worldwide tankers (comparing rates calculated through 1992 to rates calculated through the mid-80s). Recently calculated rates are presented

  11. About Hercules Offshore Headquartered in Houston, Texas, Hercules Offshore serves the oil and

    E-print Network

    Fisher, Kathleen

    About Hercules Offshore Headquartered in Houston, Texas, Hercules Offshore serves the oil and gas industry with the largest fleet of mobile drilling platforms in the U.S. Gulf of Mexico, and the fourth exploration, drilling and related maintenance tasks. Hercules Offshore operates in key oil producing sites

  12. 46 CFR 126.170 - Carriage of offshore workers.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...false Carriage of offshore workers. 126.170 Section 126...170 Carriage of offshore workers. (a) Offshore workers may be carried aboard an...meets the applicability and construction requirements of subpart...

  13. 46 CFR 15.520 - Mobile offshore drilling units.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Mobile offshore drilling units. 15.520 Section 15...Vessels § 15.520 Mobile offshore drilling units. (a) The requirements in this section for mobile offshore drilling units (MODUs) supplement other...

  14. 46 CFR 15.520 - Mobile offshore drilling units.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Mobile offshore drilling units. 15.520 Section 15...Vessels § 15.520 Mobile offshore drilling units. (a) The requirements in this section for mobile offshore drilling units (MODUs) supplement other...

  15. 46 CFR 15.520 - Mobile offshore drilling units.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Mobile offshore drilling units. 15.520 Section 15...Vessels § 15.520 Mobile offshore drilling units. (a) The requirements in this section for mobile offshore drilling units (MODUs) supplement other...

  16. 46 CFR 15.520 - Mobile offshore drilling units.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Mobile offshore drilling units. 15.520 Section 15...Vessels § 15.520 Mobile offshore drilling units. (a) The requirements in this section for mobile offshore drilling units (MODUs) supplement other...

  17. The abdominal fascial closure in a double-breasted jacket pattern following a TRAM free flap breast reconstruction.

    PubMed

    Kim, Young Seok; Yoo, Han-Su; Hong, Jong Won; Lew, Dae hyun; Roh, Tai Suk

    2014-02-01

    The primary closure of abdominal fascia after breast reconstruction with transverse rectus abdominis myocutaneous (TRAM) flap has been reported to be the most effective way to reduce these complications. A total of 108 patients who underwent immediate unilateral breast reconstruction with muscle-sparing TRAM flap were included in the study. We compared complications between 56 patients who underwent conventional primary fascial closure (group 1) and 52 who underwent fascial closure in a new double-breasted jacket pattern (group 2), retrospectively. Abdominal bulging occurred in four patients (7.1%) in group 1 and one patient (1.9%) in group 2 (p?=?0.01). An abdominal wound dehiscence occurred in three (5.4%) patient in group 1 and two (3.8%) patient in group 2 (p?=?0.12). After conventional or muscle-sparing TRAM free flap reconstruction, closing the abdominal fascia in a double-breasted jacket pattern can help reinforce the lower abdominal fascia and prevent abdominal bulging caused by abdominal fascia tensional imbalance. PMID:24399696

  18. Infauna Monitoring Horns Rev Offshore Wind Farm

    E-print Network

    #12;Infauna Monitoring Horns Rev Offshore Wind Farm Annual Status Report 2004 Published: 21 April-2004................................................. 48 Wind farm area (Turbine), Reference area (Ref

  19. Vessel movement influences offshore communications system design

    SciTech Connect

    Holcomb, S.R. [Brown and Root Inc., Houston, TX (United States); Burger, S.D. [Amoco Orient Production Co., Chiwan (China)

    1996-05-27

    Communications links for the Liuhua 11-1 oil production project, offshore China, required a system that would function with vessel movement under typhoon conditions of heavy rainfall and extreme wave action. The system includes a microwave path between two floating production facilities and a satellite connection between the offshore facilities and onshore China. The system provides multiple local-area-network (LAN) linkages, and voice with fax in English and Chinese. The satellite link has a geostabilized platform offshore and a China National Offshore Oil Corp. master earth station onshore. System operations started in mid-1995. This paper reviews the design and performance of this communications network.

  20. Offshore wind resource assessment through satellite images

    E-print Network

    1 Slide no. 4 Offshore wind resource assessment through satellite images Charlotte Bay Hasager images for offshore wind ressource assessment in lieu of in-situ mast observations #12;4 Slide no 2001 i.e. prior to construction of the wind farm 19991019 Footprint averaging per scene #12;1 0 Slide

  1. Offshore Wind Turbines: Some Technical Challenges

    E-print Network

    Houlsby, Guy T.

    1 Offshore Wind Turbines: Some Technical Challenges Prof. Guy Houlsby FREng Oxford University House engineers concerned with installation of offshore wind turbines. The author is Professor of Civil solved, a DTI and EPSRC-sponsored research programme on foundations for wind turbines will be briefly

  2. Seepage in Vietnam — onshore and offshore examples

    Microsoft Academic Search

    J. J. Traynor; Chris Sladen

    1997-01-01

    Hydrocarbon seepages in Vietnam are generally linked to migration from Tertiary source rocks, and seeps are present both onshore and offshore.Residual oil can be observed at outcrop in breached traps within Tertiary sections and in exhumed ‘buried hill’ traps in pre-Tertiary rocks in the onshore Hanoi Basin. There is active oil seepage on the western margin of the offshore Phu

  3. Oil and gas exploration, offshore southern California

    Microsoft Academic Search

    Wallis

    1981-01-01

    Four local Tertiary basins comprise the regional Pacific Basin south of Point Conception: the San Diego trough and the offshore Los Angeles, Outer Banks, and Ventura-Santa Barbara Channel Basins. The San Diego trough has not been tested by deep wells. The offshore Los Angeles Basin produces oil and gas from Neogene sandstones in giant oil fields which extend on shore.

  4. 44 MArch 2006 Can offshore aquaculture

    E-print Network

    Miami, University of

    44 MArch 2006 Can offshore aquaculture of carnivorous fish be sustainable? Case studies from and pollution concerns sug- gest that major environmental benefits are to be gained by moving cage aquaculture development of offshore aquaculture through university-industry-government partnerships. Emerging technology

  5. Aeroelastic Modeling of Offshore Turbines and Support Structures in Hurricane-Prone Regions (Poster)

    SciTech Connect

    Damiani, R.

    2014-03-01

    US offshore wind turbines (OWTs) will likely have to contend with hurricanes and the associated loading conditions. Current industry standards do not account for these design load cases (DLCs), thus a new approach is required to guarantee that the OWTs achieve an appropriate level of reliability. In this study, a sequentially coupled aero-hydro-servo-elastic modeling technique was used to address two design approaches: 1.) The ABS (American Bureau of Shipping) approach; and 2.) The Hazard Curve or API (American Petroleum Institute) approach. The former employs IEC partial load factors (PSFs) and 100-yr return-period (RP) metocean events. The latter allows setting PSFs and RP to a prescribed level of system reliability. The 500-yr RP robustness check (appearing in [2] and [3] upcoming editions) is a good indicator of the target reliability for L2 structures. CAE tools such as NREL's FAST and Bentley's' SACS (offshore analysis and design software) can be efficiently coupled to simulate system loads under hurricane DLCs. For this task, we augmented the latest FAST version (v. 8) to include tower aerodynamic drag that cannot be ignored in hurricane DLCs. In this project, a 6 MW turbine was simulated on a typical 4-legged jacket for a mid-Atlantic site. FAST-calculated tower base loads were fed to SACS at the interface level (transition piece); SACS added hydrodynamic and wind loads on the exposed substructure, and calculated mudline overturning moments, and member and joint utilization. Results show that CAE tools can be effectively used to compare design approaches for the design of OWTs in hurricane regions and to achieve a well-balanced design, where reliability levels and costs are optimized.

  6. [Offshore ecosystem health status assessment: a review].

    PubMed

    Dai, Ben-lin; Hua, Zu-lin; Mu, Fei-hu; Xu, Ning; He, Yu-long

    2013-04-01

    With the promotion of the concept of sustainable development, the issues of aquatic ecosystem health attract substantial attention, and considerable work has been carried out on the health assessment of waters, e. g. , rivers and lakes. However, the health assessment of offshore ecosystem is still at its exploratory stage. Based on the investigations on the related references at home and abroad, this paper analyzed the concepts of offshore ecosystem health assessment, summarized the main methods for the assessment, the principles for screening related indicators, and the research philosophy, and systematically listed the quantitative indices for the assessment. Aiming at the main existing issues in the researches of offshore ecosystem health, the future research directions about the offshore ecosystem health were suggested. It was considered that the concept and connotation analyses, the screening of assessment indicators, the choice of assessment scale, and the integration of assessment methods should be further strengthened to improve the assessment of offshore ecosystem health. PMID:23898680

  7. Irruptions of the Sacred in a “World of Shit”: Profanity, Sacred Words, and Cinematic Hierophanies in Stanley Kubrick’s Full Metal Jacket (1987)

    Microsoft Academic Search

    Joseph E. Bisson

    2012-01-01

    Full Metal Jacket remains embedded in the consciousness of the popular culture mainly because of its abundance of profane language, violent imagery, and salacious set pieces. The juxtaposition of profane language and imagery with sacred language and religious symbolism reveals that Kubrick’s Vietnam film has powerful religious overtones that comprise an important element of the film’s critique of homo religiosus

  8. Application of a sealed tube test to the study of degraded insulation resulting from thermal aging of cables with PVC jacket

    Microsoft Academic Search

    M. Exrin; B. Bernstein

    1988-01-01

    The cause of dark amber spots formed in XLPE insulation of thermally aged power distribution cables with PVC (polyvinyl chloride) jacket was studied. Heating tests in sealed glass tubes showed that the spots are due to hydrogen chloride (HCl) evolved by PVC acting at localized sites of transition metals in the insulation. Small slices of insulation were used with controlled

  9. Simplified rotor load models and fatigue damage estimates for offshore wind turbines.

    PubMed

    Muskulus, M

    2015-02-28

    The aim of rotor load models is to characterize and generate the thrust loads acting on an offshore wind turbine. Ideally, the rotor simulation can be replaced by time series from a model with a few parameters and state variables only. Such models are used extensively in control system design and, as a potentially new application area, structural optimization of support structures. Different rotor load models are here evaluated for a jacket support structure in terms of fatigue lifetimes of relevant structural variables. All models were found to be lacking in accuracy, with differences of more than 20% in fatigue load estimates. The most accurate models were the use of an effective thrust coefficient determined from a regression analysis of dynamic thrust loads, and a novel stochastic model in state-space form. The stochastic model explicitly models the quasi-periodic components obtained from rotational sampling of turbulent fluctuations. Its state variables follow a mean-reverting Ornstein-Uhlenbeck process. Although promising, more work is needed on how to determine the parameters of the stochastic model and before accurate lifetime predictions can be obtained without comprehensive rotor simulations. PMID:25583872

  10. Verification of the New FAST v8 Capabilities for the Modeling of Fixed-Bottom Offshore Wind Turbines: Preprint

    SciTech Connect

    Barahona, B.; Jonkman, J.; Damiani, R.; Robertson, A.; Hayman, G.

    2014-12-01

    Coupled dynamic analysis has an important role in the design of offshore wind turbines because the systems are subject to complex operating conditions from the combined action of waves and wind. The aero-hydro-servo-elastic tool FAST v8 is framed in a novel modularization scheme that facilitates such analysis. Here, we present the verification of new capabilities of FAST v8 to model fixed-bottom offshore wind turbines. We analyze a series of load cases with both wind and wave loads and compare the results against those from the previous international code comparison projects-the International Energy Agency (IEA) Wind Task 23 Subtask 2 Offshore Code Comparison Collaboration (OC3) and the IEA Wind Task 30 OC3 Continued (OC4) projects. The verification is performed using the NREL 5-MW reference turbine supported by monopile, tripod, and jacket substructures. The substructure structural-dynamics models are built within the new SubDyn module of FAST v8, which uses a linear finite-element beam model with Craig-Bampton dynamic system reduction. This allows the modal properties of the substructure to be synthesized and coupled to hydrodynamic loads and tower dynamics. The hydrodynamic loads are calculated using a new strip theory approach for multimember substructures in the updated HydroDyn module of FAST v8. These modules are linked to the rest of FAST through the new coupling scheme involving mapping between module-independent spatial discretizations and a numerically rigorous implicit solver. The results show that the new structural dynamics, hydrodynamics, and coupled solutions compare well to the results from the previous code comparison projects.

  11. Offshore federalism: evolving federal-state relations in offshore oil and gas development

    SciTech Connect

    Miller, D.S.

    1984-01-01

    The author examines the standards of consistency that federal activities directly affecting a state's coastal zone must meet with state coastal plans. He proposes a definition of the standard that differs from the rather loose definition proposed by the Ninth Circuit Court. Since the Supreme Court held that Outer Continental Shelf (OCS) lease sales do not directly affect the coastal zone, the proper definition of the term is unresolved. The type of offshore federalism established by a proper interpretation of the Coast Zone Management Act is even more likely to protect the public trust in coastal resources than either exclusive federal or state control of the OCS. If the states are to retain coastal management and OCS decision-making, further Congressional elaboration of the consistency provisions may be necessary.

  12. Quantifying the hurricane risk to offshore wind turbines

    E-print Network

    Jaramillo, Paulina

    Quantifying the hurricane risk to offshore wind turbines Stephen Rosea , Paulina Jaramilloa,1. Turbine tower buckling has been observed in typhoons, but no offshore wind turbines have yet been built be destroyed by hurricanes in an offshore wind farm. We apply this model to estimate the risk to offshore wind

  13. Offshore Wind Farm Layout Optimization (OWFLO) Project: Preliminary Results

    E-print Network

    Massachusetts at Amherst, University of

    , electrical line losses, and turbine availability--with offshore wind farm component cost models present for offshore wind farm developers by creating an analysis tool that unites offshore turbineOffshore Wind Farm Layout Optimization (OWFLO) Project: Preliminary Results Christopher N. Elkinton

  14. Methyl mercury in Lake Superior: Offshore processes and bioaccumulation

    NASA Astrophysics Data System (ADS)

    Hurley, J. P.; Manolopoulos, H.; Babiarz, C. L.; Sakamoto, H.; Rolfhus, K. R.; Back, R. C.; Shafer, M. M.; Armstrong, D. E.; Harris, R.

    2003-05-01

    The effects of watershed type exert a strong influence on the speciation of mercury and the delivery of mercury to Lake Superior nearshore waters. As a consequence, tributary mixing zones are important locations for enhanced bioaccumulation in Lake Superior. Methyl Hg (MeHg) bioaccumulation, however, is also observed in regions of the lake that are remote from tributary influences. Three cruises aboard the USEPA vessel R/VLake Guardian on Lake Superior revealed that offshore concentrations of total mercury (HgT) were low, similar to Lake Michigan and oceanic waters (0.21 1.0 ng L^{-1} HgT). During August 2000, MeHg averaged 3.0 12.6 pg L-, at least an order of magnitude lower than most tributaries during typical flow régimes. Despite these differences, initial comparisons of phytoplankton revealed only a two to threefold enrichment of MeHg in tributary mixing zones versus offshore regions. MeHg inputs to the open waters of the lake are dependent on three processes: mixing from nearshore zones, direct atmospheric inputs and MeHg diffusion from sediments. Direct sedimentary methylation rates are extremely low and modeling efforts suggest that photodegradation would eliminate tributaryderived MeHg. Therefore, we conclude that atmospheric sources strongly influence MeHg uptake in offshore zones. A detailed profile at a deep-lake station in August 2001 suggests enhanced bioaccumulation at a subsurface chlorophyll maximum, in a zone with close contact to atmospheric fluxes.

  15. Cathodic protection of well casings offshore

    SciTech Connect

    Schremp, F.W.

    1982-08-01

    Wells completed from offshore platforms have unique cathodic protection (CP) problems because they are shorted electrically to the platforms. Thus, there is no convenient way to determine how much galvanic or impressed current flows in each well casing system. Also, most platforms are protected with sacrificial anodes, and the depth to which they protect well casings is unknown. Furthermore, there are no established protection criteria applicable to offshore well casings attached to platforms. This study was performed to investigate the effects of galvanic current and impressed current CP on an offshore platform and six wells, and some CP guidelines were established.

  16. Offshore drilling to increase in 1984

    SciTech Connect

    Not Available

    1984-05-01

    A mid-year report presents a worldwide overview of offshore drilling operations. The Gulf of Mexico and the North Sea are posting substantial gains as companies rush to drill the millions of acres acquired in those sectors both last year and in previous offerings. The Middle East, Latin America and the Asia/Pacific offshore theaters will see only slight increases. The Mediterranean and African regions are expected to sustain declines. A region-by-region summary of the 1984 offshore forecast is presented showing exploration and appraisal activities, as well as development for all of these areas.

  17. Certification of offshore mooring steel wire ropes

    SciTech Connect

    Lohne, P.W. [Det Norske Veritas AS, Oslo (Norway)

    1996-12-31

    The trend to produce oil in increasingly deeper water has led to the development of floating production solutions for the exploitation of the energy resources in these areas. It is a fact that steel wire ropes have been used and are being proposed as line segments in the majority of the mooring systems of these units/ships. This paper specifies requirements for the materials, design, manufacture and testing of large diameter offshore mooring steel wire ropes and may serve as a technical reference document in contractual matters between the purchaser and the manufacturer. Typical applications covered are permanently moored floating production systems (FPS), offshore loading systems and mobile offshore units.

  18. Psychosocial burden among offshore drilling platform employees.

    PubMed

    Leszczy?ska, Irena; Je?ewska, Maria

    2010-01-01

    Conditions of work on offshore drilling platforms are particularly hard due to extreme environmental situations created both by nature and technological processes. Oil drilling workers employed on the open sea are potentially exposed to permanently high stress. Apart from the obvious objective factors affecting drilling platform employees, a great role in the general work-related stress level is played by the working conditions and work-related psychosocial factors, defined according to Karask's concept as demands, control, and social support. A total of 184 drill platform workers were examined using objective and subjective research methods. The level of subjective stress among drilling platform workers is lower than the level of objective stress and the stress resulting from prognoses related with specificity of work in extremely hard conditions (audit). The examinations of drilling platform workers reveal a positive role of stress in psychological adaptation, being a special case of the "work ethos" and attachment to the firm. In such investigations of work-related stress on drilling platforms, which are very specific workplaces, a multi-aspect character, sociological and economic aspects, organizational culture conditions in the firm, and a tendency to conceal ailments and the stress experienced should be taken into account. It is important to apply measures referring to at least three different types of evidence (objective demands, subjective stress, health problems reported). Otherwise, the result reflecting work-related stress may not be objective and far from the truth. PMID:21154303

  19. Outsourcing, offshoring and the US office market

    E-print Network

    Topolewski, Tanya M., 1969-

    2004-01-01

    There is intense debate among industry analysts and scholars over potential job losses caused by offshoring. The real estate industry has been grappling to understanding the implications of these numbers, as some have ...

  20. 31 CFR 548.406 - Offshore transactions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY BELARUS SANCTIONS REGULATIONS Interpretations § 548.406 Offshore transactions. The prohibitions in § 548.201 on...

  1. 31 CFR 548.406 - Offshore transactions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY BELARUS SANCTIONS REGULATIONS Interpretations § 548.406 Offshore transactions. The prohibitions in § 548.201 on...

  2. 31 CFR 548.406 - Offshore transactions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY BELARUS SANCTIONS REGULATIONS Interpretations § 548.406 Offshore transactions. The prohibitions in § 548.201 on...

  3. 31 CFR 548.406 - Offshore transactions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY BELARUS SANCTIONS REGULATIONS Interpretations § 548.406 Offshore transactions. The prohibitions in § 548.201 on...

  4. 31 CFR 548.406 - Offshore transactions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY BELARUS SANCTIONS REGULATIONS Interpretations § 548.406 Offshore transactions. The prohibitions in § 548.201 on...

  5. 31 CFR 595.407 - Offshore transactions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... Regulations Relating to Money and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY TERRORISM SANCTIONS REGULATIONS Interpretations § 595.407 Offshore transactions. The prohibitions contained in §...

  6. Future characteristics of Offshore Support Vessels

    E-print Network

    Rose, Robin Sebastian Koske

    2011-01-01

    The objective of this thesis is to examine trends in Offshore Support Vessel (OSV) design and determine the future characteristics of OSVs based on industry insight and supply chain models. Specifically, this thesis focuses ...

  7. Offshore oil in the Alaskan Arctic

    NASA Technical Reports Server (NTRS)

    Weeks, W. F.; Weller, G.

    1984-01-01

    Oil and gas deposits in the Alaskan Arctic are estimated to contain up to 40 percent of the remaining undiscovered crude oil and oil-equivalent natural gas within U.S. jurisdiction. Most (65 to 70 percent) of these estimated reserves are believed to occuur offshore beneath the shallow, ice-covered seas of the Alaskan continental shelf. Offshore recovery operations for such areas are far from routine, with the primary problems associated with the presence of ice. Some problems that must be resolved if efficient, cost-effective, environmentally safe, year-round offshore production is to be achieved include the accurate estimation of ice forces on offshore structures, the proper placement of pipelines beneath ice-produced gouges in the sea floor, and the cleanup of oil spills in pack ice areas.

  8. Engineering Challenges for Floating Offshore Wind Turbines

    SciTech Connect

    Butterfield, S.; Musial, W.; Jonkman, J.; Sclavounos, P.

    2007-09-01

    The major objective of this paper is to survey the technical challenges that must be overcome to develop deepwater offshore wind energy technologies and to provide a framework from which the first-order economics can be assessed.

  9. A Collaborative Environment for Offshore Engineering Simulations

    E-print Network

    Barbosa, Alberto

    , gallotti, rogerps, wagnerga}@tecgraf.puc-rio.br 2 CENPES/Petrobras ismaelh@petrobras.com.br Abstract of Petrobras, a large Brazilian governmental oil & gas company. For this article we have focused on Offshore

  10. 31 CFR 593.406 - Offshore transactions.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY FORMER LIBERIAN REGIME OF CHARLES TAYLOR SANCTIONS REGULATIONS Interpretations § 593.406 Offshore transactions. The prohibitions in § 593.201 on...

  11. 31 CFR 593.406 - Offshore transactions.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...and Finance (Continued) OFFICE OF FOREIGN ASSETS CONTROL, DEPARTMENT OF THE TREASURY FORMER LIBERIAN REGIME OF CHARLES TAYLOR SANCTIONS REGULATIONS Interpretations § 593.406 Offshore transactions. The prohibitions in § 593.201 on...

  12. EMS offshore. A new horizon for paramedics.

    PubMed

    Mallard, A S

    1991-10-01

    The difficulty in getting medical aid to offshore drilling platforms can be a source of life-threatening delays. Recently, some companies have charted new waters by actually stationing EMS crews on their rigs. PMID:10116023

  13. Visualization of vibration experienced in offshore platforms

    E-print Network

    Patrikalakis, Alexander Marinos Charles

    2010-01-01

    In this thesis, I design and evaluate methods to optimize the visualization of vortex-induced vibration (VIV) in marine risers. VIV is vibration experienced by marine risers in offshore drilling platforms due to ocean ...

  14. Paraffin deposition in offshore oil production 

    E-print Network

    Elphingstone, Gerald Mason

    1995-01-01

    The extreme environmental conditions typically encountered in offshore oil operations lead to a number of problems. Cool deep sea temperatures promote particle formation and deposition of paraffinic compounds. These solids can buildup inside...

  15. New perspectives in offshore wind energy

    PubMed Central

    Failla, Giuseppe; Arena, Felice

    2015-01-01

    The design of offshore wind turbines is one of the most fascinating challenges in renewable energy. Meeting the objective of increasing power production with reduced installation and maintenance costs requires a multi-disciplinary approach, bringing together expertise in different fields of engineering. The purpose of this theme issue is to offer a broad perspective on some crucial aspects of offshore wind turbines design, discussing the state of the art and presenting recent theoretical and experimental studies. PMID:25583869

  16. Collapse of offshore pipelines: Seminar proceedings

    SciTech Connect

    Not Available

    1990-02-20

    In order to transfer the results of research on collapse of offshore pipelines sponsored by the Pipeline Research Committee, the Offshore Supervisory Committee held a one-day seminar, on February 20, 1990. Participants included experts from academia, offshore service company representatives, and natural gas and oil companies with offshore interests. Offshore pipeline construction has some significant problems not found in land pipeline construction. Among these are laying pipe over a laybarge stinger with a significant unsupported span to bottom, laying pipe from a reel barge, or pulling pipe through a J-tube to connect to an offshore platform. The latter two applications result in the pipe undergoing significant plastic deformation during the installation process, which could lead to failure of the pipe. Another unique offshore loading is from the water itself which exerts external pressure on the line during construction and operations. This external pressure may cause the pipe to collapse. There are many cases underwater where significant spans occur, such as the unsupported span from a laybarge, where the lateral loads from weight or current are carried by a combination of tension and large deflections rather than bending moments. This structural behavior is not accounted for in most piping design and analysis computer programs. The approach to address these problems has been theoretical work, small-scale testing and large-scale testing to verify the theories and small-scale tests. The seminar included the progress in understanding pipe buckling phenomena from its beginnings to the five years of PRC-sponsored work involving small-scale tests. The final and main portion of the seminar was devoted to the transfer of offshore pipeline design guidelines.

  17. New perspectives in offshore wind energy.

    PubMed

    Failla, Giuseppe; Arena, Felice

    2015-02-28

    The design of offshore wind turbines is one of the most fascinating challenges in renewable energy. Meeting the objective of increasing power production with reduced installation and maintenance costs requires a multi-disciplinary approach, bringing together expertise in different fields of engineering. The purpose of this theme issue is to offer a broad perspective on some crucial aspects of offshore wind turbines design, discussing the state of the art and presenting recent theoretical and experimental studies. PMID:25583869

  18. Reliability prediction of offshore oil and gas equipment for use in an arctic environment

    Microsoft Academic Search

    Maryam Rahimi; Marvin Rausand; Shaomin Wu

    2011-01-01

    The offshore oil and gas industry is currently moving into the arctic region. The harsh arctic environment will have an unavoidable influence on the reliability of the equipment operated in it. To understand this influence is of vital importance to ensure the reliability of the equipment and the production availability of the systems. Several types of data, such as data

  19. A Comparison of Methods for Sampling Fish Diversity in Shallow Offshore Waters of Large Rivers

    Microsoft Academic Search

    Nicolas W. R. Lapointe; Lynda D. Corkum; Nicholas E. Mandrak

    2006-01-01

    Few studies of fish assemblages have been conducted in large rivers owing to the difficulties of sampling such complex systems. We evaluated the effectiveness of six different gear types (seine nets, boat electrofishers, hoop nets, Windermere traps, trap nets, and minnow traps) in sampling the fish assemblage at 30 sites in the shallow offshore waters of the middle Detroit River

  20. Offshore structures: a book list. [80 references to offshore engineering and construction

    SciTech Connect

    Vance, M.

    1983-01-01

    The references in this bibliography are divided into the two classifications of ocean engineering and offshore structures. The first section deals with marine science and facilities in general; the latter is concerned with the construction, engineering, and maintenance of offshore structures. (DCK)

  1. Horns RevHorns Rev Offshore Wind FarmOffshore Wind Farm

    E-print Network

    Horns RevHorns Rev Offshore Wind FarmOffshore Wind Farm #12;Prepared for: ELSAM A/S, Overgade 45......................................................................................................6-1 Annex 6.1. Wind Farm Area. Spring 2001.............................................................................6-1 Annex 6.2. Wind Farm Area. Autumn 2001

  2. Deep water, dynamics and safety. [Role of dynamics in the design of offshore platforms

    SciTech Connect

    Aage, C. (Technical Univ., of Denmark, Lyngby (Denmark). Dept. of Ocean Engineering)

    1993-02-01

    As offshore drilling activities take to deeper water, the basic designs and responses of these new generation platforms become more complex. This paper discusses the increased role of understanding the dynamic behavior of the structure. As a result, the simple quasi-static wave load methods are being replaced by time simulation methods. The big problem is determining a time-series element which can accurately represent the real-world conditions. This is briefly discussed. The paper then discusses the emphasis that is placed on wave response as compared to other types of system failures (such as blow-outs, explosions, fires, human errors, etc.) which constitute the majority of offshore accidents.

  3. ? and fission-reactor radiation effects on the visible-range transparency of aluminum-jacketed, all-silica optical fibers

    Microsoft Academic Search

    David L. Griscom

    1996-01-01

    Four aluminum-jacketed, fluorine-doped silica clad optical fibers with silica core materials fabricated by differing technologies were subjected to sequential 60Co-? ray and fission-reactor irradiations (at ?20 and 40 °C, respectively), an intervening isothermal anneal (?20 °C), and a final isochronal anneal (to 600 °C) while monitoring the radiation-induced absorption spectra in the range ?400–1000 nm. The two low-OH\\/low-chloride core fibers

  4. 75 FR 17755 - Certificate of Alternative Compliance for the Offshore Supply Vessel GULF TIGER

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-07

    ...maneuver within close proximity of offshore platforms. Due to the design of the...susceptible to damage from offshore platforms. The offshore supply vessel...maneuvering within close proximity to offshore platforms. In addition, the...

  5. Trophic connections in Lake Superior Part I: the offshore fish community

    USGS Publications Warehouse

    Gamble, A.E.; Hrabik, T.R.; Stockwell, J.D.; Yule, D.L.

    2011-01-01

    Detailed diet linkages within the offshore (> 80 m bathymetric depth) food web of Lake Superior are currently not well identified. We used analyses of fish stomach contents to create an empirically based food web model of the Lake Superior offshore fish community. Stomachs were collected seasonally (spring, summer, and fall) from nine offshore locations in 2005, using bottom and midwater trawls. In total, 2643 stomachs representing 12 fish species were examined. The predominant fish species collected were deepwater sculpin (Myoxocephalus thompsonii), siscowet (Salvelinus namaycush siscowet), kiyi (Coregonus kiyi), and cisco (Coregonus artedi). Mysis diluviana was the most common prey item, indicating that changes in Mysis abundance could have a profound impact on the entire offshore food web. Mysis was the primary diet item of deepwater sculpin (? 53% by mass) and kiyi (? 96% by mass) regardless of depth or season. The invasive Bythotrephes was an important diet component of the pelagic cisco in summer and fall. Deepwater sculpin were the primary diet item of siscowet (? 52% by mass), with coregonines appearing in the diet of larger (> 400 mm) siscowet. Non-metric multidimensional scaling analysis indicated that there were no statistically significant seasonal or site-specific differences in diets of deepwater sculpin, cisco, or kiyi. Site was the primary structuring factor in siscowet diets. Generally, in Lake Superior, the diet items of the dominant offshore species did not appear to be in danger from those types of major ecological shifts occurring in the lower Laurentian Great Lakes.

  6. Experimental Investigation on Thermal Properties of a Steel-jacketed Steam Heating Pipeline with Vacuum Insulation 

    E-print Network

    Na, W.; Zou, P.

    2006-01-01

    performed to measure the combined heat transfer and equivalent thermal conductivities of the insulating material in the vacuum and rarefied air employed in the pipeline's insulation. The thermal properties of this type of insulation at vacuum pressures of 0.5...

  7. Problems unique to offshore measurement

    SciTech Connect

    Young, J.G. [ANR Pipeline Co., Lafayette, LA (United States)

    1995-12-01

    Most of us have arrived at this meeting in some kind of company provided transportation. This is supplied in order for us to do our assigned jobs. These may be trucks, or cars, or even helicopters, and maybe boats. All who are involved in the offshore industry know that transportation is the cost costly of all. The helicopter bill for our company is a bill which costs us somewhere in the 9 million dollar range. Since this costs us so much, we are constantly looking at ways to reduce this. The helicopters we use cost us $510.00 a flying hour plus $28,000.00 a month for lease. These helicopters fly in the neighborhood of 140 miles per hour. You can quickly see how fast the cost can climb. We have two technicians, along with a pilot, and approx. 400 lbs of test gear and spare parts. You have to carry all you think you will need for the day`s activities because it`s a long and costly trip to go pick up some gasket material or an orifice plate.

  8. Norwegian Offshore Stratigraphic Lexicon (NORLEX)

    NASA Astrophysics Data System (ADS)

    Gradstein, Felix M.; Hammer, Oyvind; Brunstad, Harald; Charnock, Mike; Hellem, Terje; Sigve Lervik, Kjell; Anthonissen, Erik

    2010-05-01

    The Norwegian Offshore Stratigraphic Lexicon (NORLEX) provides a relational stratigraphic database for the North Sea, Norwegian Sea, Barents Sea and Svalbard. Both regional lithostratigraphy and biostratigraphy are being substantially updated, following guidelines laid out in the International Stratigraphic Guide. The main body of information developed is available as a petroleum consortium (oracle-style) database, and the new lithostratigraphic definitions as a public domain (paper) document. NORLEX is presented as a browsing website via the internet at http://www.nhm.uio.no/norlex. Seismic cross-sections, core photographs, well logs, field outcrops, microfossil occurrences and other vital attributes are relationally cross-linked. In addition, there are menus for instantly finding updated formation and member tops or microfossil events in all wells, plus a map contouring routine for unit thicknesses and depths. Several new initiatives will expand data and user coverage: 1. Overhaul of Mesozoic stratigraphy, especially Triassic and Cretaceous, in the Barents Sea. 2. Coverage of East Greenland 3. Linkage to UK and Belgium and The Netherlands surface and subsurface stratigraphy 4. Creation of a Sequence Stratigraphic Framework for specific regions. 5. A national microfossil atlas to support zonations 6. Tight linkage to the basin datapacks in TimeScaleCreator Pro, as developed for Australia, New Zealand, Brasil, Gulf of Mexico, Canada and Russia. NORLEX may thus evolve to become STRATLEX, covering many basin regions.

  9. Federal Offshore Statistics, 1993. Leasing, exploration, production, and revenue as of December 31, 1993

    SciTech Connect

    Francois, D.K.

    1994-12-31

    This document contains statistical data on the following: federal offshore lands; offshore leasing activity and status; offshore development activity; offshore production of crude oil and natural gas; federal offshore oil and natural gas sales volume and royalties; revenue from federal offshore leases; disbursement of federal offshore revenue; reserves and resource estimates of offshore oil and natural gas; oil pollution in US and international waters; and international activities and marine minerals. A glossary is included.

  10. Spacecraft attitude impacts on COLD-SAT non-vacuum jacketed LH2 supply tank thermal performance

    NASA Technical Reports Server (NTRS)

    Arif, Hugh

    1990-01-01

    The Cryogenic On-Orbit Liquid Depot - Storage, Acquisition and Transfer (COLD-SAT) spacecraft will be launched into low earth orbit to perform fluid management experiments on the behavior of subcritical liquid hydrogen (LH2). For determining the optimum on-orbit attitude for the COLD-SAT satellite, a comparative analytical study was performed to determine the thermal impacts of spacecraft attitude on the performance of the COLD-SAT non-vacuum jacketed LH2 supply tank. Tank thermal performance was quantified by total conductive and radiative heat leakage into the pressure vessel due to the absorbed solar, earth albedo and infra-red on-orbit fluxes, and also by the uniformity of the variation of this leakage on the vessel surface area. Geometric and thermal analysis math models were developed for the spacecraft and the tank as part of this analysis, based on their individual thermal/structural designs. Two quasi-inertial spacecraft attitudes were investigated and their effects on the tank performance compared. The results are one of the criteria by which the spacecraft orientation in orbit was selected for the in-house NASA Lewis Research Center design.

  11. Spacecraft attitude impacts on COLD-SAT non-vacuum jacketed LH2 supply tank thermal performance

    NASA Technical Reports Server (NTRS)

    Arif, Hugh

    1990-01-01

    The Cryogenic On-Orbit Liquid Depot - Storage, Acquisition and Transfer (COLD-SAT) spacecraft will be launched into low earth orbit to perform fluid management experiments on the behavior of subcritical liquid hydrogen (LH2). For determining the optimum on-orbit attitude for the COLD-SAT satellite, a comparative analytical study was performed to determine the thermal impacts of spacecraft attitude on the performance of the COLD-SAT non-vacuum jacketed LH2 supply tank. Tank thermal performance was quantitied by total conductive and radiative heat leakage into the pressure vessel due to the absorbed solar, earth albedo and infra-red on-orbit fluxes, and also by the uniformity of the variation of this leakage on the vessel surface area. Geometric and thermal analysis math models were developed for the spacecraft and the tank as part of this analysis, based on their individual thermal/structural designs. Two quasi-inertial spacecraft attitudes were investigated and their effects on the tank performance compared. The results are one of the criteria by which the spacecraft orientation in orbit was selected for the in-house NASA Lewis Research Center design.

  12. Some Effects of Injection Advance Angle, Engine-Jacket Temperature, and Speed on Combustion in a Compression-Ignition Engine

    NASA Technical Reports Server (NTRS)

    Rothrock, A M; Waldron, C D

    1936-01-01

    An optical indicator and a high-speed motion-picture camera capable of operating at the rate of 2,000 frames per second were used to record simultaneously the pressure development and the flame formation in the combustion chamber of the NACA combustion apparatus. Tests were made at engine speeds of 570 and 1,500 r.p.m. The engine-jacket temperature was varied from 100 degrees to 300 degrees F. And the injection advance angle from 13 degrees after top center to 120 degrees before top center. The results show that the course of the combustion is largely controlled by the temperature and pressure of the air in the chamber from the time the fuel is injected until the time at which combustion starts and by the ignition lag. The conclusion is presented that in a compression-ignition engine with a quiescent combustion chamber the ignition lag should be the longest that can be used without excessive rates of pressure rise; any further shortening of the ignition lag decreased the effective combustion of the engine.

  13. Lake Michigan Offshore Wind Feasibility Assessment

    SciTech Connect

    Boezaart, Arnold [GVSU; Edmonson, James [GVSU; Standridge, Charles [GVSU; Pervez, Nahid [GVSU; Desai, Neel [University of Michigan; Williams, Bruce [University of Delaware; Clark, Aaron [GVSU; Zeitler, David [GVSU; Kendall, Scott [GVSU; Biddanda, Bopi [GVSU; Steinman, Alan [GVSU; Klatt, Brian [Michigan State University; Gehring, J. L. [Michigan State University; Walter, K. [Michigan State University; Nordman, Erik E. [GVSU

    2014-06-30

    The purpose of this project was to conduct the first comprehensive offshore wind assessment over Lake Michigan and to advance the body of knowledge needed to support future commercial wind energy development on the Great Lakes. The project involved evaluation and selection of emerging wind measurement technology and the permitting, installation and operation of the first mid-lake wind assessment meteorological (MET) facilities in Michigan’s Great Lakes. In addition, the project provided the first opportunity to deploy and field test floating LIDAR and Laser Wind Sensor (LWS) technology, and important research related equipment key to the sitting and permitting of future offshore wind energy development in accordance with public participation guidelines established by the Michigan Great Lakes Wind Council (GLOW). The project created opportunities for public dialogue and community education about offshore wind resource management and continued the dialogue to foster Great Lake wind resource utilization consistent with the focus of the GLOW Council. The technology proved to be effective, affordable, mobile, and the methods of data measurement accurate. The public benefited from a substantial increase in knowledge of the wind resources over Lake Michigan and gained insights about the potential environmental impacts of offshore wind turbine placements in the future. The unique first ever hub height wind resource assessment using LWS technology over water and development of related research data along with the permitting, sitting, and deployment of the WindSentinel MET buoy has captured public attention and has helped to increase awareness of the potential of future offshore wind energy development on the Great Lakes. Specifically, this project supported the acquisition and operation of a WindSentinel (WS) MET wind assessment buoy, and associated research for 549 days over multiple years at three locations on Lake Michigan. Four research objectives were defined for the project including to: 1) test and validate floating LIDAR technology; 2) collect and access offshore wind data; 3) detect and measure bird and bat activity over Lake Michigan; 4) conduct an over water sound propagation study; 5) prepare and offer a college course on offshore energy, and; 6) collect other environmental, bathometric, and atmospheric data. Desk-top research was performed to select anchorage sites and to secure permits to deploy the buoy. The project also collected and analyzed data essential to wind industry investment decision-making including: deploying highly mobile floating equipment to gather offshore wind data; correlating offshore wind data with conventional on-shore MET tower data; and performing studies that can contribute to the advancement and deployment of offshore wind technologies. Related activities included: • Siting, permitting, and deploying an offshore floating MET facility; • Validating the accuracy of floating LWS using near shoreline cup anemometer MET instruments; • Assessment of laser pulse technology (LIDAR) capability to establish hub height measurement of wind conditions at multiple locations on Lake Michigan; • Utilizing an extended-season (9-10 month) strategy to collect hub height wind data and weather conditions on Lake Michigan; • Investigation of technology best suited for wireless data transmission from distant offshore structures; • Conducting field-validated sound propagation study for a hypothetical offshore wind farm from shoreline locations; • Identifying the presence or absence of bird and bat species near wind assessment facilities; • Identifying the presence or absence of benthic and pelagic species near wind assessment facilities; All proposed project activities were completed with the following major findings: • Floating Laser Wind Sensors are capable of high quality measurement and recordings of wind resources. The WindSentinel presented no significant operational or statistical limitations in recording wind data technology at a at a high confidence level as compared to traditional an

  14. The Seabed Stability Zonation in Chinese Offshore

    NASA Astrophysics Data System (ADS)

    Du, J.

    2013-12-01

    There are abundant natural resources and energy in Chinese offshore continental shelf, and which should be the most development potential region now and in the future. But the seabed of Chinese offshore is often under the instable status caused by many factors which deeply affects the safety of marine development. Marine geohazards is an active one among the influence factors. The marine geohazards means the geological factors developed in the seabed surface and the strata below the seabed, such as fault, shallow gas, landslide, coastal erosion, buried river channel, sand wave and sand ridge, easily liquefied sand layer etc., which will cause damage to the human life and property. In this paper, the seabed stability were analyzed and divided it into five grades based on the marine geohazards evaluation result which made by fuzzy mathematic model. Firstly, by collecting the analyzing the marine geohazards which distributed on the seabed or under the seabed, the marine geohazards maps in Chinese offshore were made and the classification system of marine geohazards was established. Then, the evaluation index system of seabed stability was set which included the seismic peak acceleration, geomorphology, direct geohazards and restricted geohazards. And the weighted value of each indicator was calculated by using analytic hierarchy process. And, a group of appropriate number with normal distribution was selected to replace the membership grade function. Based on above, a fuzzy evaluation model for seabed stability is established. Using the maps of marine geohazards, geomorphology maps and seismic peak acceleration maps as data source, using the fuzzy matrix as calculated method, based on the principles of maximum membership grade of fuzzy mathematics, we get the evaluation result of Chinese offshore with 6' by 6' grid unit. The maximum membership grade should be taken as the stability level in each unit. Above all, the seabed stability of Chinese offshore is divided into five grades according to the maximum membership grade. In this paper, we defined 5 classes which respectively were basically stable, relatively stable, medium, relatively unstable and unstable. By using statistical analysis method, a stability zonation map of the Chinese offshore has been drawn based on the evaluation result of each unit. From the stability map, Chinese offshore seabed stability was divided into sixty sub-regions with 5 classes. And the unstable sub-regions were mainly located in the North-East of Liaodong Bay, north of Laizhou Bay, the shoal in north Jiangsu, north Taiwan offshore and around Nan'ao Islands of Guangdong. Most Chinese offshore seabed stability has been in the relatively stable status.

  15. Offshore windmills and the effects of electromagnetic fields on fish.

    PubMed

    Ohman, Marcus C; Sigray, Peter; Westerberg, Håkan

    2007-12-01

    With the large scale developments of offshore windpower the number of underwater electric cables is increasing with various technologies applied. A wind farm is associated with different types of cables used for intraturbine, array-to-transformer, and transformer-to-shore transmissions. As the electric currents in submarine cables induce electromagnetic fields there is a concern of how they may influence fishes. Studies have shown that there are fish species that are magneto-sensitive using geomagnetic field information for the purpose of orientation. This implies that if the geomagnetic field is locally altered it could influence spatial patterns in fish. There are also physiological aspects to consider, especially for species that are less inclined to move as the exposure could be persistent in a particular area. Even though studies have shown that magnetic fields could affect fish, there is at present limited evidence that fish are influenced by the electromagnetic fields that underwater cables from windmills generate. Studies on European eel in the Baltic Sea have indicated some minor effects. In this article we give an overview on the type of submarine cables that are used for electric transmissions in the sea. We also describe the character of the magnetic fields they induce. The effects of magnetic fields on fish are reviewed and how this may relate to the cables used for offshore wind power is discussed. PMID:18240676

  16. Genetic differentiation between inshore and offshore Atlantic cod (Gadus morhua)

    E-print Network

    Ruzzante, Daniel E.

    Genetic differentiation between inshore and offshore Atlantic cod (Gadus morhua) off Newfoundland, and Sally V. Goddard Abstract: The genetic difference between inshore overwintering Atlantic cod (Gadus morhua) from Trinity Bay, Newfoundland, and offshore overwintering cod from the Grand Bank region

  17. Hard Bottom Substrate Monitoring Horns Rev Offshore Wind Farm

    E-print Network

    Hard Bottom Substrate Monitoring Horns Rev Offshore Wind Farm Annual Status Report 2003 #12;Hard Bottom Substrate Monitoring Horns Rev Offshore Wind Farm Annual Status Report 2003 Published: 14 May 2004

  18. FEED-IN TARIFFS AND OFFSHORE WIND POWER DEVELOPMENT

    E-print Network

    Firestone, Jeremy

    FEED-IN TARIFFS AND OFFSHORE WIND POWER DEVELOPMENT Prepared by Jon Lilley, Blaise Sheridan, Dawn........................................................................................................................ 28 #12; 3 Feed-in Tariffs and Offshore Wind Power Development Prepared Pursuant to DOE Grant Em

  19. E2I EPRI Assessment Offshore Wave Energy Conversion Devices

    E-print Network

    E2I EPRI Assessment Offshore Wave Energy Conversion Devices Report: E2I EPRI WP ­ 004 ­ US ­ Rev 1 #12;E2I EPRI Assessment - Offshore Wave Energy Conversion Devices Table of Contents Introduction ............................................................................... 26 Appendix E - Orecon

  20. 46 CFR 15.520 - Mobile offshore drilling units (MODUs).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... 2014-10-01 2014-10-01 false Mobile offshore drilling units (MODUs). 15.520 Section 15.520 Shipping...Requirements; Inspected Vessels § 15.520 Mobile offshore drilling units (MODUs). (a) The requirements in this...

  1. Plastic Limit Analysis of Offshore Foundation and Anchor 

    E-print Network

    Chi, Chao-Ming

    2010-10-12

    This study presents the applications of plastic limit analysis to offshore foundations and anchors, including the drag embedment anchors (DEAs) for mobile offshore drilling units (MODU’s) and spudcan foundations for jack-up ...

  2. Strengthening America's Energy Security with Offshore Wind (Fact Sheet)

    SciTech Connect

    Not Available

    2012-02-01

    This fact sheet describes the current state of the offshore wind industry in the United States and the offshore wind research and development activities conducted the U.S. Department of Energy Wind and Water Power Program.

  3. Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine

    E-print Network

    Bae, Yoon Hyeok

    2013-04-23

    floating wind turbines, so the effects of such high-frequency excitations from the tower and blades need to be checked. 5 Another concept for floating offshore wind farms is the Multiple Unit Floating Offshore Wind Turbine (MUFOWT). This model...

  4. Ecological Issues Related to Decommissioning of California's Offshore Production Platforms

    E-print Network

    Carr, Mark H.

    Ecological Issues Related to Decommissioning of California's Offshore Production Platforms Report offshore oil production platforms to assess the current state of knowledge and identify a research agenda................................................................................................................ 8 II.A. Review of California platforms

  5. Assessment of Ports for Offshore Wind Development in the United States

    SciTech Connect

    Elkinton, Chris [DNV GL] [DNV GL; Blatiak, Alicia; Ameen, Hafsa

    2014-03-21

    As offshore wind energy develops in the United States, port facilities will become strategic hubs in the offshore wind farm supply chain because all plant and transport logistics must transit through these facilities. Therefore, these facilities must provide suitable infrastructure to meet the specific requirements of the offshore wind industry. As a result, it is crucial that federal and state policy-makers and port authorities take effective action to position ports in the offshore wind value chain to take best advantage of their economic potential. The U.S. Department of Energy tasked the independent consultancy GL Garrad Hassan (GL GH) with carrying out a review of the current capability of U.S. ports to support offshore wind project development and an assessment of the challenges and opportunities related to upgrading this capability to support the growth of as many as 54 gigawatts of offshore wind installed in U.S. waters by 2030. The GL GH report and the open-access web-based Ports Assessment Tool resulting from this study will aid decision-makers in making informed decisions regarding the choice of ports for specific offshore projects, and the types of investments that would be required to make individual port facilities suitable to serve offshore wind manufacturing, installation and/or operations. The offshore wind industry in the United States is still in its infancy and this study finds that additional port facilities capable of supporting offshore wind projects are needed to meet the anticipated project build-out by 2030; however, no significant barriers exist to prevent the development of such facilities. Furthermore, significant port capabilities are in place today with purpose-build port infrastructure currently being built. While there are currently no offshore wind farms operating in the United States, much of the infrastructure critical to the success of such projects does exist, albeit in the service of other industries. This conclusion is based on GL GH’s review of U.S. ports infrastructure and its readiness to support the development of proposed offshore wind projects in U.S. waters. Specific examples of facility costs and benefits are provided for five coastal regions (North Atlantic, South Atlantic, Gulf of Mexico, Great Lakes, and Pacific) around the country. GL GH began this study by identifying the logistical requirements of offshore wind ports to service offshore wind. This review was based on lessons learned through industry practice in Northern Europe. A web-based port readiness assessment tool was developed to allow a capability gap analysis to be conducted on existing port facilities based on the identified requirements. Cost models were added to the assessment tool, which allowed GL GH to estimate the total upgrade cost to a port over the period 2014-2030 based on a set of regional project build-out scenarios. Port fee information was gathered from each port allowing an estimate of the potential revenue to the port under this same set of scenarios. The comparison of these revenue and improvement cost figures provides an initial indication of the level of offshore wind port readiness. To facilitate a more in-depth infrastructure analysis, six ports from different geographic regions, with varied levels of interest and preparedness towards offshore wind, were evaluated by modeling a range of installation strategies and port use types to identify gaps in capability and potential opportunities for economic development. Commonalities, trends, and specific examples from these case studies are presented and provide a summary of the current state of offshore wind port readiness in the U.S. and also illustrate the direction some ports have chosen to take to prepare for offshore wind projects. For example, the land area required for wind turbine and foundation manufacturing is substantial, particularly due to the large size of offshore wind components. Also, the necessary bearing capacities of the quayside and storage area are typically greater for offshore wind components than for more conventiona

  6. Exploration potential of offshore northern California basins

    SciTech Connect

    Bachman, S.B.; Crouch, J.K.

    1988-01-01

    A series of exploratory wells was drilled in the northern California offshore basins in the 1960s following leasing of federal tracts off northern California, Oregon, and Washington. The drilling, although encountering numerous oil shows, was considered at the time to indicate low prospectivity in an area that extended as far south as the offshore Santa Maria basin. However, subsequent major discoveries in this decade in the offshore Santa Maria basin, such as the Point Arguello field, indicate that these offshore basins may be highly prospective exploration targets. Many of the key features of Monterey production in central and southern California are also present in the offshore basins of northern California. A new 5-year leasing plan has scheduled leasing in the northern California OCS starting in early 1989. The first basins on the schedule, the Point Arena and Eel River basins, differ in some respects. The Point Arena basin is more typical of a Monterey basin, with the potential for fractured chert reservoirs and organic-rich sections, deep burial of basinal sections to enhance the generation of higher gravity oils, and complex folding and faulting. The Eel River basin is more clastic-rich in its gas-producing, onshore extension. Key questions in the Eel River basin include whether the offshore, more distal stratigraphy will include Monterey-like biogenic sediments, and whether the basin has oil potential in addition to its proven gas potential. The Outer Santa Cruz basin shares a similar stratigraphy, structure, and hydrocarbon potential with the Point Arena basin. The Santa Cruz-Bodega basin, also with a similar stratigraphy, may have less exploration potential because erosion has thinned the Monterey section in parts of the basin.

  7. Offshore Series Wind Turbine Variable Hub heights & rotor diameters

    E-print Network

    Firestone, Jeremy

    3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters harmonious function within the local grid Allows wind turbines to stay on line generating power, even during-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also

  8. 47 CFR 22.1037 - Application requirements for offshore stations.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Application requirements for offshore...CARRIER SERVICES PUBLIC MOBILE SERVICES Offshore...Service § 22.1037 Application requirements for offshore...days before filing the application: (1) The name...caused to any base or mobile station using the...

  9. A Brief History of the New England Offshore Fisheries

    E-print Network

    A Brief History of the New England Offshore Fisheries By Albert C. Jensen UNITED STATES DEPARTMENT BERIE. onald L. :'.lcK rnan, Dir dor A Brief History of the New England Offshore Fisheries By ALBER T C · · · · · · · · · · 0 · 0 · · · · · · · · · · 111 12 14 #12;A Brief History of the New England Offshore Fisheries

  10. R & D on Offshore Wind Power Generation System in Japan

    Microsoft Academic Search

    Kazuhito Oishi; Yukinari Fukumoto

    2009-01-01

    Offshore wind energy has been widely exploited in Europe. Having a long coastline, the offshore wind energy will be the one of the important solutions for the increase of renewable energy in Japan. However, due to the difference in wind and marine condition between Japan and Europe, the safety, the environmental impact and the economical feasibility of the offshore wind

  11. ForPeerReview PUBLIC ACCEPTANCE OF OFFSHORE WIND POWER

    E-print Network

    Firestone, Jeremy

    ForPeerReview PUBLIC ACCEPTANCE OF OFFSHORE WIND POWER PROJECTS IN THE UNITED STATES Journal: Wind, Andrew; Minerals Management Service Keywords: offshore wind power, public opinion, social acceptancePeerReview 1 PUBLIC ACCEPTANCE OF OFFSHORE WIND POWER PROJECTS IN THE UNITED STATES Jeremy Firestone*, Willett

  12. Risk-based inspection planning optimisation of offshore wind turbines

    Microsoft Academic Search

    José G. Rangel-Ramírez; John D. Sørensen

    2010-01-01

    Wind industry is substantially propelled and the future scenarios designate offshore locations as important sites for energy production. With this development, offshore wind farms represent a feasible option to accomplish the needed energy, bringing with it technical and economical challenges. Inspection and maintenance (I&M) costs for offshore sites are much larger than for onshore ones, making the choice of suitable

  13. Ris-R-1407(EN) Efficient Development of Offshore

    E-print Network

    the at- mosphere and wind turbines in offshore regimes. The objective of the ENDOW project the impact of thermal flows, roughness and orography on offshore wind speeds. The model hierarchy developed, Roskilde April 2003 #12;Abstract Europe has large offshore wind energy potential that is poised

  14. Risk-based inspection planning optimisation of offshore wind turbines

    Microsoft Academic Search

    José G. Rangel-Ramírez; John D. Sørensen

    2012-01-01

    Wind industry is substantially propelled and the future scenarios designate offshore locations as important sites for energy production. With this development, offshore wind farms represent a feasible option to accomplish the needed energy, bringing with it technical and economical challenges. Inspection and maintenance (I&M) costs for offshore sites are much larger than for onshore ones, making the choice of suitable

  15. Seabed instability simplified model and application in offshore wind turbine

    Microsoft Academic Search

    Zhang Yong-li; Li Jie

    2009-01-01

    The offshore wind power is increasingly developed, it is essential to study the design technology of the offshore wind turbine foundation, which is crucial to reduce the construction cost of the offshore wind farm. In the design of marine pile foundations, the evaluation of wave-induced seabed stability is quite significant. Based on the mechanical properties of seabed, this article firstly

  16. Evolution and Reduction of Scour around Offshore Wind Turbines

    Microsoft Academic Search

    David McGovern; Suzana Ilic

    2010-01-01

    Evolution and Reduction of Scour around Offshore Wind Turbines In response to growing socio-economic and environmental demands, electricity generation through offshore wind turbine farms is a fast growing sector of the renewable energy market. Considerable numbers of offshore wind farms exist in the shallow continental shelf seas of the North-West Europe, with many more in the planning stages. Wind energy

  17. Building the business case for diversity in offshoring

    Microsoft Academic Search

    Carine Peeters; Patricia Garcia-Prieto Sol

    2009-01-01

    Offshoring inevitably leads to increased cultural diversity in work relations. Most companies perceive this increased diversity as a risk, a problem that needs to be minimized or remedied for offshoring to succeed. Building on the business case for diversity management literature we propose an alternative positive view of cultural diversity in the context of offshore relationships. We suggest that the

  18. Energy Efficient Pump Control for an Offshore Oil Processing System

    E-print Network

    Yang, Zhenyu

    /gas to the onshore or nearby offshore processing platforms, and move the products from one processing facilityEnergy Efficient Pump Control for an Offshore Oil Processing System Zhenyu Yang Kian Soleiman Bo, Denmark. Abstract: The energy efficient control of a pump system for an offshore oil processing system

  19. A fuzzy approach to the lectotype optimization of offshore platforms

    Microsoft Academic Search

    S. Chen; G. Fu

    2003-01-01

    Lectotype optimization of offshore platforms is of particular importance in the concept design process. Lectotype optimization involves multiple objectives with uncertainty and so is a problem of multiple attribute decision making. To date, there have been few published works on this topic in the context of offshore engineering. This paper develops a framework and methodology for evaluation of offshore platform

  20. International Offshore Students' Perceptions of Virtual Office Hours

    ERIC Educational Resources Information Center

    Wdowik, Steven; Michael, Kathy

    2013-01-01

    Purpose: The main aim of this study is to gauge international offshore students' perceptions of virtual office hours (VOH) to consult with their offshore unit coordinators in Australia. Design/methodology/approach: This paper employs a quantitative and qualitative approach where data was sourced from three offshore campuses over a 12-month period…

  1. Regional method to assess offshore slope stability.

    USGS Publications Warehouse

    Lee, H.J.; Edwards, B.D.

    1986-01-01

    The slope stability of some offshore environments can be evaluated by using only conventional acoustic profiling and short-core sampling, followed by laboratory consolidation and strength testing. The test results are synthesized by using normalized-parameter techniques. The normalized data are then used to calculate the critical earthquake acceleration factors or the wave heights needed to initiate failure. These process-related parameters provide a quantitative measure of the relative stability for locations from which short cores were obtained. The method is most applicable to offshore environments of gentle relief and simple subsurface structure and is not considered a substitute for subsequent site-specific analysis. -from ASCE Publications Information

  2. Exotic invertebrate species on offshore oil platforms

    Microsoft Academic Search

    Henry M. Page; J Enifer E. Dugan; Carolynn S. Culver; JC Hoesterey

    2006-01-01

    ABSTRACT: We report the presence,of 3 exotic invertebrate,species,inhabiting,offshore,oil and gas platforms on the Pacific offshore continental shelf (POeS) of central and southern California, USA. These exotic species,occur in high cover or density and may,negatively,affect populations,of native species on the platforms. Conspicuous,exotic species,(the bryozoan,Watersipora ?subtorquata and the anemone,Diadumene,sp.) were detected on 2 of 7 platforms,surveyed. An inconspicuous,exotic spe­ cies (the amphipod,Caprella

  3. Final Report DE-EE0005380: Assessment of Offshore Wind Farm Effects on Sea Surface, Subsurface and Airborne Electronic Systems

    SciTech Connect

    Ling, Hao [The University of Texas at Austin] [The University of Texas at Austin; Hamilton, Mark F. [The University of Texas at Austin Applied Research Laboratories] [The University of Texas at Austin Applied Research Laboratories; Bhalla, Rajan [Science Applications International Corporation] [Science Applications International Corporation; Brown, Walter E. [The University of Texas at Austin Applied Research Laboratories] [The University of Texas at Austin Applied Research Laboratories; Hay, Todd A. [The University of Texas at Austin Applied Research Laboratories] [The University of Texas at Austin Applied Research Laboratories; Whitelonis, Nicholas J. [The University of Texas at Austin] [The University of Texas at Austin; Yang, Shang-Te [The University of Texas at Austin] [The University of Texas at Austin; Naqvi, Aale R. [The University of Texas at Austin] [The University of Texas at Austin

    2013-09-30

    Offshore wind energy is a valuable resource that can provide a significant boost to the US renewable energy portfolio. A current constraint to the development of offshore wind farms is the potential for interference to be caused by large wind farms on existing electronic and acoustical equipment such as radar and sonar systems for surveillance, navigation and communications. The US Department of Energy funded this study as an objective assessment of possible interference to various types of equipment operating in the marine environment where offshore wind farms could be installed. The objective of this project was to conduct a baseline evaluation of electromagnetic and acoustical challenges to sea surface, subsurface and airborne electronic systems presented by offshore wind farms. To accomplish this goal, the following tasks were carried out: (1) survey electronic systems that can potentially be impacted by large offshore wind farms, and identify impact assessment studies and research and development activities both within and outside the US, (2) engage key stakeholders to identify their possible concerns and operating requirements, (3) conduct first-principle modeling on the interactions of electromagnetic signals with, and the radiation of underwater acoustic signals from, offshore wind farms to evaluate the effect of such interactions on electronic systems, and (4) provide impact assessments, recommend mitigation methods, prioritize future research directions, and disseminate project findings. This report provides a detailed description of the methodologies used to carry out the study, key findings of the study, and a list of recommendations derived based the findings.

  4. Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development

    Microsoft Academic Search

    Pamela M. Aker; Anthony M. Jones; Andrea E. Copping

    2010-01-01

    Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at

  5. United States Offshore Wind Resource Assessment

    NASA Astrophysics Data System (ADS)

    Schwartz, M.; Haymes, S.; Heimiller, D.

    2008-12-01

    The utilization of the offshore wind resource will be necessary if the United States is to meet the goal of having 20% of its electricity generated by wind power because many of the electrical load centers in the country are located along the coastlines. The United States Department of Energy, through its National Renewable Energy Laboratory (NREL), has supported an ongoing project to assess the wind resource for the offshore regions of the contiguous United States including the Great Lakes. Final offshore maps with a horizontal resolution of 200 meters (m) have been completed for Texas, Louisiana, Georgia, northern New England, and the Great Lakes. The ocean wind resource maps extend from the coastline to 50 nautical miles (nm) offshore. The Great Lake maps show the resource for all of the individual lakes. These maps depict the wind resource at 50 m above the water as classes of wind power density. Class 1 represents the lowest available wind resource, while Class 7 is the highest resource. Areas with Class 5 and higher wind resource can be economical for offshore project development. As offshore wind turbine technology improves, areas with Class 4 and higher resource should become economically viable. The wind resource maps are generated using output from a modified numerical weather prediction model combined with a wind flow model. The preliminary modeling is performed by AWS Truewind under subcontract to NREL. The preliminary model estimates are sent to NREL to be validated. NREL validates the preliminary estimates by comparing 50 m model data to available measurements that are extrapolated to 50 m. The validation results are used to modify the preliminary map and produce the final resource map. The sources of offshore wind measurement data include buoys, automated stations, lighthouses, and satellite- derived ocean wind speed data. The wind electric potential is represented as Megawatts (MW) of potential installed capacity and is based on the square kilometers (sq. km) of Class 5 and higher wind resource found in a specific region. NREL uses a factor of 5 MW of installed capacity per sq. km of "windy water" for its raw electric potential calculations. NREL uses Geographic Information System data to break down the offshore wind potential by state, water depth, and distance from shore. The wind potential estimates are based on the updated maps, and on previous offshore resource information for regions where new maps are not available. The estimates are updated as new maps are completed. For example, the updated Texas offshore map shows almost 3000 sq. km of Class 5 resource within 10 nm of shore and nearly 2000 sq. km of Class 5 resource or 10,000 MW of potential installed capacity in water depths of less than 30 m. NREL plans to develop exclusion criteria to further refine the offshore wind potential

  6. A New Architecture for Offshore Wind Farms

    Microsoft Academic Search

    Anish Prasai; Jung-Sik Yim; Deepak Divan; Ashish Bendre; Seung-Ki Sul

    2008-01-01

    Offshore wind farms using HVDC links can be positioned a large distance from shore, opening up new opportunities for wind generation. Conventional approaches using 60 Hz generators and transformers are not appropriate in such applications, as they are heavy and result in expensive and complex installation and maintenance issues. This paper proposes an alternative architecture for such wind farms, using

  7. A new architecture for offshore wind farms

    Microsoft Academic Search

    Anish Prasai; A. Bendre; Jung-Sik Yim; Seung-Ki Sul; D. Divan; Frank Kreikebaum

    2007-01-01

    Offshore wind farms using HVDC links can be positioned a large distance from shore, opening up new opportunities for wind generation. Conventional approaches using 60 hertz generators and transformers are not appropriate in such applications, as they are heavy and result in expensive and complex installation and maintenance issues. This paper proposes an alternative architecture for such wind farms, using

  8. Oceanic engineering and offshore energy production

    Microsoft Academic Search

    William M. Carey; Claude P Brancart

    2008-01-01

    The Annual Energy Outlook 2008 [1] prepared by Energy Information Administration of the United States Department of Energy projects the continued use of fossil fuels (liquids, coal and natural gas) with little emphasis on “Oceanic Energy Conversion” and marginal importance to “Offshore Wind Energy conversion.” However the potential energy available for conversion to electrical energy along the coastal United States

  9. Offshore maintenance reduces cost and downtime

    Microsoft Academic Search

    Danahy

    1983-01-01

    Maintenance is the single activity offshore that can have the most impact on productivity, safety, and downtime. Unfortunately, unless it is well organized, maintenance may be carried out according to unchanging and often unnecessary routines. Overly rigid maintenance procedures, that are viewed by crews as ''makework'' assignments, are not conducive to quality or to failure-proof operation of key rig systems.

  10. Rocky and Sandy Seafloor Offshore California

    USGS Multimedia Gallery

    Image of ripples in sand, next to a rocky surface on the seafloor 2.5 km (1.5 miles) offshore San Mateo County, California at a depth of 24.6 meters (81 feet). The two red dots in the image (from lasers mounted on the camera and used as reference points) are 15 cm (6 inches) apa...

  11. Nantucket Sound Offshore Wind Stakeholder Process

    Microsoft Academic Search

    Greg Watson; Fara Courtney

    2004-01-01

    In response to government efforts to promote renewable energy development, Cape Wind Associates proposed the first offshore wind farm in the United States. The plan has been met with both vehement opposition and ardent support. In response to an increasingly unproductive debate over the project, the Massachusetts Technology Collaborative (MTC), a quasi-state agency, held a series of stakeholder meetings to

  12. A heave compensation approach for offshore cranes

    Microsoft Academic Search

    Jörg Neupert; Tobias Mahl; Bertrand Haessig; Oliver Sawodny; Klaus Schneider

    2008-01-01

    Offshore installations during harsh sea conditions results in rigorous requirements in terms of safety and efficiency for the involved crane system. Hence a heave compensation system based on heave motion prediction and an inversion based control strategy is proposed. The control objective is to let the rope suspended payload track a desired reference trajectory in an earth fixed frame without

  13. Accord near for offshore California oil shipments

    SciTech Connect

    Not Available

    1993-02-15

    There are faint glimmers of hope again for offshore California operators. After more than a decade of often bitter strife over offshore oil and gas development and transportation issues, state officials and oil producers may be moving toward compromise solutions. One such solution may be forthcoming on offshore development. But the real change came with the turnabout of the California Coastal Commission (CCC), which last month approved a permit for interim tankering of crude from Point Arguello oil field in the Santa Barbara Channel to Los Angeles. The dispute over how to ship offshore California crude to market has dragged on since before Point Arguelo development plans were unveiled. The project's status has become a flashpoint in the U.S. debate over resource use and environmental concerns. The controversy flared anew in the wake of the 1989 Exxon Valdez tanker spill off Alaska, when CCC voided a Santa Barbara County permit for interim tankering, a move project operator Chevron Corp. linked to the Exxon Valdez accident. Faced with litigation, the state's economic devastation, and acrimonious debate over transporting California crude, Gov. Pete Wilson and other agencies approved the CCC permit. But there's a catch: A permanent pipeline must be built to handle full production within 3 years. The paper discusses permit concerns, the turnaround decision, the anger of environmental groups, and pipeline proposals.

  14. CHOOSING OFFSHORE PIPELINE ROUTES: PROBLEMS AND SOLUTIONS

    EPA Science Inventory

    The report discusses the environmental and fisheries problems associated with offshore pipelines. The report focuses on how these problems can be addressed during the pipeline planning and route selection process. Geologic hazards are highlighted as the major factors related to p...

  15. High-Alloy Materials for Offshore Applications

    Microsoft Academic Search

    T. F. Lemke; J. A. Harris

    1983-01-01

    High-alloy materials possessing good corrosion resistance in hot, sour brines are being seriously considered for offshore applications. These alloys are available in a wide range of strength levels which can be attained by the methods of cold working or precipitation hardening. Results of testing INCONEL alloys 625 and 718 and INCOLOY alloys 825 and 925 for resistance to general corrosion,

  16. Planning and evaluation parameters for offshore complexes

    NASA Technical Reports Server (NTRS)

    Sincoff, M. Z. (editor); Dajani, J. S. (editor)

    1976-01-01

    Issues are presented for consideration in the planning and design of offshore artificial complexes. The construction of such complexes, their social, economic, and ecological impacts, and the legal-political-institutional environments within which their development could occur, are discussed. Planning, design, and construction of near-shore complexes located off the Mid-Atlantic coast of the United States is emphasized.

  17. Environmental effects of offshore oil production

    Microsoft Academic Search

    Middleditch

    1981-01-01

    The Buccaneer Gas and Oil Field Study is the most comprehensive interdisciplinary ecological study to date of an offshore oil field operating under normal conditions. Involving nearly 30 individual research groups, the study focused on the effects of the oil field structures and on low-level chronic exposure of organisms to various discharges from the production platforms. Chapters cover a wide

  18. HYDRODYNAMIC LOADING ON SLENDER OFFSHORE WIND TURBINES

    Microsoft Academic Search

    A. R. Henderson; Garrad Hassan

    In the shallow seas that are the favoured locations for offshore wind farms, the limited water depths can result in highly non-linear waves. The determination of the design wave loads will involve selection of appropriate models of wave kinematics as well as force and structural dynamics models. Each selection will involve a compromise between accuracy and usability (speed, ease of

  19. Sea loads on ships and offshore structures

    Microsoft Academic Search

    O. M. Faltinsen

    1990-01-01

    The book introduces the theory of the structural loading on ships and offshore structures caused by wind, waves and currents, and goes on to describe the applications of this theory in terms of real structures. The main topics described are linear-wave induced motions, loads on floating structures, numerical methods for ascertaining wave induced motions and loads, viscous wave loads and

  20. Practical stochastic fatigue analysis of offshore platforms

    Microsoft Academic Search

    R. Skjong; H. O. Madsen

    1987-01-01

    A method for stochastic fatigue analysis of offshore platforms is presented. The method accounts for the nonlinearity in the drag loading term, and for the systematic deviation from a Gaussian process for a platform response. The method is based on an assumed form of the stress response process at a hot spot. A number of full scale measurements for elements

  1. Fatigue failure paths for offshore platform inspection

    Microsoft Academic Search

    Demir I. Karsan; Ashok Kumar

    1990-01-01

    A closed- form, reliability-based procedure is developed to identify fatigue failure paths of offshore structures and assess the notional probability of system failure through these paths. The procedure utilizes the Miners rule node fatigue failure reliability model developed by Wirsching. Effects of load redistribution following the fatigue failure of a node on the time to failure of remaining unfailed nodes

  2. Effect of confining pressure due to external jacket of steel plate or shape memory alloy wire on bond behavior between concrete and steel reinforcing bars.

    PubMed

    Choi, Eunsoo; Kim, Dongkyun; Park, Kyoungsoo

    2014-12-01

    For external jackets of reinforced concrete columns, shape memory alloy (SMA) wires are easy to install, and they provide active and passive confining pressure; steel plates, on the other hand, only provide passive confining pressure, and their installation on concrete is not convenient because of the requirement of a special device. To investigate how SMA wires distinctly impact bond behavior compared with steel plates, this study conducted push-out bond tests of steel reinforcing bars embedded in concrete confined by SMA wires or steel plates. For this purpose, concrete cylinders were prepared with dimensions of 100 mm x 200 mm, and D-22 reinforcing bars were embedded at the center of the concrete cylinders. External jackets of 1.0 mm and 1.5 mm thickness steel plates were used to wrap the concrete cylinders. Additionally, NiTiNb SMA wire with a diameter of 1.0 mm was wound around the concrete cylinders. Slip of the reinforcing bars due to pushing force was measured by using a displacement transducer, while the circumferential deformation of specimens was obtained by using an extensometer. The circumferential deformation was used to calculate the circumferential strains of the specimens. This study assessed the radial confining pressure due to the external jackets on the reinforcing bars at bond strength from bond stress-slip curves and bond stress-circumferential strain curves. Then, the effects of the radial confining pressure on the bond behavior of concrete are investigated, and an equation is suggested to estimate bond strength using the radial confining pressure. Finally, this study focused on how active confining pressure due to recovery stress of the SMA wires influences bond behavior. PMID:25971115

  3. Mapping seabird sensitivity to offshore wind farms.

    PubMed

    Bradbury, Gareth; Trinder, Mark; Furness, Bob; Banks, Alex N; Caldow, Richard W G; Hume, Duncan

    2014-01-01

    We present a Geographic Information System (GIS) tool, SeaMaST (Seabird Mapping and Sensitivity Tool), to provide evidence on the use of sea areas by seabirds and inshore waterbirds in English territorial waters, mapping their relative sensitivity to offshore wind farms. SeaMaST is a freely available evidence source for use by all connected to the offshore wind industry and will assist statutory agencies in assessing potential risks to seabird populations from planned developments. Data were compiled from offshore boat and aerial observer surveys spanning the period 1979-2012. The data were analysed using distance analysis and Density Surface Modelling to produce predicted bird densities across a grid covering English territorial waters at a resolution of 3 km×3 km. Coefficients of Variation were estimated for each grid cell density, as an indication of confidence in predictions. Offshore wind farm sensitivity scores were compiled for seabird species using English territorial waters. The comparative risks to each species of collision with turbines and displacement from operational turbines were reviewed and scored separately, and the scores were multiplied by the bird density estimates to produce relative sensitivity maps. The sensitivity maps reflected well the amassed distributions of the most sensitive species. SeaMaST is an important new tool for assessing potential impacts on seabird populations from offshore development at a time when multiple large areas of development are proposed which overlap with many seabird species' ranges. It will inform marine spatial planning as well as identifying priority areas of sea usage by marine birds. Example SeaMaST outputs are presented. PMID:25210739

  4. U. S. -French Cooperative Research Program: U. S. test results for cable insulation and jacket materials at the completion of accelerated aging

    SciTech Connect

    Bustard, L.D.

    1984-01-01

    Eight different U.S. insulation and jacket products have been accelerated aged at Sandia. The experimental variables included: (1) sequential versus simultaneous accelerated aging exposures; (2) the order of the sequential exposures; and (3) ambient versus 70/sup 0/C irradiation temperatures during sequential aging exposures. We observed that the irradiation temperature (70/sup 0/C or ambient) was secondary in importance to the choice of sequence for thermal and radiation aging. For most materials studied (except TEFZEL) the irradiation then thermal aging sequence was as severe or more severe than the thermal then irradiation aging sequence.

  5. Wind/Wave Misalignment in the Loads Analysis of a Floating Offshore Wind Turbine: Preprint

    SciTech Connect

    Barj, L.; Stewart, S.; Stewart, G.; Lackner, M.; Jonkman, J.; Robertson, A.

    2014-02-01

    Wind resources far from the shore and in deeper seas have encouraged the offshore wind industry to look into floating platforms. The International Electrotechnical Commission (IEC) is developing a new technical specification for the design of floating offshore wind turbines that extends existing design standards for land-based and fixed-bottom offshore wind turbines. The work summarized in this paper supports the development of best practices and simulation requirements in the loads analysis of floating offshore wind turbines by examining the impact of wind/wave misalignment on the system loads under normal operation. Simulations of the OC3-Hywind floating offshore wind turbine system under a wide range of wind speeds, significant wave heights, peak-spectral periods and wind/wave misalignments have been carried out with the aero-servo-hydro-elastic tool FAST [4]. The extreme and fatigue loads have been calculated for all the simulations. The extreme and fatigue loading as a function of wind/wave misalignment have been represented as load roses and a directional binning sensitivity study has been carried out. This study focused on identifying the number and type of wind/wave misalignment simulations needed to accurately capture the extreme and fatigue loads of the system in all possible metocean conditions considered, and for a down-selected set identified as the generic US East Coast site. For this axisymmetric platform, perpendicular wind and waves play an important role in the support structure and including these cases in the design loads analysis can improve the estimation of extreme and fatigue loads. However, most structural locations see their highest extreme and fatigue loads with aligned wind and waves. These results are specific to the spar type platform, but it is expected that the results presented here will be similar to other floating platforms.

  6. How ARCO drills high-angle wells offshore Indonesia

    SciTech Connect

    Tjondrodiputro, B.; Eddyarso, H.; Jones, K. (Atlantic Richfield Indonesia, Inc., Jakarta (Indonesia))

    1993-04-01

    As described in Part 1, Atlantic Richfield Indonesia, Inc. (ARII) drilled 28 high-angle wells between early 1986 and October 1990, in its Offshore North West Java contract area. Drilling techniques for these wells were detailed, including descriptions of the bottom-hole assemblies, casing and mud programs, hole cleaning and logging. This concluding article of the two-part series discusses ARII's completion methods for the 28 wells.A key cost saving feature of the completions was use of a predrilled 7-in. production liner in the long horizontal sections, instead of a cemented and perforated liner. This type of completion was possible because the principal target zone is a highly compacted limestone. Described here are perforation wash tool operations and installation of electric submersible pumps. Production performance is analyzed to explain high-angle well advantages over vertical wells in Bima field. Application of production logging tools with a coiled tubing system are overviewed.

  7. The geotechnical centrifuge in offshore engineering

    SciTech Connect

    Murff, J.D.

    1996-12-31

    One of the greatest needs in offshore geotechnical engineering is for large scale test measurements on which to calibrate design procedures. The geotechnical centrifuge offers at least a partial remedy. Because it allows one to properly simulate stresses, it is a legitimate, relatively inexpensive option to full scale field testing. As such it is a valuable technique and can be an excellent complement to laboratory tests, 1-g model tests and numerical analyses. However, it has not been widely used by industry even though the capability has existed for almost thirty years. This paper argues that this technology should gain acceptance beyond the research community. The paper presents an overview of centrifuge principles, philosophies of use, and limitations of the technique. For illustration, several actual applications of centrifuge testing for complex offshore problems are described. Results are shown to provide important insights into prototype behavior and to agree well with full scale measurements where these are available.

  8. Compensation technology for a novel reflex optical fiber temperature sensor used under offshore oil well

    Microsoft Academic Search

    Yong Zhao; Yanbiao Liao

    2003-01-01

    We propose a semiconductor absorption optical fiber temperature sensor adapted to offshore explorations. The sensing mechanism relies on the well-known temperature induced shift of the optical absorption edge of GaAs. The sensor system uses a common-path reference measurement method combined with a node-type error compensation technology. This allows to correct for errors caused by fluctuations of the light intensity level,

  9. The Offshore East African Rift System

    NASA Astrophysics Data System (ADS)

    Franke, D.; Klimke, J.; Jokat, W.; Stollhofen, H.; Mahanjane, S.

    2014-12-01

    Numerous studies have addressed various aspects of the East African Rift system but surprisingly few on the offshore continuation of the south-eastern branch of the rift into the Mozambique Channel. The most prominent article has been published almost 30 years ago by Mougenot et al. (1986) and is based on vintage seismic data. Several studies investigating earthquakes and plate motions from GPS measurements reveal recent deformation along the offshore branch of the East African Rift system. Slip vectors from earthquakes data in Mozambique's offshore basins show a consistent NE direction. Fault plane solutions reveal ~ E-W extensional failure with focal depth clustering around 19 km and 40 km, respectively. Here, we present new evidence for neotectonic deformation derived from modern seismic reflection data and supported by additional geophysical data. The modern rift system obviously reactivates structures from the disintegration of eastern Gondwana. During the Jurassic/Cretaceous opening of the Somali and Mozambique Basins, Madagascar moved southwards along a major shear zone, to its present position. Since the Miocene, parts of the shear zone became reactivated and structurally overprinted by the East African rift system. The Kerimbas Graben offshore northern Mozambique is the most prominent manifestation of recent extensional deformation. Bathymetry data shows that it deepens northwards, with approximately 700 m downthrown on the eastern shoulder. The graben can be subdivided into four subbasins by crosscutting structural lineaments with a NW-SE trend. Together with the N-S striking graben-bounding faults, this resembles a conjugate fault system. In seismic reflection data normal faulting is distinct not only at the earthquake epicenters. The faults cut through the sedimentary successions and typically reach the seafloor, indicating ongoing recent deformation. Reference: Mougenot, D., Recq, M., Virlogeux, P., and Lepvrier, C., 1986, Seaward extension of the East African Rift: Nature, v. 321, p. 599-603

  10. Platforms will handle sour streams offshore India

    SciTech Connect

    NONE

    1997-07-21

    The recently installed Panna facilities, offshore the west coast of India, are designed to produce 50,000 b/d of highly paraffinic, sour oil, 180 MM-scfd of sour gas, and 100,000 bw/d. The field lies in about 154 ft of water. Enron Oil and Gas India Ltd. is operator. Enercon Engineering Inc., Houston, provided detailed design, procurement, and inspection services for the development that includes installation of six platforms and 22 pipelines.

  11. Float pump offshore wave energy converters

    SciTech Connect

    Nielsen, K. [Danish Wave Power Aps, Virum (Denmark)

    1996-12-31

    This paper will describe the numerical design models developed by DWP and ES-Consult as part of the Off-shore Wave Energy Converter project OWEC-1 supported by the European Union under the JOULE initiative. Offshore Wave Power Plants composed of float pump systems, has been investigated. Modeling techniques required to provide reliable methods for the predicted hydrodynamic behavior of the floats, their performance has been assessed and standardized criteria and techniques for the design has been provided. The systems investigated and the numerical time domain models developed will be described. The DWP/ES-Consult design models include both heave and surge motion of the device motion. The hydrodynamics are based on the long wave approximation of wave exiting forces as well as nonlinear drag and lift-forces, limits for the buoyancy force and variation of added mass with submergence are included in the calculations. The numerical models developed by DWP/ES-Consult are intended as tools for the structural design. The results in medium waves are compared to more exact hydrodynamic models (heave only) developed at Chalmars University and at NTH norwegian Technical University. Results are compared to model tests and real sea measurements. The design of the float geometry`s and power takeoff has not been optimized. The scope has been to compare and provide tools and guidelines for time domain modeling of offshore wave energy converters as a basis for further optimization.

  12. Smoke dispersion around complex offshore structure

    SciTech Connect

    Moros, A.; Webb, S.; Fells, C. [BP International, Sunbury-on-Thames (United Kingdom); Bonn, R. [BP Exploration, Aberdeen (United Kingdom)

    1994-12-31

    Fires on offshore installations can produce large quantities of smoke. Although it is important to know the fire behavior and its effects on the structures it is equally important to know the smoke behavior in and around the platform. High levels of smoke can affect the safety of the personnel. This work describes a comparison of a Computational Fluid Dynamics (CFD) model with field experiments conducted on a North Sea Platform. The purpose of the work is to use CFD to assess the smoke behavior on offshore platforms. To validate the model for such studies, a series of experiments were performed during which small amounts ({approximately}0.5 kg/s) of synthetic smoke were released at given locations on the platform. The resulting plume concentration was measured at four points around the platform-n using optical densitometers. During the experiments the wind field at different locations around the platform was also measured. The results of this validation indicate that simulation tools can be used to predict global smoke movement and concentrations in complex offshore structures to within the required accuracies. On average, the predicted wind flow is to within a factor of 2 of the measured values and in some areas to within 50%. The predicted concentrations are to within a factor of two of the measured values except one point where the predictions were an order of magnitude less than the measurements.

  13. 26th Annual offshore technology conference: 1994 Proceedings

    SciTech Connect

    Not Available

    1994-01-01

    This conference represents the world's largest and most comprehensive technical conference and exhibition on offshore resource development. The four proceedings volumes have been separated by major areas of interest with this volume containing papers relative to design of offshore platforms and marine riser systems. Papers deal with design, installation, fabrication, transport systems, mooring devices, repair methods, and development of satellite production facilities. Case histories on various offshore oil and gas fills are discussed along with economics of some applications and designs.

  14. 78 FR 34568 - Special Local Regulation; Heritage Coast Offshore Grand Prix, Tawas Bay; East Tawas, MI

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-06-10

    ...Regulation; Heritage Coast Offshore Grand Prix, Tawas Bay; East Tawas, MI AGENCY...after the Heritage Coast Offshore Grand Prix boat race. This special local regulation...Regulation; Heritage Coast Offshore Grand Prix, East Tawas, MI. (a) Regulated...

  15. 46 CFR 11.468 - Officer endorsements for mobile offshore drilling units.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...Officer endorsements for mobile offshore drilling units. 11.468 Section 11.468...Officer endorsements for mobile offshore drilling units. Officer endorsements for service on mobile offshore drilling units (MODUs) authorize...

  16. 46 CFR 2.10-130 - Fees for examination of foreign mobile offshore drilling units.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...for examination of foreign mobile offshore drilling units. 2.10-130 Section 2.10-130...for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

  17. 46 CFR 2.10-130 - Fees for examination of foreign mobile offshore drilling units.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...for examination of foreign mobile offshore drilling units. 2.10-130 Section 2.10-130...for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

  18. 46 CFR 11.468 - Officer endorsements for mobile offshore drilling units.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...Officer endorsements for mobile offshore drilling units. 11.468 Section 11.468...Officer endorsements for mobile offshore drilling units. Officer endorsements for service on mobile offshore drilling units (MODUs) authorize...

  19. 46 CFR 11.468 - Officer endorsements for mobile offshore drilling units.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...Officer endorsements for mobile offshore drilling units. 11.468 Section 11.468...Officer endorsements for mobile offshore drilling units. Officer endorsements for service on mobile offshore drilling units (MODUs) authorize...

  20. 46 CFR 2.10-130 - Fees for examination of foreign mobile offshore drilling units.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...for examination of foreign mobile offshore drilling units. 2.10-130 Section 2.10-130...for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

  1. 46 CFR 2.10-130 - Fees for examination of foreign mobile offshore drilling units.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...for examination of foreign mobile offshore drilling units. 2.10-130 Section 2.10-130...for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

  2. 46 CFR 11.468 - Officer endorsements for mobile offshore drilling units.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...Officer endorsements for mobile offshore drilling units. 11.468 Section 11.468...Officer endorsements for mobile offshore drilling units. Officer endorsements for service on mobile offshore drilling units (MODUs) authorize...

  3. 46 CFR 2.10-130 - Fees for examination of foreign mobile offshore drilling units.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...for examination of foreign mobile offshore drilling units. 2.10-130 Section 2.10-130...for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

  4. 75 FR 29397 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-26

    ...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling By the authority...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling (the ``Commission...and mitigating the impact of, oil spills associated with offshore...

  5. Mooring Line Modelling and Design Optimization of Floating Offshore Wind Turbines

    E-print Network

    Victoria, University of

    Mooring Line Modelling and Design Optimization of Floating Offshore Wind Turbines by Matthew Thomas Mooring Line Modelling and Design Optimization of Floating Offshore Wind Turbines by Matthew Thomas Jair. Curran Crawford, Supervisor (Department of Mechanical Engineering) ABSTRACT Floating offshore wind

  6. 75 FR 12560 - Certificate of Alternative Compliance for the Offshore Supply Vessel BUMBLE BEE

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-16

    ...maneuver within close proximity of offshore platforms. Due to the design of the...susceptible to damage from offshore platforms. Locating the sidelights 12...maneuvering within close proximity to offshore platforms. In addition the forward...

  7. 75 FR 20372 - Certificate of Alternative Compliance for the Offshore Supply Vessel RIG RUNNER

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-19

    ...89, has been issued for the offshore supply vessel RIG RUNNER, O...maneuver within close proximity of offshore platforms. The forward masthead light...working in close proximity to offshore platforms. Furthermore the...

  8. 75 FR 418 - Certificate of Alternative Compliance for the Offshore Supply Vessel KELLY ANN CANDIES

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-01-05

    ...INFORMATION: Background and Purpose The offshore supply vessel KELLY ANN CANDIES will be used for offshore supply operations. Full compliance...to maneuver within close proximity of offshore platforms and conduct helicopter...

  9. 75 FR 32802 - Certificate of Alternative Compliance for the Offshore Supply Vessel ROSS CANDIES

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-09

    ...part 81, has been issued for the offshore supply vessel ROSS CANDIES, O...maneuver within close proximity of offshore platforms. The horizontal distance between...part 81, has been issued for the offshore supply vessel ROSS CANDIES,...

  10. 75 FR 36106 - Certificate of Alternative Compliance for the Offshore Supply Vessel SOUTHERN CROSS

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-24

    ...maneuver within close proximity to offshore platforms. Placing the aft masthead...susceptible to damage from offshore platforms. Locating the side lights...maneuvering within close proximity to offshore platforms. The Certificate of...

  11. 75 FR 32803 - Certificate of Alternative Compliance for the Offshore Supply Vessel JONCADE

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-09

    ...89, has been issued for the offshore supply vessel JONCADE, O...maneuver within close proximity of offshore platforms. The forward masthead light...working in close proximity to offshore platforms. Furthermore the...

  12. 75 FR 39956 - Certificate of Alternative Compliance for the Offshore Supply Vessel MARIE ELISE

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-13

    ...maneuver within close proximity to offshore platforms. Placing the aft masthead...susceptible to damage from offshore platforms. Locating the side lights...maneuvering within close proximity to offshore platforms. The Certificate of...

  13. 75 FR 29569 - Certificate of Alternative Compliance for the Offshore Supply Vessel JANSON R. GRAHAM

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-05-26

    ...89, has been issued for the offshore supply vessel JANSON R. GRAHAM...maneuver within close proximity of offshore platforms. The forward masthead light...working in close proximity to offshore platforms. Additionally, the...

  14. The outsourcing and offshoring competitive landscape and its uncertainties

    E-print Network

    Sultan, Ziad R. (Ziad Raymond)

    2005-01-01

    The outsourcing and offshoring competitive landscape is rapidly and constantly evolving, presenting new challenges and opportunities for providers and customers alike. Outsourcing providers are pressured to increase the ...

  15. Operational Impacts of Large Deployments of Offshore Wind (Poster)

    SciTech Connect

    Ibanez, E.; Heaney, M.

    2014-10-01

    The potential operational impact of deploying 54 GW of offshore wind in the United States was examined. The capacity was not evenly distributed; instead, it was concentrated in regions with better wind quality and close to load centers (Table 1). A statistical analysis of offshore wind power time series was used to assess the effect on the power system. The behavior of offshore wind resembled that of onshore wind, despite the former presenting higher capacity factors, more consistent power output across seasons, and higher variability levels. Thus, methods developed to manage onshore wind variability can be extended and applied to offshore wind.

  16. Articulated stable offshore platforms: With buoys attached via universal joints, ASOP`S configuration minimizes transmission of forces, moments to the platform hull

    SciTech Connect

    Grinius, V.G. [Offshore Model Basin, Escondido, CA (United States); Mooney, J.B. [Consultant, Arlington, VA (United States); Mills, T.R.J. [McDermott Engineering Houston, Inc., TX (United States)

    1996-04-01

    Articulated stable offshore platforms (ASOP) are a vessel concept that can provide a very stable floating platform at sea. The concept lends itself to two distinct types of offshore platforms: (1) a system that can produce, store, and offload oil (FPSO) and (2) a mobile system that can be self-propelled and provide a stable platform for uses such as a floating production system (FPS) and/or any other commercial or military need that requires a very stable deck. An ASOP concept was originally developed in the early 1970s by Offshore Model Basin (OMB), then known as Offshore Technology Corp. Patents were granted in 1974 and 1975. A design for an oil storage and a self-propelled, highly mobile, exploratory drilling rig was among several of the concepts. There was extensive model testing performed on these designs, and the results were very favorable inasmuch as they showed an improvement when compared to similar use platforms.

  17. Towards Sustainable Offshore Outsourcing: An Empirical Study on Canadian Manufacturing Small and Medium Size

    E-print Network

    Towards Sustainable Offshore Outsourcing: An Empirical Study on Canadian Manufacturing Small Manufacturing small and medium size enterprises (SMEs) are increasingly jumping onto the offshore outsourcing

  18. Offshore Wind Turbines - Estimated Noise from Offshore Wind Turbine, Monhegan Island, Maine: Environmental Effects of Offshore Wind Energy Development

    SciTech Connect

    Aker, Pamela M.; Jones, Anthony M.; Copping, Andrea E.

    2010-11-23

    Deep C Wind, a consortium headed by the University of Maine will test the first U.S. offshore wind platforms in 2012. In advance of final siting and permitting of the test turbines off Monhegan Island, residents of the island off Maine require reassurance that the noise levels from the test turbines will not disturb them. Pacific Northwest National Laboratory, at the request of the University of Maine, and with the support of the U.S. Department of Energy Wind Program, modeled the acoustic output of the planned test turbines.

  19. The offshore-ring: A new system design for the open ocean aquaculture of macroalgae

    Microsoft Academic Search

    Bela Hieronymus Buck; Cornelia Maria Buchholz

    2004-01-01

    Mass culture of benthic macroalgae under rough offshore conditions in the North Sea requires rigid culture support systems that cannot only withstand rough weather conditions but can also be effectively handled while at the same time retain the cultured species. Various carrier constructions and different mooring systems were tested. Laminaria saccharina grew on all of these carriers with initially high

  20. Optimizing safety by inherent offshore platform design

    SciTech Connect

    Mansfield, D.P. [AEA Technology, Risley (United Kingdom); Kletz, T.A. [Kletz (T.A.), Cheadle (United Kingdom); Al-Hassan, T. [HSE Offshore Safety Div., Bootle (United Kingdom)

    1996-12-31

    Following the Cullen Report into the Piper Alpha Disaster, UK Operators and the Health and Safety Executive Offshore Safety Division (OSD) have been working together to bring in a new safety regime, progressively replacing prescriptive requirements with goal setting regulations to enable a more integrated approach to hazard management. This is allowing the industry to be more flexible and specific about the way it manages hazards throughout the life of the installation. In particular it is encouraging a hazards based focus to design which is changing the way installations are designed and which would promote the use of inherently safer design. Conventional installation design often relies on standard specification engineered safety systems such as shutdown systems and water deluge to control hazards, with less attention paid to minimizing the hazards at source. These add-on safety systems can be expensive to install and maintain, and may only be effective in some circumstances. This paper reports on a pilot study sponsored by OSD, involving offshore operators and design contractors, to assess the status of inherent safety in offshore installation design in the UK and to encourage its further use spreading best practice and examples of the benefits of the approach. The paper outlines the key considerations for implementation of inherently safer design, and describes some of the benefits these can bring to the industry. It also highlights the role regulations, industry initiatives and guidance can play in promoting inherently safer design both now and in the future. The study`s findings suggest that awareness of the inherent safety principles is limited to some safety specialists and designers, but that the industry is beginning to recognize the role and benefits of inherent safety. As a result its principles are starting to appear in some design procedures and hazard management guides.

  1. Quantifying Offshore Wind Resources from Satellite Wind Maps

    E-print Network

    Pryor, Sara C.

    through footprint area averaging per image. Secondly, these data are averaged in time to provide a local of the Horns Rev wind farm is quantified from satellite SAR images and compared with state-of-the-art wake; offshore wake #12;It is highly innovative to estimate the offshore wind resource based on satellite images

  2. Offshore spawning by the portunid crab Scylla serrata (Crustacea: Decapoda)

    Microsoft Academic Search

    B. J. Hill

    1994-01-01

    The portunid crabScylla serrata (Forskål) is shown to migrate offshore to spawn. Records of 447S. serrata caught as bycatch by trawlers in the tropical waters of northern Australia were analysed with respect to area, depth, distance offshore and month of capture as well as the sex and size of the crabs and whether the females were ovigerous. The crabs were

  3. Ris National Laboratory Satellite SAR applied in offshore wind

    E-print Network

    Risø National Laboratory Satellite SAR applied in offshore wind ressource mapping: possibilities is to quantify the regional offshore wind climate for wind energy application based on satellite SAR ·Study of 85 ERS-2 SAR scenes ·Using CMOD4 (Stoffelen and Anderson, 1997) Wind from SAR #12;Study site: Horns Rev

  4. OPTIMAL DEVELOPMENT PLANNING OF OFFSHORE OIL AND GAS FIELD

    E-print Network

    Grossmann, Ignacio E.

    , well drilling schedule and production profiles of oil, water and gas in each time period. The model canOPTIMAL DEVELOPMENT PLANNING OF OFFSHORE OIL AND GAS FIELD INFRASTRUCTURE UNDER COMPLEX FISCAL Pittsburgh, PA 15213 Abstract The optimal development planning of offshore oil and gas fields has received

  5. Anchoring systems for marine renewable energies offshore platforms

    Microsoft Academic Search

    R. Rodriguez; I. Gorrochategui; C. Vidal; R. Guanche; J. Canizal; J. A. Fraguela; V. Diaz

    2011-01-01

    At present no specific methodologies have been developed for the design of the anchoring systems of offshore moored platforms, individual and in farm configuration, for obtaining renewable energy. This paper presents a R&D project whose objective is to cover this lack of knowledge. The scope of the project involves several areas of scientific expertise such as Soil Mechanics, Hydrodynamics, Offshore

  6. Riser and wellhead monitoring for improved offshore drilling operations

    E-print Network

    Nørvåg, Kjetil

    Riser and wellhead monitoring for improved offshore drilling operations Gullik A. Jensen, Ph ­ Offshore drilling with riser ­ On the riser and the riser joints ­ On damage and consequences · Operational Page 2 #12;The KONGSBERG Riser Management Systems (RMS) Integrity of drilling riser based on monitoring

  7. Dresser-Rand Offshore Baseplate Project Project Summary

    E-print Network

    Demirel, Melik C.

    the cost. The project focused on reevaluating the baseplate design using modern analysis toolsDresser-Rand Offshore Baseplate Project Project Summary Baseplates are utilized in offshore, with recent rises in material and manufacturing costs, there is a desire to minimize the excess and reduce

  8. EGG LOSS DURING INCUBATION FROM OFFSHORE NORTHERN LOBSTERS (DECAPODA: HOMARIDAE)

    E-print Network

    EGG LOSS DURING INCUBATION FROM OFFSHORE NORTHERN LOBSTERS (DECAPODA: HOMARIDAE) HERBERT C. PERKINS' ABSTRACT Egg loss during incubation from offshore northern lobsters, Homaru8 americanus Milne Edwards, was estimated by counting the eggs of 196 females. The lobsters were captured along the continental shelf off

  9. Offshore Heavy Oil in Campos Basin: The Petrobras Experience

    Microsoft Academic Search

    A. C. Capeleiro Pinto; C. C. M. Branco; J. S. de Matos; P. M. Vieira; S. da Silva Guedes; C. Pedroso Jr; A. C. Decnop Coelho; M. M. Ceciliano

    2003-01-01

    This paper was selected for presentation by an OTC Program Committee following review of information contained in an abstract submitted by the author(s). Contents of the paper, as presented, have not been reviewed by the Offshore Technology Conference and are subject to correction by the author(s). The material, as presented, does not necessarily reflect any position of the Offshore Technology

  10. A critique of offshore liquefied natural gas (LNG) terminal policy

    Microsoft Academic Search

    William D. Whitmore; Vern K. Baxter; Shirley L. Laska

    2009-01-01

    The Maritime Transportation Security Act of 2002 amended the Deepwater Port Act of 1974 to permit the construction of offshore liquefied natural gas (LNG) terminals. Terminals with environmentally destructive open-loop regasification systems were quickly approved in the Gulf of Mexico. This study analyzed the political methods of the George W. Bush administration to determine how it developed offshore LNG. Findings

  11. DISCIPLINER LES CENTRES FINANCIERS OFFSHORE : INCITATION PAR LA PRESSION INTERNATIONALE

    Microsoft Academic Search

    Arnaud BOURGAIN; Patrice PIERETTI

    2007-01-01

    Since Offshore Financial Centers (OFCs) generally provide bank secrecy to foreign investors they are likely to attract criminal money. Recently however, academic writings have pointed to the fact that OFCs might have beneficial economic effects. In this context, we address the question whether pressure exerted by international organizations on offshore financial centers may be effective enough to enforce compliance with

  12. Oil rigs and offshore sport fishing in Louisiana

    Microsoft Academic Search

    R. Dugas; V. Guillory; M. Fischer

    2009-01-01

    Forty years ago, offshore sport fishing in Louisiana was almost nonexistent. Offshore oil drilling platforms are the primary cause of the present increase in sport fishing in this area. Algae and other organisms forming the first step in the food chain cluster around the subsurface structures of the rigs, attracting fish that seek food and shelter. Major game species frequenting

  13. Oil rigs and offshore sport fishing in Louisiana

    Microsoft Academic Search

    R. Dugas; V. Guillory; M. Fischer

    1979-01-01

    The environmental effects of Louisiana's offshore oil platforms are discussed with regard to an increase in sport-fishing. The effects upon fish populations, species diversity, underwater habitats, and food chains from the offshore platforms are obtained from several summaries of studies undertaken between 1970-1979. (DS)

  14. Wave Models for Offshore Wind Turbines Puneet Agarwal

    E-print Network

    Manuel, Lance

    Wave Models for Offshore Wind Turbines Puneet Agarwal§ and Lance Manuely Department of Civil practice for modeling waves on offshore wind turbines is limited to the representation of linear irregular for the turbine and for the input wind/wave conditions. While for the wind, inflow turbu- lence models are fairly

  15. Foundation modelling to assess dynamic behaviour of offshore wind turbines

    Microsoft Academic Search

    M. B. Zaaijer

    2006-01-01

    The dynamic behaviour of wind turbines at offshore locations is more complex than that of both onshore wind turbines and offshore platforms used in the oil and gas industry. In order to reduce the computational burden, the work presented in this paper aims at simplification of the dynamic model of the foundation, while maintaining sufficient accuracy. A stiffness matrix at

  16. The Future of Offshore Wind Power is Built Onshore

    Microsoft Academic Search

    Esa Holttinen; Jarmo Huttunen; Ilari Silvola; Aleksi Lumijärvi

    Summary: The investment costs for the offshore wind farms are 30 to 100 % higher than onshore. High installation costs, weather constraints and environmental issues all add uncertainty to the viability of investments. Several new innova- tive installation methods have been suggested. Hollming Mechanical Engineering Division has a long tradition as a supplier for the offshore and shipbuilding industries. In

  17. The concept of self-maintained offshore wind turbines

    Microsoft Academic Search

    E. Echavarria; T. Tomiyama; G. J. W. van Bussel

    Summary The objective of on-going research on the concept of self-maintained offshore wind turbines is to develop a design methodology to increase the availability for offshore wind farms, by means of an intelligent maintenance system capable of responding to faults by reconfiguring the system or subsystems, without increasing service visits, economics, or complexity. The design methodology explained in the paper

  18. Maintenance strategies for deep-sea offshore wind turbines

    Microsoft Academic Search

    Ingrid Bouwer Utne

    2010-01-01

    Purpose – The objective of this paper is to outline a framework that guides the development of sound maintenance strategies and policies for deep-sea offshore wind turbines. Design\\/methodology\\/approach – An important challenge with offshore wind energy production is to reduce the high operation and maintenance costs. To decrease complexity, and structure the maintenance strategy developing process, systems engineering principles are

  19. Taming Hurricanes With Arrays of Offshore Wind Turbines

    E-print Network

    Firestone, Jeremy

    Taming Hurricanes With Arrays of Offshore Wind Turbines Mark Z. Jacobson Cristina Archer, Willet #12;Representation of a vertically-resolved wind turbine in model Lines are model layers) or 50 m/s (destruction) speed. Can Walls of Offshore Wind Turbines Dissipate Hurricanes? #12;Katrina

  20. Design of support structures for offshore wind turbines

    Microsoft Academic Search

    J. van der Tempel

    2006-01-01

    To meet growing energy demands, the Kyoto protocol and the much desired diversification of supply, wind energy has become a mainstream source of energy in the EU. Cost wise it is already competing with gas fired electricity. In the last decade wind moved offshore to accommodate even more wind power. The offshore wind resource is more abundant and of a

  1. Loss of genetic diversity in Harpacticoida near offshore platforms

    Microsoft Academic Search

    P. A. Montagna

    1996-01-01

    Offshore oil and gas production platforms can be a source of chronic stress that could lead to sublethal impacts on resident benthic organisms. In June 1993 and January 1994, genetic diversity of Harpacticoida (Copepoda) living proximal to operating, offshore platforms in the Gulf of Mexico was estimated to test if platforms are associated with strong selective pressures. Because harpacticoids have

  2. Wind Resource Mapping for United States Offshore Areas: Preprint

    SciTech Connect

    Elliott, D.; Schwartz, M.

    2006-06-01

    The U.S. Department of Energy's (DOE) National Renewable Energy Laboratory (NREL) is producing validated wind resource maps for priority offshore regions of the United States. This report describes the methodology used to validate the maps and to build a Geographic Information Systems (GIS) database to classify the offshore wind resource by state, water depth, distance from shore, and administrative unit.

  3. Structural monitoring of offshore platforms using impulse and relaxation response

    Microsoft Academic Search

    Lalu Mangal; V. G Idichandy; C Ganapathy

    2001-01-01

    Monitoring offshore platforms, long span bridges, high rise buildings, TV towers and other similar structures is essential for ensuring their safety in service. Continuous monitoring assumes even greater significance in the case of offshore platforms, which are highly susceptible to damage due to the corrosive environment and the continuous action of waves. Also, since a major part of the structure

  4. Determination of human error probabilities for offshore platform musters

    Microsoft Academic Search

    Dino G. DiMattia; Faisal I. Khan; Paul R. Amyotte

    2005-01-01

    The focus of this work is on prediction of human error probabilities during the process of emergency musters on offshore oil and gas production platforms. Due to a lack of human error databases, and in particular human error data for offshore platform musters, an expert judgment technique, the Success Likelihood Index Methodology (SLIM), was adopted as a vehicle to predict

  5. Cathodic protection retrofit of an offshore pipeline

    SciTech Connect

    Winters, R.H.; Holk, A.C. [Tenneco Energy, Houston, TX (United States)

    1997-09-01

    The cathodic protection anodes and corrosion coating on two 8-inch (203.2 mm) outside diameter (O.D.) offshore pipelines were damaged during deep water ({minus}380 feet, {minus}116 m) installation. In-situ methods for deep water inspection and repair of the pipelines` cathodic protection and coating systems were developed and performed. Methods are described in which underwater anode retrofits were performed and friction welding technology was used to re-attach anode leads. Standard procedures for underwater pipeline coating repair and remediation of damaged line pipe are provided.

  6. Ultrasonic thickness testing of aging offshore structures

    E-print Network

    Ellison, Brian Kirk

    1999-01-01

    August 1999 Major Subject: Civil Engineering ULTRASONIC THICKNESS TESTING OF AGING OFFSHORE STRUCTURES A Thesis by BRIAN KIRK ELLISON Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER... as series to show the longitudinal thickness variations. Averages among all rays and all rings were also plotted. For Member 01 (R), they are shown in Figs. 2. 7 to 2. 10. 0. 350 0. 340 0. 330 @ 0. 320 EQ 0. 310 Q 0. 300 ~o 0. 290 Z 0. 260 0. 270...

  7. High-alloy materials for offshore applications

    SciTech Connect

    Lemke, T.F.; Harris, J.A.

    1983-05-01

    High-alloy materials possessing good corrosion resistance in hot, sour brines are being seriously considered for offshore applications. These alloys are available in a wide range of strength levels which can be attained by the methods of cold working or precipitation hardening. Results of testing INCONEL alloys 625 and 718 and INCOLOY alloys 825 and 925 for resistance to general corrosion, hydrogen embrittlement, and stress-corrosion cracking (SCC) are presented. This paper also contrasts the range of mechanical properties available in precipitation-hardened materials with properties of cold-worked alloys.

  8. The potential role of offshore standby/rescue ships

    SciTech Connect

    McDonald, H.G.

    1985-01-01

    The loss of the drilling rig ''Sea Gem'' in 1966, in which thirteen people died, was perhaps the first occasion when a major accident connected with offshore explorations and production in the UK Sector of the North Sea resulted in multiple deaths. Since then, loss of life among offshore workers, either through major accidents or individuals falling overboard, has continued to occur throughout the various operational areas worldwide. One method of increasing the survival chances of maritime casualties associated with offshore installations is to ensure that a designated rescue vessel is always available to attempt a rescue. At present in the UK, Regulation 10 of the Offshore Installations (Emergency Producures) Regulations 1976, lays down that a standby vessel should be present within five miles of every manned offshore installation, ready to give assistance in an emergency, able to accommodate the entire crew of the installation, and provide aid for them all.

  9. Offshore finfish aquaculture in the United States: An examination of federal laws that could be used to address environmental and occupational public health risks.

    PubMed

    Fry, Jillian P; Love, David C; Shukla, Arunima; Lee, Ryan M

    2014-11-01

    Half of the world's edible seafood comes from aquaculture, and the United States (US) government is working to develop an offshore finfish aquaculture industry in federal waters. To date, US aquaculture has largely been regulated at the state level, and creating an offshore aquaculture industry will require the development of a new regulatory structure. Some aquaculture practices involve hazardous working conditions and the use of veterinary drugs, agrochemicals, and questionable farming methods, which could raise environmental and occupational public health concerns if these methods are employed in the offshore finfish industry in the US. This policy analysis aims to inform public health professionals and other stakeholders in the policy debate regarding how offshore finfish aquaculture should be regulated in the US to protect human health; previous policy analyses on this topic have focused on environmental impacts. We identified 20 federal laws related to offshore finfish aquaculture, including 11 that are relevant to preventing, controlling, or monitoring potential public health risks. Given the novelty of the industry in the US, myriad relevant laws, and jurisdictional issues in an offshore setting, federal agencies need to work collaboratively and transparently to ensure that a comprehensive and functional regulatory structure is established that addresses the potential public health risks associated with this type of food production. PMID:25415208

  10. Proceedings of the 15. international conference on offshore mechanics and arctic engineering -- OMAE 1996. Volume 1, Part B: Offshore technology

    SciTech Connect

    Chakrabarti, S.K. [ed.] [Chicago Bridge and Iron Technical Services Co., Plainfield, IL (United States); Pontes, M.T. [ed.] [Inst. Nacional de Engenharia e Tecnologia Industrial, Lisbon (Portugal); Maeda, Hisaaki [ed.] [Univ. of Tokyo (Japan); Falzarano, J. [ed.] [Univ. of New Orleans, LA (United States); Schofield, P. [ed.] [W.S. Atkins, Surrey (United Kingdom); Morrison, D. [ed.] [Shell E and P Technology Co., Houston, TX (United States)

    1996-12-31

    The 49 papers contained in Part B of Volume 1 are arranged under the following topical sections: Computational hydrodynamics; Floating and moored systems; Ocean energy technology; Hydrodynamic design of offshore structures; Design and operation of offshore structures; and Risers and cables. Most of the papers have been processed separately for inclusion on the data base.

  11. Copyright 2000, Offshore Technology Conference This paper was prepared for presentation at the 2000 Offshore Technology Conference held in

    E-print Network

    Griffiths, Gwyn

    Offshore Technology Conference held in Houston, Texas, 1Ð4 May 2000. This paper was selected that flexibility was fundamental to the technology design. Hence for Autosub-1 there was no fixed sensor suiteCopyright 2000, Offshore Technology Conference This paper was prepared for presentation at the 2000

  12. Gladden Pull-Apart Basin, offshore Belize

    SciTech Connect

    Morrice, S. (BNR Ltd., Denver, CO (United States))

    1993-02-01

    The junction of the American and Caribbean plates in Belize has created a complex structural setting for oil and gas exploration. Recent seismic offshore Belize has been used to identify three structural provinces, from west to east: a shallow thrust zone, a narrow upthrown wrench faulted zone and a deeper extensional basin, named the Gladden Pull-Apart Basin. Hydrocarbon leakage from recent fault movement appears to have depleted the shallow structures to the west, but the pull-apart basin has a thick sequence of low-frequency clay-dominated sealing rocks with the potential to preserve hydrocarbon accumulations in Cretaceous carbonate banks. These buried carbonate are of the same age and depositional environment of Mexico's Golden Lane/Tabasco Reforma carbonate banks which are world class giant fields. The Belize and Mexican carbonate banks are within the same Cretaceous depositional basin, the Peten Basin. Seismic interpretations in offshore Belize have been integrated with gravity and magnetic surveys. This provides additional support for the deep extensional basin. The location of the thick Cretaceous carbonate banks is better interpreted with the integration of these three geophysical tools. Airborne geochemical surveys were used to detect the presence of oil seeps on the east and west basin margins.

  13. STATE-OF-THE-ART DESIGN STANDARD SPECIFIC DEVELOPED AND APPLICABLE FOR OFFSHORE WINDTURBINE STRUCTURES

    Microsoft Academic Search

    Tove Feld

    The wind energy industry requires cost-effective design for offshore wind turbine structures in order to make the projects economically viable. The newly issued DNV standard for Design of Offshore Wind Turbine Structures fills a gap within the offshore industry being specific developed and applicable for offshore wind turbine structures. It is based on DNVs experience from participation in more than

  14. Optimal Control of Offshore Indoor Climate Zhenyu Yang and Andrea Valente

    E-print Network

    Yang, Zhenyu

    indoor climate control is very critical to manned offshore platforms in terms of onboard staffs' comfort-and-gas offshore platform by employing some advanced control technique - Model Predictive Control (MPC). The Single for offshore platforms [2]. Even offshore HVAC standards are recent, like the ISO 15138 (2000) and Danish

  15. Analysis of Acoustic Wave and Current Data Offshore of Mytle Beach, South Carolina

    NASA Astrophysics Data System (ADS)

    Fall, K. A.; Wren, A.

    2008-12-01

    Two bottom boundary layer (BBL) instrument frames have been deployed on the shoreface and inner-shelf of Long Bay, South Carolina offshore of Myrtle Beach as part of a South Carolina Sea Grant funded project to measure sediment transport over two hardbottom habitats. The inshore instrument frame is located on an extensive hardbottom surface 850 meters offshore. The second instrumented frame is secured to a hardbottom surface on the inner-shelf at a distance of approximately 2.5 km offshore. The nearshore BBL observing system is composed of a downward-looking RDI/ Teledyne 1200 kHz Pulse-Coherent Acoustic Doppler Current Profiler, an upward-looking Nortek Acoustic Wave and Current Profiler (AWAC), and an Aquatec Acoustic Backscatter Sensor. As part of this larger study, the wave and current data from the AWAC have been analyzed. Long-term continuous time series data include wave height, wave period, directional wave spectra, and the magnitude and direction of currents in the water column. Within the data set are several wave events, including several frontal passages and Tropical Storm Hanna which hit the Myrtle Beach area in early September. Wave data have been correlated with meteorological data, and a comparison of shoreface wave characteristics during each type of event are presented.

  16. Motion performance and mooring system of a floating offshore wind turbine

    NASA Astrophysics Data System (ADS)

    Zhao, Jing; Zhang, Liang; Wu, Haitao

    2012-09-01

    The development of offshore wind farms was originally carried out in shallow water areas with fixed (seabed mounted) structures. However, countries with limited shallow water areas require innovative floating platforms to deploy wind turbines offshore in order to harness wind energy to generate electricity in deep seas. The performances of motion and mooring system dynamics are vital to designing a cost effective and durable floating platform. This paper describes a numerical model to simulate dynamic behavior of a new semi-submersible type floating offshore wind turbine (FOWT) system. The wind turbine was modeled as a wind block with a certain thrust coefficient, and the hydrodynamics and mooring system dynamics of the platform were calculated by SESAM software. The effect of change in environmental conditions on the dynamic response of the system under wave and wind loading was examined. The results indicate that the semi-submersible concept has excellent performance and SESAM could be an effective tool for floating wind turbine design and analysis.

  17. Quantifying the hurricane catastrophe risk to offshore wind power.

    PubMed

    Rose, Stephen; Jaramillo, Paulina; Small, Mitchell J; Apt, Jay

    2013-12-01

    The U.S. Department of Energy has estimated that over 50 GW of offshore wind power will be required for the United States to generate 20% of its electricity from wind. Developers are actively planning offshore wind farms along the U.S. Atlantic and Gulf coasts and several leases have been signed for offshore sites. These planned projects are in areas that are sometimes struck by hurricanes. We present a method to estimate the catastrophe risk to offshore wind power using simulated hurricanes. Using this method, we estimate the fraction of offshore wind power simultaneously offline and the cumulative damage in a region. In Texas, the most vulnerable region we studied, 10% of offshore wind power could be offline simultaneously because of hurricane damage with a 100-year return period and 6% could be destroyed in any 10-year period. We also estimate the risks to single wind farms in four representative locations; we find the risks are significant but lower than those estimated in previously published results. Much of the hurricane risk to offshore wind turbines can be mitigated by designing turbines for higher maximum wind speeds, ensuring that turbine nacelles can turn quickly to track the wind direction even when grid power is lost, and building in areas with lower risk. PMID:23763387

  18. Geospatial characteristics of Florida's coastal and offshore environments: Administrative and political boundaries and offshore sand resources

    USGS Publications Warehouse

    Demopoulos, Amanda W.J.; Foster, Ann M.; Jones, Michal L.; Gualtieri, Daniel J.

    2011-01-01

    The Geospatial Characteristics Geopdf of Florida's Coastal and Offshore Environments is a comprehensive collection of geospatial data describing the political and natural resources of Florida. This interactive map provides spatial information on bathymetry, sand resources, military areas, marine protected areas, cultural resources, locations of submerged cables, and shipping routes. The map should be useful to coastal resource managers and others interested in the administrative and political boundaries of Florida's coastal and offshore region. In particular, as oil and gas explorations continue to expand, the map may be used to explore information regarding sensitive areas and resources in the State of Florida. Users of this geospatial database will find that they have access to synthesized information in a variety of scientific disciplines concerning Florida's coastal zone. This powerful tool provides a one-stop assembly of data that can be tailored to fit the needs of many natural resource managers.

  19. Variable Frequency Operations of an Offshore Wind Power Plant with HVDC-VSC: Preprint

    SciTech Connect

    Gevorgian, V.; Singh, M.; Muljadi, E.

    2011-12-01

    In this paper, a constant Volt/Hz operation applied to the Type 1 wind turbine generator. Various control aspects of Type 1 generators at the plant level and at the turbine level will be investigated. Based on DOE study, wind power generation may reach 330 GW by 2030 at the level of penetration of 20% of the total energy production. From this amount of wind power, 54 GW of wind power will be generated at offshore wind power plants. The deployment of offshore wind power plants requires power transmission from the plant to the load center inland. Since this power transmission requires submarine cable, there is a need to use High-Voltage Direct Current (HVDC) transmission. Otherwise, if the power is transmitted via alternating current, the reactive power generated by the cable capacitance may cause an excessive over voltage in the middle of the transmission distance which requires unnecessary oversized cable voltage breakdown capability. The use of HVDC is usually required for transmission distance longer than 50 kilometers of submarine cables to be economical. The use of HVDC brings another advantage; it is capable of operating at variable frequency. The inland substation will be operated to 60 Hz synched with the grid, the offshore substation can be operated at variable frequency, thus allowing the wind power plant to be operated at constant Volt/Hz. In this paper, a constant Volt/Hz operation applied to the Type 1 wind turbine generator. Various control aspects of Type 1 generators at the plant level and at the turbine level will be investigated.

  20. On the Offshore Advection of Boundary-Layer Structures and the Influence on Offshore Wind Conditions

    NASA Astrophysics Data System (ADS)

    Dörenkämper, Martin; Optis, Michael; Monahan, Adam; Steinfeld, Gerald

    2015-06-01

    The coastal discontinuity imposes strong signals to the atmospheric conditions over the sea that are important for wind-energy potential. Here, we provide a comprehensive investigation of the influence of the land-sea transition on wind conditions in the Baltic Sea using data from an offshore meteorological tower, data from a wind farm, and mesoscale model simulations. Results show a strong induced stable stratification when warm inland air flows over a colder sea. This stratification demonstrates a strong diurnal pattern and is most pronounced in spring when the land-sea temperature difference is greatest. The strength of the induced stratification is proportional to this parameter and inversely proportional to fetch. Extended periods of stable stratification lead to increased influence of inertial oscillations and increased frequency of low-level jets. Furthermore, heterogeneity in land-surface roughness along the coastline is found to produce pronounced horizontal streaks of reduced wind speeds that under stable stratification are advected several tens of kilometres over the sea. The intensity and length of the streaks dampen as atmospheric stability decreases. Increasing sea surface roughness leads to a deformation of these streaks with increasing fetch. Slight changes in wind direction shift the path of these advective streaks, which when passing through an offshore wind farm are found to produce large fluctuations in wind power. Implications of these coastline effects on the accurate modelling and forecasting of offshore wind conditions, as well as damage risk to the turbine, are discussed.

  1. Assessment of Offshore Wind System Design, Safety, and Operation Standards

    SciTech Connect

    Sirnivas, S.; Musial, W.; Bailey, B.; Filippelli, M.

    2014-01-01

    This report is a deliverable for a project sponsored by the U.S. Department of Energy (DOE) entitled National Offshore Wind Energy Resource and Design Data Campaign -- Analysis and Collaboration (contract number DE-EE0005372; prime contractor -- AWS Truepower). The project objective is to supplement, facilitate, and enhance ongoing multiagency efforts to develop an integrated national offshore wind energy data network. The results of this initiative are intended to 1) produce a comprehensive definition of relevant met-ocean resource assets and needs and design standards, and 2) provide a basis for recommendations for meeting offshore wind energy industry data and design certification requirements.

  2. 26th annual offshore technology conference, 1994 proceedings

    SciTech Connect

    Not Available

    1994-01-01

    This conference is the world's largest and most comprehensive technical conference and exhibition on offshore resource development. The four Proceedings volumes have been separated by major areas of interest, with relative sessions included in each volume. This Volume 3 contains information relative to offshore platforms and marine system designs. It describes both the installation and decommissioning of offshore platforms, retrofitting platforms to meet current safety standards, and technology assessments for both drilling and platform designs. Papers are also provided which describe maintenance and repair technologies for damages to platform.

  3. Recent advances in offshore pipeline technology

    SciTech Connect

    Bruschi, R.; Vitali, L. [Snamprogetti S.p.A., Fano (Italy)

    1994-12-31

    Since the pioneering construction of the TRANSMED pipeline system across the Sicily Channel in the early 80`s, offshore pipeline technology has been progressing towards more and more difficult environments. Now the projects envisaged for the 90`s are venturing far beyond the challenges of the recent past. The scope of this paper is to present the recent research efforts aimed at tackling the main design aspects of the new challenges. Particular attention will be given to the experiences and achievements on the last few years in transmission pipelines across the European Continental Shelf, e.g. in the Central and Southern North Sea and across the Mediterranean Sea. Technologies, tools and purpose developed criteria will be discussed. The performance of current operating pipeline systems will be reviewed and incentives to rationalize design criteria and guidelines will be illustrated.

  4. Elsam: Horns Rev Offshore Wind Farm

    NSDL National Science Digital Library

    The Danish energy producing company Elsam is currently building "the world's largest offshore wind farm" in the North Sea. 80 turbines were erected over summer 2002, which was when the project began. The Horns Rev project is part of a long term plan for Denmark to reduce carbon dioxide emissions 50 percent by 2030. A monthly newsletter is published online with all of the developments and milestones accomplished. There is substantial material on the wind farm's construction. The specifications of the turbines are quite impressive. Analysis of wind speeds, water conditions, and other location specific data conveys the complexity of the design process. A description of the various stages of construction is also very interesting.

  5. Underwater wet welding consumables for offshore applications

    SciTech Connect

    Sanchez-Osio, A.; Liu, S.; Olson, D.L. [Colorado School of Mines, Golden, CO (United States). Center for Welding and Joining Research; Ibarra, S. [Amoco Corp. Research, Naperville, IL (United States)

    1993-12-31

    The use of underwater wet welding for offshore repairs has been limited mainly because of porosity in the resulting welds. With appropriate consumable design, however, it is possible to enhance weld metal toughness through microstructural refinement and to reduce porosity. New titanium and boron based consumables have been developed with which high toughness acicular ferrite can be produced in underwater wet welds. Titanium, by means of oxide formation, promoted an increase in weld metal acicular ferrite, while boron additions decreased the amount of grain boundary ferrite, further improving the microstructure. Porosity reduction was possible through the addition of calcium carbonate at approximately 13 wt. % in the coating. However, weld metal decarburization also resulted with the addition.

  6. Greenland unveils terms for offshore licenses

    SciTech Connect

    Not Available

    1992-04-20

    This paper reports that Greenland has spelled out terms for its first round of offshore licensing. The action off western Greenland could lead to the first oil and gas exploration there since an unsuccessful campaign in the 1970s. The Mineral Resources Administration (MRA) for Greenland pegged exploration license terms on 133 blocks, all south of the 66th parallel, at 10 years with options for 2 year extensions to a maximum of 6 more years. The license can cover as many as six blocks. In the first 3 year period companies will have only a seismic obligation of 1,588 km per six blocks. For the second 3 year period there will be a one well obligation and one well in each subsequent 2 year periods.

  7. Offshore structure and method of sinking same

    SciTech Connect

    Fern, D. T.

    1985-02-05

    An offshore structure and a method of skinking it to the sea bed. In accordance with one aspect of this invention, the structure is sunk asymmetrically by first sinking a first end portion thereof and then sinking the other end portion. The first end portion is sunk by ballasting it while the other end portion is closed to ballast. The structure is provided with sufficient water plane area while sinking each end portion to maintain stability during the sinking process. In accordance with another aspect of this invention, at least two spaced-apart piles are provided at the end corresponding to the first end portion to absorb the force of impact with the sea bed and to maintain a skirt on the structure out of contact with the sea bed until both ends of the structure have been sunk to the sea bed.

  8. Environmental load uncertainties for offshore structures

    SciTech Connect

    Nessim, M.A.; Hong, H.P. [Centre for Engineering Research Inc., Edmonton, Alberta (Canada); Jordaan, I.J. [Memorial Univ. of Newfoundland, St. John`s, Newfoundland (Canada). Faculty of Engineering and Applied Science

    1995-11-01

    A methodology for assessing the effect of different sources of uncertainty on the calculation of load effect on offshore structures is presented. A consistent classification of uncertainties was adopted and used as a basis to develop models to estimate the effect of different uncertainties on specified design loads. It is shown that distribution parameter uncertainties arising from limitations on the quantity of statistical data are not likely to have a significant effect on design loads. By contrast, model uncertainties can greatly increase the design loads, and the increase is sensitive to the probabilistic models used to describe model error. The methodology and results can be used by design engineers to take model uncertainties into account in estimating specified loads. They also form the basis for developing and calibrating a new information-sensitive code format.

  9. Method for removing obsolete offshore platforms

    SciTech Connect

    Wang, F.S.; Gautreau, C.T; Heels, R.W; Hein, N.W. Jr.

    1990-02-20

    This patent describes a method for removing an offshore platform anchored to the seabed by hollow pilings. It comprises: establishing an annulus inside one of the pilings at a level below the top of the seabed by lowering a cylindrical member down into the piling and sealing at least the top of the member against the interior of the piling, the displacing the connecting member between the positions, the connecting member being provided with at least one engaging formation; and a locking member engaging the formation and adapted to brace against the other article at least two locations straddling the connecting member for retaining the other article locked to the one of the articles until the locking member is withdrawn from engagement with the formation.

  10. Beyond offshoring: assess your company's global potential.

    PubMed

    Farrell, Diana

    2004-12-01

    In the past few years, companies have become aware that they can slash costs by offshoring: moving jobs to lower-wage locations. But this practice is just the tip of the iceberg in terms of how globalization can transform industries, according to research by the McKinsey Global Institute (MGI). The institute's yearlong study suggests that by streamlining their production processes and supply chains globally, rather than just nationally or regionally, companies can lower their costs-as we've seen in the consumer-electronics and PC industries. Companies can save as much as 70% of their total costs through globalization--50% from offshoring, 5% from training and business-task redesign, and 15% from process improvements. But they don't have to stop there. The cost reductions make it possible to lower prices and expand into new markets, attracting whole new classes of customers. To date, however, few businesses have recognized the full scope of performance improvements that globalization makes possible, much less developed sound strategies for capturing those opportunities. In this article, Diana Farrell, director of MGI, offers a step-by-step approach to doing both things. Among her suggestions: Assess where your industry falls along the globalization spectrum, because not all sectors of the economy face the same challenges and opportunities at the same time. Also, pay attention to production, regulatory, and organizational barriers to globalization. If any of these can be changed, size up the cost-saving (and revenue-generating) opportunities that will emerge for your company as a result of those changes. Farrell also defines the five stages of globalization-market entry, product specialization, value chain disaggregation, value chain reengineering, and the creation of new markets-and notes the different levers for cutting costs and creating value that companies can use in each phase. PMID:15605568

  11. Massive sediment bypassing on the lower shoreface offshore of a wide tidal inlet - Cat Island Pass, Louisiana

    USGS Publications Warehouse

    Jaffe, B.E.; List, J.H.; Sallenger, A.H., Jr.

    1997-01-01

    Analysis of a series of historical bathymetric and shoreline surveys along the Louisiana coast west of the Mississippi River mouth detected a large area of deposition in water depths of 2.0-8.5 m offshore of a 9-km- wide tidal inlet, the Cat Island Pass/Wine Island Pass system. A 59.9 ?? 106 m3 sandy deposit formed from the 1930s-1980s, spanning 27 km in the alongshore direction, delineating the transport pathway for sediment bypassing offshore of the inlet on the shoreface. Bypassing connected the shorefaces of two barrier island systems, the Isles Dernieres and the Bayou Lafourche. The processes responsible for formation of this deposit are not well understood, but sediment-transport modeling suggests that sediment is transported primarily by wind-driven coastal currents during large storms and hurricanes. Deposition appears to be related to changes in shoreline orientation, closing of transport pathways into a large bay to the east and the presence of tidal inlets. This newly documented type of bypassing, an offshore bypassing of the inlet system, naturally nourished the immediate downdrift area, the eastern Isles Dernieres, where shoreface and shoreline erosion rates are about half of pre-bypassing rates. Erosion rates remained the same farther downdrift, where bypassing has not yet reached. As this offshore bypassing continues, the destruction of the Isles Dernieres will be slowed.

  12. Lower Miocene sequence stratigraphy of Taishi Basin, offshore Western Taiwan

    SciTech Connect

    Ting, J.S. (Chinese Petroleum Corp., Taipei (Taiwan, Province of China)); Lee, T.Y. (National Taiwan Normal Univ., Taipei (Taiwan, Province of China))

    1994-07-01

    By applying sequence stratigraphic concepts to the lower Miocene sedimentary sections in Taishi Basin, offshore western Taiwan, it is possible to identify four third-order sequences from subsurface information. The overall depositional environment of these sequences is in a deltaic setting. Following the early Aquitanian flood (24.8 Ma), the basin experienced a long period of sea level highstand, which generated more than 400 m of highstand prograding units. In late Aquitanian time, a thick retrogradational package ([approximately]250 m) was developed in response to rising sea level. Sandy units are now the dominant sediment type in the Taishi Basin. Until the early middle Miocene (15-16 Ma), the basin was flooded and deposited with thick marine shale. This analysis shows that the lower Miocene sedimentary sequences in the Taishi Basin have a good correlation with the Haq et al. (1987) chart, which would imply a passive margin setting for the Taishi Basin in the early Miocene. The predictive nature of the sequence stratigraphic technique can help in redefining the hydrocarbon play concepts in this area.

  13. Canadian offshore oil production solution gas utilization alternatives

    SciTech Connect

    Wagner, J.V.

    1999-07-01

    Oil and gas development in the Province of Newfoundland and Labrador is in its early stage and the offshore industry emphasis is almost exclusively on oil production. At the Hibernia field, the Gravity Base Structure (GBS) is installed and the first wells are in production. The Terra Nova project, based on a Floating Production Storage Offloading (FPSO) ship shaped concept, is in its engineering and construction stage and first oil is expected by late 2000. Several other projects, such as Husky's White Rose and Chevron's Hebron, have significant potential for future development in the same area. It is highly probably that these projects will employ the FPSO concept. It is also expected that the solution gas disposal issues of such second generation projects will be of more significance in their regulatory approval process and of such second generation projects will be of more significance in their regulatory approval process and the operators may be forced to look for alternatives to gas reinjection. Three gas utilization alternatives for a FPSO concept based project have been considered and evaluated in this paper: liquefied natural gas (LNG), compressed natural gas (CNG), and gas-to-liquids conversion (GTL). The evaluation and the relative ranking of these alternatives is based on a first pass screening type of study which considers the technical and economical merits of each alternative. Publicly available information and in-house data, compiled within Fluor Daniel's various offices, was used to establish the basic parameters.

  14. Understanding Potential Climate Variability Impacts on the Offshore Energy Industry

    NASA Astrophysics Data System (ADS)

    Stear, J.

    2014-12-01

    Climate variability may have important implications for the offshore energy industry. Scenarios of increased storm activity and changes in sea level could require the retrofit of existing offshore platforms and coastal infrastructure, the decommissioning of facilities for which upgrade or relocation is not economically viable, and the development of new methods and equipment which are removed from or less sensitive to environmental loads. Over the past years the energy industry has been actively involved in collaborative research efforts with government and academia to identify the potential changes in the offshore operating environment, and corresponding risk implications. This presentation will review several of these efforts, and for several of the hypothetical climate variation scenarios, review the potential impacts on and possible mitigations for offshore and coastal energy infrastructure and operations.

  15. 49 CFR 195.57 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Filing offshore pipeline condition reports. 195.57 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF...

  16. 49 CFR 195.57 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Filing offshore pipeline condition reports. 195.57 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF...

  17. 49 CFR 195.57 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Filing offshore pipeline condition reports. 195.57 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF...

  18. 49 CFR 191.27 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Filing offshore pipeline condition reports. 191.27 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF NATURAL...

  19. 49 CFR 195.57 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Filing offshore pipeline condition reports. 195.57 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF...

  20. 49 CFR 191.27 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2011 CFR

    2011-10-01

    ...2011-10-01 false Filing offshore pipeline condition reports. 191.27 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF NATURAL...

  1. 49 CFR 191.27 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Filing offshore pipeline condition reports. 191.27 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF NATURAL...

  2. 49 CFR 191.27 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...2010-10-01 false Filing offshore pipeline condition reports. 191.27 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF NATURAL...

  3. OUTSHORE Maturity Model: Assistance for Software Offshore Outsourcing Decisions

    NASA Astrophysics Data System (ADS)

    Mäkiö, Juho; Betz, Stafanie; Oberweis, Andreas

    Offshore outsourcing software development (OOSD) is increasingly being used by the Software Industry. OOSD is a specific variant of Geographically Distributed Software Developmentdistributed software development (GDSD). Compared to the traditional mode of software development (i.e., in-house) GDSD is more edgy and puts at risk the attainment of the expected results. Although the failure of an offshore outsourcing software project may be caused by a variety of factors, one major complication is geographical distance. Consequently we argue that risk avoidance in outshore software development should be undertaken well in advance of the development launch. This could be done by testing the offshore outsourcing relevance of each software project and then the offshore outsourcing company involved. With this in mind we have developed the OUTSHORE Maturity Modeloutshore maturity model - OMM.

  4. Multi-hazard Reliability Assessment of Offshore Wind Turbines 

    E-print Network

    Mardfekri Rastehkenari, Maryam 1981-

    2012-12-04

    A probabilistic framework is developed to assess the structural reliability of offshore wind turbines. Probabilistic models are developed to predict the deformation, shear force and bending moment demands on the support structure of wind turbines...

  5. Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine 

    E-print Network

    Bae, Yoon Hyeok

    2013-04-23

    In the present study, a numerical simulation tool has been developed for the rotor-floater-tether coupled dynamic analysis of Multiple Unit Floating Offshore Wind Turbine (MUFOWT) in the time domain including aero-blade-tower dynamics and control...

  6. 12. OFFSHORE VIEW OF PIER, LOOKING EAST, SHOWING LIFEGUARD TOWER ...

    Library of Congress Historic Buildings Survey, Historic Engineering Record, Historic Landscapes Survey

    12. OFFSHORE VIEW OF PIER, LOOKING EAST, SHOWING LIFEGUARD TOWER AND 2ND TEE (CENTER), REFUGE BAY (RIGHT) - Huntington Beach Municipal Pier, Pacific Coast Highway at Main Street, Huntington Beach, Orange County, CA

  7. Development of a composite repair system for reinforcing offshore risers 

    E-print Network

    Alexander, Christopher Richard

    2009-05-15

    A research program was conducted to investigate the application of composite materials in repairing corroded offshore risers, leading to the development of an optimized repair using a hybrid carbon/E-glass system. The objective of this research...

  8. Use of a mobile diving support vessel, Offshore California

    SciTech Connect

    Carroll, J.P.

    1983-03-01

    The Blue Dolphin is a converted workboat with a one-atmosphere manipulator bell diving system. It provides diving support for Chevron's offshore drilling program. This support includes underwater inspection, repair and salvage.

  9. 46 CFR 131.320 - Safety orientation for offshore workers.

    Code of Federal Regulations, 2010 CFR

    2010-10-01

    ...are made informing each offshore worker of— (1) In general terms, emergency and evacuation procedures; (2) Locations of emergency exits and of embarkation areas for survival craft; (3) Locations of stowage of lifejackets and...

  10. 49 CFR 195.57 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Filing offshore pipeline condition reports. 195.57 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF...

  11. 49 CFR 191.27 - Filing offshore pipeline condition reports.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Filing offshore pipeline condition reports. 191.27 Section...Relating to Transportation (Continued) PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION...DEPARTMENT OF TRANSPORTATION (CONTINUED) PIPELINE SAFETY TRANSPORTATION OF NATURAL...

  12. A wind chart to characterize potential offshore wind energy sites

    NASA Astrophysics Data System (ADS)

    del Jesus, F.; Menéndez, M.; Guanche, R.; Losada, I. J.

    2014-10-01

    Offshore wind industry needs to improve wind assessment in order to decrease the uncertainty associated to wind resource and its influence on financial requirements. Here, several features related to offshore wind resource assessment are discussed, such as input wind data, estimation of long-term and extreme wind statistics, the wind profile and climate variations. This work proposes an analytical method to characterize wind resource. Final product is a wind chart containing useful wind information that can be applied to any offshore sites. Using long-term time series of meteorological variables (e.g. wind speed and direction at different heights), the methodology is applied to five pilot sites in different countries along European Atlantic corridor and it is used to describe and compare offshore wind behavior.

  13. Multi-hazard Reliability Assessment of Offshore Wind Turbines

    E-print Network

    Mardfekri Rastehkenari, Maryam 1981-

    2012-12-04

    A probabilistic framework is developed to assess the structural reliability of offshore wind turbines. Probabilistic models are developed to predict the deformation, shear force and bending moment demands on the support structure of wind turbines...

  14. Climbing ring robot for inspection of offshore wind turbines

    Microsoft Academic Search

    Tariq P. Sattar; Hernando Leon Rodriguez; Bryan Bridge

    2009-01-01

    Purpose – Structural integrity inspection of offshore wind turbine blades poses problems of gaining access to the blades, danger to human operatives and large costs of removing a blade and transporting it off-shore for inspection. The purpose of this paper is to show that a climbing robot that can perform in situ blade inspection with micro\\/nano focus computed axial X-ray

  15. A control strategy for series connected offshore wind turbines

    Microsoft Academic Search

    Alejandro Garces; Marta Molinas

    2011-01-01

    This paper presents a control strategy for HVDC systems based on pulse width modulated current source converters. The strategy is applicable to series connected off-shore wind farms where the line current must be controlled by the on-land converter while the off-shore voltage and power are controlled by converters allocated in each turbine. A threestage hierarchical control based on proportional regulators

  16. Coupled dynamic analysis of floating offshore wind farms

    E-print Network

    Shim, Sangyun

    2009-05-15

    .2.3 FAST............................................................................................................. 11 2.3 The concept of coupled model of floating offshore wind turbine....................... 14 2.3.1 Introduction... turbines under the aerodynamic load () r aero F . More information about FAST can be found in the FAST User?s Guide (Jonkman, Jason, and Buhl, 2004). 14 2.3 The concept of coupled model of floating offshore wind turbine 2.3.1 Introduction...

  17. International Journal of Offshore and Polar Engineering (ISSN 1053-5381) Copyright by The International Society of Offshore and Polar Engineers

    E-print Network

    Manuel, Lance

    loads in many applications, including offshore platforms (Winterstein et al., 1993) and onshore windInternational Journal of Offshore and Polar Engineering (ISSN 1053-5381) Copyright © by The International Society of Offshore and Polar Engineers Vol. 15, No. 2, June 2005, pp. 1­9 On Assessing

  18. Evaluation of the vapor-protection capabilities of the jacket/trouser interface on the regulation ground-crew chemical defense ensemble. Interim report, 15 Nov-15 Dec 88

    SciTech Connect

    Scott, W.R.; Pointer, B.W.

    1990-12-01

    The ground-crew chemical defense ensemble (CDE) has deficiencies in its ability to prevent chemical warfare (CW) simulant vapors from leaking past the outer charcoal layer in the abdominal region when personnel wearing this CDE perform exercise in a simulant CW agent vapor. The purpose of this study was to determine the site and amount of vapor penetration. A charcoal-fabric cummerbund was used as an experimental tool to prevent vapor from leaking through the jacket/trouser interface. Test subjects, wearing the ground-crew CDE with and without cummerbund, performed exercises in a CW simulant vapor (methyl salicylate). While subjects were exposed to the simulant vapor, vapor concentrations were measured under the CDE jacket in the abdominal region. After removing the CDE in a vapor-free area, subjects entered sealed offgassing booths where simulant vapor levels were continuously measured. Subjects wearing a cummerbund had 80% lower abdominal vapor concentrations and 33% lower maximum offgassing booth concentrations than subjects that did not wear a cummerbund. The source of the vapor penetration is along the jacket/ trouser interface of the ground crew CDE.

  19. U.S. Offshore Wind Manufacturing and Supply Chain Development

    SciTech Connect

    Hamilton, Bruce Duncan [Navigant Consulting, Inc.

    2013-02-22

    The objective of the report is to provide an assessment of the domestic supply chain and manufacturing infrastructure supporting the U.S. offshore wind market. The report provides baseline information and develops a strategy for future development of the supply chain required to support projected offshore wind deployment levels. A brief description of each of the key chapters includes: » Chapter 1: Offshore Wind Plant Costs and Anticipated Technology Advancements. Determines the cost breakdown of offshore wind plants and identifies technical trends and anticipated advancements in offshore wind manufacturing and construction. » Chapter 2: Potential Supply Chain Requirements and Opportunities. Provides an organized, analytical approach to identifying and bounding the uncertainties associated with a future U.S. offshore wind market. It projects potential component-level supply chain needs under three demand scenarios and identifies key supply chain challenges and opportunities facing the future U.S. market as well as current suppliers of the nation’s land-based wind market. » Chapter 3: Strategy for Future Development. Evaluates the gap or competitive advantage of adding manufacturing capacity in the U.S. vs. overseas, and evaluates examples of policies that have been successful . » Chapter 4: Pathways for Market Entry. Identifies technical and business pathways for market entry by potential suppliers of large-scale offshore turbine components and technical services. The report is intended for use by the following industry stakeholder groups: (a) Industry participants who seek baseline cost and supplier information for key component segments and the overall U.S. offshore wind market (Chapters 1 and 2). The component-level requirements and opportunities presented in Section 2.3 will be particularly useful in identifying market sizes, competition, and risks for the various component segments. (b) Federal, state, and local policymakers and economic development agencies, to assist in identifying policies with low effort and high impact (Chapter 3). Section 3.3 provides specific policy examples that have been demonstrated to be effective in removing barriers to development. (c) Current and potential domestic suppliers in the offshore wind market, in evaluating areas of opportunity and understanding requirements for participation (Chapter 4). Section 4.4 provides a step-by-step description of the qualification process that suppliers looking to sell components into a future U.S. offshore wind market will need to follow.

  20. \\\\server05\\productn\\C\\CJP\\14-1\\CJP102.txt unknown Seq: 1 24-FEB-05 17:48 REGULATING OFFSHORE WIND POWER AND

    E-print Network

    Firestone, Jeremy

    . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 R A. OFFSHORE AQUACULTURE (MARICULTURE) . . . . . . . . . . . 74 R B. OFFSHORE WIND POWER PRODUCTION . . . . . . . . . . . . . . . 75 R C. POTENTIAL CONNECTIONS AMONG OFFSHORE WIND POWER, MARINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96 R A. OFFSHORE WIND POWER IN EUROPE . . . . . . . . . . . . . . . . . 96 R B. BEST PRACTICES

  1. Coupled Dynamic Analysis of Large-Scale Mono-Column Offshore Wind Turbine with a Single Tether Hinged in Seabed 

    E-print Network

    Chen, Jieyan

    2012-10-19

    The increased interest in the offshore wind resource in both industry and academic and the extension of the wind field where offshore wind turbine can be deployed has stimulated quite a number of offshore wind turbines concepts. This thesis presents...

  2. 76 FR 22130 - Commercial Leasing for Wind Power on the Outer Continental Shelf Offshore New Jersey-Call for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2011-04-20

    ...on the Outer Continental Shelf Offshore New Jersey--Call for Information and Nominations...on the Outer Continental Shelf Offshore New Jersey...Outer Continental Shelf (OCS) offshore New Jersey. Although this announcement is...

  3. 46 CFR 127.280 - Construction and arrangement of quarters for crew members and accommodations for offshore workers.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...accommodations for offshore workers. 127.280 Section...OFFSHORE SUPPLY VESSELS CONSTRUCTION AND ARRANGEMENTS Particular Construction and Arrangements § 127.280 Construction and arrangement of quarters... (1) Each offshore worker aboard must be...

  4. 46 CFR 127.280 - Construction and arrangement of quarters for crew members and accommodations for offshore workers.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...accommodations for offshore workers. 127.280 Section...OFFSHORE SUPPLY VESSELS CONSTRUCTION AND ARRANGEMENTS Particular Construction and Arrangements § 127.280 Construction and arrangement of quarters... (1) Each offshore worker aboard must be...

  5. 46 CFR 127.280 - Construction and arrangement of quarters for crew members and accommodations for offshore workers.

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...accommodations for offshore workers. 127.280 Section...OFFSHORE SUPPLY VESSELS CONSTRUCTION AND ARRANGEMENTS Particular Construction and Arrangements § 127.280 Construction and arrangement of quarters... (1) Each offshore worker aboard must be...

  6. 33 CFR 165.155 - Northville Industries Offshore Platform, Riverhead, Long Island, New York-safety zone.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...false Northville Industries Offshore Platform, Riverhead, Long Island...155 Northville Industries Offshore Platform, Riverhead, Long Island, New...of the Northville Industries Offshore Platform, Long Island, New York, 1...

  7. 33 CFR 165.155 - Northville Industries Offshore Platform, Riverhead, Long Island, New York-safety zone.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...false Northville Industries Offshore Platform, Riverhead, Long Island...155 Northville Industries Offshore Platform, Riverhead, Long Island, New...of the Northville Industries Offshore Platform, Long Island, New York, 1...

  8. Offshore maintenance reduces cost and downtime

    SciTech Connect

    Danahy, J.W.

    1983-08-01

    Maintenance is the single activity offshore that can have the most impact on productivity, safety, and downtime. Unfortunately, unless it is well organized, maintenance may be carried out according to unchanging and often unnecessary routines. Overly rigid maintenance procedures, that are viewed by crews as ''makework'' assignments, are not conducive to quality or to failure-proof operation of key rig systems. An alternate system of maintenance, which Keydril has adopted on all its rigs, is designed to circumvent the problems of crew attitude and at the same time provide an effective preventive program that simply and efficiently manages all of the rig's operational requirements. The program consists of detailed maintenance and test procedures which are based on frequency analyses of the operating profiles of each piece of machinery. Keydril calls the program an Engineered Approach to Maintenance. The heart of the engineered approach system is a color-coded visual display of maintenance requirement cards (T-cards). These cards assign and describe specific tasks according to an analysis of the operating history of the unit itself and analyses of similar equipment on other company rigs. The second part of the engineered system is the use of high-technology testing methods that can remotely analyze various operating parameters and give early warning of equipment wear prior to failure. The equipment on board Keydril's rigs must be used, and rig personnel have to know that it will always work at satisfactory performance levels. The engineered approach to maintenance provides that assurance.

  9. Tuned vibration absorbers for offshore structures

    SciTech Connect

    Dimentberg, M.F.; Hou, Z.; Noori, M.N.; Chen, S. [Worcester Polytechnic Inst., MA (United States). Dept. of Mechanical Engineering

    1996-12-31

    A preliminary feasibility study is made of efficiency of tuned vibration absorbers for reducing response of offshore platforms, to random ocean waves. The absorbers are submerged spring-loaded flaps, with stiffnesses of the springs being adjusted for tuning to any specific (rigid-body) mode of the platform (heaving, pitching, etc.), whereas actual design of the flaps should provide the desired amount of drag-induced damping. Mean square response analysis of the system is made for the case of a narrow-band random excitation due to ocean waves by using method of moments in conjunction with statistical linearization (with Gaussian closure) for quadratic damping term. Extensive parametric study is made of the efficiency of vibration control through the use of absorbers, as represented by the RMS response reduction factor. In particular, the efficiency increases with the absorber/platform mass ratio, and it may be of some practical importance even at values of this ratio as small as one percent. The importance of the excitation bandwidth is demonstrated. It is shown also, that whereas optimal damping of the absorber depends on the level of wave excitation, the RMS response reduction is fairly constant within a rather broad range of (nonlinear) damping, so that adjusting absorber damping for storm level may not be necessary.

  10. AORIS. Arctic & Offshore Technical Data System

    SciTech Connect

    Pastoria, G.A. [USDOE, Morgantown Energy Tech. Ctr., WV (United States)

    1990-05-01

    AORIS is a computerized information system to assist the technology and planning community in the development of Arctic oil and gas resources. In general, AORIS is geographically dependent and, where possible, site specific. The main topics are sea ice, geotechnology, oceanography, meteorology, and Arctic engineering, as they relate to such offshore oil and gas activities as exploration, production, storage, and transportation. AORIS consists of a directory component that identifies 85 Arctic energy-related databases and tells how to access them; a bibliographic/management information system or bibliographic component containing over 8,000 references and abstracts on Arctic energy-related research; and a scientific and engineering information system, or data component, containing over 800 data sets, in both tabular and graphical formats, on sea ice characteristics taken from the bibliographic citations. AORIS also contains much of the so-called grey literature, i.e., data and/or locations of Arctic data collected, but never published. The three components are linked so the user may easily move from one component to another. A generic information system is provided to allow users to create their own information systems. The generic programs have the same query and updating features as AORIS, except that there is no directory component.

  11. Vega is first offshore development for Montedison

    SciTech Connect

    Not Available

    1985-10-01

    Montedison's Vega field, 15 miles off the southern tip of Sicily, has recoverable oil reserves of 400 million bbl. This is Montedison's first offshore development venture, although the operator has considerable onshore experience. It will be followed by a second field, the smaller Mila floating production system, also off Sicily. One platform will be placed on a template installed in 1983 with up to 18 pre-drilled wells in water depths of 480 ft. The field may hold up to 1 billion bbl of 16/sup 0/ crude, but geology is complex and heavily fractured. The template has 30 available drilling slots, and water injection is being considered. The Vega discovery well was drilled in 1980, with 5000 b/d tested from 1000-ft oil column in Strep-penosa shales. Subsequently five wells were drilled by the Glomar Biscay I semi. These wells were drilled to a depth of just over 8000 ft with a total deviation of 60/sup 0/. The template is the first in the Mediterranean.

  12. Method for supporting offshore well caisson

    SciTech Connect

    Tawfik, A.S.; Urquhart, R.G.

    1991-08-27

    This patent describes a method for supporting an offshore well caisson or drivepipe extending generally vertically from a seabed to a point thereabove. It comprises providing a support member comprising generally vertically oriented tubular sleeve means adapted to be sleeved around the caisson in supporting relationship thereto, the sleeve means being a continuous vertically- extending sleeve or vertically spaced-apart sleeves aligned one with the other, lateral brace means extending from the sleeve means to plural spaced-apart pile guide sleeves, and diagonally-extending brace means extending generally upwardly and downwardly, respectively, between an intermediate point on the sleeve means and the spaced-apart pile guide sleeves to form a unitary support for the caisson and for receiving generally vertically-extending anchor piles for anchoring the support member to the seabed; positioning the support member on the seabed in a predetermined location; driving respective piles through respective sets of vertically spaced-apart pile guide sleeves to a predetermined depth; and inserting the caisson through the sleeve means and conducting well operation through the caissons.

  13. Sensitivity Analysis of Offshore Wind Cost of Energy (Poster)

    SciTech Connect

    Dykes, K.; Ning, A.; Graf, P.; Scott, G.; Damiami, R.; Hand, M.; Meadows, R.; Musial, W.; Moriarty, P.; Veers, P.

    2012-10-01

    No matter the source, offshore wind energy plant cost estimates are significantly higher than for land-based projects. For instance, a National Renewable Energy Laboratory (NREL) review on the 2010 cost of wind energy found baseline cost estimates for onshore wind energy systems to be 71 dollars per megawatt-hour ($/MWh), versus 225 $/MWh for offshore systems. There are many ways that innovation can be used to reduce the high costs of offshore wind energy. However, the use of such innovation impacts the cost of energy because of the highly coupled nature of the system. For example, the deployment of multimegawatt turbines can reduce the number of turbines, thereby reducing the operation and maintenance (O&M) costs associated with vessel acquisition and use. On the other hand, larger turbines may require more specialized vessels and infrastructure to perform the same operations, which could result in higher costs. To better understand the full impact of a design decision on offshore wind energy system performance and cost, a system analysis approach is needed. In 2011-2012, NREL began development of a wind energy systems engineering software tool to support offshore wind energy system analysis. The tool combines engineering and cost models to represent an entire offshore wind energy plant and to perform system cost sensitivity analysis and optimization. Initial results were collected by applying the tool to conduct a sensitivity analysis on a baseline offshore wind energy system using 5-MW and 6-MW NREL reference turbines. Results included information on rotor diameter, hub height, power rating, and maximum allowable tip speeds.

  14. Comparing offshore wind farm wake observed from satellite SAR and wake model results

    NASA Astrophysics Data System (ADS)

    Bay Hasager, Charlotte

    2014-05-01

    Offshore winds can be observed from satellite synthetic aperture radar (SAR). In the FP7 EERA DTOC project, the European Energy Research Alliance project on Design Tools for Offshore Wind Farm Clusters, there is focus on mid- to far-field wind farm wakes. The more wind farms are constructed nearby other wind farms, the more is the potential loss in annual energy production in all neighboring wind farms due to wind farm cluster effects. It is of course dependent upon the prevailing wind directions and wind speed levels, the distance between the wind farms, the wind turbine sizes and spacing. Some knowledge is available within wind farm arrays and in the near-field from various investigations. There are 58 offshore wind farms in the Northern European seas grid connected and in operation. Several of those are spaced near each other. There are several twin wind farms in operation including Nysted-1 and Rødsand-2 in the Baltic Sea, and Horns Rev 1 and Horns Rev 2, Egmond aan Zee and Prinses Amalia, and Thompton 1 and Thompton 2 all in the North Sea. There are ambitious plans of constructing numerous wind farms - great clusters of offshore wind farms. Current investigation of offshore wind farms includes mapping from high-resolution satellite SAR of several of the offshore wind farms in operation in the North Sea. Around 20 images with wind farm wake cases have been retrieved and processed. The data are from the Canadian RADARSAT-1/-2 satellites. These observe in microwave C-band and have been used for ocean surface wind retrieval during several years. The satellite wind maps are valid at 10 m above sea level. The wakes are identified in the raw images as darker areas downwind of the wind farms. In the SAR-based wind maps the wake deficit is found as areas of lower winds downwind of the wind farms compared to parallel undisturbed flow in the flow direction. The wind direction is clearly visible from lee effects and wind streaks in the images. The wind farm wake cases are modeled by various types of wake models. In the EERA DTOC project the model suite consists of engineering models (Ainslie, DWM, GLC, PARK, WASP/NOJ), simplified CFD models (FUGA, FarmFlow), full CFD models (CRES-flowNS, RANS), mesoscale model (SKIRON, WRF) and coupled meso-scale and microscale models. The comparison analysis between the satellite wind wake and model results will be presented and discussed. It is first time a comprehensive analysis is performed on this subject. The topic gains increasing importance because there is a growing need to precisely model also mid- and far-field wind farms wakes for development and planning of offshore wind farm clusters.

  15. 'Copenhagen Offshore Wind 2005' Topic: Wind turbine technology - for offshore application. Wind resources and wake effects Short-term forecasting of wind speeds in the offshore environment

    Microsoft Academic Search

    Rebecca Barthelmie; Gregor Giebel; Jake Badger

    Summary This paper focuses on a number of special issues that arise in terms of forecasting power output from large offshore wind farms. The effects considered are: wind speed gradients in the coastal zone and vertical wind speed profile extrapolation to hub-height. Wake effects are important but not considered here. Typically wind speed predictions for a specific location from a

  16. The application of PLC distributed input/output technology offshore

    SciTech Connect

    Glendening, J.A.

    1995-12-01

    The Programmable Logic Controller is becoming a familiar part of the Process Controls on Offshore Facilities. The current evolution of this expanding technology is Distributed I/O Blocks, and this paper is concerned with the benefits and applications this new technology brings to the Offshore Industry. The advent of the Programmable Logic Controller to the Gulf of Mexico brought greater process control flexibility to Offshore facilities. The offshore control philosophy went from independent pneumatic control of each skid unit to PLC distributed control with field panels that contained the local controls for several skid units and interfaced with control room based PLC visual display stations. The Distributed I/O Block concept allows offshore control systems to eliminate the large field interface panel, along with the associated wiring and hardware cost. This is accomplished by installing Distributed 1/0 Blocks inside the individual skid control panels and then communicating back to the control room based PLC via redundant communication cables. The control wiring between each skid control panel and the control room is now reduced to one power cable and redundant communication cables.

  17. Shift work at a modern offshore drilling rig.

    PubMed

    Rodrigues, V F; Fischer, F M; Brito, M J

    2001-12-01

    The oil and gas exploration and production offshore units are classified as hazardous installations. Work in these facilities is complex, confined and associated with a wide range of risks. The continuous operation is secured by various shift work patterns. The objective of this study was to evaluate how offshore drilling workers perceived shift work at high seas and its impacts on their life and working conditions. The main features of the studied offshore shift work schedules are: long time on board (14 to 28 days), extended shifts (12 hours or more per day), slow rotation (7 to 14 days in the same shift), long sequence of days on the night shift (7 to 14 days in a row) and the extra-long extended journey (18 hours) on shift change and landing days. Interviews revealed a wide range of stressors caused by the offshore shift work, as well as difficulties to conciliate work with family life. It was observed that changes of the family model, leading to role conflicts and social isolation, work in a hazardous environment, perceiving poor sleep when working at night shifts and the imbalance between the expected and actual rewards are the major stressors for the offshore drilling workers. PMID:14564877

  18. Quantifying the hurricane risk to offshore wind turbines

    PubMed Central

    Rose, Stephen; Jaramillo, Paulina; Small, Mitchell J.; Grossmann, Iris; Apt, Jay

    2012-01-01

    The U.S. Department of Energy has estimated that if the United States is to generate 20% of its electricity from wind, over 50 GW will be required from shallow offshore turbines. Hurricanes are a potential risk to these turbines. Turbine tower buckling has been observed in typhoons, but no offshore wind turbines have yet been built in the United States. We present a probabilistic model to estimate the number of turbines that would be destroyed by hurricanes in an offshore wind farm. We apply this model to estimate the risk to offshore wind farms in four representative locations in the Atlantic and Gulf Coastal waters of the United States. In the most vulnerable areas now being actively considered by developers, nearly half the turbines in a farm are likely to be destroyed in a 20-y period. Reasonable mitigation measures—increasing the design reference wind load, ensuring that the nacelle can be turned into rapidly changing winds, and building most wind plants in the areas with lower risk—can greatly enhance the probability that offshore wind can help to meet the United States’ electricity needs. PMID:22331894

  19. 31 CFR 560.417 - Facilitation; change of policies and procedures; referral of business opportunities offshore.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...procedures; referral of business opportunities offshore. 560.417...procedures; referral of business opportunities offshore. With respect...requests for bids, or similar business opportunities involving Iran or the...

  20. Large-Scale Offshore Wind Power in the United States: Executive Summary

    Microsoft Academic Search

    W. Musial; B. Ram

    2010-01-01

    This document provides a summary of a 236-page NREL report that provides a broad understanding of today's offshore wind industry, the offshore wind resource, and the associated technology challenges, economics, permitting procedures, and potential risks and benefits.

  1. 33 CFR 165.1156 - Safety Zone; Offshore Marine Terminal, El Segundo, CA.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... false Safety Zone; Offshore Marine Terminal, El Segundo, CA. 165.1156 Section 165.1156 Navigation and Navigable...1156 Safety Zone; Offshore Marine Terminal, El Segundo, CA. (a) Location. The following area is a safety zone: All waters of...

  2. Proceedings of the seventh international conference on offshore mechanics and Arctic engineering

    Microsoft Academic Search

    J. S. Chung; C. P. Sparks; J. N. Brekke; E. C. Clukey; T. R. Penney

    1988-01-01

    These proceedings collect papers given at a conference on offshore engineering. Topics include: fracture mechanics, vibration testing, wave energy converters, ocean thermal energy converters, underwater pipelines, offshore platforms, and design and installation of permanent mooring systems for tankers.

  3. 46 CFR 11.540 - Endorsements as engineers of mobile offshore drilling units (MODUs).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ...2014-10-01 false Endorsements as engineers of mobile offshore drilling units (MODUs). 11.540 Section 11.540 Shipping... § 11.540 Endorsements as engineers of mobile offshore drilling units (MODUs). Endorsements as chief engineer...

  4. 46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.

    Code of Federal Regulations, 2012 CFR

    2012-10-01

    ...2012-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping COAST GUARD... § 11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer (MODU) or...

  5. 46 CFR 11.468 - National officer endorsements for mobile offshore drilling units (MODUs).

    Code of Federal Regulations, 2014 CFR

    2014-10-01

    ... false National officer endorsements for mobile offshore drilling units (MODUs). 11.468 Section 11.468 Shipping...11.468 National officer endorsements for mobile offshore drilling units (MODUs). Officer endorsements for service on...

  6. 46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.

    Code of Federal Regulations, 2013 CFR

    2013-10-01

    ...2013-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping COAST GUARD... § 11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer (MODU) or...

  7. 40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false Spill Prevention, Control...requirements for offshore oil drilling, production...Vegetable Oils (Including Oils from Seeds, Nuts, Fruits...Kernels) § 112.11 Spill Prevention, Control...requirements for offshore oil drilling,...

  8. 75 FR 21648 - MMS Information Collection Activity: 1010-0106, Oil Spill Financial Responsibility for Offshore...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-04-26

    ...Collection Activity: 1010-0106, Oil Spill Financial Responsibility for Offshore...regulations under ``30 CFR Part 253, Oil Spill Financial Responsibility for Offshore...INFORMATION: Title: 30 CFR Part 253, Oil Spill Financial Responsibility for...

  9. 78 FR 66763 - Information Collection: Oil Spill Financial Responsibility for Offshore Facilities; Submitted for...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-11-06

    ...MMAA104000] Information Collection: Oil Spill Financial Responsibility for Offshore...paperwork requirements for 30 CFR 553, Oil Spill Financial Responsibility for Offshore...1010-0106. Title: 30 CFR 553, Oil Spill Financial Responsibility for...

  10. 75 FR 37783 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-06-30

    ...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling (the Commission...Deepwater Horizon explosion, fire and oil spill and develop options to guard...

  11. 75 FR 39518 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling; Correction

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-07-09

    ...ENERGY National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling; Correction AGENCY: Office of...of the National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling, (75 FR 37783). This...

  12. 40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2013-07-01 true Spill Prevention, Control...requirements for offshore oil drilling, production...Vegetable Oils (Including Oils from Seeds, Nuts, Fruits...Kernels) § 112.11 Spill Prevention, Control...requirements for offshore oil drilling,...

  13. 78 FR 25472 - Information Collection: Oil Spill Financial Responsibility for Offshore Facilities; Proposed...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-01

    ...1010-0106] Information Collection: Oil Spill Financial Responsibility for Offshore...paperwork requirements for 30 CFR 553, Oil Spill Financial Responsibility for Offshore...1010-0106. Title: 30 CFR Part 553, Oil Spill Financial Responsibility for...

  14. 78 FR 47723 - Information Collection: Forms for Oil Spill Financial Responsibility for Offshore Facilities...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-08-06

    ...Information Collection: Forms for Oil Spill Financial Responsibility for Offshore...paperwork requirements under 30 CFR 553, Oil Spill Financial Responsibility for Offshore...1010-0106. Title: 30 CFR 553, Oil Spill Financial Responsibility for...

  15. 40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false Spill Prevention, Control...requirements for offshore oil drilling, production...Vegetable Oils (Including Oils from Seeds, Nuts, Fruits...Kernels) § 112.11 Spill Prevention, Control...requirements for offshore oil drilling,...

  16. 40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false Spill Prevention, Control...requirements for offshore oil drilling, production...Vegetable Oils (Including Oils from Seeds, Nuts, Fruits...Kernels) § 112.11 Spill Prevention, Control...requirements for offshore oil drilling,...

  17. 40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false Spill Prevention, Control...requirements for offshore oil drilling, production...Vegetable Oils (Including Oils from Seeds, Nuts, Fruits...Kernels) § 112.11 Spill Prevention, Control...requirements for offshore oil drilling,...

  18. 75 FR 13644 - TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas Deepwater Port License...

    Federal Register 2010, 2011, 2012, 2013, 2014

    2010-03-22

    ...Administration [USCG-2006-24644] TORP Terminal LP, Bienville Offshore Energy Terminal Liquefied Natural Gas Deepwater Port License...Environmental Impact Statement (FSEIS) for the TORP Terminal LP, Bienville Offshore Energy Terminal...

  19. VALUING PUBLIC PREFERENCES FOR OFFSHORE WIND POWER: A CHOICE EXPERIMENT APPROACH

    E-print Network

    Firestone, Jeremy

    VALUING PUBLIC PREFERENCES FOR OFFSHORE WIND POWER: A CHOICE EXPERIMENT APPROACH by Andrew D. Krueger All Rights Reserved #12;ii VALUING PUBLIC PREFERENCES FOR OFFSHORE WIND POWER: A CHOICE EXPERIMENT

  20. Federal offshore statistics: 1992. Leasing, exploration, production, and revenues as of December 31, 1992

    SciTech Connect

    Francois, D.K.

    1993-12-31

    The Outer Continental Shelf Lands Act, enacted in 1953 and amended several times, charges the Secretary of the Interior with the responsibility for administering and managing mineral exploration and development of the outer continental shelf, as well as for conserving its natural resources. This report documents the following: Federal offshore lands; offshore leasing activity and status; offshore development activity; offshore production of crude oil and natural gas; Federal offshore oil and natural gas sales volume and royalties; revenue from Federal offshore leases; disbursement of Federal offshore revenue; reserves and resource estimates of offshore oil and natural gas; oil pollution in US and international waters; and international activities and marine minerals. 11 figs., 83 tabs.

  1. Large-Scale Offshore Wind Power in the United States: Executive Summary

    SciTech Connect

    Musial, W.; Ram, B.

    2010-09-01

    This document provides a summary of a 236-page NREL report that provides a broad understanding of today's offshore wind industry, the offshore wind resource, and the associated technology challenges, economics, permitting procedures, and potential risks and benefits.

  2. Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam

    SciTech Connect

    McMillen, K.J. [Beaver Creek Tech. Co., Mason, TX (United States); Do Van Luu; Lee, E.K.; Hong, S.S. [PEDCO, Ho Chi Minh City (Viet Nam)

    1996-12-31

    An integrated well log, biostratigraphic, and seismic stratigraphic study of Miocene to Recent deltaic sediments deposited in the Nam Con Son Basin offshore from southern Vietnam shows the influence of eustacy and tectonics on sequence development. Sediments consist of Oligocene non-marine rift-basin fill (Cau Formation), early to middle Miocene tide-dominated delta plain to delta front sediments (TB 1.5 to TB 2.5, Due and Thong Formations), and late Miocene to Recent marine shelf sediments (TB. 2.6 to TB 3.1 0, Mang Cau, Nam Con Son, and Bien Dong Formations). Eustacy controlled the timing of key surfaces and sand distribution in the tectonically-quiet early Miocene. Tectonic effects on middle to late Miocene sequence development consist of thick transgressive systems tracts due to basin-wide subsidence and transgression, sand distribution in the basin center, and carbonate sedimentation on isolated fault blocks within the basin. Third-order sequence boundaries (SB) are identified by spore peaks, sand stacking patterns, and channel incision. In the basin center, widespread shale beds with coal occur above sequence boundaries followed by transgressive sandstone units. These TST sandstones merge toward the basin margin where they lie on older HST sandstones. Maximum flooding surfaces (MFS) have abundant marine microfossils and mangrove pollen, a change in sand stacking pattern, and often a strong seismic reflection with downlap. Fourth-order genetic-type sequences are also interpreted. The MFS is the easiest marker to identify and correlate on well logs. Fourth-order SB occur within these genetic units but are harder to identify and correlate.

  3. Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam

    SciTech Connect

    McMillen, K.J. (Beaver Creek Tech. Co., Mason, TX (United States)); Do Van Luu; Lee, E.K.; Hong, S.S. (PEDCO, Ho Chi Minh City (Viet Nam))

    1996-01-01

    An integrated well log, biostratigraphic, and seismic stratigraphic study of Miocene to Recent deltaic sediments deposited in the Nam Con Son Basin offshore from southern Vietnam shows the influence of eustacy and tectonics on sequence development. Sediments consist of Oligocene non-marine rift-basin fill (Cau Formation), early to middle Miocene tide-dominated delta plain to delta front sediments (TB 1.5 to TB 2.5, Due and Thong Formations), and late Miocene to Recent marine shelf sediments (TB. 2.6 to TB 3.1 0, Mang Cau, Nam Con Son, and Bien Dong Formations). Eustacy controlled the timing of key surfaces and sand distribution in the tectonically-quiet early Miocene. Tectonic effects on middle to late Miocene sequence development consist of thick transgressive systems tracts due to basin-wide subsidence and transgression, sand distribution in the basin center, and carbonate sedimentation on isolated fault blocks within the basin. Third-order sequence boundaries (SB) are identified by spore peaks, sand stacking patterns, and channel incision. In the basin center, widespread shale beds with coal occur above sequence boundaries followed by transgressive sandstone units. These TST sandstones merge toward the basin margin where they lie on older HST sandstones. Maximum flooding surfaces (MFS) have abundant marine microfossils and mangrove pollen, a change in sand stacking pattern, and often a strong seismic reflection with downlap. Fourth-order genetic-type sequences are also interpreted. The MFS is the easiest marker to identify and correlate on well logs. Fourth-order SB occur within these genetic units but are harder to identify and correlate.

  4. Occupational exposure to airborne contaminants during offshore oil drilling.

    PubMed

    Kirkhus, Niels E; Thomassen, Yngvar; Ulvestad, Bente; Woldbæk, Torill; Ellingsen, Dag G

    2015-07-01

    The aim was to study exposure to airborne contaminants in oil drillers during ordinary work. Personal samples were collected among 65 drill floor workers on four stationary and six moveable rigs in the Norwegian offshore sector. Air concentrations of drilling mud were determined based on measurements of the non-volatile mud components Ca and Fe. The median air concentration of mud was 140 ?g m(-3). Median air concentrations of oil mist (180 ?g m(-3)), oil vapour (14 mg m(-3)) and organic carbon (46 ?g m(-3)) were also measured. All contaminants were detected in all work areas (drill floor, shaker area, mud pits, pump room, other areas). The highest air concentrations were measured in the shaker area, but the differences in air concentrations between working areas were moderate. Oil mist and oil vapour concentrations were statistically higher on moveable rigs than on stationary rigs, but after adjusting for differences in mud temperature the differences between rig types were no longer of statistical significance. Statistically significant positive associations were found between mud temperature and the concentrations of oil mist (Spearman's R = 0.46) and oil vapour (0.39), and between viscosity of base oil and oil mist concentrations. Use of pressure washers was associated with higher air concentrations of mud. A series of 18 parallel stationary samples showed a high and statistically significant association between concentrations of organic carbon and oil mist (r = 0.98). This study shows that workers are exposed to airborne non-volatilized mud components. Air concentrations of volatile mud components like oil mist and oil vapour were low, but were present in all the studied working areas. PMID:26020723

  5. Conventional measurement data: good enough for offshore meteorology?

    NASA Astrophysics Data System (ADS)

    Schmidt, Michael; Tambke, Jens; Steinfeld, Gerald; Heinemann, Detlev

    2014-05-01

    The analysis of marine boundary layer properties is an fundamental task of energy meteorology. The determination of atmospheric stability and momentum fluxes out of measurement data is, for example, important for the validation of mesoscale models such as WRF and COSMO, but also for the validation of microscale models like PALM large eddy simulations. From them, major conclusions are drawn for the design of wind turbines and the layout design of entire offshore wind farms with 20 to more than 100 turbines. Up to now, high-resolution measurements of the vertical wind are usually carried out with sonic anemometers, which are known to provide simultaneously (sound-) temperature signals. Recent investigations of data from different met masts in the North Sea have revealed errors now, which can be corrected only partially. A method will be shown for visualization of a sonic anemometers influence on the mean vertical wind speed and how it can be adjusted. Another sonic anemometer dysfunction, the striking, not by meteorology explainable underestimation of vertical wind events for lots of fine wind direction segments can only be demonstrated so far, but not explained or actually corrected. The quality of sonic anemometer measurements of mean temperatures is proved to be poor to mediocre - depending on the type of the device. Furthermore, there is no evidence about the quality of the high-frequency temperature fluctuation measurements, simply because comparative measurements are missing. Temperature measurements with sonic anemometers under controlled laboratory conditions and comparisons with other fast temperature measurements techniques must be performed in order to gain more certainty on this issue. Temperature difference sensors are producing data in agreement with theory. Such a sensor is already installed on a North Sea met mast. Some new temperature difference sensor results will be presented. New methods, especially for high-frequency and high-quality measurements of vertical wind speeds, have to be developed in the very near future for serving the high and increasing needs of modelers.

  6. Building the Hibernia: Newfoundland's huge offshore platform

    SciTech Connect

    Irving, B.

    1994-10-01

    It seems most of the world is cooperating in the construction of one of the largest offshore oil platforms ever built. Steels are coming into Newfoundland, where final assembly is being conducted, from Belgium, Italy, Germany; stainless steels from Sweden; and titanium from the US. Welding electrodes are being shipped in from Montreal, from Holland, even from Cleveland. The objective is to tap the 615 million barrels (bbl) of oil that lie in the Hibernia field on the Grand Banks, some 195 miles (315 km) east southeast of St. John's, Newfoundland. Actual welding is going on in numerous locations. Although the platform is a concrete base structure, 37,000 metric tons of structural steel is being welded in order to complete the topsides assembly. In charge of all construction work is the Hibernia Management and Development Co., Ltd. (HMDC), an operating company formed by the four owner companies. The topsides segment of the Hibernia platform is divided into five major modules. It consists of five super modules and seven topside-mounted structures (TMS). One super module is being built in Bull Arm in Newfoundland. The process module and the living quarters module are being built by Hyundai Heavy Industries, South Korea, while the mud and utility modules are being fabricated by Belleli, s.p.a., Italy. The five super modules and the seven TMS will be brought together in Newfoundland where they will be welded together. All seven of the topside-mounted structures are being fabricated in Newfoundland. The assembled topsides will be towed to the site where they will be mated to the gravity base structure (GBS).

  7. Sanaga Sud field - Offshore Cameroon, west Africa

    SciTech Connect

    Pauken, R.J. (Mobil New Exploration Ventures Co., Dallas, TX (USA))

    1990-09-01

    The Sanaga Sud field, offshore Cameroon, is located just northwest of the coastal town of Kribi in the northern part of the Douala basin. The discovery well, Sanaga Sud A-1, was drilled in 1979 to test an apparent horst block that contained a prominent horizontal seismic amplitude. The Douala basin is one of a series of passive margin basins located along the coastline of central and southern Africa, and formed during the rifting of Africa and South America during the Early Cretaceous. Drilling results showed that the amplitude was a gas/water contact. Two appraisal wells, SSA-2 and SSA-3, were drilled in 1981. All three wells tested gas and condensate. Total recoverable hydrocarbons for the field are estimated to be approximately 1 tcf of gas. The trap in this field is composed of tilted and rotated fault blocks composed of interbedded Aptian to Albian sandstones, siltstones, and shales. The fault blocks were truncated by erosion (breakup unconformity) and later buried by a considerable thickness of onlapping Upper Cretaceous and Tertiary shale. The late Albian erosional unconformity forms the top of the trap over most of the field. Geochemical studies indicate a Lower Cretaceous source for the hydrocarbons. The gross pay thickness averages 250 m with an average porosity of 23% and an average permeability of 142 md. Reservoir lithologies range from well-sorted, massive sandstones to poorly sorted fine sandstones and siltstones containing shaly laminations that are carbonaceous and micaceous. The field is located predominantly in Block PH-38, but part of the field is in the Londji concession. Mobil Producing Cameroon, Inc., is the operator of PH-38 and Total Exploration and Production Cameroon is the operator of the Londji concession.

  8. Model test of an inverted conical cylinder floating offshore wind turbine moored by a spring-tensioned-leg

    NASA Astrophysics Data System (ADS)

    Shin, Hyunkyoung; Cho, Sangrai; Jung, Kwangjin

    2014-03-01

    A new 5-MW floating offshore wind turbine moored by a spring-tensioned-leg was proposed for installa­tion in about 50m water depth. Its substructure is a platform of the inverted conical cylinder type with massive ballast weight plate at the bottom. A 1:128 scale model was built for the preliminary engineering development. The model tests in waves and wind were carried out to estimate motion characteristics of this platform in the Ocean Engineering Wide Tank of the University of Ulsan. Its motions were measured and the RAOs were compared. The proposed floating off­shore wind turbine showed a good stability and decent responses in waves, wind and operation of the wind turbine.

  9. Jacket-free stir bar sorptive extraction with bio-inspired polydopamine-functionalized immobilization of cross-linked polymer on stainless steel wire.

    PubMed

    Zhang, Zixin; Zhang, Wenpeng; Bao, Tao; Chen, Zilin

    2015-08-14

    Stainless steel wire (SSW) is a good substrate for stir bar sorptive extraction (SBSE). However, it is still a challenge to immobilize commonly used cross-linked polymers onto SSW. In this work, we present a new approach for immobilization of the cross-linked organic polymer onto SSW for jacket-free SBSE. A dopamine derivative was firstly synthesized; by introducing a mussel-inspired polydopamine process, a stable coating layer was finally generated on the surface of SSW. Secondly, the cross-linked polymer was synthesized on the polydopamine-modified SSW by using acetonitrile as the porogen, acrylamide (AA) as the functional monomer, ethylene glycol dimethacrylate (EGDMA) as the cross-linker and 2,2'-azobis (2-methylpropionitrile) as the initiator. A diluted pre-polymerization solution was carefully prepared to generate a thin layer of the polymer. The prepared poly(EGDMA-AA)-modified stir bar showed high stability and good tolerance toward stirring, ultrasonication, organic solvents, and strong acidic and basic conditions. Morphology and structure characterization of coatings were performed by scanning electron microscopy and Fourier transform infrared spectra, respectively. The prepared poly(EGDMA-AA)-modified stir bar showed great extraction efficiency toward protoberberines, with enrichment factors of 19-42. An SBSE-HPLC method was also developed for quantitative analysis of protoberberines. The method showed low limits of detection (0.06-0.15ngmL(-1)), wide linear range (0.5-400ngmL(-1)), good linearity (R?0.9980) and good reproducibility (RSD?3.60% for intra-day, RSD?4.73% for inter-day). The developed method has been successfully applied to determine protoberberines in herb and rat plasma samples, with recoveries of 88.53-114.61%. PMID:26141275

  10. Lower cost offshore field development utilizing autonomous vehicles

    SciTech Connect

    Frisbie, F.R.; Vie, K.J.; Welch, D.W.

    1996-12-31

    The offshore oil and gas industry has the requirement to inspect offshore oil and gas pipelines for scour, corrosion and damage as well as inspect and intervene on satellite production facilities. This task is currently performed with Remotely Operated Vehicles (ROV) operated from dynamically positioned (DP) offshore supply or diving support boats. Currently, these tasks are expensive due to the high day rates for DP ships and the slow, umbilical impeded, 1 knot inspection rates of the tethered ROVs, Emerging Autonomous Undersea Vehicle (AUV) technologies offer opportunities to perform these same inspection tasks for 50--75% lower cost, with comparable or improved quality. The new generation LAPV (Linked Autonomous Power Vehicles) will operate from fixed facilities such as TLPs or FPFs and cover an operating field 10 kms in diameter.

  11. Proposing a Formalised Model for Mindful Information Systems Offshoring

    NASA Astrophysics Data System (ADS)

    Costello, Gabriel J.; Coughlan, Chris; Donnellan, Brian; Gadatsch, Andreas

    The central thesis of this chapter is that mathematical economics can provide a novel approach to the examination of offshoring business decisions and provide an impetus for future research in the area. A growing body of research indicates that projected cost savings from IT offshoring projects are not being met. Furthermore, evidence suggests that decision-making processes have been more emotional than rational, and that many offshoring arrangements have been rushed into without adequate analysis of the true costs involved. Building on the concept of mindfulness and mindlessness introduced to the IS literature by Swanson and Ramiller, a cost equation is developed using “deductive reasoning rather than inductive study” in the tradition of mathematical economics. The model endeavours to capture a wide range of both the quantitative and qualitative parameters. Although the economic model is illustrated against the background of a European scenario, the theoretical framework is generic and applicable to organisations in any global location.

  12. Evidence of offshore lake trout reproduction in Lake Huron

    USGS Publications Warehouse

    DeSorcie, Timothy J.; Bowen, Charles A., II

    2003-01-01

    Six Fathom Bank-Yankee Reef, an offshore reef complex, was an historically important spawning area believed to represent some of the best habitat for the rehabilitation of lake trout Salvelinus namaycush in Lake Huron. Since 1986, lake trout have been stocked on these offshore reefs to reestablish self-sustaining populations. We sampled with beam trawls to determine the abundance of naturally reproduced age-0 lake trout on these offshore reefs during May-July in 1994-1998 and 2000-2002. In total, 123 naturally reproduced lake trout fry were caught at Six Fathom Bank, and 2 naturally reproduced lake trout fry were caught at nearby Yankee Reef. Our findings suggest that this region of Lake Huron contains suitable habitat for lake trout spawning and offers hope that lake trout rehabilitation can be achieved in the main basin of Lake Huron.

  13. Offshore training in navy personnel is associated with uninvestigated dyspepsia.

    PubMed

    Li, Fan; Sun, Gang; Yang, Yun-sheng; Cui, Li-hong; Peng, Li-hua; Guo, Xu; Wang, Wei-feng; Yan, Bin; Zhang, Lanjing

    2014-12-01

    To investigate the known and new factors associated with uninvestigated dyspepsia (UD), we surveyed 8600 Chinese navy personnel with offshore training shorter than 1 month or longer than 9 months per year. All respondents were required to complete a questionnaire covering demographics, the Chinese version of the Rome III survey, eating habits, life styles, and medical and family history. The response rate was 94.3% (8106/8600) with 4899 respondents qualified for analysis, including 1046 with offshore training and 3853 with onshore training. The prevalence of UD was higher in the offshore group than in the onshore group (12.6% vs. 6.9%, P<0.001), with a general prevalence of 8.1%. The subjects with offshore training were more likely to suffer from UD and postprandial distress syndrome (OR=1.955, 95% CI 1.568-2.439, P<0.001 and OR=1.789, 95% CI 1.403-2.303, P<0.001, respectively). The multivariate logistic regression analysis showed UD was associated with offshore training (OR=1.580, 95% CI 1.179-2.118, P=0.002), family history (OR=1.765, 95% CI 1.186-2.626, P=0.005) and smoking (OR=1.270, 95% CI 1.084-1.488, P=0.003), but not with alcohol drinking. The association between dysentery history and UD was undetermined/borderline (P=0.056-0.069). In conclusion, we identified offshore training as a new factor associated with UD, and also confirmed 2 known associated factors, family history and smoking. PMID:25480574

  14. Offshore Renewable Energy R&D (Fact Sheet)

    SciTech Connect

    Not Available

    2011-10-01

    This fact sheet describes the offshore renewable energy R&D efforts at NREL's NWTC. As the United States increases its efforts to tap the domestic energy sources needed to diversify its energy portfolio and secure its energy supply, more attention is being focused on the rich renewable resources located offshore. Offshore renewable energy sources include offshore wind, waves, tidal currents, ocean and river currents, and ocean thermal gradients. According to a report published by the National Renewable Energy Laboratory (NREL) in 2010,1 U.S. offshore wind resources have a gross potential generating capacity four times greater than the nation's present electric capacity, and the Electric Power Research Institute estimates that the nation's ocean energy resources could ultimately supply at least 10% of its electric supply. For more than 30 years, NREL has advanced the science of renewable energy while building the capabilities to guide rapid deployment of commercial applications. Since 1993, NREL's National Wind Technology Center (NWTC) has been the nation's premier wind energy research facility, specializing in the advancement of wind technologies that range in size from a kilowatt to several megawatts. For more than 8 years, the NWTC has been an international leader in the field of offshore floating wind system analysis. Today, researchers at the NWTC are taking their decades of experience and extensive capabilities and applying them to help industry develop cost-effective hydrokinetic systems that convert the kinetic energy in water to provide power for our nation's heavily populated coastal regions. The center's capabilities and experience cover a wide spectrum of wind and water energy engineering disciplines, including atmospheric and ocean fluid mechanics, aerodynamics; aeroacoustics, hydrodynamics, structural dynamics, control systems, electrical systems, and testing.

  15. 78 FR 28164 - Special Local Regulation; Aguada Offshore Grand Prix, Bahia de Aguadilla; Aguada, PR

    Federal Register 2010, 2011, 2012, 2013, 2014

    2013-05-14

    ...Local Regulation; Aguada Offshore Grand Prix, Bahia de Aguadilla; Aguada, PR AGENCY...Puerto Rico during the Aguada Offshore Grand Prix, a high speed boat race. The event is...States during the Aguada Offshore Grand Prix. D. Discussion of Proposed Rule On...

  16. Offshore Pariahs? Small Island Economies, Tax Havens, and the Reconfiguration of Global Finance

    Microsoft Academic Search

    John Christensen

    2002-01-01

    The stock of wealth held offshore is estimated at US$6 trillion. Many small island economies (SIEs) host offshore finance centers, and some SIEs are highly dependent upon offshore finance. Extreme examples have over 90% of government revenues derived from finance sector activities. Since 1998 a series of international initiatives have been launched to combat harmful tax practices, money laundering, and

  17. EFFICIENT DEVELOPMENT OF OFFSHORE WINDFARMS: WAKE AND BOUNDARY-LAYER INTERACTIONS

    Microsoft Academic Search

    Rebecca Barthelmie; Gunner Larsen; Hans Jørgensen; Hans Bergström; Mikael Magnusson; Kostas Rados; Bernhard Lange; Lars Christensen; Jørgen Højstrup; NEG MICON; Gerard Schepers; Terry Hegberg; Luuk Folkerts

    The objective of the ENDOW project is to evaluate, enhance and interface wake and boundary-layer models for utilisation offshore. The model hierarchy will form the basis of design tools for use by wind energy developers and turbine manufacturers to optimise power output from offshore wind farms through minimised wake effects and optimal grid connections. Databases from existing offshore wind farms

  18. Offshore Wind Jobs and Economic Development Impact: Four Regional Scenarios (Presentation)

    SciTech Connect

    Tegen, S.

    2014-11-01

    NREL's Jobs and Economic Development Impact (JEDI) Model for Offshore Wind, is a computer tool for studying the economic impacts of fixed-bottom offshore wind projects in the United States. This presentation provides the results of an analysis of four offshore wind development scenarios in the Southeast Atlantic, Great Lakes, Mid-Atlantic, and Gulf of Mexico regions.

  19. 33 CFR 334.905 - Pacific Ocean, offshore of Camp Pendleton, California; Fallbrook restricted area.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 2012-07-01 false Pacific Ocean, offshore of Camp Pendleton, California...AREA REGULATIONS § 334.905 Pacific Ocean, offshore of Camp Pendleton, California...offshore of Camp Pendleton in the Pacific Ocean, San Diego County, California. The...

  20. 33 CFR 334.905 - Pacific Ocean, offshore of Camp Pendleton, California; Fallbrook restricted area.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 2014-07-01 false Pacific Ocean, offshore of Camp Pendleton, California...AREA REGULATIONS § 334.905 Pacific Ocean, offshore of Camp Pendleton, California...offshore of Camp Pendleton in the Pacific Ocean, San Diego County, California. The...