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1

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

SciTech Connect

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.

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

2

Integral sliding mode control for offshore steel jacket platforms  

NASA Astrophysics Data System (ADS)

This paper is concerned with robust integral sliding mode control for an offshore steel jacket platforms subject to nonlinear wave-induced force and parameter perturbations. A robust integral sliding mode controller is designed to stabilize the dynamic model of the offshore steel jacket platform. It is shown through simulation results that the robust integral sliding mode control scheme can reduce the internal oscillations of the offshore steel jacket platform dramatically; and the performance of the offshore steel jacket platform under the robust integral sliding mode control scheme is better than the ones under the nonlinear control scheme and the dynamic output feedback control scheme.

Zhang, Bao-Lin; Han, Qing-Long; Zhang, Xian-Ming; Yu, Xinghuo

2012-07-01

3

Repairing an offshore jacket structure proves cost effective  

SciTech Connect

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.

Still, J.R.; Blackwood, V.

2000-05-01

4

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

NASA Astrophysics Data System (ADS)

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.

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

2012-09-01

5

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

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

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

2013-01-01

6

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

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

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

2013-01-01

7

Active vibration H? control of offshore steel jacket platforms using delayed feedback  

NASA Astrophysics Data System (ADS)

This paper is concerned with delayed H? control for an offshore steel jacket platforms subject to external wave force. By artificially introducing a proper time-delay into control channel, a delayed H? controller is designed to attenuate the wave-induced vibration of the offshore platform and thereby improve the control performance of the system. The problem of the controller design is transformed into a nonlinear minimization problem. It is shown through simulation results that compared with the delay-free H? control scheme, the vibration amplitudes of the offshore steel jacket platform with the delayed H? control scheme are in the same level as the ones with the delay-free H? control scheme, while the required control force by the delayed H? control scheme is much smaller than that by the delay-free H? control scheme. Compared with the feedforward and feedback optimal control scheme, both the vibration amplitudes of the offshore platform and the required control force with the delayed H? control scheme are smaller than the ones with the feedforward and feedback optimal control scheme.

Zhang, Bao-Lin; Tang, Gong-You

2013-10-01

8

Effects of small time-delays on dynamic output feedback control of offshore steel jacket structures  

NASA Astrophysics Data System (ADS)

This paper investigates the effect of a small time-delay on dynamic output feedback control of an offshore steel jacket structure subject to a nonlinear wave-induced force. First, a conventional dynamic output feedback controller is designed to reduce the internal oscillations of the offshore structure. It is found that the designed controller is of a larger gain in the sense of Euclidean norm, which demands a larger control force. Second, a small time-delay is introduced intentionally to design a new dynamic output feedback controller such that (i) the controller is of a small gain in the sense of Euclidean norm and (ii) the internal oscillations of the offshore structure can be dramatically reduced. It is shown through simulation results that purposefully introducing time-delays can be used to improve control performance.

Zhang, Xian-Ming; Han, Qing-Long; Han, Dongsheng

2011-08-01

9

Life Jackets and Life Preservers  

MedlinePLUS

... Life Jackets and Life Preservers Safety & Prevention Listen Life Jackets and Life Preservers Article Body If your family enjoys boating, ... weight. Check the user weight on the label. Life Jackets TYPE 1: This jacket floats the best. ...

10

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

E-print Network

of mass CR Center of rigidity ? Standard deviation COV Coefficient of variation ? Height of offshore platform ? Water depth ? Clearance between MSL and platform deck ? Wave height ? Wave period ? Wave frequency ? Current velocity ? Platform mass...? Figure 2-3. Schematic illustration of wave relative to mean sea level (MSL). ................ 22? Figure 2-4. Example maximum drift contour of platform deck. ...................................... 24? Figure 2-5. Lower bound Type I and Type II drift...

Fallon, Michael Brooks

2012-11-12

11

The role of redundancy in jacket-type offshore platforms  

E-print Network

. 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... be proportionately increased before a failure mechanism would be formed in the structure, The UF, then, is the ratio of capacity used to capacity available. General relationships between redundancy and reli a- bility have been sought through the study of generic...

Womble, J'nina Elaine

1988-01-01

12

Optimisation and evaluation of pre-design models for offshore wind turbines with jacket support structures and their influence on integrated load simulations  

NASA Astrophysics Data System (ADS)

In recent years many advanced load simulation tools, allowing an aero-servo-hydroelastic analyses of an entire offshore wind turbine, have been developed and verified. Nowadays, even an offshore wind turbine with a complex support structure such as a jacket can be analysed. However, the computational effort rises significantly with an increasing level of details. This counts especially for offshore wind turbines with lattice support structures, since those models do naturally have a higher number of nodes and elements than simpler monopile structures. During the design process multiple load simulations are demanded to obtain an optimal solution. In the view of pre-design tasks it is crucial to apply load simulations which keep the simulation quality and the computational effort in balance. The paper will introduce a reference wind turbine model consisting of the REpower5M wind turbine and a jacket support structure with a high level of detail. In total twelve variations of this reference model are derived and presented. Main focus is to simplify the models of the support structure and the foundation. The reference model and the simplified models are simulated with the coupled simulation tool Flex5-Poseidon and analysed regarding frequencies, fatigue loads, and ultimate loads. A model has been found which reaches an adequate increase of simulation speed while holding the results in an acceptable range compared to the reference results.

Schafhirt, S.; Kaufer, D.; Cheng, P. W.

2014-12-01

13

The heat transfer characteristics of the jacket-type radial heat pipe  

NASA Astrophysics Data System (ADS)

A simple, rapid mathematical model to calculate the non-steady-state startup process of the jacket-type radial heat pipe is presented in this paper. The model is based on the special structure and using conditions of the jacket-type radial heat pipe, the vapor temperature in heat pipe only changes over time. The startup performance of the heat pipe with variation input heat flux and the filling rate is analyzed. The results manifest that the filling rate increased will reduce the maximum operating temperature of the heat pipe and shorten the startup time of the heat pipe. With the increase of input heat flux, the operating temperature increases and the time to reach the steady state of the heat pipe is added. The total thermal resistance of heat pipe decreases with the increase of the input heat flux and filling rate. The variation of the local convective heat transfer coefficient and the maximum temperature of the water are investigated with different cooling water inlet conditions.

Jiao, Yonggang; Xia, Guodong; Wang, Dan

2013-07-01

14

Fire Protection Jacket  

NASA Technical Reports Server (NTRS)

NERAC, Inc., Tolland, CT, aided Paul Monroe Engineering, Orange, CA, in the development of their PC1200 Series Fire Protection Jacket that protects the oil conduit system on an offshore drilling platform from the intense hydrocarbon fires that cause buckling and could cause structural failure of the platform. The flame-proof jacketing, which can withstand temperatures of 2000 degrees Fahrenheit for four hours or more, was developed from a combination of ceramic cloth (similar to the ceramic in Space Shuttle tiles), and laminates used in space suits.

1991-01-01

15

Optimum geometry of tuned liquid column-gas damper for control of offshore jacket platform vibrations under seismic excitation  

NASA Astrophysics Data System (ADS)

In this study, the effectiveness of a tuned liquid column-gas damper, TLCGD, on the suppression of seismicinduced vibrations of steel jacket platforms is evaluated. TLCGD is an interesting choice in the case of jacket platforms because it is possible to use the structural elements as the horizontal column of the TLCGD. The objective here is to find the optimum geometric parameters, namely orientation and configuration of vertical columns, length ratio, and area ratio of the TLCGD, considering nonlinear damping of the TLCGD and water-structure interaction between the jacket platform and sea water. The effects of different characteristics of ground motion such as PGA and frequency content on the optimum geometry are also investigated and it is observed that these features have some influence on the optimum area ratio. Finally it is observed that pulse arrangement of ground acceleration is one of the most important parameters affecting the efficiency of a TLCGD. In other words, it is found that the TLCGD's capability to reduce the RMS responses depends only on the frequency content of the ground acceleration, but its capability to reduce the maximum responses depends on both the frequency content and the pulse arrangement of the ground acceleration.

Mousavi, Seyed Amin; Zahrai, Seyed Mehdi; Bargi, Khosrow

2012-12-01

16

Jacketed lamp bulb envelope  

DOEpatents

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.

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

17

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

E-print Network

As more oil and gas are discovered in deeper water than ever before, the offshore industry has become increasingly interested in the design of advanced offshore production platforms. A new design concept called FLOATING JACKET (FJ) is studied...

Xu, Yufeng

2012-06-07

18

Hypervelocity jacketed penetrators  

Microsoft Academic Search

The use of steel jackets was found to significantly improve the penetration efficiency of tungsten alloy rods. Experiments and analyses were conducted with L\\/D=10 projectiles of constant exterior dimensions at a nominal impact velocity of 2.2 km\\/s. The fraction of jacket material was varied to see which geometry would have the best performance. For a core-to-jacket diameter ratio (?) of

Bradley A Pedersen; Stephan J Bless; James U Cazamias

2001-01-01

19

Variable pressure thermal insulating jacket  

DOEpatents

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.

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

1994-01-01

20

Variable pressure thermal insulating jacket  

DOEpatents

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.

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

1994-09-20

21

Regeneratively Cooled Porous Media Jacket  

NASA Technical Reports Server (NTRS)

The fluid and heat transfer theory for regenerative cooling of a rocket combustion chamber with a porous media coolant jacket is presented. This model is used to design a regeneratively cooled rocket or other high temperature engine cooling jacket. Cooling jackets comprising impermeable inner and outer walls, and porous media channels are disclosed. Also disclosed are porous media coolant jackets with additional structures designed to transfer heat directly from the inner wall to the outer wall, and structures designed to direct movement of the coolant fluid from the inner wall to the outer wall. Methods of making such jackets are also disclosed.

Mungas, Greg (Inventor); Fisher, David J. (Inventor); London, Adam Pollok (Inventor); Fryer, Jack Merrill (Inventor)

2013-01-01

22

46 CFR 117.71 - Life jackets.  

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

23

46 CFR 117.71 - Life jackets.  

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

24

46 CFR 117.71 - Life jackets.  

...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...

2014-10-01

25

Life Jacket Policy Study 15 Jan 2012  

E-print Network

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

US Army Corps of Engineers

26

46 CFR 117.71 - Life jackets.  

Code of Federal Regulations, 2010 CFR

...Shipping 4 2010-10-01 2010-10-01 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...

2010-10-01

27

46 CFR 117.71 - Life jackets.  

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

28

Life Jacket Mandate Study Interim Report  

E-print Network

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

US Army Corps of Engineers

29

THE JACKET LAYER IN SASSAFRAS  

Microsoft Academic Search

In the ovules of some angiosperms a definite nutritive tissue invests the embryo-sac, while in others no such layer exists. This nutritive jacket appears in all cases to be simply a modifica- tion of one or more layers of cells on the inner wall of the ovule. It is purely a physiological tissue and is usually described as consisting of

JOHN H. SCHAFFNER

30

Wearable firmware: the Singing Jacket  

Microsoft Academic Search

This paper discusses a design for a purpose-built interface that a wearer uses for controlling sound through movement. It presents work done so far on a mobile sound installation called the Singing Jacket and looks at ways in which the design can benefit from new developments in microcontroller technology. Several differen microcontrollers are reviewed along with additional peripherals used for

Greg Schiemer; Mark Havryliv

31

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

SciTech Connect

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.

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

32

Hydroelastic responses of pontoon type very large floating offshore structure  

SciTech Connect

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.

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

1996-12-31

33

46 CFR 180.78 - Stowage of life jackets.  

Code of Federal Regulations, 2012 CFR

...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....

2012-10-01

34

46 CFR 117.78 - Stowage of life jackets.  

Code of Federal Regulations, 2012 CFR

...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....

2012-10-01

35

46 CFR 117.78 - Stowage of life jackets.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 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....

2010-10-01

36

46 CFR 117.75 - Life jacket lights.  

Code of Federal Regulations, 2011 CFR

...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....

2011-10-01

37

46 CFR 180.78 - Stowage of life jackets.  

...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....

2014-10-01

38

46 CFR 180.75 - Life jacket lights.  

Code of Federal Regulations, 2013 CFR

...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....

2013-10-01

39

46 CFR 117.75 - Life jacket lights.  

Code of Federal Regulations, 2010 CFR

...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....

2010-10-01

40

46 CFR 117.75 - Life jacket lights.  

...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....

2014-10-01

41

46 CFR 180.78 - Stowage of life jackets.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 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....

2010-10-01

42

46 CFR 180.78 - Stowage of life jackets.  

Code of Federal Regulations, 2013 CFR

...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....

2013-10-01

43

46 CFR 117.78 - Stowage of life jackets.  

Code of Federal Regulations, 2011 CFR

...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....

2011-10-01

44

46 CFR 180.75 - Life jacket lights.  

Code of Federal Regulations, 2010 CFR

...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....

2010-10-01

45

46 CFR 117.78 - Stowage of life jackets.  

Code of Federal Regulations, 2013 CFR

...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....

2013-10-01

46

46 CFR 180.75 - Life jacket lights.  

...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....

2014-10-01

47

46 CFR 117.78 - Stowage of life jackets.  

...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....

2014-10-01

48

46 CFR 117.75 - Life jacket lights.  

Code of Federal Regulations, 2013 CFR

...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....

2013-10-01

49

46 CFR 180.75 - Life jacket lights.  

Code of Federal Regulations, 2012 CFR

...Shipping 7 2012-10-01 2012-10-01 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....

2012-10-01

50

46 CFR 180.75 - Life jacket lights.  

Code of Federal Regulations, 2011 CFR

...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....

2011-10-01

51

46 CFR 180.78 - Stowage of life jackets.  

Code of Federal Regulations, 2011 CFR

...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....

2011-10-01

52

46 CFR 117.75 - Life jacket lights.  

Code of Federal Regulations, 2012 CFR

...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....

2012-10-01

53

Offshore medicine.  

PubMed

Offshore life can be refreshing for medics who are looking for a little change of pace; however, it is not for everyone. Working offshore can be the easiest or most boring job you'll ever have. It takes a specific type of medic to fit this mold. So, if you are considering a career in the offshore field, take all of the above into consideration. You are not just making a change in jobs, but a change in lifestyle. Once you become accustomed to this lifestyle, it will be hard to go back to the everyday hustle and bustle of the streets. For more information about working offshore, contact Acadian Contract Services at 800/259-333, or visit www.acadian.com. PMID:11258303

Baker, D

2001-03-01

54

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

SciTech Connect

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.

Not Available

1989-01-01

55

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

SciTech Connect

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.

Korsgaard, J.; Hutter, L.

1995-12-01

56

A study of the development of a new type of bulb bracket for offshore structures using suitable casting steel  

NASA Astrophysics Data System (ADS)

In this study, the optimum structural design of brackets for offshore structures was carried out through the ANSYS program. We wished to propose a new type of bulb bracket made by a casting process compared with the built-up type of bracket. For a better structural design of the bracket, we can't adopt face plate but stiffener and circular type shape at the diagonal surface line. Under the new type of bulb bracket made by a casting process, it was possible to reduce the size by about 30% and the weight by about 50% compared with the face-plate type of bracket.

Kim, Tae-Won; Kang, Chung-Gil; Park, Sang-Sik

2010-06-01

57

Extending cable life with better jackets  

SciTech Connect

Better materials may result from a $1.1 million research program funded by the Electric Power Research Institute, Palo Alto, California and awarded to Southwire Co., Carrollton, Ga. The University of Connecticut`s Electrical Insulation Center (EIRC) will assist Southwire in testing the results of a recent study that found a promising new way to improve the protective jackets on underground power cables. EIRC`s Director Matthew Mashikian said, {open_quotes}Extending the life of power cables with a better jacket is worth millions to utility companies and their customers.{close_quotes} EIRC has a patent pending on a method of using chemical scavengers to reduce the presence of ions in groundwater that can penetrate a power cable`s jacket and invade the insulation.

NONE

1995-05-01

58

HUNTER 10, TRUFLO GONDOLA WEIGHTS AND JACKET. PIVOTING ARMS RAISE ...  

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

HUNTER 10, TRUFLO GONDOLA WEIGHTS AND JACKET. PIVOTING ARMS RAISE THE JACKET AND WEIGHTS. A PNEUMATIC SHOVEL PUSHES THE MORE RECENTLY POURED MOLD INTO THE COOLED MOLD, FORCING THE LATTER ONTO THE VIBRATING SHAKEOUT CONVEYOR AND LEAVING A SPACE UNDER THE RAISED JACKET AND WEIGHTS FOR A FRESHLY MADE UNPOURED MOLD. - Southern Ductile Casting Company, Casting, 2217 Carolina Avenue, Bessemer, Jefferson County, AL

59

69kV High-Pressure Oil-Filled Pipe-Type Submarine Lines to Offshore Drilling Islands  

Microsoft Academic Search

A dual 69-kV high-pressure oil-filled pipe-type cable system was recently installed by the Southern California Edison Company, Los Angeles, Calif., to serve four offshore oil drilling islands in Long Beach Harbor. Each line is capable of carrying the entire load with parallel line out of service. A submarine pipeline was severed and repaired. Cable pulls, believed to be the longest

William Torok

1969-01-01

60

Jacketed cryogenic piping is stress relieved  

NASA Technical Reports Server (NTRS)

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.

Bowers, W. M.

1967-01-01

61

Protective riser-conductor for offshore structures  

SciTech Connect

A protective sleeve for fitting about the periphery of the leg of an offshore structure. The sleeve comprises means for carrying and enclosing a plurality of conductors. It further includes one or more inner rings; an outer jacket is fixedly spaced from the rings to define longitudinal passages within which the respective conductors are fixedly positioned. The sleeve is capable of deflecting packed ice and floating objects which represent possible sources of damage to the structure or to conductors.

Rutherford, D. A.; Albers, G. P.

1985-07-09

62

Seismic fragility analysis of lap-spliced reinforced concrete columns retrofitted by SMA wire jackets  

NASA Astrophysics Data System (ADS)

The aim of this study is to provide seismic fragility curves of reinforced concrete columns retrofitted by shape memory alloy wire jackets and thus assess the seismic performance of the columns against earthquakes, comparing them with reinforced concrete columns with lap-spliced and continuous reinforcement. For that purpose, this study first developed analytical models of the experimental results of the three types of columns, (1) lap-spliced reinforcement, (2) continuous reinforcement and (3) lap-spliced reinforcement and retrofitted by SMA wire jackets, using the OpenSEES program, which is oriented to nonlinear dynamic analysis. Then, a suite of ten recorded ground motions was used to conduct dynamic analyses of the analytical models with scaling of the peak ground acceleration from 0.1g to 1.0g in steps of 0.1g. From the static experimental tests, the column retrofitted with SMA wire jackets had a larger displacement ductility by a factor of 2.3 times that of the lap-spliced column, which was 6% larger compared with the ductility of the continuous reinforcement column. From the fragility analyses, the SMA wire jacketed column had median values of 0.162g and 0.567g for yield and collapse, respectively. For the yield damage state, the SMA wire jacketed column had a median value similar to the continuous reinforcement column. However, for the complete damage state, the SMA wire jacketed column showed a 1.33 times larger median value than the continuously reinforcement column.

Choi, Eunsoo; Park, Sun-Hee; Chung, Young-Soo; Kim, Hee Sun

2013-08-01

63

Tensile test of SS 316LN jacket with different conditions  

NASA Astrophysics Data System (ADS)

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.

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

64

Ported jacket for use in deformation measurement apparatus  

DOEpatents

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.

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

65

Ported jacket for use in deformation measurement apparatus  

DOEpatents

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 which 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. 9 figs.

Wagner, L.A.; Senseny, P.E.; Mellegard, K.D.; Olsberg, S.B.

1990-03-06

66

Testing and evaluation of damaged tubular jacket braces  

E-print Network

. Terry L. Kohutek This paper presents results of research conducted on damaged, steel, tubular members salvaged from in-service, offshore, drilling and production platforms. Twenty members with various types of damage were tested in axial compression... 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...

Moehlman, Scott Alan

1990-01-01

67

Lightweight Vacuum Jacket for Cryogenic Insulation. Volume 1  

NASA Technical Reports Server (NTRS)

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.

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

1975-01-01

68

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.

69

"Punk" rock can be bad for you: a case of surgical emphysema from a "punk" rocker's leather jacket  

PubMed Central

Stab wounds to the thorax are seen in the emergency department (ED) and can be caused by a variety of mechanisms. This case highlights an unusual cause of injury: a leather jacket with spikes on the back of it. This type of jacket is often worn by "punks" as a fashion statement. We report that falling onto such a jacket may result in accidental thoracic injury leading to subcutaneous emphysema. A thorough clinical assessment is mandatory to exclude underlying lung injury or pneumothorax. In patients with subcutaneous emphysema and an otherwise normal chest radiograph, an in hospital observation period of 24?hours to check for any delayed complications is adequate if the patient remains clinically stable. PMID:16714489

Lane, N; Graudins, A

2006-01-01

70

"Punk" rock can be bad for you: a case of surgical emphysema from a "punk" rocker's leather jacket.  

PubMed

Stab wounds to the thorax are seen in the emergency department (ED) and can be caused by a variety of mechanisms. This case highlights an unusual cause of injury: a leather jacket with spikes on the back of it. This type of jacket is often worn by "punks" as a fashion statement. We report that falling onto such a jacket may result in accidental thoracic injury leading to subcutaneous emphysema. A thorough clinical assessment is mandatory to exclude underlying lung injury or pneumothorax. In patients with subcutaneous emphysema and an otherwise normal chest radiograph, an in hospital observation period of 24 hours to check for any delayed complications is adequate if the patient remains clinically stable. PMID:16714489

Lane, N; Graudins, A

2006-06-01

71

Optical fiber magnetic field sensors with ceramic magnetostrictive jackets.  

PubMed

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

Sedlar, M; Paulicka, I; Sayer, M

1996-09-20

72

Turbulator for a liner cooling jacket  

NASA Technical Reports Server (NTRS)

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.

Hoag, Kevin L. (Inventor)

1995-01-01

73

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

PubMed

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

Paté-Cornell, M E

1990-11-30

74

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

SciTech Connect

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.

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

2012-11-01

75

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

Code of Federal Regulations, 2013 CFR

... 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...

2013-10-01

76

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

Code of Federal Regulations, 2011 CFR

... 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...

2011-10-01

77

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

Code of Federal Regulations, 2013 CFR

... 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...

2013-10-01

78

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

Code of Federal Regulations, 2012 CFR

... 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...

2012-10-01

79

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

Code of Federal Regulations, 2010 CFR

... 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...

2010-10-01

80

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

Code of Federal Regulations, 2012 CFR

... 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...

2012-10-01

81

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

... 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...

2014-10-01

82

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

... 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...

2014-10-01

83

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

Code of Federal Regulations, 2010 CFR

... 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...

2010-10-01

84

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

Code of Federal Regulations, 2011 CFR

... 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...

2011-10-01

85

Red Jacket and the Decolonization of Republican Virtue  

ERIC Educational Resources Information Center

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…

Ganter, Granville

2007-01-01

86

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

87

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

DOEpatents

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.

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

2002-01-01

88

Calibration and validation of a spar-type floating offshore wind turbine model using the FAST dynamic simulation tool  

NASA Astrophysics Data System (ADS)

High-quality computer simulations are required when designing floating wind turbines because of the complex dynamic responses that are inherent with a high number of degrees of freedom and variable metocean conditions. 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. Wave basin tests with the spar attached to a scale model of the NREL 5-megawatt reference wind turbine were performed at the Maritime Research Institute Netherlands under the DeepCwind project. This project included free-decay tests, tests with steady or turbulent wind and still water (both periodic and irregular waves with no wind), and combined wind/wave tests. The resulting data from the 1/50th model was scaled using Froude scaling to full size and used to calibrate and validate a full-size simulated model in FAST. Results of the model calibration and validation include successes, subtleties, and limitations of both wave basin testing and FAST modeling capabilities.

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

2014-12-01

89

Strength analysis of CARR-CNS with crescent-shape moderator cell and helium sub-cooling jacket covering cell  

NASA Astrophysics Data System (ADS)

The new type of the moderator cell was developed for the cold neutron source (CNS) of the China Advanced Research Reactor (CARR) which is now being constructed at the China Institute of Atomic Energy in Beijing. A crescent-shape moderator cell covered by the helium sub-cooling jacket is adopted. The structure of the moderator cell is optimized by the stress FEM analysis. A crescent-shape would help to increase the volume of the moderator cell for fitting it to the four cold neutron guide tubes, even if liquid hydrogen, not liquid deuterium, was used as a cold moderator. The helium sub-cooling jacket covering the moderator cell removes the nuclear heating of the outer shell wall of the cell. It contributes to reduce the void fraction of liquid hydrogen in the outer shell of the moderator cell. Such a type of a moderator cell is suitable for the CNS with higher nuclear heating. The cold helium gas flows down first into the helium sub-cooling jacket and then flows up to the condenser. The theory of the self-regulation suitable to the thermo-siphon type of the CNS is also applicable and validated.

Yu, Qingfeng; Feng, Quanke; Kawai, Takeshi; Shen, Feng; Yuan, Luzheng; Cheng, Liang

2005-12-01

90

Optimal startup control of a jacketed tubular reactor.  

NASA Technical Reports Server (NTRS)

The optimal startup policy of a jacketed tubular reactor, in which a first-order, reversible, exothermic reaction takes place, is presented. A distributed maximum principle is presented for determining weak necessary conditions for optimality of a diffusional distributed parameter system. A numerical technique is developed for practical implementation of the distributed maximum principle. This involves the sequential solution of the state and adjoint equations, in conjunction with a functional gradient technique for iteratively improving the control function.

Hahn, D. R.; Fan, L. T.; Hwang, C. L.

1971-01-01

91

Condition monitoring approaches applied to a polychloroprene cable jacketing material  

Microsoft Academic Search

In this paper we examine the utility of several promising material condition monitoring (CM) techniques applied to a commercial polychloroprene cable jacketing material used in nuclear power plant applications. These include two relatively unknown approaches, cross-sectional modulus profiling and NMR T2 relaxation time measurements of solvent-swelled samples, as well as three more commonly used approaches, density, gel fraction and solvent

Kenneth T Gillen; Roger A Assink; Robert Bernstein

2004-01-01

92

Changing life jacket wearing behavior: an evaluation of two approaches.  

PubMed

In the United States during 1999-2012, about 4 per cent of adults wore life jackets while engaged in recreation on powerboats. Educational campaigns have promoted life jacket use. Mandatory use regulations target primarily children or boaters on personal watercrafts or water skiing. We describe findings from two interventions - 'Wear It California!', a targeted marketing campaign in the California Delta region and mandatory wear regulations at four US Army Corps of Engineers (USACE) lakes in the state of Mississippi. Before the campaign in the Delta, adult wear was 8.5 per cent, increasing to 12.1 per cent during the first year, dipping to 9.4 per cent during the second year, and rising slightly to 10.5 per cent 3 plus years after the campaign. Before mandatory regulations at USACE lakes, adult wear was 13.7 per cent, increasing to 75.6 per cent during the first year, 70.1 per cent during the second year, and remaining high at 68.1 per cent in the third year. Policymakers should consider these findings when choosing how to increase life jacket use. PMID:24430805

Mangione, Thomas; Chow, Wendy

2014-05-01

93

When in Rome : does Polygon need a jacket?  

NSDL National Science Digital Library

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

National Council of Teachers of Mathematics (NCTM)

2002-01-01

94

Tensile tests of ITER TF conductors jacket materials  

NASA Astrophysics Data System (ADS)

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.

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

2012-06-01

95

Vacuum jacketed composite propulsion feedlines for cryogenic launch and space vehicles, volume 1. [development of glass fiber composite for strength and protection from handling damage  

NASA Technical Reports Server (NTRS)

Thin metallic liners that provide leak-free service in cryogenic propulsion systems are overwrapped with a glass-fiber composite that provides strength and protection from handling damage. The resultant tube is lightweight, strong, and has a low thermal flux. The inside commodity flow line and the outside vacuum jacket were fabricated using this method. Several types of vacuum jackets were fabricated and tested at operating temperatures from 294 to 21 K (+70 to minus 423 F) and operating pressure up to 69 N/cm2 (100 psi). The primary objective of the program was to develop vacuum jacket concepts, using previously developed concepts for the inner line. All major program objectives were met resulting in a design concept that is adaptable to a wide range of aerospace vehicle requirements. Major items of development included convolution of thin metallic sections up to 46 cm (18 in.) in diameter, design and fabrication of an extremely lightweight tension membrane concept for the vacuum jacket, and analytical tools that predict the failure mode and levels.

Spond, D. E.; Laintz, D. J.; Hall, C. A.; Dulaigh, D. E.

1974-01-01

96

Stiffness and Confinement Ratios of SMA Wire Jackets for Confining Concrete  

NASA Astrophysics Data System (ADS)

This article discusses the effects of the stiffness and confinement ratios of shape memory alloy (SMA) wire jackets on the behavior of confined concrete. SMA wire jackets are an effective confining material to improve concrete behavior; for example, by increasing peak strength and failure strain. The stiffness and confinement ratios of fiber-reinforced polymer jackets have been extensively discussed and their effects are well known. However, assessment of the stiffness and confinement ratios of SMA wire jackets has not previously been conducted. In this study, we investigate the effects of the stiffness and confinement ratios of steel jackets, and then compare the results with those of SMA wire jackets. In general, the stiffness ratios of SMA wire jackets are relatively smaller than those of steel jackets, and most of them have lower stiffness ratios because the Young's moduli of the SMAs are relatively small. The active confining pressure of the SMA wires does not improve the lower stiffness-ratio effect since the amount of active confining pressure is not sufficiently large.

Choi, Eunsoo; Kim, Dong Joo; Youn, Heejung

2014-07-01

97

Variable pressure insulating jackets for high-temperature batteries  

NASA Astrophysics Data System (ADS)

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 C and a cold-side temperature of 25 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 C to 250 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.

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

1992-12-01

98

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

NASA Astrophysics Data System (ADS)

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 mm (L × D). The NiTiNb SMAs have a relatively wider temperature hysteresis than NiTi SMAs; thus, they are more suitable for the severe temperature-variation environments to which civil structures are exposed. Steel jackets of passive confinement are also prepared in order to compare the cyclic behavior of actively and passively confined concrete cylinders. For this purpose, monotonic and cyclic compressive loading tests are conducted to obtain axial and circumferential strain. Both strains are used to estimate the volumetric strains of concrete cylinders. Plastic strains from cyclic behavior are also estimated. For the cylinders jacketed by NiTiNb SMA wires, the monotonic axial behavior differs from the envelope of cyclic behavior. The plastic strains of the actively confined concrete show a similar trend to those of passive confinement. This study proposed plastic strain models for concrete confined by SMA wire or steel jackets. For the volumetric strain, the active jackets of NiTiNb SMA wires provide more energy dissipation than the passive jacket of steel.

Park, Joonam; Choi, Eunsoo; Park, Kyoungsoo; Kim, Hong-Taek

2011-09-01

99

Offshore Wind Geoff Sharples  

E-print Network

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

Kammen, Daniel M.

100

CONGRESSIONAL BRIEFING Offshore Wind  

E-print Network

CONGRESSIONAL 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 the past decade. What has Europe learned that is applicable to a U.S. effort to deploy offshore wind off

Firestone, Jeremy

101

Pore Type Classification on Carbonate Reservoir in Offshore Sarawak using Rock Physics Model and Rock Digital Images  

NASA Astrophysics Data System (ADS)

It has been recognized that carbonate reservoirs are one of the biggest sources of hydrocarbon. Clearly, the evaluation of these reservoirs is important and critical. For rigorous reservoir characterization and performance prediction from geophysical measurements, the exact interpretation of geophysical response of different carbonate pore types is crucial. Yet, the characterization of carbonate reservoir rocks is difficult due to their complex pore systems. The significant diagenesis process and complex depositional environment makes pore systems in carbonates far more complicated than in clastics. Therefore, it is difficult to establish rock physics model for carbonate rock type. In this paper, we evaluate the possible rock physics model of 20 core plugs of a Miocene carbonate platform in Central Luconia, Sarawak. The published laboratory data of this area were used as an input to create the carbonate rock physics models. The elastic properties were analyzed to examine the validity of an existing analytical carbonate rock physics model. We integrate the Xu-Payne Differential Effective Medium (DEM) Model and the elastic modulus which was simulated from a digital carbonate rock image using Finite Element Modeling. The results of this integration matched well for the separation of carbonate pore types and sonic P-wave velocity obtained from laboratory measurement. Thus, the results of this study show that the integration of rock digital image and theoretical rock physics might improve the elastic properties prediction and useful for more advance geophysical techniques (e.g. Seismic Inversion) of carbonate reservoir in Sarawak.

Lubis, L. A.; Harith, Z. Z. T.

2014-03-01

102

Infrared detector Dewars - Increased LN2 hold time and vacuum jacket life spans  

NASA Technical Reports Server (NTRS)

IR detector Dewars commonly suffer from shorter than desired LN2 hold times and insulation jacket vacuum corruption over relatively short time periods. In an attempt to solve this problem for a 9144 detector Dewar, small 1 liter/s appendage ion pumps were selected for continuous pumping of the vacuum jackets. This procedure extended LN2 hold times from 20 to 60 h and virtually eliminated vacuum jacket corruption. Thus the detector systems are usable continuously over periods of 6 months or more.

Jennings, D. E.; Boyd, W. J.; Blass, W. E.

1976-01-01

103

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

NASA Technical Reports Server (NTRS)

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.

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

1975-01-01

104

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

NASA Astrophysics Data System (ADS)

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.

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

2010-03-01

105

Offshore Training  

ERIC Educational Resources Information Center

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)

Training Officer, 1974

1974-01-01

106

Underwater noise from three types of offshore wind turbines: estimation of impact zones for harbor porpoises and harbor seals.  

PubMed

Underwater noise was recorded from three different types of wind turbines in Denmark and Sweden (Middelgrunden, Vindeby, and Bockstigen-Valar) during normal operation. Wind turbine noise was only measurable above ambient noise at frequencies below 500 Hz. Total sound pressure level was in the range 109-127 dB re 1 microPa rms, measured at distances between 14 and 20 m from the foundations. The 1/3-octave noise levels were compared with audiograms of harbor seals and harbor porpoises. Maximum 1/3-octave levels were in the range 106-126 dB re 1 microPa rms. Maximum range of audibility was estimated under two extreme assumptions on transmission loss (3 and 9 dB per doubling of distance, respectively). Audibility was low for harbor porpoises extending 20-70 m from the foundation, whereas audibility for harbor seals ranged from less than 100 m to several kilometers. Behavioral reactions of porpoises to the noise appear unlikely except if they are very close to the foundations. However, behavioral reactions from seals cannot be excluded up to distances of a few hundred meters. It is unlikely that the noise reaches dangerous levels at any distance from the turbines and the noise is considered incapable of masking acoustic communication by seals and porpoises. PMID:19507958

Tougaard, Jakob; Henriksen, Oluf Damsgaard; Miller, Lee A

2009-06-01

107

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

USGS Publications Warehouse

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.

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

2003-01-01

108

A Simple, Inexpensive Water-Jacketed Cuvette for the Spectronic 20  

ERIC Educational Resources Information Center

The construction of a simple and inexpensive water-jacketed cuvette for the Spectronic 20 is described. This cuvette is utilized to determine the activation energy of the reaction between crystal violet and hydroxide ion spectrophotomerically.

Thompson, Jonathan E.; Ting, Jason

2004-01-01

109

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

SciTech Connect

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.

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

110

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

E-print Network

The steel-jacketed steam heating pipeline employs vacuum insulation to improve the insulating effect and reduce the corrosion, and hence increases the heat transfer efficiency of the heating network and building energy efficiency. It is important...

Na, W.; Zou, P.

2006-01-01

111

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

SciTech Connect

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.

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

2013-08-01

112

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

PubMed Central

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

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

2014-01-01

113

Rubber in offshore engineering  

Microsoft Academic Search

The offshore oil and gas industries have been turning increasingly to natural and synthetic rubbers for a very wide variety of uses, since they are flexible and highly corrosion-resistant in hostile marine environments, and exhibit predictable and reproducible behaviour under a wide range of physical conditions. This book considers the growing popularity of rubber as an offshore material, providing a

Stevenson

1984-01-01

114

Offshore Renewable Energy Solutions  

E-print Network

and maximising energy extraction. Offshore understanding Our long track record working with the oil and gasOffshore Renewable Energy Solutions #12;Cefas: meeting complex requirements The Centre and fisheries data. We also work collaboratively, with cross-cutting project teams, innovators in the supply

115

Seismic retroftting of RC columns with RC jackets and wing walls with different structural details  

NASA Astrophysics Data System (ADS)

An original reinforced concrete (RC) column and four strengthened specimens, two with RC jackets and two with wing walls, were tested in this study. The original column specimen was designed to comply with older (pre-1999) design standards so that the usual detailing deficiencies in existing school buildings in Taiwan could be simulated. Two different structural details were chosen to fabricate the full-scale specimens for each retrofitting technique. The study confirmed that either RC jacketing or the installation of wing walls with two different structural details can effectively improve the stiffness and strength of an existing column. RC jacketing shows a better improvement in energy dissipation and ductility when compared to the columns with wing walls installed. This is because the two RC jacketed columns experienced a flexural failure, while a shear failure was found in the two columns with the wing walls installed, and thus led to a drastic decrease of the maximum lateral strengths and ductility. Since many factors may affect the installation of a post-installed anchor, it is better to use standard hooks to replace post-installed anchors in some specific points when using RC jacketing or installing wing walls.

Chang, Shuenn-Yih; Chen, Ting-Wei; Tran, Ngoc-Cuong; Liao, Wen-I.

2014-06-01

116

Two models of high frequency chest compression therapy: interaction of jacket pressure and mouth airflow.  

PubMed

High frequency chest compression (HFCC) therapy assists clearing the secretions in the lung. This paper presents two mathematical models: 1) HFCC jacket function model (JFM) and 2) respiratory function model (RFM). JFM predicts the variation of the jacket pressure (Pj) from the respiratory pattern of mouth airflow (Fm). RFM predicts the HFCC induced mouth airflow (Fm) from the HFCC pulse pressures at the jacket (Pj). Fm and Pj were measured from a healthy subject during HFCC therapy. JFM, which was implemented with 2nd order system using prediction error method, shows the existence of breathing pattern at Pj. RFM, which was implemented with amplitude modulation technique, shows how the HFCC pulses affects to the Fm. JFM calculations match 78% of the measured respiratory pattern of Pj>. RFM calculations match 90% of measured HFCC induced Fm. These models can be used to test new breathing patterns before designing studies on patients having chronic obstructive pulmonary diseases. PMID:18002939

Lee, Yong Wan; Lee, Jongwon; Warwick, Warren J

2007-01-01

117

Heat-transfer phenomena in water-cooled zinc-fuming furnace jackets  

NASA Astrophysics Data System (ADS)

In the zinc slag-fuming process, zinc is removed from lead blast furnace slag by reduction with a coal-air mixture injected into the slag through submerged tuyeres. The furnace is constructed of water-cooled jackets which freeze a slag layer and contain the bath. This greatly reduces vessel wear caused by the violently agitated and corrosive bath. The jackets, however, fail due to the formation of cracks which grow from the slag face through the working face of the jacket to the water channel. In this study, in-plant measurements and mathematical modeling of heat transfer in the jackets have been combined to elucidate the mechanism of failure. The working face of a water jacket was instrumented with thermocouples and installed in a fuming furnace at the Trail smelter of Cominco Ltd., Trail, BC. Measurements revealed the presence of large thermal transients or temperature “spikes” in the panel in the region immediately above the tuyeres. These were generally observed during charging and tapping of the furnace and are likely associated with disturbances on the surface of the bath or gas injection effects when the liquid level is low. Temperatures at the midthickness were seen to rise by as much as 180 °C above the steady-state level. Under these conditions, low-cycle fatigue may lead to crack formation and propagation. A mathematical modeling analysis of the transient freezing phenomena indicates that the temperature spikes are associated with sudden slag falloff and direct contact of molten slag on the jacket. In order to reduce slag falloff, an increased number of anchoring fins should be used in critical areas.

Scholey, K. E.; Richards, G. G.; Samarasekera, I. V.

1991-04-01

118

RELIABILITY COMPARISON MODELS FOR OFFSHORE WIND TURBINES (OWT)  

E-print Network

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 of the reliability of these 5 Types Surrogate failure rate data Onshore wind turbines (OT) 1-1.5MW CONCLUSIONS

Bernstein, Joseph B.

119

Session: Offshore wind  

SciTech Connect

This session at the Wind Energy and Birds/Bats workshop consisted of two presentations. Due to time constraints, a discussion period was not possible. The session addressed the current state of offshore wind energy development. The first presentation ''Monitoring Program and Results: Horns Rev and Nysted'' by Jette Gaarde summarized selected environmental studies conducted to date at operating offshore wind turbine projects in Denmark and lessons from other offshore wind developments in Europe. Wildlife impacts studies from the Danish sites focused on birds, fish, and mammals. The second presentation ''What has the U.S. Wind Industry Learned from the European Example'' by Bonnie Ram provided an update on current permit applications for offshore wind developments in the U.S. as well as lessons that may be drawn from the European experience.

Gaarde, Jette; Ram, Bonnie

2004-09-01

120

American Institute of Aeronautics and Astronautics Foundation Models for Offshore Wind Turbines  

E-print Network

American Institute of Aeronautics and Astronautics 1 Foundation Models for Offshore Wind Turbines of alternative models for monopile pile foundations for shallow-water offshore wind turbines has on extreme loads) is the most common type of foundation used today for offshore wind turbines; the support structure connects

Manuel, Lance

121

Damage threshold of acrylic polymer jackets surrounded with optical fiber by UV laser  

NASA Astrophysics Data System (ADS)

Fabrication technique of fiber Bragg gratings (FBG) sensors, which is used the measurement of distortions of large scale architectural structures, requires a skillful technique, and consequently the costing becomes a problem. The fabrication technique without removing a polymer jacket can realize much easier fabrication and the cheaper cost. We have investigated the laser damage threshold of jackets in order to realize such a fabrication technique. The 3rd and the 4th harmonics of repetitive Nd:YAG laser pulse were used as light sources. An optical fiber coated untinged polymer jackets is used as a sample. The numbers of the shots against the same sample position was varied from 1 to 1200. As a result, damage thresholds at the shot number of 1200 were 6.9 J/cm2 and 0.9 J/cm2 for the wavelength of 355 nm and 266 nm, respectively. These values are corresponding to intensity of 1.3 MW/cm2 and 0.3 MW/cm2, respectively. It is considered that the fabrication of FBG, which need a typical intensity of ~kW/cm2, without removing the jacket should be possible by controlling the laser intensity between this level and the threshold.

Maezono, Yoshinari; Yousuke, Iwasa; Kurosawa, Kou; Katto, Masahito; Yokotani, Atsushi

2007-05-01

122

Arikan and Alamouti matrices based on fast block-wise inverse Jacket transform  

NASA Astrophysics Data System (ADS)

Recently, Lee and Hou (IEEE Signal Process Lett 13: 461-464, 2006) proposed one-dimensional and two-dimensional fast algorithms for block-wise inverse Jacket transforms (BIJTs). Their BIJTs are not real inverse Jacket transforms from mathematical point of view because their inverses do not satisfy the usual condition, i.e., the multiplication of a matrix with its inverse matrix is not equal to the identity matrix. Therefore, we mathematically propose a fast block-wise inverse Jacket transform of orders N = 2 k , 3 k , 5 k , and 6 k , where k is a positive integer. Based on the Kronecker product of the successive lower order Jacket matrices and the basis matrix, the fast algorithms for realizing these transforms are obtained. Due to the simple inverse and fast algorithms of Arikan polar binary and Alamouti multiple-input multiple-output (MIMO) non-binary matrices, which are obtained from BIJTs, they can be applied in areas such as 3GPP physical layer for ultra mobile broadband permutation matrices design, first-order q-ary Reed-Muller code design, diagonal channel design, diagonal subchannel decompose for interference alignment, and 4G MIMO long-term evolution Alamouti precoding design.

Lee, Moon Ho; Khan, Md Hashem Ali; Kim, Kyeong Jin

2013-12-01

123

Management of offshore wastes in the United States.  

SciTech Connect

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.

Veil, J. A.

1998-10-22

124

Solar power satellite offshore rectenna study  

NASA Technical Reports Server (NTRS)

Offshore rectennas are feasible and cost competitive with land rectennas but the type of rectenna suitable for offshore use is quite different from that specified in the present reference system. A nonground plane design minimizes the weight and greatly reduces the number of costly support towers. This perferred design is an antenna array consisting of individually encapsulated dipoles with reflectors or tagis supported on feed wires. Such a 5 GW rectenna could be built at a 50 m water depth site to withstand hurricane, winter storm, and icing conditions for a one time cost of $5.7 billion. Subsequent units would be about 1.3 less expensive. More benign and more shallow water sites would result in substantially lower costs. The major advantage of an offshore rectenna is the removal of microwave radiation from populated areas.

1980-01-01

125

Energy from Offshore Wind: Preprint  

SciTech Connect

This paper provides an overview of the nascent offshore wind energy industry including a status of the commercial offshore industry and the technologies that will be needed for full market development.

Musial, W.; Butterfield, S.; Ram, B.

2006-02-01

126

California offshore wind energy potential  

Microsoft Academic Search

This study combines multi-year mesoscale modeling results, validated using offshore buoys with high-resolution bathymetry to create a wind energy resource assessment for offshore California (CA). The siting of an offshore wind farm is limited by water depth, with shallow water being generally preferable economically. Acceptable depths for offshore wind farms are divided into three categories: ?20m depth for monopile turbine

Michael J. Dvorak; Cristina L. Archer; Mark Z. Jacobson

2010-01-01

127

NREL Software Aids Offshore Wind Turbine Designs (Fact Sheet)  

SciTech Connect

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.

Not Available

2013-10-01

128

Kentish Flats Offshore Wind Farm  

E-print Network

Kentish Flats Offshore Wind Farm #12;By August 2005 the offshore wind farm at Kentish Flats and offshore wind energy will contribute sig- nificantly to achieving this target. The Kentish Flats alone plateau just outside the main Thames shipping lanes. The Kentish Flats wind farm will comprise 30

Firestone, Jeremy

129

Combination offshore drilling rig  

Microsoft Academic Search

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

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

1986-01-01

130

Offshore Wind Energy Systems  

ERIC Educational Resources Information Center

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)

Musgrove, P.

1978-01-01

131

Titanium offers offshore advantages  

SciTech Connect

Titanium is slowly becoming the answer to many of the corrosion problems associated with offshore drilling and sour hydrocarbons. The possible implications of titanium's resistance to hypochlorite solutions is still under study. Various tests have been run on this and its alloys. A growing number of applications will also take advantage of the strength to weight ratio of titanium.

Gilbert, R.

1984-04-01

132

This is what you need to know to... Avoid Being Next! Wearing a Life Jacket Can Save Your Life  

E-print Network

This is what you need to know to... Avoid Being Next! Wearing a Life Jacket Can Save Your Life (caloric labyrinthitis) that causes you to become disoriented and not know which way is up. Also, boaters

US Army Corps of Engineers

133

Optimal performance-based design of FRP jackets for seismic retrofit of reinforced concrete frames  

Microsoft Academic Search

External bonding of fiber-reinforced polymer (FRP) composites is now a well-established technique for the strengthening\\/retrofit of reinforced concrete (RC) structures. In particular, confinement of RC columns with FRP jackets has proven to be very effective in enhancing the strength and ductility of columns, and has become a key technique for the seismic retrofit of RC structures. Despite the large amount

X. K. Zou; J. G. Teng; L. De Lorenzis; S. H. Xia

2007-01-01

134

Low smoke, non-corrosive, fire retardant cable jackets based on HNBR and EVM  

SciTech Connect

This article examines the properties of the polymers HNBR and EVM which make them good candidates for use in meeting the low smoke, non-corrosive, low toxicity and fire retardant requirements for electric safety cable jackets and electric insulation. Topics of the article include density, weight, and viscosity of each polymer, mechanical proprieties of each polymer, and other results of laboratory testing of these polymers.

Meisenheimer, H.

1991-06-01

135

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

NASA Astrophysics Data System (ADS)

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.

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

2015-02-01

136

Arctic offshore platform  

SciTech Connect

An offshore structure is disclosed for use in drilling and producing wells in arctic regions having a conical shaped lower portion that extends above the surface of the water and a cylindrical upper section. The conical portion is provided with a controlled stiffness outer surface for withstanding the loads produced by ice striking the structure. The stiffness properties of the outer shell and flexible members are designed to distribute the load and avoid high local loads on the inner parts of the structure.

Bhula, D.N.

1984-01-24

137

Image processing in offshore engineering  

SciTech Connect

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.

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

138

Solar power satellite offshore rectenna study  

NASA Technical Reports Server (NTRS)

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.

1980-01-01

139

The Future of Offshore Wind Energy  

E-print Network

1 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 in the waters around Europe #12;4 US Offshore Wind Projects Proposed Atlantic Ocean Gulf of Mexico Cape Wind

Firestone, Jeremy

140

Cost of Offshore Wind Energy Charlene Nalubega  

E-print Network

Cost of Offshore Wind Energy and Industrial Engineering The focus of my research is to estimate the cost of floating offshore wind turbines water as well as on land based wind farms. The specific offshore wind energy case under consideration

Mountziaris, T. J.

141

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

SciTech Connect

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.

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

1983-05-01

142

Offshore Drilling From Ice Platforms  

Microsoft Academic Search

This paper describes a method successfully developed for drilling offshore from a floating ice platform. This method has allowed exploration wells to be drilled economically in the Canadian Arctic islands without years of waiting for sophisticated offshore drilling vessels to be developed, financed, and built to operate in the severe ice conditions prevalent in the area.

G. L. Hood; H. J. Strain; D. J. Baudais

1976-01-01

143

Offshore outlook: the American Arctic  

SciTech Connect

Offshore areas in the American Arctic are highlighted and the development of the area is compared with other offshore areas where the required technology is more readily available. Principal areas are shown in which new concepts are being put to practice. Canada's east coast is examined. Several technological trends are reviewed to help operators accelerate the discovery and development of arctic petroleum reserves.

Jahns, M.O.

1985-05-01

144

Offshore oil prospects improve  

NASA Astrophysics Data System (ADS)

The issues, prospects, and environmental concerns about drilling for offshore oil and gas are being seen in a different light than at any other time during the past decade. Exploration drilling on offshore locations is proceeding at a high rate, and environmental concerns, while recognized as real, appear to be a lot less worrisome than might have been predicted a decade ago. Part of the reason for the changes in levels of concern results from the close monitoring programs that have been in effect for the past few years. Paul R. Ryan of the Woods Hole Oceanographic Institution recently described exploration activities on Georges Bank: “We now have the results of the first year of monitoring, and, although eight wells are considered a minimal observational test, there were no biological changes in the benthic community that could be attributed to drilling activity.” (Oceanus, 26, 2, 1983). The U.S. Geological Survey studied the Georges Bank drilling activities as well. Barium from drilling muds was detected at the sites, but in decreasing concentrations at distances away from drilling rigs. There was no evidence that the discharges caused biological changes. According to Ryan: “Postdrilling concentrates of barium were found to be within the range of predilling concentrations measured at other locations on the Bank. Concentrations of other metals measured were low and characteristic of unpolluted, coarse-grained sediment in other Continental Shelf areas.”

145

Pioneering offshore excellence  

SciTech Connect

Hibernia Management and Development Company Ltd. (HMDC) was formed in 1990 by a consortium of oil companies to develop their interests in the Hibernia and Avalon reservoirs offshore Newfoundland in a safe and environmentally responsible manner. The reservoirs are located 315km ESE of St. John`s in the North Atlantic. The water depth is about 80m. The entire Hibernia field is estimated to contain more than three billion barrels of oil in place and the owners development plan area is estimated to contain two billion barrels. Recoverable reserves are estimated to be approximately 615 million barrels. The Hibernia reservoir, the principle reservoir, is located at an average depth of 3,700m. HMDC is building a large concrete gravity based structure (GBS) that which will support the platform drilling and processing facilities and living quarters for 280 personnel. In 1997 the platform will be towed to the production site and production will commence late 1997. Oil will be exported by a 2 km long pipeline to an offshore loading system. Dynamically positioned tankers will then take the oil to market. Average daily production is expected to plateau between 125,000 and 135,000 BOPD. It will be the first major development on the east coast of Canada and is located in an area that is prone to pack ice and icebergs.

Kent, R.P.; Grattan, L.

1996-11-01

146

Experimental evaluation of energy efficiency in a gas-heated self-contained steam jacketed kettle  

NASA Astrophysics Data System (ADS)

Gas Technological Development Center (CDT de GAS) has developed a new gas-heated self-contained steam jacketed kettle as a solution for temperature-controlled cooking of pulp fruit in the Colombian traditional candy-making industry. This initiative seeks to contribute to the promotion of natural gas as a cleaner and more efficient alternative to traditional fuels such as wood and coal in the Andean countries. Prototype follows the operational and safety rules provided by international and local standards: ASTM-F1602, ASME (section VIII, division 1), and NTC-4082. This paper presents the methodology, experimental setup and results obtained during the performance tests for heating efficiency evaluation of the kettle, according to the ASTM-F1785 standard, and the estimation of measurement uncertainty according to GUM method. The heating efficiency rate for this new prototype is higher to the convectional and commercial models of gas heated self-contained steam jacketed kettle. The results showed a heating efficiency of 63.83% ± 1.66% (k=2), whereas the emission of CO and NOX in stack gases was under the regulate limits for natural gas equipment.

Manrique, V.; García, L.; Alfonso, J.

2014-06-01

147

Airborne sound propagation over sea during offshore wind farm piling.  

PubMed

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

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

2014-02-01

148

An intelligent ultrasonic inspection system for flooded member detection in offshore structures.  

PubMed

An ultrasonic system for automatic underwater inspection of steel jacket offshore installation is described. It is based on the unambiguous detection of water ingress in normally sealed tubular members, thereby providing an indication of through-wall structural failure. A novel transducer design, based on a dual frequency array of 1-3 connectivity thickness drive transducers, is used to provide the required sensitivity and act also as an environmental monitor for input to an expert system, which performs automatic data analysis. Although intended primarily for operation on a remotely operated vehicle, the system may be employed satisfactorily by a driver. A series of test trials is described, and the prototype is shown to perform very well for all intended modes of operation. PMID:18263214

Hayward, G; Pearson, J; Stirling, G

1993-01-01

149

Bahrain's offshore banking center  

SciTech Connect

The economic effects of Bahrain's schemes for licensing offshore banking units (OBUs) were the immediate response of major international banks and the financial services the banking center has rendered by improving regional money and exchange markets at a time when a Middle East link was needed to service the increasing demand for oil-wealth banking services. Bahrain's leadership also created a favorable climate. Aggressive competition from banks in Kuwait and Saudi Arabia have caused some friction, but informal supervision by the Bahrain Monetary Agency (BMA) should be able to avoid serious difficulty. Bahrain's success required a banking infrastructure, a free-enterprise system, a willingness to maintain banking standards, a country small enough to benefit directly from OBU income, and a gap in nearby competing centers. 39 references, 1 figure, 5 tables. (DCK)

Gerakis, A.S.; Roncesvalles, O.

1983-01-01

150

Mobile offshore drilling units for frontier areas  

SciTech Connect

As response to the expanded Five-Year Offshore Leasing Plan a tremendous amount of construction and expansion has been underway in the offshore industry. This presentation is intended to provide a sampling of the mobile offshore drilling units which are expected to be used in frontier areas offshore Alaska.

Kelly, P.L.

1983-04-01

151

Ice interaction with offshore structures  

SciTech Connect

Oil platforms and other offshore structures being built in the arctic regions must be able to withstand icebergs, ice islands, and pack ice. This reference explain the effect ice has on offshore structures and demonstrates design and construction methods that allow such structures to survive in harsh, ice-ridden environments. It analyzes the characteristics of sea ice as well as dynamic ice forces on structures. Techniques for ice modeling and field testing facilitate the design and construction of sturdy, offshore constructions. Computer programs included.

Cammaert, A.B.; Muggeridge, D.B.

1988-01-01

152

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

E-print Network

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...

Owens, Garrett Reese 1987-

2012-11-26

153

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....

154

Release of bacteria during the purge cycles of steam-jacketed sterilizers.  

PubMed

The design of the steam-jacketed sterilizer includes an exterior air-gap fixture through which purged chamber aerosols potentially could escape into the ambient environment. Studies of the purge cycle in two sterilizer models tested the potential release of a genetically marked Enterococcus faecalis, together with Bacillus stearothermophilus spores introduced as exposed cultures. Direct plate counts, broth enrichment and polymerase chain reaction analysis were used to confirm any released organisms trapped in an all-glass impinger. From the retrieval of both bacterial strains, an estimated 10(3) organisms can be released from uncontained bacterial loads of 10(11) E. faecalis and 10(7) B. stearothermophilus, even from properly functioning autoclaves. The release of an opportunistic pathogen from sterilizer purge exhausts emphasises the importance of proper sterilizer location, ventilation, containment of heavily contaminated loads, and adequate sterilizer maintenance. PMID:10795367

Marshall, B M; Shin-Kim, H; Perlov, D; Levy, S B

1999-01-01

155

Hybrid offshore structure  

SciTech Connect

An articulated offshore structure is described for use in a body of water, the structure comprising: a substantially rigid lower section, the lower section extending upwardly from the bottom of the body of water to a pivot point located intermediate the bottom and the surface of the body of water; a compliant upper section extending upwardly from the pivot point to a position at or above the surface of the body of water; pivot means located proximate pivot point, the pivot means interposed between and connected to the lower section and upper section and adapted to permit the upper section to pivot laterally relative to the lower section; torsion means connected to the upper section and the lower section, the torsion means adapted to transmit torsional loads from the upper section to the lower section; the pivot means being positioned above the bottom of the body of water a distance of between about 10 percent and about 50 percent of the total depth of the body of water so as to substantially minimize the weight of the structure while maintaining the flexural vibration period of the structure at or below a preselected maximum flexural vibration period.

Finn, L.D.; Maus, L.D.

1986-09-09

156

Offshore Wind Energy Market Overview (Presentation)  

SciTech Connect

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.

Baring-Gould, I.

2013-07-01

157

Economic geology of offshore gas hydrate accumulations and provinces  

Microsoft Academic Search

The economic potential of well-studied offshore gas hydrate accumulations and provinces is assessed qualitatively based on consideration of geological, technological, and economic factors. Three types of gas hydrate accumulations are suggested. Structural accumulations occur where thermogenic, bacterial, or mixed gases are rapidly transported from the subsurface petroleum system to the gas hydrate stability zone along faults, mud volcanoes, and other

Alexei V Milkov; Roger Sassen

2002-01-01

158

Coupled dynamic analysis of floating offshore wind farms  

E-print Network

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...

Shim, Sangyun

2009-05-15

159

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

160

Offshore Coastal Wind Speed Gradients: issues for the design and development of large offshore windfarms  

E-print Network

Offshore Coastal Wind Speed Gradients: issues for the design and development of large offshore@globalnet.co.uk · WEB SITE: www.multi-science.co.uk #12;Offshore Coastal Wind Speed Gradients: issues for the design-situ and remote sensing data from offshore wind farms in Denmark, are used to examine both horizontal and vertical

Pryor, Sara C.

161

Maritime and offshore structure maintenance  

SciTech Connect

This volume provides the most up-to date material available on methods of keeping maritime installations operational. It also draws out the exceptionally valuable expertise that has been gained from servicing the major installations in the North Sea and elsewhere in the world. Subjects cover maintenance and repair including a detailed analysis of structural maintenance on specific structures. Papers include expertise in North Sea structures, corrosion protection of a North Sea platform, maintenance of ports overseas, East Africa, low maintenance concrete and maintenance of steel offshore structures. Guidelines are also included for the inspection and maintenance of marine facilities and offshore installations.

Not Available

1986-01-01

162

Stress-induced martensitic transformation during tensile test of full-size TF conductor jacket tube at 4.2 K  

SciTech Connect

The toroidal-field (TF) conductor jacket of International Thermonuclear Experimental Reactor (ITER) is made of modified 316LN stainless steel, which is influenced by heat treatment at approximately 650 °C for 200 h to produce Nb{sub 3}Sn superconducting materials at the final stage. Due to the high electromagnetic forces arising during magnet operation, higher mechanical properties of the jacket materials at cryogenic temperatures are required. In our work, mechanical properties of the full-size TF conductor jacket tube were investigated, which satisfied the ITER requirements. Stress-induced martensitic transformation mechanism during tensile test of the conductor jacket material at 4.2 K was characterized by means of in-situ temperature dependent XRD, vibrating sample magnetometer (VSM) and in conjunction with transmission electron microscopy (TEM). The tensile behavior related to the amount of stress-induced phase transformation at cryogenic temperature was also discussed.

Yang, H. H.; Li, S. P. [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. China and University of Chinese Academy of Sciences Beijing, 100049, P.R. (China); Wu, Z. X.; Huang, C. J.; Huang, R. J.; Li, L. F. [Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing, 100190, P.R. (China)

2014-01-27

163

Stress-induced martensitic transformation during tensile test of full-size TF conductor jacket tube at 4.2 K  

NASA Astrophysics Data System (ADS)

The toroidal-field (TF) conductor jacket of International Thermonuclear Experimental Reactor (ITER) is made of modified 316LN stainless steel, which is influenced by heat treatment at approximately 650 °C for 200 h to produce Nb3Sn superconducting materials at the final stage. Due to the high electromagnetic forces arising during magnet operation, higher mechanical properties of the jacket materials at cryogenic temperatures are required. In our work, mechanical properties of the full-size TF conductor jacket tube were investigated, which satisfied the ITER requirements. Stress-induced martensitic transformation mechanism during tensile test of the conductor jacket material at 4.2 K was characterized by means of in-situ temperature dependent XRD, vibrating sample magnetometer (VSM) and in conjunction with transmission electron microscopy (TEM). The tensile behavior related to the amount of stress-induced phase transformation at cryogenic temperature was also discussed.

Yang, H. H.; Wu, Z. X.; Huang, C. J.; Huang, R. J.; Li, S. P.; Li, L. F.

2014-01-01

164

FROM COAST TO OFFSHORE: SOME PROGRESS ON DEVELOPING MULTI-RESOURCE DESIGNS FOR GREAT LAKES MONITORING  

EPA Science Inventory

In the next generation of monitoring the condition of very large aquatic systems, we need to explore designs that integrate across multiple aquatic resource types, including coastal subsystems, nearshore, and offshore components, which together make up the total hydroscape. This ...

165

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 Hasager, Dellwik, Nielsen and Furevik, 2004, Validation of ERS-2 SAR offshore wind-speed maps in the North

166

OFFSHORE WIND FARMS Guidance note for Environmental  

E-print Network

OFFSHORE WIND FARMS Guidance note for Environmental Impact Assessment In respect of FEPA and CPA requirements Version 2 - June 2004 #12;Offshore Wind Farms: Guidance Note for Environmental Impact Assessment 2004 #12;Offshore Wind Farms: Guidance Note for Environmental Impact Assessment in Respect of FEPA

167

Offshore Wind Power Farm Environmental Impact Assessment  

E-print Network

Horns Rev Offshore Wind Power Farm Environmental Impact Assessment on Water Quality #12;Prepared with a planned 150 MW offshore wind farm at Horns Rev, an assessment was made of the effects the wind farm would for the preparation of EIA studies for offshore wind farms." Horns Rev is situated off Blåvands Huk, which is Denmark

168

Eighteenth annual offshore technology conference. Volume 1  

SciTech Connect

These sixty papers were given at a conference on offshore technology. Topics covered include friction effects of driving piles into sea beds of various compositions, wave forces on offshore platforms, stability, materials testing of various components such as plates, legs, wellheads, pipe joints, and protection of offshore platforms against ice and collision with icebergs.

Not Available

1986-01-01

169

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

SciTech Connect

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.

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

1995-12-31

170

Skin, bone and muscle collagen extraction from the trash fish, leather jacket ( Odonus niger ) and their characterization  

Microsoft Academic Search

Acid soluble (ASC) and pepsin soluble (PSC) collagens were extracted from the skin, bone and muscle of a trash fish, leather\\u000a jacket (Odonus niger) by three different extraction methods. Method I gave 46–50% yield for ASC, Method II gave 49–58% yield\\u000a for both ASC and PSC and Method III gave 64–71% yield for PSC. The addition of pepsin had increased

Nagarajan Muralidharan; Robinson Jeya Shakila; Durairaj Sukumar; G. Jeyasekaran

171

Offshore wind farm siting procedures applied offshore of Block Island, Rhode Island  

NASA Astrophysics Data System (ADS)

Since 2008, the Rhode Island Coastal Resources Management Council (CRMC) has been leading a Rhode Island Ocean Area Management Plan (RIOSAMP) in partnership with the University of Rhode Island, resulting in an extensive multidisciplinary analysis of the Rhode Island offshore environment and its suitability for siting an offshore wind farm. As part of the RIOSAMP project, a standard siting optimization approach was first developed based on a siting index defined as the ratio of costs associated with the wind farm deployment to the available wind resource. This index, combined within a marine spatial planning approach to address ecological and societal constraints, provided an initial macro-siting tool (Spaulding et al., 2010). The multiple GIS layers required in this approach and the absence of theoretical support to optimize the resulting zoning, led to an extension of the initial optimization approach into a more comprehensive macro-siting optimization tool, integrating societal and ecological constraints into the siting tool, the Wind Farm Siting Index (WIFSI) (Grilli et al, 2012). The projects led to the definition of several favorable development areas including a Renewable Energy Zone (REZ) off of Block Island, in State Waters. Deep Water Wind Inc. (DWW) plans to install and commission five 6 MW direct drive Siemens lattice jacket turbines in the REZ area, by 2014. In this thesis two major steps are accomplished to refine and expand the RIOSAMP macro-siting tool. First the macro-siting tool is expanded to include a model simulating the exclusionary zones defined by the Federal Aviation Administration (FAA) regulations. Second a micro-siting model is developed, optimizing the relative position of each turbine within a wind farm area. The micro-siting objective is to minimize, (1) the loss in power due to the loss of wind resource in the wake of the turbines (wake "effect"), and (2) the cable costs that inter-connect the turbines and connecting the farm to the land. The REZ area is chosen as test site for the algorithm, and an optimal layout for the 5 turbines is found and discussed. Similarly the FAA tool is applied to the Block Island airport demonstrating the complexity of the FAA exclusionary area, and defining the limits of the exclusionary areas. The FAA regulation model is a geometric model in which all major (FAA) regulations within RI and the RI topography are embedded. The user specifies the dimension of the proposed turbines and an airport of interest, and a map of exclusionary zones specific to the turbine height and rules applying to the airport is generated. The model is validated for the entire state of Rhode Island. The micro-siting model finds the optimum placement of each turbine for a given number of turbines within an area. It includes the aerodynamic constraints (loss in wind speed within the wake of a turbine) associated to the deployment of arrays of turbines and the cable interconnection cost. It is combined with the technical, ecological, and social constraints used in the RIOSAMP macro-siting tool to provide a comprehensive micro-siting tool. In the optimization algorithm, a simple wake model and turbine-clustering algorithm are combined with the WIFSI in an objective function; the objective function is optimized with a genetic algorithm (GA).

O'Reilly, Christopher M.

172

OrthoJacket: an active FES-hybrid orthosis for the paralysed upper extremity.  

PubMed

The loss of the grasp function in cervical spinal cord injured (SCI) patients leads to life-long dependency on caregivers and to a tremendous decrease of the quality of life. This article introduces the novel non-invasive modular hybrid neuro-orthosis OrthoJacket for the restoration of the restricted or completely lost hand and arm functions in high tetraplegic SCI individuals. The primary goal of the wearable orthosis is to improve the paralysed upper extremity function and, thus, to enhance a patient's independence in activities of daily living. The system combines the advantage of orthotics in mechanically stabilising joints together with the possibilities of functional electrical stimulation for activation of paralysed muscles. In patients with limited capacity, for force generation, flexible fluidic actuators are used to support the movement. Thus, the system is not only intended for functional restoration but also for training. Several sensor systems together with an intelligent signal processing allow for automatic adaptation to the anatomical and neurological individualities of SCI patients. The integration of novel user interfaces based on residual muscle activities and detection of movement intentions by real-time data mining methods will enable the user to autonomously control the system in a natural and cooperative way. PMID:21210758

Schill, Oliver; Wiegand, Roland; Schmitz, Bastian; Matthies, Richard; Eck, Ute; Pylatiuk, Christian; Reischl, Markus; Schulz, Stefan; Rupp, Rüdiger

2011-02-01

173

Potential threats to offshore platforms  

Microsoft Academic Search

Increasingly spectacular acts of terrorism have led to growing concern that terrorists will move beyond the symbols of society and directly attack its technological and industrial vulnerabilities. Offshore platforms have been frequently mentioned among the potential targets terrorists might attack. This concern, however, has not resulted in extensive research like that devoted to possible threats to nuclear facilities, which have

1988-01-01

174

Offshore gas compression lags behind  

Microsoft Academic Search

Potentially vast oil and gas reserves exist in deeper water, discovered but inaccessible because present production technology has only reached the halfway point. Needs for gas compression offshore are similar to onshore: to compress natural casinghead (off separator) gas to transmission line pressures, to gas-lift wells incapable of flowing into limited flexibility gathering systems, and to compress for injection into

E. C. Jr

1969-01-01

175

Harmonic filtering for offshore industry  

Microsoft Academic Search

The application of a large number of Adjustable Speed Drives (ASDs) operating Electric Submersible Pumps (ESPs) on two separate offshore platforms, connected to a limited electrical power system on a tanker feeding power to the platforms via subsea power cables, presents technical problems involving high levels of harmonic distortions that experience shows can impact the overall system reliability. Here such

S. J. Merhej; W. H. Nichols

2009-01-01

176

Foundations for offshore wind turbines.  

PubMed

An important engineering challenge of today, and a vital one for the future, is to develop and harvest alternative sources of energy. This is a firm priority in the UK, with the government setting a target of 10% of electricity from renewable sources by 2010. A component central to this commitment will be to harvest electrical power from the vast energy reserves offshore, through wind turbines or current or wave power generators. The most mature of these technologies is that of wind, as much technology transfer can be gained from onshore experience. Onshore wind farms, although supplying 'green energy', tend to provoke some objections on aesthetic grounds. These objections can be countered by locating the turbines offshore, where it will also be possible to install larger capacity turbines, thus maximizing the potential of each wind farm location. This paper explores some civil-engineering problems encountered for offshore wind turbines. A critical component is the connection of the structure to the ground, and in particular how the load applied to the structure is transferred safely to the surrounding soil. We review previous work on the design of offshore foundations, and then present some simple design calculations for sizing foundations and structures appropriate to the wind-turbine problem. We examine the deficiencies in the current design approaches, and the research currently under way to overcome these deficiencies. Designs must be improved so that these alternative energy sources can compete economically with traditional energy suppliers. PMID:14667305

Byrne, B W; Houlsby, G T

2003-12-15

177

National Offshore Wind Energy Grid Interconnection Study  

SciTech Connect

The National Offshore Wind Energy Grid Interconnection Study (NOWEGIS) considers the availability and potential impacts of interconnecting large amounts of offshore wind energy into the transmission system of the lower 48 contiguous United States. A total of 54GW of offshore wind was assumed to be the target for the analyses conducted. A variety of issues are considered including: the anticipated staging of offshore wind; the offshore wind resource availability; offshore wind energy power production profiles; offshore wind variability; present and potential technologies for collection and delivery of offshore wind energy to the onshore grid; potential impacts to existing utility systems most likely to receive large amounts of offshore wind; and regulatory influences on offshore wind development. The technologies considered the reliability of various high-voltage ac (HVAC) and high-voltage dc (HVDC) technology options and configurations. The utility system impacts of GW-scale integration of offshore wind are considered from an operational steady-state perspective and from a regional and national production cost perspective.

Daniel, John P. [ABB Inc; Liu, Shu [ABB Inc; Ibanez, Eduardo [National Renewable Energy Laboratory; Pennock, Ken [AWS Truepower; Reed, Greg [University of Pittsburgh; Hanes, Spencer [Duke Energy

2014-07-30

178

Offshore petroleum security: Analysis of offshore security threats, target attractiveness, and the international legal framework for the protection and security of offshore petroleum installations.  

E-print Network

??The offshore petroleum industry is of critical importance to the global economy. Offshore petroleum installations are considered elements of critical national infrastructure in many nation-States… (more)

Kashubsky, Mikhail

2011-01-01

179

Fatigue handbook: Offshore steel structures  

SciTech Connect

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.

Almarnaess, A.

1985-01-01

180

Pipelaying in artic offshore waters  

SciTech Connect

The present invention provides a method and apparatus for constructing pipelines in Arctic offshore waters by a directional drilling technique, thereby minimizing exposure to ice gouging and eliminating the hazards associated with unstable permafrost. A special drilling-pipe-line construction vessel is also provided which has a conical shape with reinforced outer walls to resist ice forces, which vessel includes means to install deep underground pipeline segments and means to connect and protect the pipe ends.

Langner, C. G.

1985-11-19

181

Offshore platform structure for artic waters  

SciTech Connect

An offshore platform structure of the gravity type intended to be installed on a sea bed in artic or corresponding waters. The platform structure comprises a substructure intended to be completely submerged and supported by the sea bed when in installed position, a superstructure extending up from the substructure and up above the sea bed and a deck superstructure supported by the superstructure above the sea level. A fender is provided intended to protect the superstructure against drifting ice and icebergs, the substructure being provided with a preferably horizontal top support slab supporting the fender, the fender being movably arranged on said support slab and comprising a preferably compartmented cylindrical ring-shaped body with a large weight resting preferably freely on the substructure, intended to be arranged apart from the superstructure when in normal position.

Einstabland, T.

1984-11-27

182

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

PubMed Central

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

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

2014-01-01

183

Numerical experiments in ringing of offshore systems under viscous loads  

SciTech Connect

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.

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

1996-12-31

184

1991 worldwide offshore contractors and equipment directory  

SciTech Connect

This book is the information source-book for the international offshore oil industry. Within this single convenient reference you'll find addresses, phone numbers, telex, fax and cable listings for more than 3,500 companies and their key personnel in the drilling, workover, construction, service/supply/manufacturers, geophysical, diving and transportation segments of the offshore industry. Along with this vital contact information, the authors include such pertinent data as rig specifications, ownership, an equipment index, a company index and a current survey of offshore production systems from Offshore Incorporating the Oilman.

Not Available

1991-01-01

185

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

186

Baltimore Canyon Trough Mesozoic Carbonate Margin Cores, Offshore USA Atlantic  

Microsoft Academic Search

In 1984 three wells operated by Shell tested various types of Jurassic-Cretaceous carbonate shelf and margin plays in deep water offshore New Jersey. Eleven cores were recovered: OCS-A 0336 cores R1-4, OCS-A 0337 cores C1-3 and OCS-A 0317 cores H1-4. Representative core intervals on display are keyed to seismic morphology and show litho- biofacies from three geometrically and stratigraphically separate

Leslie S. Eliuk

187

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

E-print Network

exploration, drilling and related maintenance tasks. Hercules Offshore operates in key oil producing sitesAbout 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

Fisher, Kathleen

188

What can wave energy learn from offshore oil and gas?  

PubMed

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

Jefferys, E R

2012-01-28

189

76 FR 11503 - National Offshore Safety Advisory Committee; Vacancies  

Federal Register 2010, 2011, 2012, 2013

...safety and training related to offshore exploration and construction...representing enterprises specializing in offshore drilling. To be eligible, applicants for...exploration for and the recovery of offshore mineral resources....

2011-03-02

190

78 FR 18618 - National Offshore Safety Advisory Committee; Vacancies  

Federal Register 2010, 2011, 2012, 2013

...in support of the exploration of offshore mineral and energy resources insofar...or similar entities engaged in offshore drilling; (c) One member representing...entities engaged in the support, by offshore supply vessels or other...

2013-03-27

191

76 FR 62817 - National Offshore Safety Advisory Committee  

Federal Register 2010, 2011, 2012, 2013

...support of the exploration of offshore mineral and energy resources...operate large OSVs. (6) Offshore Operators Committee (OOC...Team for DEEPWATER HORIZON drilling rig explosion and sinking...connection with the development of offshore renewable energy on the...

2011-10-11

192

78 FR 63233 - National Offshore Safety Advisory Committee; Meeting  

Federal Register 2010, 2011, 2012, 2013

...Foreign Flag Mobile Offshore Drilling Units. (4) Safety...Foreign Flag Mobile Offshore Drilling Units (MODUs...International Association of Drilling Contractors discussion...International and National offshore oil exploration...

2013-10-23

193

46 CFR 15.520 - Mobile offshore drilling units.  

Code of Federal Regulations, 2011 CFR

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

2011-10-01

194

46 CFR 15.520 - Mobile offshore drilling units.  

Code of Federal Regulations, 2013 CFR

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

2013-10-01

195

77 FR 26562 - Mobile Offshore Drilling Unit Dynamic Positioning Guidance  

Federal Register 2010, 2011, 2012, 2013

...USCG-2011-1106] Mobile Offshore Drilling Unit Dynamic Positioning Guidance...emergency procedures on a Mobile Offshore Drilling Unit. We received comments...particularly true for Mobile Offshore Drilling Units (MODUs), where a...

2012-05-04

196

46 CFR 15.520 - Mobile offshore drilling units.  

Code of Federal Regulations, 2010 CFR

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

2010-10-01

197

78 FR 18614 - National Offshore Safety Advisory Committee  

Federal Register 2010, 2011, 2012, 2013

...in support of the exploration of offshore mineral and energy resources insofar...Hazardous Areas on Foreign Flag Mobile Offshore Drilling Units (MODUs); (c) Safety...Register notices that affect the offshore industry; (4) USCG Outer...

2013-03-27

198

76 FR 39410 - National Offshore Safety Advisory Committee; Vacancies  

Federal Register 2010, 2011, 2012, 2013

...have recent practical experience on vessels or offshore units involved in the offshore mineral and energy industry; (d) One member representing enterprises specializing in offshore drilling; and, (e) One member representing...

2011-07-06

199

46 CFR 15.520 - Mobile offshore drilling units.  

Code of Federal Regulations, 2012 CFR

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

2012-10-01

200

77 FR 17491 - National Offshore Safety Advisory Committee  

Federal Register 2010, 2011, 2012, 2013

...and Federal Register notices that affect the offshore industry. (7) Offshore Operators Committee (OOC) update regarding...the industry comments received from the Mobile Offshore Drilling Unit Guidance Policy, Notice of...

2012-03-26

201

47 CFR 22.1007 - Channels for offshore radiotelephone systems.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 2013-10-01 false Channels for offshore radiotelephone systems...Offshore Radiotelephone Service § 22.1007 Channels for offshore radiotelephone systems. The channels listed in this section are...

2013-10-01

202

47 CFR 22.1007 - Channels for offshore radiotelephone systems.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 2012-10-01 false Channels for offshore radiotelephone systems...Offshore Radiotelephone Service § 22.1007 Channels for offshore radiotelephone systems. The channels listed in this section are...

2012-10-01

203

Design and use of a protective jacket to prevent self-inflicted injury following cervical laminoplasty in the goat (Capra hircus).  

PubMed

A group of dairy goats underwent cervical laminoplasty procedures as part of a biomechanics project. Although most animals had minimal incisional complications, several developed excoriations exacerbated by scratching at the incision site 6 to 8 weeks after the surgery. Local and systemic treatment was instituted as indicated. Bandages were inadequate to protect the neck from self-trauma, and the potential existed for serious injury to or infection of the old surgical site. We designed and made custom padded jackets for these animals. Treatment continued. While allowing the animals to exercise their scratching behavior, the jackets protected the traumatized area until healing was complete and the pruritus resolved. This jacket or modifications of it may be useful in other goat, sheep, or calf projects in which protection of the neck, shoulders, and thorax is needed. PMID:11300688

Eisele, P H; Allen, C E

2001-03-01

204

Offshore drilling and production structure  

SciTech Connect

The invention relates to an off-shore marine structure that provides an elevated support for a drilling and/or production platform. A structure comprised of three interlocking components is provided, the first component being a large foundation base installed on the sea bed; the second being a conical shaped support component which is engagable with the foundation base and which, releasably carries the third platform supporting component. In the preferred form, the platform supporting component comprises a centrally-disposed vertical column, means being provided to facilitate engagement of the column with the platform and the second component and to subsequently elevate the platform to an operating height above sea level.

Crockett, R.K.; Palmer, H.E.; Stenning, D.G.

1982-02-09

205

44 MArch 2006 Can offshore aquaculture  

E-print Network

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

Miami, University of

206

Powering the World: Offshore Oil & Gas Production  

E-print Network

Powering the World: Offshore Oil & Gas Production Macondo post-blowout operations Tad Patzek;Talk Outline. . . Fuels that run the U.S. and world Drilling and fracturing primer Complexity and risks, not resources or energy potentially available Offshore fields will be producing an increasing portion of global

Patzek, Tadeusz W.

207

CONMOW: Condition Monitoring for Offshore Wind Farms  

E-print Network

1 CONMOW: Condition Monitoring for Offshore Wind Farms Edwin Wiggelinkhuizen, Theo Verbruggen, Henk in practice the European project CONMOW (Condition Monitoring for Offshore Wind Farms) was started in November 2002. A small wind farm of five turbines has been instrumented with several condition monitoring

208

Corrosion control survey methods for offshore pipelines  

Microsoft Academic Search

Construction, operation, and maintenance of offshore pipelines and other facilities are expensive. The consequences of an offshore corrosion failure can be devastating. For these reasons, cathodic protection (CP) has become a universally applied technique for mitigating corrosion. Marine pipelines are typically provided with CP by bracelet anodes of zinc or aluminum. Impressed current systems at platforms or onshore are also

C. P. Weldon; D. Kroon

1992-01-01

209

Underbalanced drilling benefits now available offshore  

SciTech Connect

Offshore underbalanced drilling (UBD) is a reality. Applications in older, partially depleted fields and new fields are being considered. However, low productivity reservoirs and fields with sub normal pressures causing drilling problems are currently the main targets for offshore UBD. With proper planning and the correct technique, both jointed pipe and coiled tubing UBD drilling operations have been carried out offshore with success. The main concerns for offshore UBD have been altered drilling practices and surface production system operation. These issues have been examined and equipment has been designed and tested to address them. Environmental, safety and health issues are paramount and have been studied carefully. Detailed well planning, engineering, and flow modeling have proven critical for successful offshore UBD operations. Examples are given from oil and gas fields.

Vozniak, J.P.; Cuthbertson, B.; Nessa, D.O.

1997-05-01

210

Offshore propagation of coastal precipitation  

NASA Astrophysics Data System (ADS)

This work focuses on the seaward propagation of coastal precipitation with or without mountainous terrain nearby. Offshore of India, diurnal propagation of precipitation is observed in the Bay of Bengal. On the eastern side of the Bay a diurnal but non-propagating signal is observed near the west coast of Burma. This asymmetry suggests that the propagating mechanism is inertio-gravity waves. Perturbations generated by the diurnal heating over the coastal mountains of India propagate offshore, amplify in the upwind direction and dissipate in the downwind direction owing to critical level consideration. A linear model is applied to study these gravity waves. Analytical analysis is performed for various heating depths, mountain widths, stability, Coriolis effect, background mean wind, and friction. We assess how these affect the amplitude, dissipation, initiation phase, and propagation speed of the diurnal disturbance. The propagation of precipitation triggered by land/sea breeze, are distinguishable from a mountain-plain circulation. For mountain breeze, convection from mountain heating starts earlier; propagates slower; and damps faster than that of the land breeze. For mountains near the coast, the slower propagation and stronger earlier convection are due to the combination of two dynamical mechanisms. The propagation of precipitation is initially triggered by mountain breeze near the coastal mountain. Over the open ocean, the dominant signal propagates as that of the land breeze but with stronger convection.

Li, Yanping; Carbone, Rit

2013-04-01

211

Ice island creation, drift, recurrences, mechanical properties, and interactions with arctic offshore oil production structures  

SciTech Connect

Research and engineering studies on first-year sea ice for over two decades has resulted in the design, construction, and operation of jacket platforms, of artificial islands, and of massive gravity structures which routinely withstand moving sea ice of thickness up to 2 meters. However, the less-common interactions between such structures and moving multiyear ice ([ge]3 meters thick), and also moving ice islands (10 to 60 meters thick) remain as the unknown and potentially most serious hazard for Arctic offshore structures. In this study, research was addressed across the complete span of remaining questions regarding such features. Ice island components, thickness distributions, scenarios and models for the interactions of massive ice features with offshore structures, all were considered. Ice island morphology and calving studies were directed at the cluster of 19 ice islands produced in a calving from the Ward Hunt Ice Shelf on Ellesmere Island in 1983, and also at a calving from the Milne Ice Shelf in 1988. The statistics of ice island dynamics, on both a short-term small-scale basis and also on a long-term basis, were studied. Typical wind velocities of 5 to 7.5 meters per second led to ice island speeds of about 0.014 of the wind speed, at an angle of 20[degrees] to the right of the wind direction. Ice island samples were tested for their stress/strain characteristics. Compressive strength values ranged from 1.64 MPa at a strain rate of 2 [times] 10[sup [minus]7] s[sup [minus]1] to 6.75 MPa at a strain rate of 1 [times] 10[sup [minus]3] s[sup [minus]1]. Scenarios for ice island/structure interactions were developed, and protective countermeasures such as spray ice and ice rubble barriers were suggested. Additional computer modeling of structure/ice interactions for massive ice features is recommended.

Sackinger, W.M.; Jeffries, M.O.; Li, Fucheng; Lu, Mingchi.

1991-03-01

212

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

SciTech Connect

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.

Damiani, R.

2014-03-01

213

Comparison of different approaches to load calculation for the OWEC Quattropod jacket support structure  

NASA Astrophysics Data System (ADS)

Accurate load simulations are necessary in order to design cost-efficient support structures for offshore wind turbines. Due to software limitations and confidentiality issues, support structures are often designed with sequential analyses, where simplified wind turbine and support structure models replace more detailed models. The differences with an integrated analysis are studied here for a commercial OWEC Quattropod. Integrated analysis seems to generally predict less damage than sequential analysis, decreasing by 30-70 percent in two power production cases with small waves. Additionally it was found that using a different realization of the wave forces for the retrieval run in sequential analysis leads to an increase of predicted damage, which can be explained as the effect of applying two independent wave force series at the same time. The midsection of the detailed support structure model used shell elements. Additional analyses for a model with an equivalent beam model of the midsection showed only small differences, mostly overpredicting damage by a few percent. Such models can therefore be used for relatively accurate analysis, if carefully calibrated.

Zwick, D.; Schafhirt, S.; Brommundt, M.; Muskulus, M.; S, Narasimhan; Mechineau, J.; Haugsøen, P. B.

2014-12-01

214

Decommissioning of offshore oil and gas facilities: a comparative assessment of different scenarios.  

PubMed

A material and energy flow analysis, with corresponding financial flows, was carried out for different decommissioning scenarios for the different elements of an offshore oil and gas structure. A comparative assessment was made of the non-financial (especially environmental) outcomes of the different scenarios, with the reference scenario being to leave all structures in situ, while other scenarios envisaged leaving them on the seabed or removing them to shore for recycling and disposal. The costs of each scenario, when compared with the reference scenario, give an implicit valuation of the non-financial outcomes (e.g. environmental improvements), should that scenario be adopted by society. The paper concludes that it is not clear that the removal of the topsides and jackets of large steel structures to shore, as currently required by regulations, is environmentally justified; that concrete structures should certainly be left in place; and that leaving footings, cuttings and pipelines in place, with subsequent monitoring, would also be justified unless very large values were placed by society on a clear seabed and trawling access. PMID:16373078

Ekins, Paul; Vanner, Robin; Firebrace, James

2006-06-01

215

Quantifying the benefits of a slender, high tip speed blade for large offshore wind turbiness  

NASA Astrophysics Data System (ADS)

An in-depth study has been completed to study the effects of slender, flexible blades in combination with high rotor speed operation on load mitigation, targeted at cost reductions of the structural components of large wind turbines, consequently lowering the levelized cost of energy. An overview of existing theory of sensitivity of turbine fatigue loading to the blade chord and rotor speed was created, and this was supplemented by a proposed theory for aboverated operation including the pitch controller. A baseline jacket-supported offshore turbine (7 MW) was defined, of which the blade was then redesigned to be more slender and flexible, at the same time increasing rotor speed. The blade redesign and optimisation process was guided by cost of energy assessments using a reduced loadset. Thereafter, a full loadset conform IEC61400-3 was calculated for both turbines. The expected support structure load reductions were affirmed, and it was shown that reductions of up to 18.5% are possible for critical load components. Cost modelling indicated that turbine and support structure CapEx could be reduced by 6%. Despite an energy production reduction of 0.44% related to the thicker airfoils used, the blade redesign led to a reduction in Cost of Energy.

Blonk, Lindert; Rainey, Patrick; Langston, David A. J.; Vanni, Francesco

2014-06-01

216

Electrokinetic improvement of offshore foundations  

NASA Astrophysics Data System (ADS)

Offshore and near-shore structures for energy exploration and production, harbour work and other facilities are often situated on very soft marine clay deposits that have shear strengths of a few kilopascals. The design of foundations embedded in these soft deposits often poses a challenge for geotechnical engineers, i.e., to satisfy the bearing capacity requirement, while at the same time minimizing the embedment depth and dimensions of the foundation due to cost considerations. The present study investigates the possibility of using electrokinetics to strengthen the soil adjacent to skirted foundations embedded in soft marine deposits and, thus, to improve the load carrying capacity of the foundations. The innovative feature of this approach as compared to soil improvement methods commonly adopted in practice is that the focus of strengthening is on the interface between the soil and embedded foundation, in terms of enhancement of adhesion and cementation. The thesis presents a summary of the method and results of a series of electrokinetic tests conducted on natural and simulated marine clays in small-scale and large-scale laboratory testing facilities. Steel plates and steel cylinders are used to simulate skirted foundations. A low dc voltage is applied via steel electrodes installed around the foundation models. The effects of electrokinetics are evaluated through changes in the geotechnical properties of the soil and load carrying capacities of the foundation model after treatment. The results demonstrate that the load carrying capacity of the skirted foundation model and the undrained shear strength of the adjacent soil increase by a factor of three after electrokinetic treatment. The clay adheres strongly to the inside and outside walls of the foundation model, indicating bonding occurs between the soil and steel after treatment. The treatment increases the soil undrained modulus and also induces a preconsolidation pressure of the remoulded clay, thereby reducing potential settlement of the foundation. The new technology described in this thesis has potential application in offshore engineering for increasing the load carrying capacity of skirted foundations installed in soft clayey sediments, as well as for rehabilitation of existing offshore structures.

Micic, Silvana

217

Offshore drilling, construction: Fortunes tied to stable gas prices  

Microsoft Academic Search

Significantly improved US natural gas prices fueled an upswing in offshore drilling in the Gulf of Mexico in late 1992. Stabilized gas prices will be necessary to support both the off-shore drilling and construction markets in 1993 and beyond. The article discusses both these segments in detail: offshore drilling and offshore construction.

S. S. Pagano; T. Marsh

1993-01-01

218

An Economic Evaluation Method of Offshore Drilling Platform Overhaul Projects  

Microsoft Academic Search

The stable and efficient operation of offshore drilling platform is the prerequisite that enable success of offshore petroleum exploration and development activities. Offshore drilling platforms are often required periodical overhaul to restore its operational capacity after long time use in the marine environment. However, not all offshore drilling platform overhaul projects are economically feasible. In order to determine the economic

Luo Dong-kun; Dai You-jin

2009-01-01

219

Riser and wellhead monitoring for improved offshore drilling operations  

E-print Network

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 · Two systems delivered. #12;Offshore drilling with riser ...a quick introduction #12;Offshore drilling

Nørvåg, Kjetil

220

OFFSHORE WIND FARM LAYOUT OPTIMIZATION (OWFLO) PROJECT: AN INTRODUCTION  

E-print Network

OFFSHORE WIND FARM LAYOUT OPTIMIZATION (OWFLO) PROJECT: AN INTRODUCTION C. N. Elkinton* , J. F focused on land-based wind farms, rather than on offshore farms. The conventional method used to lay out that distinguish offshore wind farms from their onshore counterparts, the Offshore Wind Farm Layout Optimization

Massachusetts at Amherst, University of

221

Offshore Series Wind Turbine Variable Hub heights & rotor diameters  

E-print Network

3.6MW Offshore Series Wind Turbine GE Energy #12;Feature Variable Hub heights & rotor diameters-savings feature, considering the rigors of offshore power generation. The 3.6 MW offshore wind turbine also, for both on and offshore use. Special features include... As the world's first commercially available wind

Firestone, Jeremy

222

ORIGINAL PAPER Review of Methodologies for Offshore Wind Resource  

E-print Network

ORIGINAL PAPER Review of Methodologies for Offshore Wind Resource Assessment in European Seas A. M installation, operation and maintenance costs associated with offshore wind parks. Successful offshore wind. Keywords Wind energy Á Offshore Á Resources assessment Á European seas Á Wind mapping Á Wind climatology Á

Pryor, Sara C.

223

Quantifying the hurricane risk to offshore wind turbines  

E-print Network

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

Jaramillo, Paulina

224

Certification of offshore mooring steel wire ropes  

SciTech Connect

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.

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

1996-12-31

225

Offshore drilling to increase in 1984  

SciTech Connect

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.

Not Available

1984-05-01

226

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

SciTech Connect

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.

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

2014-12-01

227

Integrated natural-gas-engine cooling jacket vapor-compressor program. Annual progress report (phase 2), January-December 1987  

SciTech Connect

A unique, alternative cogeneration system was designed that will provide an industrial or commercial energy user with high-pressure steam and electricity directly from a packaged cogeneration system. The Integrated Gas Engine Vapor Compression System concept includes an engine-generator set and a steam screw compressor that are mechanically integrated with the engine. The gas-fueled engine is ebulliently cooled, thus allowing its water jacket heat to be recovered in the form of low-pressure steam. This steam is then compressed by the steam compressor to a higher pressure, and when combined with the high-pressure steam generated in the engine's exhaust gas boiler it provides the end user with a more useable thermal energy source. Phase 1B of this project was completed in 1986 and consisted primarily of the procurement of equipment and the final design and assembly of a prototype integrated gas-engine vapor-compression system.

DiBella, F.A.; Becker, F.

1988-01-01

228

Engineering Challenges for Floating Offshore Wind Turbines  

SciTech Connect

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.

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

2007-09-01

229

EMS offshore. A new horizon for paramedics.  

PubMed

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

Mallard, A S

1991-10-01

230

Visualization of vibration experienced in offshore platforms  

E-print Network

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 ...

Patrikalakis, Alexander Marinos Charles

2010-01-01

231

Offshore oil in the Alaskan Arctic  

NASA Technical Reports Server (NTRS)

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.

Weeks, W. F.; Weller, G.

1984-01-01

232

Future characteristics of Offshore Support Vessels  

E-print Network

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 ...

Rose, Robin Sebastian Koske

2011-01-01

233

Outsourcing, offshoring and the US office market  

E-print Network

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 ...

Topolewski, Tanya M., 1969-

2004-01-01

234

31 CFR 595.407 - Offshore transactions.  

Code of Federal Regulations, 2013 CFR

... 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 §...

2013-07-01

235

Psychosocial burden among offshore drilling platform employees.  

PubMed

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

Leszczy?ska, Irena; Je?ewska, Maria

2010-01-01

236

Slow motion responses of compliant offshore structures  

E-print Network

SLOW MOTION RESPONSES OF COMPLIANT OFFSHORE STRUCTURES A Thesis by PEIMIN CAO Submitted to the Office of Gradnate Stndies of Texas AM'I University in partial fnliillment of the requirements for the degree of hiIASTER OF SCIENCE December... 1996 Major Subject: Ocean Engineering SLOW MOTION RESPONSES OF COMPLIANT OFFSHORE STRUCTURES A Thesis by PEIMIN CAO Submitted to Texas AEcM University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved...

Cao, Peimin

2012-06-07

237

Norwegian Offshore Stratigraphic Lexicon (NORLEX)  

NASA Astrophysics Data System (ADS)

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.

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

2010-05-01

238

Marginal field (early production): options for offshore loading  

SciTech Connect

This work describes some of the various schemes that have been utilized since the early 1970s and which are available now for direct tanker loading from offshore oil fields to allow economic production from marginal fields and/or to allow revenues to be obtained at an earlier date than would be possible using conventional development. Particular emphasis is given to the types of single point mooring systems that have been accepted by the oil industry as viable elements in the overall production scheme.

Gruy, R.H.; Kiely, W.L.

1983-01-01

239

Economics, new technology improve Danish offshore oil recovery  

SciTech Connect

Cost-efficient development concepts and technologies, such as horizontal wells and water injection, have almost tripled the expected ultimate oil recovery from Danish offshore fields. All currently produced Danish oil and gas is from chalk reservoirs. The Danish Energy Agency`s strategies for research and development of improved recovery techniques is related to classifying Danish calk fields into three different reservoir types according to flow characteristics and initial oil saturation. This paper reviews these classification techniques and the methods of extraction for each.

Mortensgaard, A. [Danish Energy Agency, Copenhagen (Denmark)

1996-06-10

240

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

241

Life Jacket Wear / Wearing Your Life Jacket  

MedlinePLUS

... II 7 lb. 12 lb. RESOURCES Media and Marketing Materials Members of the press, boating safety specialists ... utilize any and all of the media and marketing materials in this section. Photo Library The U.S. ...

242

Life Jacket Wear / Wearing Your Life Jacket  

MedlinePLUS

... and marketing materials in this section. Search Photo Library The U.S. Coast Guard has provided the Image ... specialists, advocates and the general public. Search Video Library The U.S. Coast Guard has provided the Video ...

243

Lake Michigan Offshore Wind Feasibility Assessment  

SciTech Connect

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

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

244

The Seabed Stability Zonation in Chinese Offshore  

NASA Astrophysics Data System (ADS)

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.

Du, J.

2013-12-01

245

Offshore oil gas trends in ROVs tooling  

SciTech Connect

The ROVs that operate in today's offshore environment bear little or no resemblance to those which first began supporting the oil and gas work requirements less than 15 years ago. In that short span of time, an explosion of subsea technology has occurred, rendering older equipment obsolete and expanding subsea remote intervention capabilities beyond the horizon of intervention tasks originally envisioned. Today's offshore work ROVs employ the latest in robotics, fiver optics, acoustics, video, and computer technologies, and routinely achieve better than 90 percent operational availability. Leading offshore ROV operations companies have demonstrated less than 1 percent down-time over thousands of hours of operation. As the offshore oil and gas market evolves, the ever-expanding capabilities of the work ROV plays a major role in shaping the operational concepts employed in subsea oil and gas field exploration, development, and production. This paper explores the capabilities of available ROV systems in use offshore today, the economic trends driving ROV technology development, and the new trends in the employment of ROVs and their associated sensors and tooling systems.

Jacobson, J.R. (Perry Tritech Inc., Jupiter, FL (United States))

1994-04-01

246

Offshore wind resource mapping using satellite observations  

NASA Astrophysics Data System (ADS)

Offshore wind mapping using satellite observations has been developed in the last decade. The archives of scatterometer and SAR images useful for ocean wind mapping contain data from around 8 to 15 years. For the statistical analysis it is important to include high numbers of observations. For scatterometer the wind resource analysis can be done based on around 6.500 individual readings, i.e. two observations daily since July 1999. Comparison results between meteorological observations at the Horns Rev offshore wind farm has been shown to compare well with QuikSCAT winds. Also SAR-based wind mapping has been compared to the same observations with good results. At present new analysis using more observations, available through the ESA EO Scandia-SAR project, show new maps of offshore winds in the North Sea and Baltic Sea. During year 2009 the first analysis for the new EU-Norsewind project (2008-2012) will be conducted. This project aims to map wind resource for a large offshore region in Northern Europe based on satellite, lidar and masts offshore.

Hasager, C. B.; Badger, M.

2009-04-01

247

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

USGS Publications Warehouse

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.

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

2011-01-01

248

The challenge and prevention of epidemics: experience from offshore petroleum installations and its extrapolation to ships.  

PubMed

The risk of epidemics represents an important challenge in offshore petroleum activities. All personnel are needed for regular operations, and the outbreak of an epidemic will soon affect the operations. The economical consequences can be vast. The risk of an epidemic is raised due to the closeness of living and catering offshore combined with frequent changes of personnel who travel offshore from many nations. The article is based on the experience gained by the author during 22 years as a senior medical officer in a Norwegian oil company. Some endemics and epidemics are described. None of these resulted in the shutdown of production, but they still represented a major challenge to the company and to the medical staff in particular. The transfer value from experience offshore to ships is obvious but there are differences. Risk analysis and quality assurance systems play an important part in the prevention and limitation of epidemics offshore. The infrastructure of the food supply chain as well as education and training of personnel are key elements. Campaigns on different hygiene topics that address all personnel are launched at regular intervals. Contingency plans must be established and be ready for use in case of a threatening epidemic. Identification of the type and source of the infection or food poisoning, isolation of the infected personnel, safe evacuation of patients, and the establishment of other necessary barriers for reduction of spread of infection are necessary to control an outbreak of an epidemic. PMID:22544502

Ulven, Arne Johan

2011-01-01

249

Gas-dynamic characteristics of a noise and heat insulating jacket on a gas turbine in a gas pumping plant on emergency disconnection of the cooling fans  

Microsoft Academic Search

The paper discusses the operation of a gas turbine plant (GTP) when the fans in the cooling system are switched off. The GTP\\u000a is located in a noise and heat isolating jacket (NHJ) and the cooling is provided by atmospheric air supplied to the NHJ by\\u000a a fan. The operation of gas-pumping plant involves working with brief (10–30 sec) switching

P. V. Trusov; D. A. Charntsev; I. R. Kats; V. V. Mokshanov; A. M. Pechenkina

2008-01-01

250

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

SciTech Connect

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.

Francois, D.K.

1994-12-31

251

Numerical Study Of The Effects Of Preloading, Axial Loading And Concrete Shrinkage On Reinforced Concrete Elements Strengthened By Concrete Layers And Jackets  

SciTech Connect

In this study, the technique of seismic strengthening existing reinforced concrete columns and beams using additional concrete layers and jackets is examined. The finite element method and the finite element program ATENA is used in this investigation. When a reinforced jacket or layer is being constructed around a column it is already preloaded due to existing service loads. This effect has been examined for different values of the axial load normalized to the strengthened column. The techniques of strengthening with a concrete jacket or a reinforced concrete layer on the compressive side of the column are examined. Another phenomenon that is examined in this study is the shrinkage of the new concrete of an additional layer used to strengthen an existing member. For this investigation, a simply supported beam with an additional reinforced concrete layer on the tensile side is examined. The results demonstrate that the effect of preloading is important when a reinforced concrete layer is being used with shear connectors between the old and the new reinforcement. It was also found that the shrinkage of the new concrete reduces the strength of the strengthened beam and induces an initial sliding between the old and the new concrete.

Lampropoulos, A. P. [Civil Engineer, M.Sc., Department of Civil Engineering, University of Patras, Patras (Greece); Dritsos, S. E. [Professor, Department of Civil Engineering, University of Patras, 26500, Patras (Greece)

2008-07-08

252

Investigation on installation of offshore wind turbines  

NASA Astrophysics Data System (ADS)

Wind power has made rapid progress and should gain significance as an energy resource, given growing interest in renewable energy and clean energy. Offshore wind energy resources have attracted significant attention, as, compared with land-based wind energy resources, offshore wind energy resources are more promising candidates for development. Sea winds are generally stronger and more reliable and with improvements in technology, the sea has become a hot spot for new designs and installation methods for wind turbines. In the present paper, based on experience building offshore wind farms, recommended foundation styles have been examined. Furthermore, wave effects have been investigated. The split installation and overall installation have been illustrated. Methods appropriate when installing a small number of turbines as well as those useful when installing large numbers of turbines were analyzed. This investigation of installation methods for wind turbines should provide practical technical guidance for their installation.

Wang, Wei; Bai, Yong

2010-06-01

253

Integrated natural-gas-engine cooling-jacket vapor-compressor program. Final report, February 1985-August 1990  

SciTech Connect

A unique, alternative cogeneration system has been designed that will provide an industrial or commercial energy user with high-pressure steam and electricity directly from a packaged cogeneration system. The Integrated Gas Engine Vapor Compression System concept includes an engine-generator set and a twin screw compressor that are mechanically integrated with the engine. The gas-fueled engine is ebulliently cooled, thus allowing its water jacket heat to be recovered in the form of low-pressure steam. The steam is then compressed by the steam compressor to a higher pressure, and when combined with the high-pressure steam generated in the engine's exhaust gas boiler, it provides the end user with a more usable thermal energy source. Phase 1B of the project was completed in 1986 and consisted primarily of the procurement of equipment and the final design and assembly of a prototype integrated gas engine vapor compression system. The project continued with Phase 2, which comprised the actual laboratory testing of the prototype system, as well as the study of several pertinent subtasks that were identified to GRI as supportive of the primary project objective. Phase 2 also included the selection of a field site, site engineering, and the final installation, start-up, and acceptance testing of the system.

DiBella, F.A.

1990-08-01

254

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

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

2014-10-01

255

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

256

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

E-print Network

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

Ruzzante, Daniel E.

257

Plastic Limit Analysis of Offshore Foundation and Anchor  

E-print Network

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 platforms. In deep waters...

Chi, Chao-Ming

2010-10-12

258

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

SciTech Connect

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.

Not Available

2012-02-01

259

Exploration potential of offshore northern California basins  

SciTech Connect

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.

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

1988-01-01

260

Marine gravity measurments offshore Sumatra  

NASA Astrophysics Data System (ADS)

Gravimetric measurements were carried out offshore Sumatra and Western Java by BGR during several expeditions with R.V. SONNE in 2005/2006 (cruises SO-186 and SO-189) and 1998/1999 (cruises SO-137 and SO-138). Gravity data were collected along profiles with a total length of nearly 33000 kilometers covering the area between Aceh in the north and the Sunda Strait in the south. The oceanic crust is characterized by slightly positive free-air gravity anomalies resulting from the influence of the subduction bulge due to the downgoing lithosphere. Additionally, there are N-S striking gravity anomalies on the oceanic crust, which can be correlated with a series of transform faults. Landward, an about 50 km wide negative anomaly runs from NW to SE, whereby the gravity values increase from about -160 mGal to about -40 mGal. They reflect the Sunda trench with water depths of 6500 m off the Sunda Strait decreasing to 4000 m off Aceh. This suggests that the thickness of the trench fill with sediments increases considerably from South to North. Landward, the gravity anomalies increase and reach a zone of relative maxima from +60 to +160 mGal in the outer arc high. This zone is about 120 km wide, whereby the outer arc high is less pronounced in the South than in the North. North of 2°N the outer arc high moves very close to the trench, reaching its maximum values already in the slope area. This indicates the recent accretion of large volumes of sediments. Further to the NE an elongated negative anomaly follows with values even lower than the minima associated with the trench. It corresponds to forearc basins filled with light sediments of up to 7 km thickness. Around the equator no basin has been developed. The EW striking gravity high in this area shows an obvious geographical correlation between with high free-air gravity associated with the Investigator Fracture Zone on the oceanic plate to the South. A causal link between the two seems likely. Subduction of the fracture zone is a possible cause for both the change in strike of the trench and forearc north of Nias. This would imply an eastward bend of the N-S trending ridge during the subduction process. Isostatic residual anomalies were calculated and a 3D density model of the subduction zone off Sumatra was developed, using BGR multi-channel seismic and refraction seismic as constraints.

Heyde, I.; Franke, D.; Schnabel, M.

2006-12-01

261

75 FR 23582 - Annular Casing Pressure Management for Offshore Wells  

Federal Register 2010, 2011, 2012, 2013

...develop the industry standard. Offshore Operators Committee (OOC...Casing Pressure Management for Offshore Wells (74 FR 38147, July...annular casing pressure in offshore wells. (4) This final rule...Gas Extraction, and 213111, Drilling Oil and Gas Wells. For...

2010-05-04

262

Extreme Loads for an Offshore Wind Turbine using Statistical  

E-print Network

Extreme Loads for an Offshore Wind Turbine using Statistical Extrapolation from Limited Field Data,itiscommontoeithercarry out extensive simulation studies or undertake a field measurement campaign. At the Blyth offshore wind here is to estimate extreme loads for an offshore wind turbine for which the environmental and load

Manuel, Lance

263

Scour around an offshore wind turbine W.F. Louwersheimer  

E-print Network

Scour around an offshore wind turbine MSc Thesis W.F. Louwersheimer January, 2007 Delft University #12;Scour around an offshore wind turbine Delft University of Technology Ballast Nedam - Egmond iii Scour around an offshore wind turbine W.F. Louwersheimer Student number 1067419 January, 2007

Langendoen, Koen

264

REVIEW Open Access Assessing environmental impacts of offshore wind  

E-print Network

REVIEW Open Access Assessing environmental impacts of offshore wind farms: lessons learned and recommendations for the future Helen Bailey1* , Kate L Brookes2 and Paul M Thompson3 Abstract Offshore wind power literature and our experience with assessing impacts of offshore wind developments on marine mammals

Aberdeen, University of

265

Challenges in Predicting Power Output from Offshore Wind Farms  

E-print Network

Challenges in Predicting Power Output from Offshore Wind Farms R. J. Barthelmie1 and S. C. Pryor2 Abstract: Offshore wind energy is developing rapidly in Europe and the trend is towards large wind farms an offshore wind farm, accurate assessment of the wind resource/power output from the wind farm is a necessity

Pryor, Sara C.

266

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

E-print Network

Offshore Wind Farm Layout Optimization (OWFLO) Project: Preliminary Results Christopher N. Elkinton the layout of an offshore wind farm presents a significant engineering challenge. Most of the optimization literature to date has focused on land-based wind farms, rather than on offshore farms. Typically, energy

Massachusetts at Amherst, University of

267

Wave Models for Offshore Wind Turbines Puneet Agarwal  

E-print Network

Wave Models for Offshore Wind Turbines Puneet Agarwal§ and Lance Manuely Department of Civil. These wave modeling assumptions do not adequately represent waves in shallow waters where most offshore wind for estimating loads on the support structure (monopile) of an offshore wind turbine. We use a 5MW utility

Manuel, Lance

268

Using satellite data for mapping offshore wind resources and wakes  

E-print Network

Using satellite data for mapping offshore wind resources and wakes Charlotte Bay Hasager, Merete Energy Department, Denmark Copenhagen Offshore Wind, Conference and Exhibition 26-28 October 2005, Copenhagen, Denmark #12;· Offshore winds from satellites · Wind ressource estimation · Wake estimation

269

Quantifying Offshore Wind Resources from Satellite Wind Maps  

E-print Network

Quantifying Offshore Wind Resources from Satellite Wind Maps: Study Area the North Sea C. B National Laboratory, Roskilde, Denmark Offshore wind resources are quantified from satellite synthetic the spatial extent of the wake behind large offshore wind farms. Copyright © 2006 John Wiley & Sons, Ltd

Pryor, Sara C.

270

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 85SAR(m/s) Hasager, Dellwik, Nielsen and Furevik, 2004, Validation of ERS-2 SAR offshore wind-speed maps

271

Electric power from offshore wind via synoptic-scale interconnection  

E-print Network

Electric power from offshore wind via synoptic-scale interconnection Willett Kemptona,1 , Felipe M regional estimate, Kempton et al. (2) calculated that two-thirds of the offshore wind power off the U in the U.S. Atlantic region is already underway. Fig. 1 shows as black squares offshore wind developments

Firestone, Jeremy

272

Assessing Novel Foundation Options for Offshore Wind Turbines  

E-print Network

Assessing Novel Foundation Options for Offshore Wind Turbines B.W. Byrne, BE(Hons), BCom, MA, DPhil G.T. Houlsby, MA, DSc, FREng, FICE Oxford University, UK SYNOPSIS Offshore wind farms, and of these wind power is the only one to be exploited on a commercial scale at present. Three major offshore

Byrne, Byron

273

Boundary Spanning in Offshored Information Systems Development Projects  

ERIC Educational Resources Information Center

Recent growth in offshore outsourcing of information systems (IS) services is accompanied by managing the offshore projects successfully. Much of the project failures can be attributed to geographic and organizational boundaries which create differences in culture, language, work patterns, and decision making processes among the offshore project…

Krishnan, Poornima

2010-01-01

274

Review report 2004 The Danish Offshore Wind Farm  

E-print Network

- 1 - Review report 2004 The Danish Offshore Wind Farm Demonstration Project: Horns Rev and Nysted Offshore Wind Farms Environmental impact assessment and monitoring Prepared for The Environmental Group By Elsam Engineering and ENERGI E2 October 2005 #12;- 2 - Review Report 2004 The Danish Offshore Wind Farm

275

Hydroacoustic Monitoring of Fish Communities in Offshore Wind Farms  

E-print Network

#12;Hydroacoustic Monitoring of Fish Communities in Offshore Wind Farms Annual Report 2004 Horns Rev Offshore Wind Farm Published: May 2005 Prepared by: Christian B. Hvidt Lars Brünner Frank Reier farms Horns Rev Offshore Wind Farm 2004 2519-03-003-rev3.doc TABLE OF CONTENTS PAGE 1. Introduction

276

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

E-print Network

, Roskilde April 2003 #12;Abstract Europe has large offshore wind energy potential that is poised energy supply. Offshore wind energy developments are underway in many European countries with planned the impact of thermal flows, roughness and orography on offshore wind speeds. The model hierarchy developed

277

Offshore safety case approach and formal safety assessment of ships  

Microsoft Academic Search

Problem: Tragic marine and offshore accidents have caused serious consequences including loss of lives, loss of property, and damage of the environment. Method: A proactive, risk-based “goal setting” regime is introduced to the marine and offshore industries to increase the level of safety. Discussion: To maximize marine and offshore safety, risks need to be modeled and safety-based decisions need to

J Wang

2002-01-01

278

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 Assessment - Offshore Wave Energy Conversion Devices Introduction E2I EPRI is leading a U.S. nationwide

279

International Offshore Students' Perceptions of Virtual Office Hours  

ERIC Educational Resources Information Center

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…

Wdowik, Steven; Michael, Kathy

2013-01-01

280

Assessment of Ports for Offshore Wind Development in the United States  

SciTech Connect

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

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

2014-03-21

281

Ice island creation, drift, recurrences, mechanical properties, and interactions with arctic offshore oil production structures. Final report  

SciTech Connect

Research and engineering studies on first-year sea ice for over two decades has resulted in the design, construction, and operation of jacket platforms, of artificial islands, and of massive gravity structures which routinely withstand moving sea ice of thickness up to 2 meters. However, the less-common interactions between such structures and moving multiyear ice ({ge}3 meters thick), and also moving ice islands (10 to 60 meters thick) remain as the unknown and potentially most serious hazard for Arctic offshore structures. In this study, research was addressed across the complete span of remaining questions regarding such features. Ice island components, thickness distributions, scenarios and models for the interactions of massive ice features with offshore structures, all were considered. Ice island morphology and calving studies were directed at the cluster of 19 ice islands produced in a calving from the Ward Hunt Ice Shelf on Ellesmere Island in 1983, and also at a calving from the Milne Ice Shelf in 1988. The statistics of ice island dynamics, on both a short-term small-scale basis and also on a long-term basis, were studied. Typical wind velocities of 5 to 7.5 meters per second led to ice island speeds of about 0.014 of the wind speed, at an angle of 20{degrees} to the right of the wind direction. Ice island samples were tested for their stress/strain characteristics. Compressive strength values ranged from 1.64 MPa at a strain rate of 2 {times} 10{sup {minus}7} s{sup {minus}1} to 6.75 MPa at a strain rate of 1 {times} 10{sup {minus}3} s{sup {minus}1}. Scenarios for ice island/structure interactions were developed, and protective countermeasures such as spray ice and ice rubble barriers were suggested. Additional computer modeling of structure/ice interactions for massive ice features is recommended.

Sackinger, W.M.; Jeffries, M.O.; Li, Fucheng; Lu, Mingchi

1991-03-01

282

Large enigmatic crater structures offshore southern California  

Microsoft Academic Search

Digital mosaics of swath and conventional bathymetry data reveal large, distinct near-circular crater structures in the Inner Continental Borderland offshore southern California. Two have maximum crater diameters that exceed 30 km and a third has a crater diameter of approximately 12 km. All three features exhibit the morphology of large complex craters (raised outer rim, ring moat and central uplift)

Mark R. Legg; Craig Nicholson; Chris Goldfinger; Randall Milstein; Marc J. Kamerling

2004-01-01

283

Planning and evaluation parameters for offshore complexes  

NASA Technical Reports Server (NTRS)

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.

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

1976-01-01

284

Competitive Bidding for Offshore Petroleum Leases  

Microsoft Academic Search

This paper develops a formal model of competitive bidding to analyze some aspects of the federal offshore oil leasing system. The lease sales of interest are often characterized by small numbers of auction participants and by high levels of uncertainty regarding the true values of the leases offered. The model suggests that these circumstances may lead to the capture of

Douglas K. Reece

1978-01-01

285

Offshore Investments by Colleges Draw Scrutiny  

ERIC Educational Resources Information Center

Billions of dollars in untaxed, offshore investments by college endowments could be subject to taxation under a proposal being considered by the leaders of the U.S. Senate Finance Committee. The proposed change, which targets hedge funds, a popular investing strategy for many colleges, would affect the largest college endowments, including those…

Fain, Paul; Wolverton, Brad

2007-01-01

286

Sea loads on ships and offshore structures  

Microsoft Academic Search

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

O. M. Faltinsen

1990-01-01

287

Are Offshoring and Immigration Substitutes for Canada?  

Microsoft Academic Search

SUMMARY NDUSTRY CANADA ORIGINALLY PROPOSED the question in the title as the basis for a research paper. Because of the lack of data suitable for framing and testing a quantitative model, the resulting paper instead provides some tentative estimates of the relative sizes of immigration and offshoring in the Canadian context, specifically in the context of skilled services. Very approximate

John F. Helliwell

288

High-Alloy Materials for Offshore Applications  

Microsoft Academic Search

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,

T. F. Lemke; J. A. Harris

1983-01-01

289

Distributed computer control for an offshore platform  

Microsoft Academic Search

Mobil Exploration Norway Inc.'s Condeep offshore platform Statfjord A, in the North Sea, which has facilities for drilling, production, crude oil storage, gas compression, and custody-transfer to tankers through an articulated loading platform, as well as a 60 Mw electrical generator and distribution system, is fully instrumented via a Supervisory Control and Data Acquisition (SCADA) system. The SCADA system is

1978-01-01

290

Assessing offshore wind resources: An accessible methodology  

Microsoft Academic Search

This paper describes a method for assessing the electric production and value of wind resources, specifically for the offshore environment. Three steps constitute our method. First, we map the available area, delimiting bathymetric areas based on turbine tower technology, then assess competing uses of the ocean to establish exclusion zones. From exclusion zones, bathymetry, and turbine tower water depth limitations,

Amardeep Dhanju; Phillip Whitaker; Willett Kempton

2008-01-01

291

Assessing offshore wind resources: An accessible methodology  

Microsoft Academic Search

This paper describes a method for assessing the electric production and value of wind resources, specifically for the offshore environment. Three steps constitute our method. First, we map the available area, delimiting bathymetric areas based on turbine tower technology, then assess competing uses of the ocean to establish exclusion zones. From exclusion zones, bathymetry, and turbine tower water depth limitations,

Amardeep Dhanju; Phillip Whitaker; Willett Kempton

2007-01-01

292

Marine Fisheries On the cover: Offshore  

E-print Network

Marine Fisheries ~~WD~W On the cover: Offshore charter boats at Islamorada, Fla. See the article Fish Technology and Marine Pollution 32 u.s. DEPARTMENT OF COMMERCE Malcolm Baldrige, Secretary NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION John V. Byrne, Administrator National Marine Fisheries

293

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...

294

Sea Stars Underwater Offshore Northern California  

USGS Multimedia Gallery

Three sea stars on a rock, surrounded by a sandy seafloor littered with broken shells. Each sea star is approx. 10 - 15 cm (4-6 inches) across. Image acquired 4.5 km (3 miles) offshore Pigeon Point, southern San Mateo County, California at a depth of 52 meters....

295

Fish Swimming Underwater Offshore Northern California  

USGS Multimedia Gallery

A kelp greenling fish swimming above a seafloor of mixed gravel, cobble and rock outcrop with scattered shell. Fish is approx. 20 cm (8 inches) long. Image acquired 1 km (0.62 miles) offshore Half Moon Bay, California at a depth of 14 meters (46 ft). Also in the image are encrusting sponge...

296

Cleaning of a copper matte smelting slag from a water-jacket furnace by direct reduction of heavy metals.  

PubMed

Cleaning experiments of a copper matte smelting slag from the water-jacket furnace was undertaken by direct reduction in a laboratory-scale electric furnace. The effects of coal-to-slag ratio, w, and the reduction time, t, were considered for two different coal/slag mixing procedures. In the first procedure, metallurgical coal was added to the molten slag, whereas in the second procedure, coal was premixed with the solid slag before charging into the furnace. The recovery of heavy metals (Cu, Co), and the fuming of Pb and Zn were investigated. Contamination of the metal phase by iron and the acidity index of the final slag were analysed as these may impede the economical viability of the process. The lower w value of 2.56% yielded a recovery rate of less than 60% for copper and less than 50% for cobalt, and around 70% for zinc. However, increasing w to 5% allowed the recovery of 70-90% for Cu, Co and Zn simultaneously after 30-60 min reduction of the molten slag. After reduction, the cleaned slags contained only small amounts of copper and cobalt (<0.4 wt%). Fuming of lead and zinc was efficient as the %Pb of the residual slag dropped to levels lower than 0.04% after 30 min of reduction. Ninety percent of the lead was removed from the initial slag and collected in the dusts. The zinc content of the cleaned slags quickly dropped to between 1 and 3 wt% from the initial 8.2% after 30 min reduction for w value of 5 and after 60 min reduction for w value of 2.56. The dusts contained about 60% Zn and 10% Pb. Recovery of lead from fuming of the slag was higher than 90% in all the experimental conditions considered in this study. PMID:18848396

Maweja, Kasonde; Mukongo, Tshikele; Mutombo, Ilunga

2009-05-30

297

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

SciTech Connect

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.

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

2014-02-01

298

Drilling tools for continuous offshore operations  

SciTech Connect

Offshore drilling tools are still the object of improvement aimed in achieving maximum production or scientific effect of minimum costs. One of perspective ways of improving offshore scientific drilling indices is utilization of drilling systems which provide continuous hole penetration without pulling out the drill string aboard of drill vessel for bit replacement. The report presents specific features of the drilling tools supplying Complete Coring System (CCS) operations. CCS can provide continuous coring and drilling as well as logging in any geological profiles from the soft to very hard formations. One of the basic principles in coring is slimhole pilot drilling, thus giving many advantages. Development of drilling tools for CCS is based upon vast experience in designing drilling tools, including the retractable bits. In perspective CCS can be applied in stratigraphic and scientific drilling in deep water, especially in complicated geological conditions.

Gelfgat, M.Y. [Aquatic Company, Ltd., Moscow (Russian Federation); Surkov, D.V.; Buyanovsky, I.N. [All-Russia Scientific Research Inst. of Drilling Techniques, Moscow (Russian Federation)

1995-12-31

299

The geotechnical centrifuge in offshore engineering  

SciTech Connect

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.

Murff, J.D.

1996-12-31

300

Perspectives of offshore geothermal energy in Italy  

NASA Astrophysics Data System (ADS)

Italy is the first European and world's fifth largest producer of geothermal energy for power generation which actually accounts for less than 2% of the total electricity production of the country. In this paper after a brief introduction to the basic elements of high-enthalpy geothermal systems, we discuss the potentialities represented by the submarine volcanoes of the South Tyrrhenian Sea. In particular we focus on Marsili Seamount which, according to the literature data, can be considered as a possible first offshore geothermal field; then we give a summary of the related exploitation pilot project that may lead to the realization of a 200MWe prototype power plant. Finally we discuss some economic aspects and the development perspectives of the offshore geothermal resource taking into account the Italian energy framework and Europe 2020 renewable energy target.

Armani, F. B.; Paltrinieri, D.

2013-06-01

301

Offshore distributional patterns of Hawaiian fish larvae  

Microsoft Academic Search

An analysis of ichthyoplankton samples based on relative abundance reveals pronounced inshore\\/offshore distributional gradients for most Hawaiian fish larvae. Larvae of pelagic bay species are found almost exclusively in semi-enclosed bays and estuaries. Larvae of pelagic neritic species are more or less uniformly distributed with distance from shore. The larvae of reef species with non-pelagic eggs are most abundant close

J. M. Leis; J. M. Miller

1976-01-01

302

Automatic welding comes of age. [Offshore  

Microsoft Academic Search

Automatic pipe welding systems today fall into three main categories: gas metal arc welding, gas-tungsten arc welding, and flash-butt welding. The first automatic welding devices used offshore were the CRC and H.C. Price systems. Both use gas metal arc welding with a consumable steel filler wire. The recently developed McDermott flash-butt welding system is described. (DLC)

D. L. Jr

1981-01-01

303

Designing Australia's North West Shelf offshore pipeline  

SciTech Connect

Design studies for the offshore pipeline system for the North West Shelf project in Australia commenced in the early 1970s. The trunkline from the North Rankin A platform to shore has recently been completed as the first part of the offshore pipeline system for the North West Shelf project. This pipeline originates from the platform in a water depth of 125 m (410 ft), enters the mouth of Mermaid Sound, and terminates just south of Withnell Bay on the Burrup Peninsula, on the North West coastline of Western Australia. The pipeline is 1,016 mm (40 in.) in diameter and 134.2 km (83.4 miles) long. It will operate in two-phase flow, bringing both gas and condensate to an onshore plant near its landfall. A slugcatcher has been constructed within the plant to receive liquidhydrocarbon slugs from the pipeline. The trunkline to shore will initially serve only the one offshore platform and operate at about 25% of its capacity to supply the Western Australian domestic gas market. The domestic gas plant on the Burrup Peninsula is being constructed by Woodside to produce pipeline-quality gas for delivery to the State Energy Commission and condensate for shipment by coastal tankers.

Seymour, E.V.; Craze, D.J.; Ruinen, W.

1984-05-07

304

Offshore Essaouira basin: Geology and hydrocarbon potential  

SciTech Connect

The study area lies in the offshore extension of the onshore Essaouria basin. The Mesozoic development of the Essaouira margin was largely controlled by Late Triassic to Mid-Jurassic rifting and subsequent opening of the Central Atlantic, with the evolution of a typical passive, opening of the Central Atlantic, with the evolution of a typical passive, continental margin. Diapiric salt structure recognized on seismic defines a Late Triassic-Early Jurassic salt basin in the offshore area initiated during early rifting. Subsidence and sea-level rise during Jurassic resulted in carbonate platform development. This was followed during Cretaceous and Tertiary time by the deposition of a prograding siliciclastic system. Only three wells have been drilled in this basin. Although drilled on poorly defined prospects, these wells encountered gas and oil shows. Fairly extensive seismic coverage of good quality data is now available. A study based on an integrated approach involving seismic facies definition and mapping, correlation with well data, identification of the principal control on sedimentation, and basin modeling in conjunction with source rock prediction and maturity modeling has been carried out. Results have shown that hydrocarbon potential in the offshore Essaouira basin has not yet been substantiated by drilling. Attractive structural and stratigraphic prospects exist in the shelf, shelf edge, and the slope, and await confirmation by drilling.

Jabour, H.; Ait Salem, A. (ONAREP, Rabat (Morocco))

1991-03-01

305

Caisson shield for arctic offshore production platform  

SciTech Connect

A caisson shield for the protection of an offshore production platform and, more particularly, a caisson shield for use in an arctic environment for the protection of the offshore structure in iceberg-infested waters which is capable of absorbing the destructive forces of an impact produced by a large iceberg. The caisson shield consists of an essentially annular concrete structure encircling at least the submerged support section of the offshore production platform including vertically upstanding concentrically spaced, annular side walls, a horizontal slab base resting on the marine bottom on which the side walls are supported, and a slab top supported on the side walls, and including annularly spaced internal radial partition walls whereby the entire overall caisson shield structure provides a generally toroidal configuration incorporating a plurality of closed compartments. In one embodiment of the invention, located along the outer annular wall is a plurality of arcuate wall sections forming a series of arches and enclosed compartments between each arcuate wall section and the outer annular wall, which impart a ''scallop-like'' configuration to the outer circumference of the caisson shield. The ''scallop-like'' outer walls are capable of resisting and absorbing extremely high ice loads by being adapted to progressively crush the leading edge of an impacting iceberg and to thereby minimize the crush of the iceberg against the caisson shield before coming to rest against the shield.

Clinton, J. D.; Reusswig, G. H.

1985-03-12

306

Operating requirements for and historical operations of Arctic offshore drilling systems in the United States  

SciTech Connect

Many of the floating and bottom-founded drilling structures used for oil and gas exploration in the US Arctic have recently been proposed for use in the Russian Arctic offshore. This paper describes the US Arctic environmental conditions in terms of operation capabilities for the various types of drilling systems. A brief description of the various types of drilling systems used to date in the US Arctic is provided as background information. Also presented are the special regulatory requirements and contingency plans which have been developed for offshore Arctic drilling-system operations. The paper will summarize information on the operating experiences of the various drilling systems used in the US Arctic Outer Continental Shelf (OCS) to date.

Regg, J.; Breitmeier, J.; Walker, J. [Dept. of the Interior, Anchorage, Alaska (United States). Minerals Management Service

1995-12-31

307

Offshore oil & gas markets heating up: Gulf of Mexico rising from `Dead Sea` image; healthy Gulf, North Sea markets combine for big impact  

SciTech Connect

Only three years ago, Gulf of Mexico drilling activity was so moribund that it was termed the Dead Sea. But the market has changed so there is now effectively 100 percent utilization in several important categories of offshore rigs, and almost every type of offshore rig is now getting higher use and better rates. What makes these changes so profound is that few industry participants saw this tightness developing, and almost no one predicted that it would occur so soon. Even the largest offshore contractors were pleasantly surprised as they watched their key drilling markets tighten so uickly after many years of vast oversupply. Today, while neither the Gulf of Mexico nor the North Sea could be described as booming, they are not falling apart either. The combination of both markets merely being normal at the same time has made a big impact on the worldwide supply and demand for offshore drilling. The need for steady and increasing offshore oil and gas production has never been so high. The technology now in place is allowing the development of offshore areas deemed almost impossible less than a decade ago. Also, the vast excess supply of offshore equipment is gone for many forms of drilling, and the need for steadily higher dayrates is real and will merely increase over time.

Simmons, M.R.

1995-09-01

308

26th Annual offshore technology conference: 1994 Proceedings  

SciTech Connect

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.

Not Available

1994-01-01

309

Horns Rev Offshore Wind Farm Environmental Impact Assessment  

E-print Network

Horns Rev Offshore Wind Farm Environmental Impact Assessment of Sea Bottom and Marine Biology #12 Design ApS 01.03.2000 #12;Bio/consult A/S Horns Rev. Offshore Wind Farm Doc. No. 1680-1-02-03-003 rev. 1........................................................................................................................................................... 36 #12;Bio/consult A/S ELSAM Horns Rev. Offshore Wind Farm Doc. No. 1680-1-02-03-003 rev. 1 Page 4

310

The submerged offshore breakwater and its effects on seafloor topography  

E-print Network

/B for the emergent offshore breakwater. It has been postulated that tombolo formation cannot occur in the case of the submerged offshore breakwater. However, the spit-growth/relative d1stance from shore relationship is expected to be similar. The beach...THE SUBMERGED OFFSHORE BREAKWATER AND ITS EFFECTS ON SEAFLOOR TOPOGRAPHY A Thesis by JAMES RUSSELL TALLENT Submitted to the Graduate College of Texas AGM University in partial fulfillment of the requirements for the degree of MASTER...

Tallent, James Russell

2012-06-07

311

Offshore Code Comparison Collaboration (OC3) for IEA Wind Task 23 Offshore Wind Technology and Deployment  

SciTech Connect

This final report for IEA Wind Task 23, Offshore Wind Energy Technology and Deployment, is made up of two separate reports, Subtask 1: Experience with Critical Deployment Issues and Subtask 2: Offshore Code Comparison Collaborative (OC3). Subtask 1 discusses ecological issues and regulation, electrical system integration, external conditions, and key conclusions for Subtask 1. Subtask 2 included here, is the larger of the two volumes and contains five chapters that cover background information and objectives of Subtask 2 and results from each of the four phases of the project.

Jonkman, J.; Musial, W.

2010-12-01

312

The outsourcing and offshoring competitive landscape and its uncertainties  

E-print Network

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 ...

Sultan, Ziad R. (Ziad Raymond)

2005-01-01

313

Operational Impacts of Large Deployments of Offshore Wind (Poster)  

SciTech Connect

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.

Ibanez, E.; Heaney, M.

2014-10-01

314

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

Microsoft Academic Search

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,

Yong Zhao; Yanbiao Liao

2003-01-01

315

Venezuela offshore oil and gas production development: Past, present and future  

SciTech Connect

This paper presents a short history of offshore oil and gas production in Venezuela starting in Lake Maracaibo in 1923. The main emphasis has been the results of the recent R and D and the exploratory offshore programs in areas like Orinoco Delta located in the Atlantic Ocean, Northeast and Northwest Venezuela in the Caribbean sea. In the R and D offshore program the main objectives were: (1) To establish the local environmental, oceanographical, geotechnical and seismicity conditions for the Venezuelan Continental Platform. (2) To give a technical support to the PDVSA Operating Affiliates during the exploratory programs including: (a) to develop accurate drilling vessel positioning systems; (b) evaluation of sea bottom geotechnical conditions for safely operating the jack-ups and drilling vessels involved in the exploratory wells and (c) to identify those areas which because of their special nature require further investigation to establish preliminary type of platforms required for the areas to be developed or to evaluate other solutions proposed by Foreign Consultant Engineering Companies to the PDVSA Operating Affiliated Companies. The main objective of PDVSA for the coming future will be to develop the North of Paria Gas Field through the initially named Christopher Columbus Project now Sucre Gas, S.A., a consortium conformed by LaGoven, S.A. Shell, Exxon and Mitsubishi. objective of this paper is to give an idea of the history of the Venezuelan Oil and Gas Offshore development giving emphasis to the results of the INTEVEP S.A. Red offshore program and to show some results of the particular characteristics of oceanographical, environmental, geotechnical and seismic conditions in the main areas evaluated during the exploratory program: Orinoco Delta, Gulf of Paria and North of Paria.

Perez La Salvia, H.; Schwartz, E.; Contreras, M.; Rodriguez, J.I.; Febres, G.; Gajardo, E.

1995-12-01

316

75 FR 60097 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling  

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department of Energy...Deepwater Horizon Oil Spill and Offshore Drilling (the Commission). The Commission...any oil spills associated with offshore drilling in the future. The...

2010-09-29

317

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

Code of Federal Regulations, 2012 CFR

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

2012-10-01

318

40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...  

Code of Federal Regulations, 2013 CFR

...Countermeasure Plan requirements for offshore oil drilling, production, or workover...Countermeasure Plan requirements for offshore oil drilling, production, or workover...the owner or operator of an offshore oil drilling, production, or...

2013-07-01

319

40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...  

Code of Federal Regulations, 2011 CFR

...Countermeasure Plan requirements for offshore oil drilling, production, or workover...Countermeasure Plan requirements for offshore oil drilling, production, or workover...the owner or operator of an offshore oil drilling, production, or...

2011-07-01

320

77 FR 71607 - Mobile Offshore Drilling Unit (MODU) Electrical Equipment Certification Guidance  

Federal Register 2010, 2011, 2012, 2013

...USCG-2012-0839] Mobile Offshore Drilling Unit (MODU) Electrical Equipment...on foreign-flagged Mobile Offshore Drilling Units (MODUs) that have never...Construction and Equipment of Mobile Offshore Drilling Units (2009 IMO MODU...

2012-12-03

321

40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...  

...Countermeasure Plan requirements for offshore oil drilling, production, or workover...Countermeasure Plan requirements for offshore oil drilling, production, or workover...the owner or operator of an offshore oil drilling, production, or...

2014-07-01

322

75 FR 65309 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling  

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department of Energy...Deepwater Horizon Oil Spill and Offshore Drilling (the Commission). The Commission...any oil spills associated with offshore drilling in the future. The...

2010-10-22

323

76 FR 39885 - Risk-Based Targeting of Foreign Flagged Mobile Offshore Drilling Units (MODUs)  

Federal Register 2010, 2011, 2012, 2013

...Targeting of Foreign Flagged Mobile Offshore Drilling Units (MODUs) AGENCY: Coast...Targeting of Foreign Flagged Mobile Offshore Drilling Units (MODUs). This policy...every foreign-flagged mobile offshore drilling unit (MODU) must undergo...

2011-07-07

324

75 FR 69652 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling  

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department of Energy...Deepwater Horizon Oil Spill and Offshore Drilling (the Commission). The Commission...any oil spills associated with offshore drilling in the future. The...

2010-11-15

325

40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...  

Code of Federal Regulations, 2012 CFR

...Countermeasure Plan requirements for offshore oil drilling, production, or workover...Countermeasure Plan requirements for offshore oil drilling, production, or workover...the owner or operator of an offshore oil drilling, production, or...

2012-07-01

326

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

...Fees for examination of foreign mobile offshore drilling units. 2.10-130 Section 2...Fees for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

2014-10-01

327

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

Code of Federal Regulations, 2013 CFR

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

2013-10-01

328

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

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling By the authority vested in me...Deepwater Horizon Oil Spill and Offshore Drilling (the ``Commission...oil spills associated with offshore drilling, taking into...

2010-05-26

329

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

Code of Federal Regulations, 2013 CFR

...Fees for examination of foreign mobile offshore drilling units. 2.10-130 Section 2...Fees for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

2013-10-01

330

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

Code of Federal Regulations, 2010 CFR

...Fees for examination of foreign mobile offshore drilling units. 2.10-130 Section 2...Fees for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

2010-10-01

331

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

Code of Federal Regulations, 2012 CFR

...Fees for examination of foreign mobile offshore drilling units. 2.10-130 Section 2...Fees for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

2012-10-01

332

33 CFR 147.T08-849 - DEEPWATER HORIZON Mobile Offshore Drilling Unit Safety Zone.  

Code of Federal Regulations, 2010 CFR

...false DEEPWATER HORIZON Mobile Offshore Drilling Unit Safety Zone. 147.T08-849...T08-849 DEEPWATER HORIZON Mobile Offshore Drilling Unit Safety Zone. (a) Location...DEEPWATER HORIZON, a Mobile Offshore Drilling Unit (MODU), that...

2010-07-01

333

76 FR 78938 - Carpinteria Offshore Field Redevelopment Project-Developmental Drilling Into the Carpinteria...  

Federal Register 2010, 2011, 2012, 2013

...Management Carpinteria Offshore Field Redevelopment...Developmental Drilling Into the Carpinteria Offshore Field Oil and Gas...Description of the Area Drilling will take place from...Channel, 3.7 miles offshore of the City of...

2011-12-20

334

75 FR 47584 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling  

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department of Energy...Deepwater Horizon Oil Spill and Offshore Drilling (the Commission). The Commission...any oil spills associated with offshore drilling in the future. The...

2010-08-06

335

75 FR 56526 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling  

Federal Register 2010, 2011, 2012, 2013

...Deepwater Horizon Oil Spill and Offshore Drilling AGENCY: Department of Energy...Deepwater Horizon Oil Spill and Offshore Drilling (the Commission). The Commission...any oil spills associated with offshore drilling in the future. The...

2010-09-16

336

40 CFR 112.11 - Spill Prevention, Control, and Countermeasure Plan requirements for offshore oil drilling...  

Code of Federal Regulations, 2010 CFR

...Countermeasure Plan requirements for offshore oil drilling, production, or workover...Countermeasure Plan requirements for offshore oil drilling, production, or workover...the owner or operator of an offshore oil drilling, production, or...

2010-07-01

337

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

Code of Federal Regulations, 2011 CFR

...Fees for examination of foreign mobile offshore drilling units. 2.10-130 Section 2...Fees for examination of foreign mobile offshore drilling units. Each foreign mobile offshore drilling unit must pay: (a) For...

2011-10-01

338

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

Code of Federal Regulations, 2011 CFR

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

2011-10-01

339

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

Code of Federal Regulations, 2010 CFR

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

2010-10-01

340

UNDERLYING MOTIVATIONS FOR DELAWARE PUBLIC PARTICIPATION IN SUPPORT OF OFFSHORE WIND  

E-print Network

UNDERLYING MOTIVATIONS FOR DELAWARE PUBLIC PARTICIPATION IN SUPPORT OF OFFSHORE WIND: IMPLICATIONS PARTICIPATION IN SUPPORT OF OFFSHORE WIND: IMPLICATIONS FOR STATE ENERGY POLICY by Jacqueline D Piero Approved ................................................................................................. 3 Offshore wind: a new option in the United States.............................................. 4

Firestone, Jeremy

341

78 FR 16529 - Notice of Determination of No Competitive Interest, Offshore Virginia  

Federal Register 2010, 2011, 2012, 2013

...of No Competitive Interest, Offshore Virginia AGENCY: Bureau of...Shelf (OCS) Research Lease Offshore Virginia...the Outer Continental Shelf Offshore Virginia, that BOEM published...to acquire an OCS lease for wind energy research...

2013-03-15

342

76 FR 14681 - Commercial Leasing for Wind Power on the Outer Continental Shelf (OCS) Offshore Massachusetts...  

Federal Register 2010, 2011, 2012, 2013

...Interest (RFI) in Commercial Wind Energy Leasing Offshore Massachusetts...period on the RFI in Commercial Wind Energy Leasing Offshore Massachusetts...Register the RFI in Commercial Wind Energy Leasing Offshore...

2011-03-17

343

33 CFR 100.728 - Special Local Regulations; Hurricane Offshore Classic, St. Petersburg, FL.  

... false Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...100.728 Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...All vessel traffic, not involved in the Hurricane Offshore Classic, entering...

2014-07-01

344

33 CFR 100.728 - Special Local Regulations; Hurricane Offshore Classic, St. Petersburg, FL.  

Code of Federal Regulations, 2013 CFR

... false Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...100.728 Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...All vessel traffic, not involved in the Hurricane Offshore Classic, entering...

2013-07-01

345

33 CFR 100.728 - Special Local Regulations; Hurricane Offshore Classic, St. Petersburg, FL.  

Code of Federal Regulations, 2012 CFR

... false Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...100.728 Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...All vessel traffic, not involved in the Hurricane Offshore Classic, entering...

2012-07-01

346

33 CFR 100.728 - Special Local Regulations; Hurricane Offshore Classic, St. Petersburg, FL.  

Code of Federal Regulations, 2010 CFR

... false Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...100.728 Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...All vessel traffic, not involved in the Hurricane Offshore Classic, entering...

2010-07-01

347

33 CFR 100.728 - Special Local Regulations; Hurricane Offshore Classic, St. Petersburg, FL.  

Code of Federal Regulations, 2011 CFR

... false Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...100.728 Special Local Regulations; Hurricane Offshore Classic, St. Petersburg...All vessel traffic, not involved in the Hurricane Offshore Classic, entering...

2011-07-01

348

Seismic no-data zone, offshore Mississippi delta: depositional controls on geotechnical properties, velocity structure, and seismic attenuation  

SciTech Connect

Seismic acquisition problems plague exploration and production offshore the Mississippi delta. Geologic and geotechnical analyses of 300-ft borings and 20-ft piston cores, combined with subbottom acoustic measurements, help identify and predict the locations, types, and magnitudes of anomalous seismic zones. This knowledge is used to design acquisition and processing techniques to circumvent the seismic problems.

May, J.A.; Meeder, C.A.; Tinkle, A.R.; Wener, K.R.

1986-09-01

349

Proceedings of the 25th annual offshore technology conference. Volume 1: Geology, earth sciences and environment  

SciTech Connect

This conference proceedings represents volume 1 of a 4 volume conference relating to offshore operations in both energy and non-energy fields of resource development. This volume discusses the use of geophysical surveying techniques and equipment for mapping the seafloor; the design and use of offshore platforms; safety engineering systems; interpretation techniques for offshore survey data; environmental impacts from offshore operations; geology of offshore areas; and regulations pertaining to the development of offshore resources.

Not Available

1993-01-01

350

Arctic and offshore research. Technology status report  

SciTech Connect

The DOE Arctic and Offshore Research (AOR) effort is designed to meet the needs for a centralized, high-quality, Arctic energy-related data base and for long-term, high-risk research. The ultimate purpose of the DOE effort is to promote extensive private use of the evolving AOR technology data base in order to accelerate development of Arctic oil and gas resources. In assessing the Arctic energy-related research needs as delineated in this report, the Morgantown Energy Technology Center (METC), with the DOE Fossil Energy Office of Oil, Gas, and Shale Technology, developed the following activities: AOR Energy-Related Technology Data Base Development; AOR Seminars and Workshops; Arctic and Offshore Energy Research Coordination; Sea Ice Research; Seafloor/Soils Research; and Subice Systems Development. The DOE AOR effort was initiated in FY 1983, the early development activities were performed in January and February 1983, and the effort evolved to its present form by the conclusion of FY 1984. The current activities have included determining the Arctic bibliographic data base and initiating most pieces of the research described above (except multiyear ice properties and pipeline research). Some of the FY 1984 major accomplishments are: four to five ice islands 1 to 2 miles in length drifting off the Ellesmere ice shelves north of Ellesmere Island were aerially surveyed. A report was completed on the location of the ice shelf edge, breakup, and regrowth of the Ellesmere ice shelves over the past two decades. Ice-ridging shear zone studies have shown that the 6- to 10-feet high shoals usually under the shear zone are not totally destroyed from ice gouging from one year to the next, but that the ice gouging may be instrumental in initiating and maintaining the shoals, which may protect Arctic offshore structures. Airborne radar sensing techniques were used to determine the electromagnetic properties of sea ice and physical properties.

Not Available

1984-10-01

351

Cathodic protection retrofit of an offshore pipeline  

SciTech Connect

Cathodic protection (CP) anodes and corrosion coating on two offshore pipelines were damaged during deep water installation. In-situ methods for deep-water inspection and repair of the pipelines` CP and coating systems were developed and used. High-pressure natural gas Pipeline. A design was 5.6 miles of 8.625 in. OD by 0.406 in. W.T. API SL, Grade X-42, seamless line pipe. Pipeline B design was 0.3 miles of similar specification pipe. Both pipelines were mill-coated with 14 mil of fusion-bonded epoxy (FBE) corrosion coating. Girth welds were field-coated with FBE.

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

1997-09-01

352

High-alloy materials for offshore applications  

SciTech Connect

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.

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

1983-05-01

353

Proceedings of the nineteenth annual offshore technology conference. Vol. 3  

SciTech Connect

This book presents the papers given at a conference on offshore platforms. Topics considered at the conference included grouted pile-sleeve connections, tanker ships, mooring systems, offshore drilling, drill pipes, subsea control valves, thermal insulation coatings, submarine pipeline stability, computerized simulation, hydrodynamics, pipe-soil interactions, wellhead performance, marine risers, directional drilling, vibration monitoring, welding, economics, tension leg platforms, and storage facilities.

Not Available

1987-01-01

354

Advances in offshore oil and gas pipeline technology  

SciTech Connect

This book examines the problems involved in the offshore transport of petroleum and natural gas. Topics considered include geotechnical considerations, pipeline lay-stress analysis, pipeline reeling, buckling, pipeline trenching by ploughing, the automated connection of offshore pipelines, concrete coatings, cathodic protection, spanning problems, inspection, emergency repair, safety, reliability, pressure effects, marine risers, and single point mooring systems.

delaMare, R.F.

1985-01-01

355

OPTIMAL DEVELOPMENT PLANNING OF OFFSHORE OIL AND GAS FIELD  

E-print Network

OPTIMAL 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, well drilling schedule and production profiles of oil, water and gas in each time period. The model can

Grossmann, Ignacio E.

356

26th Annual offshore technology conference: 1994 Proceedings  

SciTech Connect

This conference is the world's largest and most comprehensive technical conference and exhibition on offshore resource development. This conference is divided into four volumes with this volume containing conference papers relative to offshore drilling and well completion information. Papers also deal with construction specifications for marine risers and pipelines, along with any relevant installation and performance information.

Not Available

1994-01-01

357

Offshore Oil: Environmental Impacts on Land and Sea  

ERIC Educational Resources Information Center

Presents a counter position to that provided in SE 512 127 in which the author emphasizes that there are too many problems yet to be solved (related to offshore oil development) to proceed with full-scale development of offshore oil drilling. (PEB)

Baldwin, Pamela L.

1974-01-01

358

COMPOSITES & NANOCOMPOSITES in CIVIL, OFFSHORE and MINING INFRASTRUCTURE  

E-print Network

ACUN-6 COMPOSITES & NANOCOMPOSITES in CIVIL, OFFSHORE and MINING INFRASTRUCTURE 14­16November2012 Lunch, Tea and Drinks Western Foyer #12;ACUN6 ­ Composites and Nanocomposites in Civil, Offshore Director of ARC Centre of Excellence of Non-Ferrous Metals, UNSW 9:50 ­ 10:00 Prof. Sami Rizkalla

359

Dresser-Rand Offshore Baseplate Project Project Summary  

E-print Network

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

Demirel, Melik C.

360

Improvement of Offshore Wind Resource Modeling in the Mid-  

E-print Network

Improvement of Offshore Wind Resource Modeling in the Mid- Atlantic Bight Wind Energy Symposium Sienkiewicz , Chris Hughes 26 February 2013 #12;Improving Atmospheric Models for Offshore Wind Resource Interaction Tower ­ 23 m NOAA Buzzard's Bay Tower ­ 25 m Cape Wind Tower (60 m from 2003-2011; just platform

Firestone, Jeremy

361

Expansion analysis of offshore pipelines close to restraints  

SciTech Connect

A comprehensive review of offshore pipeline expansion due to thermal and pressure change is presented. An iterative method is introduced to model the interaction of off-shore pipeline expansion and restraining forces at the end of the pipeline. The effects of thermal gradients and restraining forces are studied to provide accurate pipeline design criteria. Numerical calculations are performed for various sizes of pipes.

Choi, H.S. [Hudson Engineering Corp., Houston, TX (United States)

1995-12-31

362

Aspects of Relevance in Offshore Wind Farm Reliability Assessment  

Microsoft Academic Search

The worldwide increase of installed wind power capacity demands the inclusion of wind farm (WF) models into power system reliability assessment. This paper looks at this issue from available literature, and presents a list of factors that highly influence offshore WF generation. An example of sequential Monte Carlo simulation applied to an offshore WF is described using a new synthetic

Nicola Barberis Negra; O. Holmstrom; Birgitte Bak-Jensen; Poul Sorensen

2007-01-01

363

International Collaboration on Offshore Wind Energy Under IEA Annex XXIII  

SciTech Connect

This paper defines the purpose of IEA Annex XXIII, the International Collaboration on Offshore Wind Energy. This international collaboration through the International Energy Agency (IEA) is an efficient forum from which to advance the technical and environmental experiences collected from existing offshore wind energy projects, as well as the research necessary to advance future technology for deep-water wind energy technology.

Musial, W.; Butterfield, S.; Lemming, J.

2005-11-01

364

Hydraulics in oil drilling from offshore mobile platforms  

Microsoft Academic Search

Because of the requirement for rapid operation of subsea safety equipment when drilling from offshore mobile platforms, special hydraulic equipment is required. This paper discusses the features of hydraulic control systems used for operation of subsea blowout preventer equipment from offshore floating drilling rigs. Special features of the hydraulic equipment are discussed along with specific requirements which influence component designs

1982-01-01

365

Ris-R-1298(EN) Validation of Satellite SAR Offshore  

E-print Network

.4 Acknowledgements 10 2 Offshore wind energy 10 2.1 Socio-economic context 10 2.2 Wind energy resources 11 2.3 Offshore wind resources 12 2.4 Wind energy resources in the coastal zone 13 2.5 The need for remote sensing impact on wind speed distributions of sam

366

Anchoring systems for marine renewable energies offshore platforms  

Microsoft Academic Search

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

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

2011-01-01

367

Map of Offshore Wind Energy Activity in North America  

NSDL National Science Digital Library

This map, from the North American Offshore Wind Project shows a Google map of all locations considered for having offshore wind energy. The location markers also provide information as to which projects are operational, proposed, suspended, or that have notable activity.

North American Offshore Wind Project

368

Offshore Heavy Oil in Campos Basin: The Petrobras Experience  

Microsoft Academic Search

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

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

369

Wind Resource Mapping for United States Offshore Areas: Preprint  

SciTech Connect

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.

Elliott, D.; Schwartz, M.

2006-06-01

370

The sea bottom temperature offshore southwestern Taiwan  

NASA Astrophysics Data System (ADS)

The sea bottom temperature (SBT) is important to apply to the heat flow estimation by BSR. Also the SBT may response the fluid migration near subsurface. Here we present 150 measurements of SBT offshore southwestern Taiwan where abundant gas hydrates has been evaluated. The SBT data were acquired by the heat probe with high resolution up to 0.0001°C. Thermal gradients were determined from several temperature sensors installed in different depth in the heat probe and then the SBT could be calculated by extrapolation. The results show that the SBT are between 2.23 and 10.14°C in water depth within the range of 409 to 3248 meters. Basically, the SBT is inversely hyperbolic proportional to the water depth for those 132 measurements the water depth are shallower than 2650 meters. The product of SBT and water depth has an average of 4419 m-°C and a standard deviation of 402 m-°C. However the SBT of others 18 measurements in the deep water region are scattered without any significant trend. Some measurements near mud diapirs in the shallow water have high anomaly SBT. It is suggested that the fluid from deep underground may migrate along the fractures or faults related to the movements of the mud volume.; The sea bottom temperature offshore southwestern Taiwan

Chiang, H.; Shyu, C.; Peng, Y.; Chang, H.; Chen, S.; Chung, S.; Wang, Y.

2012-12-01

371

Ghana seeks to resume offshore production  

SciTech Connect

Ghana National Petroleum Corp. (GNPC) plans a two well offshore drilling program it hopes will lead to a resumption of hydrocarbon production in the West African state. The wells will be drilled in South Tano field in the extreme western sector of Ghana's offshore area, near the boundary with Ivory Coast. If the program is successful, the state company will develop a novel floating production system to handle and export oil. Gas will provide fuel for an electrical power generating unit integrated into a floating production system. Power will move ashore through a submarine cable. North and south Tano fields were discovered by Phillips Petroleum Corp., which relinquished the acreage in 1982. The South Tano discovery well flowed 1,614 b/d of oil and 8.2 MMCfd of gas. Studies by a unit of ARCO, when it was a partner in a group that later acquired the Tano block, pegged North Tano hydrocarbons in place at 53.6 million bbl of oil and 102 bcf of gas. Braspetro, under contract with GNPC, estimated South Tano hydrocarbons in place at 82 million bbl of oil and 100 bcf of gas. GNPC is evaluating the possibility of rehabilitating Saltpond oil field about 150 miles east-northeast of North and South Tano. Saltpond has been shut in since 1985.

Not Available

1991-06-17

372

Nonlinear system identification in offshore structural reliability  

SciTech Connect

Nonlinear forces acting on offshore structures are examined from a system identification perspective. The nonlinearities are induced by ocean waves and may become significant in many situations. They are not necessarily in the form of Morison`s equation. Various wave force models are examined. The force function is either decomposed into a set of base functions or it is expanded in terms of the wave and structural kinematics. The resulting nonlinear system is decomposed into a number of parallel no-memory nonlinear systems, each followed by a finite-memory linear system. A conditioning procedure is applied to decouple these linear sub-systems; a frequency domain technique involving autospectra and cross-spectra is employed to identify the linear transfer functions. The structural properties and those force transfer parameters are determine with the aid of the coherence functions. The method is verified using simulated data. It provides a versatile and noniterative approach for dealing with nonlinear interaction problems encountered in offshore structural analysis and design.

Spanos, P.D. [Rice Univ., Houston, TX (United States); Lu, R. [Hudson Engineering Corporation, Houston, TX (United States)

1995-08-01

373

Job stress, mental health, and accidents among offshore workers in the oil and gas extraction industries.  

PubMed

Psychosocial and occupational stressors among 194 male employees on drilling rig and production platform installations in the United Kingdom and Dutch sectors of the North Sea were studied. Mental well-being and job satisfaction were also assessed, with attention to the incidence of accidents offshore. This occupational group were found to be much less satisfied with their jobs than their onshore counterparts. Although overall mental well-being compared favorably with that of the general population, levels of anxiety were significantly higher. Multivariate analysis showed "relationships at work and at home" to be a strong predictor of both job dissatisfaction and mental ill-health. Type A coronary-prone behavior was also found to be a significant predictor of reduced mental well-being and increased accident rates offshore. PMID:3819891

Cooper, C L; Sutherland, V J

1987-02-01

374

Tailor-made sugar jackets to stop cancerous growth -The Times of India http://web.mit.edu/tox/sasisekharan/toi.html 1 of 2 7/28/2005 9:49 PM  

E-print Network

Tailor-made sugar jackets to stop cancerous growth - The Times of India http://web.mit.edu/tox/sasisekharan/toi.html 1 of 2 7/28/2005 9:49 PM THURSDAY, JANUARY 24, 2002 THE TIMES OF INDIA HEALTH/SCIENCE POWERED BY INDIATIMES Search in The Times of India Web Indian Sites Advanced search Indiatimes > The Times of India

Sasisekharan, Ram

375

46 CFR 108.187 - Ventilation for brush type electric motors in classified spaces.  

...Ventilation for brush type electric motors in classified spaces. 108...A-MOBILE OFFSHORE DRILLING UNITS DESIGN AND EQUIPMENT Construction...Ventilation for brush type electric motors in classified spaces. Ventilation for brush type electric motors in classified locations...

2014-10-01

376

46 CFR 174.080 - Flooding on self-elevating and surface type units.  

...SUBDIVISION AND STABILITY SPECIAL RULES PERTAINING TO SPECIFIC VESSEL TYPES Special Rules Pertaining to Mobile Offshore Drilling Units § 174.080 Flooding on self-elevating and surface type units. (a) On a surface type...

2014-10-01

377

Integrated natural-gas-engine cooling-jacket vapor-compressor program. Annual progress report (Phase 1B) January-December 1986  

SciTech Connect

A unique, alternative cogeneration system was designed that will provide an industrial or commercial energy user with high-pressure steam and electricity directly from a packaged cogeneration system. The Integrated Gas Engine Vapor Compression System concept includes an engine-generator set and a steam screw compressor mechanically integrated with the engine. The gas-fueled engine is ebulliently cooled, thus allowing its water jacket heat to be recovered in the form of low-pressure steam. The steam is then compressed by the steam compressor to a higher pressure, and when combined with the high-pressure steam generated in the engine's exhaust gas boiler it provides the end user with a more-usable thermal-energy source.

DiBella, F.A.; Becker, F.; Balsavich, J.

1987-01-01

378

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

USGS Publications Warehouse

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.

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

2011-01-01

379

Offshore structure and method of sinking same  

SciTech Connect

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.

Fern, D. T.

1985-02-05

380

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.

381

Storage of carbon dioxide in offshore sediments.  

PubMed

The battle to reduce greenhouse gas emissions and prevent the most dangerous consequences of climate change will be waged across multiple fronts, including efforts to increase energy efficiency; efforts to deploy nonfossil fuel sources, including renewable and nuclear energy; and investment in adaptation to reduce the impacts of the climate change that will occur regardless of the actions we take. But with more than 80% of the world's energy coming from fossil fuel, winning the battle also requires capturing CO2 from large stationary sources and storing that CO2 in geologic repositories. Offshore geological repositories have received relatively little attention as potential CO2 storage sites, despite their having a number of important advantages over onshore sites, and should be considered more closely. PMID:19779191

Schrag, Daniel P

2009-09-25

382

Recent advances in offshore pipeline technology  

SciTech Connect

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.

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

1994-12-31

383

Lifting equipment for an offshore construction  

SciTech Connect

An offshore construction in which a floatable platform is supported through raisable and lowerable support legs directly or indirectly on the sea bed. At least two cable winches for each support leg are arranged as lifting equipment on the platform. One cable winch is connected through a single cable line with the lower end of a support leg. The other cable winch displays a multiple cable line guided around two pulley blocks. One of these pulley blocks is arranged on the support leg. In order to be able to employ the lifting equipment even in the case of great support leg lengths, the other pulley block is arranged on a ring. This ring surrounds the support leg and is detachably connected through a locking device with the platform.

Mayr, H.

1984-01-24

384

Proceedings of OMAE2008: The 27th International Conference on Offshore Mechanics & Arctic Engineering  

E-print Network

instrumented several of them on a number of mobile offshore drilling units (MODUs) and offshore production integrity for offshore drilling risers. This effort has included in-situ, full- scale monitoring of drillingProceedings of OMAE2008: The 27th International Conference on Offshore Mechanics & Arctic

385

American Institute of Aeronautics and Astronautics Aeroelastic Modeling of Large Offshore Vertical-axis Wind  

E-print Network

Vertical-axis Wind Turbines: Development of the Offshore Wind Energy Simulation Toolkit Brian C. Owens The availability of offshore wind resources in coastal regions makes offshore wind energy an attractive opportunity. There are, however, significant challenges in realizing offshore wind energy with an acceptable cost

386

California offshore wind energy potential Michael J. Dvorak a,*, Cristina L. Archer b  

E-print Network

California offshore wind energy potential Michael J. Dvorak a,*, Cristina L. Archer b , Mark Z December 2009 Keywords: Offshore wind energy California Resource assessment MM5 Bathymetry Mesoscale offshore buoys with high- resolution bathymetry to create a wind energy resource assessment for offshore

387

Method for computing efficient electrical indicators for offshore wind turbine monitoring  

E-print Network

Method for computing efficient electrical indicators for offshore wind turbine monitoring Georgia.cablea, pierre.granjon, christophe.berenguer} @gipsa-lab.grenoble-inp.fr Abstract Offshore wind turbines by offshore deployment of wind farms. The offshore turbines have much lower accessibility(1) so maintenance

Paris-Sud XI, Université de

388

Proceedings of the fifth international offshore mechanics and Arctic engineering (OMAE) symposium. Volume 4  

SciTech Connect

This book presents the papers given at a symposium on offshore platforms. Topics considered at the symposium included climates, Arctic regions, hydrate formation, the buckling of heated oil pipelines in frozen ground, icebergs, concretes, air cushion vehicles, mobile offshore drilling units, tanker ships, ice-induced dynamic loads, adfreeze forces on offshore platforms, and multiyear ice floe collision with a massive offshore structure.

Lunardini, V.J.; Wang, Y.S.; Ayorinde, O.A.; Sodhi, D.V.

1986-01-01

389

Incorporating Irregular Nonlinear Waves in Coupled Simulation of Offshore Wind Turbines  

E-print Network

, and Environmental Engineering The University of Texas, Austin, TX 78712 Design of an offshore wind turbine requires for design of offshore wind turbines. Response of an offshore wind turbine to the input wind and waves, bothIncorporating Irregular Nonlinear Waves in Coupled Simulation of Offshore Wind Turbines Puneet

Manuel, Lance

390

Time Dependent Fluid Occurrence Offshore Taiwan  

NASA Astrophysics Data System (ADS)

Time Dependent Fluid Occurrence Offshore Taiwan Liwen Chenab, Wu-Cheng Chia, Char-Shine Liuc (mma@earth.sinica.edu.tw)(wchi@gate.sinica.edu.tw) ; aInstitute of Earth Sciences, Academia Sinica, Taipei, Taiwan bInstitute of Geosciences, National Taiwan University, Taipei, Taiwan ; cInstitute of Oceanography, National Taiwan University, Taipei, Taiwan Earthquake-induced groundwater flows have been observed recently. Such fluid flow might temporarily change the temperature field in the crust. Here we used seismically detected gas hydrate under seafloor to study the temperature fields at a few hundred meters subbottom depth before, and after the 2006 Henchuan earthquake (Mw7.0). We used the hydrate-related bottom-simulating-reflector (BSR) in seismic profiles to study the effects of gas/fluid migration on the BSR attributes. We have conducted two seismic experiments before and after the earthquake across the same transects near the hypocenter of the earthquake using similar air gun arrays and streamers. By analyzing this unique dataset, we found enhanced BSR reflectivity in average after the earthquake (~0.03), but the Sea-floor reflectivity is very similar (~0.5). We also found changed amplitudes versus offset (AVO) in the dataset (the gradient of reflection coefficient versus the angles was ~-0.34). We interpret these results as a consequence of earthquake-induced gas and fluid migration, bringing the gases underneath the BSR, thus the enhanced reflection coefficients. Next we will explore new methods to use the BSR as a flow meter. Using time-dependent seismic attribute analyses across transects before and after a large earthquake, we found strong evidences of earthquake-related fluid migrations and possibly associated temperature perturbations. This is among the first studies to document such feature in the offshore region.

Chen, L.

2010-12-01

391

26th annual offshore technology conference, 1994 proceedings  

SciTech Connect

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.

Not Available

1994-01-01

392

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

SciTech Connect

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.

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

2014-01-01

393

Motion performance and mooring system of a floating offshore wind turbine  

NASA Astrophysics Data System (ADS)

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.

Zhao, Jing; Zhang, Liang; Wu, Haitao

2012-09-01

394

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

NASA Astrophysics Data System (ADS)

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.

Fall, K. A.; Wren, A.

2008-12-01

395

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

NASA Astrophysics Data System (ADS)

Tension leg platform (TLP) for offshore wind turbine support is a new type structure in wind energy utilization. The strong-interaction method is used in analyzing the coupled model, and the dynamic characteristics of the TLP for offshore wind turbine support are recognized. As shown by the calculated results: for the lower modes, the shapes are water's vibration, and the vibration of water induces the structure's swing; the mode shapes of the structure are complex, and can largely change among different members; the mode shapes of the platform are related to the tower's. The frequencies of the structure do not change much after adjusting the length of the tension cables and the depth of the platform; the TLP has good adaptability for the water depths and the environment loads. The change of the size and parameters of TLP can improve the dynamic characteristics, which can reduce the vibration of the TLP caused by the loads. Through the vibration analysis, the natural vibration frequencies of TLP can be distinguished from the frequencies of condition loads, and thus the resonance vibration can be avoided, therefore the offshore wind turbine can work normally in the complex conditions.

Huang, Hu; Zhang, She-Rong

2011-03-01

396

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

SciTech Connect

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.

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

2011-12-01

397

49 CFR 195.57 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

398

49 CFR 191.27 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

399

49 CFR 195.57 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

400

49 CFR 195.57 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2010 CFR

...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...

2010-10-01

401

49 CFR 191.27 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2013 CFR

...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...

2013-10-01

402

49 CFR 191.27 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2010 CFR

...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...

2010-10-01

403

49 CFR 191.27 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2011 CFR

...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...

2011-10-01

404

49 CFR 195.57 - Filing offshore pipeline condition reports.  

Code of Federal Regulations, 2012 CFR

...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...

2012-10-01

405

Coupled Dynamic Analysis of Multiple Unit Floating Offshore Wind Turbine  

E-print Network

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...

Bae, Yoon Hyeok

2013-04-23

406

Multi-hazard Reliability Assessment of Offshore Wind Turbines  

E-print Network

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...

Mardfekri Rastehkenari, Maryam 1981-

2012-12-04

407

Articulation Work in Small-Scale Offshore Software Development Projects  

E-print Network

Articulation Work in Small-Scale Offshore Software Development Projects Alexander Boden Institute. Such practices can be described as a combination of formal coordination and informal articulation work competencies when neglecting articulation work and hint at mismatches between scientific recommendations

408

"Design of Offshore Wind Turbines for Hurricane Resilience" Graduate Seminar  

E-print Network

"Design of Offshore Wind Turbines for Hurricane Resilience" Graduate Seminar Thursday, December 5 of designing a Convention Center Hotel in an Urban Setting " Undergraduate Seminar Tuesday October 08, 2013, 12

Connor, Ed

409

Homopolar pulse welding for offshore deep water pipelines  

SciTech Connect

Homopolar pulse welding (HPW) is a one-shot resistance welding process being investigated as a method to join API 5L carbon steel line pipe. Homopolar pulse welding utilizes the high current, low voltage electrical pulse produced by a homopolar generator to rapidly resistance heat the interface between abutting pipe ends, producing a full circumference resistance forge weld requiting no filler metal in under three seconds. A five year joint industry program is sponsoring HPW research with the goal of developing the process for deep water offshore pipeline construction utilizing the J-lay method The first two years of the program have concentrated on weld parameter optimization by producing, testing, and evaluating welds in various grades, wall thicknesses, types and compositions of 3 inch nominal (3.5 inch OD) diameter API 5L carbon steel pipe. Mechanical properties of the welds and parent metal were evaluated by tensile testing, impact testing, and hardness traverse testing according to guidelines and criteria established by the industrial sponsors. Homopolar pulse welding has demonstrated the capability to produce industrially acceptable full circumference welds in carbon steel line pipe via a rapid, one-shot process. Future work will concentrate on developing the process for commercial field installation, with the program`s goal being the demonstration of a prototype system for producing HPW welds in 12 inch diameter pipe in a J-lay configuration.

Haase, P.W.; Carnes, R.W.; Hudson, R.S. [Univ. of Texas, Austin, TX (United States). Center for Electromechanics

1995-12-31

410

Evaluating Shoreline Response to Offshore Sand Mining for Beach Nourishment  

Microsoft Academic Search

KELLEY, S.W.; RAMSEY, J.S., and BYRNES, M.R., 2004. Evaluating shoreline response to offshore sand mining for beach nourishment. Journal of Coastal Research, 20(1), 89-100. West Palm Beach (Florida), ISSN 0749-0208. An analytical approach that incorporates analysis of nearshore wave transformation and wave-induced longshore sediment transport was developed to quantify the significance of potential physical environmental impacts associated with offshore sand

Sean W. Kelley; John S. Ramsey; Mark R. Byrnes

2004-01-01

411

Evaluation of offshore stocking of Lake Trout in Lake Ontario  

USGS Publications Warehouse

Restoration stocking of hatchery-reared lake trout Salvelinus namaycush has occurred in Lake Ontario since 1973. In U.S. waters, fish stocked through 1990 survived well and built a large adult population. Survival of yearlings stocked from shore declined during 1990–1995, and adult numbers fell during 1998–2005. Offshore stocking of lake trout was initiated in the late 1990s in response to its successful mitigation of predation losses to double-crested cormorants Phalacrocorax auritus and the results of earlier studies that suggested it would enhance survival in some cases. The current study was designed to test the relative effectiveness of three stocking methods at a time when poststocking survival for lake trout was quite low and losses due to fish predators was a suspected factor. The stocking methods tested during 2000–2002 included May offshore, May onshore, and June onshore. Visual observations during nearshore stockings and hydroacoustic observations of offshore stockings indicated that release methods were not a direct cause of fish mortality. Experimental stockings were replicated for 3 years at one site in the southwest and for 2 years at one site in the southeast. Offshore releases used a landing craft to transport hatchery trucks from 3 to 6 km offshore out to 55–60-m-deep water. For the southwest site, offshore stocking significantly enhanced poststocking survival. Among the three methods, survival ratios were 1.74 : 1.00 : 1.02 (May offshore : May onshore : June onshore). Although not statistically significant owing to the small samples, the trends were similar for the southeast site, with survival ratios of 1.67 : 1.00 : 0.72. Consistent trends across years and sites indicated that offshore stocking of yearling lake trout during 2000–2002 provided nearly a twofold enhancement in survival; however, this increase does not appear to be great enough to achieve the 12-fold enhancement necessary to return population abundance to restoration targets.

Lantry, B.F.; O'Gorman, R.; Strang, T.G.; Lantry, J.R.; Connerton, M.J.; Schanger, T.

2011-01-01

412

Offshore LNG (liquefied natural gas) production and storage systems  

Microsoft Academic Search

A barge, outfitted with gas liquefaction processing equipment and liquefied natural gas (LNG) storage tanks, is suggested as a possible way to exploit remote offshore gas production. A similar study with a barge-mounted methanol plant was conducted several years ago, also using remote offshore feed gas. This barge-mounted, LNG system is bow-moored to a single point mooring through which feed

Barden

1982-01-01

413

Offshore oil production not significant polluter, says government report  

Microsoft Academic Search

Only 0.0028% of the oil produced in the Gulf of Mexico from 1971 through 1975 was spilled. World-wide, natural seeps introduce nearly 7 times more oil into the sea than offshore activity, while transportation, the worst offender, puts in 25 times more than offshore oil. The report includes data for spills of 50 bbl or less; about 85.5% of the

Danenberger

1977-01-01

414

[Spectral response analysis of offshore thin oil slicks].  

PubMed

Hyperspectral data of thin oil slicks have some spectral response characteristics, and an experiment of offshore thin oil slicks was designed to measure and analyze their reflectance by using ASD hyperspectral instrument. With the oil slick thickness changing, its color varied from rainbow sheen slick to fuchsine sheen slick, kelly sheen slick, aqua sheen slick, silver sheen slick and light sheen slick. The result suggested that different thin oil slicks have different characteristics, some thin oil slicks could change the reflectance at 440 nm which is the spectral absorption peak value of chlorophyll, and the best hyperspectral band to distinguish the different offshore thin oil slicks is located in the range between 350 and 440 nm. The reflectance of thin oil slicks is higher than that of seawater in the hyperspectral data range from 440 to 900 nm, but has no absorption or reflection characteristics compared to seawater's. It could not be detected in the range of near infrared from 900 to 2,500 nm of offshore thin oil slicks because of high noise, low signal and influence of the atmosphere. Finally, the spectral response theory of offshore thin oil slicks was analyzed, and the results indicated that the interference phenomenon of offshore thin oil slicks could add reflected light and change the reflectance of seawater, hence, increase the feasibility of offshore oil slick remote sensing. PMID:19626887

Lu, Ying-cheng; Tian, Qing-jiu; Qi, Xiao-ping; Wang, Jing-jing; Wang, Xiang-cheng

2009-04-01

415

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

USGS Publications Warehouse

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.

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

1997-01-01

416

Offshore oil and gas pipeline technology  

SciTech Connect

This volume is a ''total-systems'' approach to offshore pipeline design, operation, and maintenance. The volume comprises 17 contributed sections reviewing the most important developments in the field over the last few years. The contributors are all internationally recognized experts, and the papers present a broad yet complete review of all aspects of pipeline integrity. Although each topic is treated in depth, the work has been edited with both beginning engineers and experts in mind. Contents include: Deepwater soil analysis for pipelines. The buckling of submarine pipelines. Pipelines lay-stress analysis. Advances in submarine pipeline trenching by ploughing. The remove connection of submarine pipelines. Controlling the internal corrosion of pipelines. Controlling the external corrosion of pipelines using cathodic protection. Pipeline stability and spanning. Pipeline span detection, assessment and correction. Recent developments in pipeline inspection by side-scan sonar. Pipeline safety analysis. Pipeline reliability. A case in pipeline design. Riser design. The operation of gaslines at high pressure. Single point mooring systems-an alternative to pipelines.

Mare, R.F.

1985-01-01

417

Gas lift systems make ideal offshore workers  

SciTech Connect

With a low initial installation cost and small footprint, gas lift systems are well suited for offshore installations where compressed gas is usually already available. These systems are used on multiple and slimhole completions and handle sandy conditions well. They are also used to kick off wells that will flow naturally once the heavier completion fluids leave the production string. Gas lift itself is a mature workaday technology. Measurement and control of gas flow is an area of intense development in gas lift technology. One new control method involves production of multiple completions through a single wellbore. Typically, gas lift valves are opened and closed through tubing pressure. But downhole measurement technology does not yet yield information good enough for stable gas lift control of multiple completions. Gas lift is proving to be a useful AL technique in conjunction with electric submersible pumps (ESP). Located above the ESP pump, the gas lift can reduce the head and allow greater flow. This is helpful when small casing restricts the size of the downhole ESP pump. Wells can usually be produced by the gas lift alone in case of ESP failure, or by replacing the ESP where schedules, high repair costs or low prices rule out repair.

NONE

1999-05-01

418

Fluid additive and specialized PDC bits improve ROP in offshore applications  

SciTech Connect

Improving drilling rates of penetration (ROP) has always been a concern of operators in the oil and gas industry. This concern is increasingly prevalent as costs associated with drilling in challenging offshore environments continue to rise, which increases the impact of ROP improvements on overall project economics. Factors such as drilling fluid, bit design, hydraulics, weight on bit, rotary speed and bit balling affect a well`s overall ROP. This article focuses on two of the factors: drilling fluid type and bit selection.

Jones, T.A.

1997-02-01

419

A fuzzy definition of fatigue failure and reliability assessment for tubular joints of offshore structures  

SciTech Connect

In safety assessment of engineering structures, vagueness type uncertainties exist in defining certain structural performances, conditions, parameters and their inter-relationships. In this paper, based on the theory of fuzzy gets, a fuzzy definition of fatigue failure is introduced into fatigue reliability assessment for tubular joints of offshore structures. Based on the fuzzy failure definition together with the lognormal format for fatigue reliability assessment of tubular joints, the probability of fatigue failure is estimated. The principles described in this paper also apply to fatigue reliability assessment of other structures or structural reliability assessment related to failure states other than fatigue failure.

Hu, Y.; Chen, B. [Shanghai Jiao Tong Univ., Shanghai (China). Dept. of Naval Architecture and Ocean Engineering

1994-12-31

420

Sensitivity Analysis of Offshore Wind Cost of Energy (Poster)  

SciTech Connect

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.

Dykes, K.; Ning, A.; Graf, P.; Scott, G.; Damiami, R.; Hand, M.; Meadows, R.; Musial, W.; Moriarty, P.; Veers, P.

2012-10-01

421

30 CFR 250.417 - What must I provide if I plan to use a mobile offshore drilling unit (MODU)?  

Code of Federal Regulations, 2013 CFR

...plan to use a mobile offshore drilling unit (MODU)? 250...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND...SHELF Oil and Gas Drilling Operations Applying...plan to use a mobile offshore drilling unit (MODU)?...

2013-07-01

422

30 CFR 250.417 - What must I provide if I plan to use a mobile offshore drilling unit (MODU)?  

Code of Federal Regulations, 2012 CFR

...plan to use a mobile offshore drilling unit (MODU)? 250...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND...SHELF Oil and Gas Drilling Operations Applying...plan to use a mobile offshore drilling unit (MODU)?...

2012-07-01

423

30 CFR 250.417 - What must I provide if I plan to use a mobile offshore drilling unit (MODU)?  

Code of Federal Regulations, 2011 CFR

...plan to use a mobile offshore drilling unit (MODU)? 250...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND...SHELF Oil and Gas Drilling Operations Applying...plan to use a mobile offshore drilling unit (MODU)?...

2011-07-01

424

30 CFR 250.417 - What must I provide if I plan to use a mobile offshore drilling unit (MODU)?  

...plan to use a mobile offshore drilling unit (MODU)? 250...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND...SHELF Oil and Gas Drilling Operations Applying...plan to use a mobile offshore drilling unit (MODU)?...

2014-07-01

425

30 CFR 250.417 - What must I provide if I plan to use a mobile offshore drilling unit (MODU)?  

Code of Federal Regulations, 2010 CFR

...plan to use a mobile offshore drilling unit (MODU)? 250...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND...SHELF Oil and Gas Drilling Operations Applying...plan to use a mobile offshore drilling unit (MODU)?...

2010-07-01

426

Framework for assessing impacts of pile-driving noise from offshore wind farm construction on a harbour seal population  

E-print Network

Framework for assessing impacts of pile-driving noise from offshore wind farm construction Keywords: EU habitats directive Appropriate assessment Population consequences Disturbance Offshore wind farm Marine mammal Offshore wind farm developments may impact protected marine mammal populations

Aberdeen, University of

427

30 CFR 285.116 - Requests for information on the state of the offshore renewable energy industry.  

Code of Federal Regulations, 2011 CFR

...on the state of the offshore renewable energy industry. 285.116 Section...OF THE INTERIOR OFFSHORE RENEWABLE ENERGY ALTERNATE USES OF EXISTING...on the state of the offshore renewable energy industry. (a) The...

2011-07-01

428

30 CFR 585.116 - Requests for information on the state of the offshore renewable energy industry.  

Code of Federal Regulations, 2013 CFR

...on the state of the offshore renewable energy industry. 585.116 Section...OF THE INTERIOR OFFSHORE RENEWABLE ENERGY AND ALTERNATE USES OF EXISTING...on the state of the offshore renewable energy industry. (a)...

2013-07-01

429

30 CFR 585.116 - Requests for information on the state of the offshore renewable energy industry.  

Code of Federal Regulations, 2012 CFR

...on the state of the offshore renewable energy industry. 585.116 Section...OF THE INTERIOR OFFSHORE RENEWABLE ENERGY AND ALTERNATE USES OF EXISTING...on the state of the offshore renewable energy industry. (a)...

2012-07-01

430

30 CFR 285.116 - Requests for information on the state of the offshore renewable energy industry.  

Code of Federal Regulations, 2010 CFR

...on the state of the offshore renewable energy industry. 285.116 Section...OF THE INTERIOR OFFSHORE RENEWABLE ENERGY ALTERNATE USES OF EXISTING...on the state of the offshore renewable energy industry. (a)...

2010-07-01

431

30 CFR 585.116 - Requests for information on the state of the offshore renewable energy industry.  

...on the state of the offshore renewable energy industry. 585.116 Section...OF THE INTERIOR OFFSHORE RENEWABLE ENERGY AND ALTERNATE USES OF EXISTING...on the state of the offshore renewable energy industry. (a)...

2014-07-01

432

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

E-print Network

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...

Chen, Jieyan

2012-10-19

433

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

Federal Register 2010, 2011, 2012, 2013

...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...

2011-04-20

434

Sanaga Sud field - Offshore Cameroon, west Africa  

SciTech Connect

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.

Pauken, R.J. (Mobil New Exploration Ventures Co., Dallas, TX (USA))

1990-09-01

435

Comparing offshore wind farm wake observed from satellite SAR and wake model results  

NASA Astrophysics Data System (ADS)

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.

Bay Hasager, Charlotte

2014-05-01

436

Shift work at a modern offshore drilling rig.  

PubMed

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

Rodrigues, V F; Fischer, F M; Brito, M J

2001-12-01

437

Quantifying the hurricane risk to offshore wind turbines  

PubMed Central

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

Rose, Stephen; Jaramillo, Paulina; Small, Mitchell J.; Grossmann, Iris; Apt, Jay

2012-01-01

438

Detection of wind wakes offshore from satellite SAR  

NASA Astrophysics Data System (ADS)

A study is presented on the mapping of ocean wind fields for detection of wind wakes downstream of an offshore wind farm. The study is based on ERS-2 Synthetic Aperture Radar (SAR) scenes obtained in 2003 over Horns Reef in the North Sea. A large offshore wind farm (80 wind turbines) is located 14-20 km offshore of Denmark on this submerged reef. Meteorological observations are available from an offshore mast; wind speed is measured at four heights up to 62 m and wind direction is measured at 60 m. Maps of wind speed are generated from geophysical model functions (CMOD-4, CMOD-IFR2) with a resolution of 400 m by 400 m using wind direction obtained from in-situ measurements as model input. The wind maps display zones of reduced mean wind speed downstream of the wind farm compared to upwind conditions. The reduction is approximately 10 % immediately behind the wind farm and the wake effect is vanishing over distances in the order of 10 km downstream. This is consistent with wake model predictions. Satellite SAR provides a good estimate of the propagation of wind wakes. Information on how structures affect the local wind climate is useful for wind energy purposes, particularly for siting of future offshore wind farms.

Christiansen, M. B.; Hasager, C. B.

439

Quantifying the hurricane risk to offshore wind turbines.  

PubMed

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

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

2012-02-28

440

Investigation of Wind Turbine Rotor Concepts for Offshore Wind Farms  

NASA Astrophysics Data System (ADS)

Current plans in offshore wind energy developments call for further reduction of cost of energy. In order to contribute to this goal, several wind turbine rotor concepts have been investigated. Assuming the future offshore wind turbines will operate only in the offshore wind farms, the rotor concepts are not only evaluated for their stand-alone performances and their potential in reducing the loads, but also for their performance in an offshore wind farm. In order to do that, the 10MW reference wind turbine designed in Innwind.EU project is chosen as baseline. Several rotor parameters have been modified and their influences are investigated for offshore wind turbine design purposes. This investigation is carried out as a conceptual parametrical study. All concepts are evaluated numerically with BOT (Blade optimisation tool) software in wind turbine level and with Farmflow software in wind farm level for two wind farm layouts. At the end, all these concepts are compared with each other in terms of their advantages and disadvantages.

Ceyhan, Özlem; Grasso, Francesco

2014-06-01

441

Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam  

SciTech Connect

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.

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

442

Neogene sequence stratigraphy, Nam Con Son Basin, offshore Vietnam  

SciTech Connect

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.

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

443

Evidence of offshore lake trout reproduction in Lake Huron  

USGS Publications Warehouse

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.

DeSorcie, Timothy J.; Bowen, Charles A., II

2003-01-01

444

Proposing a Formalised Model for Mindful Information Systems Offshoring  

NASA Astrophysics Data System (ADS)

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.

Costello, Gabriel J.; Coughlan, Chris; Donnellan, Brian; Gadatsch, Andreas

445

Where the offshore search for oil and gas is headed  

SciTech Connect

This overview of the world's potential offshore oil and gas frontiers points out that although solutions to technical and political problems have opened up some promising areas for exploration, many key frontier basins have yet to be explored by modern technology. Long-standing disputes between bordering countries over offshore rights have deterred exploration activities in the Malvinas basin off Argentina and in the Gulf of Venezuela. Political problems have also slowed activity in the US Atlantic offshore, where Mesozoic reef trends may be related to Mexico's large oil fields. In Canada's Labrador Sea and Grand Banks, the problems are largely operational because of the inclement weather and threatening icebergs. The thick sediments off northern Norway remain untapped due to the deep water, Arctic conditions, and boundary disputes with the USSR. The main areas of active exploration are the Gulf of Thailand-Penyu-Natuna basin in Southeast Asia and Ireland's Porcupine Bight basin.

King, R.E.

1980-10-01

446

Thermodynamic design of natural gas liquefaction cycles for offshore application  

NASA Astrophysics Data System (ADS)

A thermodynamic study is carried out for natural gas liquefaction cycles applicable to offshore floating plants, as partial efforts of an ongoing governmental project in Korea. For offshore liquefaction, the most suitable cycle may be different from the on-land LNG processes under operation, because compactness and simple operation are important as well as thermodynamic efficiency. As a turbine-based cycle, closed Claude cycle is proposed to use NG (natural gas) itself as refrigerant. The optimal condition for NG Claude cycle is determined with a process simulator (Aspen HYSYS), and the results are compared with fully-developed C3-MR (propane pre-cooled mixed refrigerant) JT cycles and various N2 (nitrogen) Brayton cycles in terms of efficiency and compactness. The newly proposed NG Claude cycle could be a good candidate for offshore LNG processes.

Chang, Ho-Myung; Lim, Hye Su; Choe, Kun Hyung

2014-09-01

447

Offshore construction/LOOP (Louisiana Offshore Oil Port Inc. ) marine line system progressing  

SciTech Connect

A discussion of pipelines involved in the LOOP terminal i.e., the three 56 in. OD offloading pipelines, each 8000 ft long, that connect the three mooring systems and the pumping platform, and the 48 in. OD trunkline extending from the pumping platform 18 mi offshore to the Clovelly salt dome storage terminal near Galliano, La., covers the use of Grade X-60 line pipe; buckle arrestors; internal and external pipe coatings, including the 0.156 in. thick coal tar, glass mat reinforced corrosion protective coating on the 48 and 56 in. lines, which in addition were coated with concrete; and pipeline construction, including installation by the ETPM 1601 lay barge, and manual and automatic welding procedures.

Schultz, A.R.

1980-02-11

448

Proceedings of the seventh international conference on offshore mechanics and Arctic engineering  

SciTech Connect

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.

Chung, J.S.; Sparks, C.P.; Brekke, J.N.; Clukey, E.C.; Penney, T.R.

1988-01-01

449

46 CFR 11.540 - Endorsements as engineers of mobile offshore drilling units (MODUs).  

...2014-10-01 false Endorsements as engineers of mobile offshore drilling units (MODUs). 11.540 Section 11.540... § 11.540 Endorsements as engineers of mobile offshore drilling units (MODUs). Endorsements as chief...

2014-10-01

450

46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.  

Code of Federal Regulations, 2012 CFR

...2012-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping...11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer...

2012-10-01

451

46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.  

Code of Federal Regulations, 2011 CFR

...2011-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping...11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer...

2011-10-01

452

46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.  

Code of Federal Regulations, 2013 CFR

...2013-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping...11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer...

2013-10-01

453

46 CFR 11.540 - Endorsements for engineers of mobile offshore drilling units.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Endorsements for engineers of mobile offshore drilling units. 11.540 Section 11.540 Shipping...11.540 Endorsements for engineers of mobile offshore drilling units. Endorsements as chief engineer...

2010-10-01

454

75 FR 12734 - Taking and Importing Marine Mammals; Taking Marine Mammals Incidental to Operation of Offshore...  

Federal Register 2010, 2011, 2012, 2013

...include a continuation of drilling, production, and emergency...impacts of the planned offshore oil developments at...maintenance, and drilling, as well as vehicles...incidental to operation of offshore oil and gas facilities...production operations; drilling operations;...

2010-03-17

455

46 CFR 11.468 - National officer endorsements for mobile offshore drilling units (MODUs).  

... false National officer endorsements for mobile offshore drilling units (MODUs). 11.468 Section 11.468...468 National officer endorsements for mobile offshore drilling units (MODUs). Officer endorsements for...

2014-10-01

456

75 FR 39518 - National Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling; Correction  

Federal Register 2010, 2011, 2012, 2013

...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling; Correction AGENCY: Office of Fossil Energy, Department...Commission on the BP Deepwater Horizon Oil Spill and Offshore Drilling, (75 FR 37783). This document makes several...

2010-07-09

457

Proceedings of OMAE2006: International Conference on Offshore Mechanics and Arctic Engineering  

E-print Network

of wave measurements made from a gas-drilling platform in South Indian Ocean, offshore from Mossel BayProceedings of OMAE2006: 25th International Conference on Offshore Mechanics and Arctic Engineering

458

78 FR 73882 - Notice of Determination of No Competitive Interest, Offshore Virginia  

Federal Register 2010, 2011, 2012, 2013

...of No Competitive Interest, Offshore Virginia AGENCY: Bureau of Ocean...Outer Continental Shelf (OCS) Wind Energy Research Lease Offshore Virginia...research activities, including wind turbine installation and...

2013-12-09

459

Federal offshore statistics: 1992. Leasing, exploration, production, and revenues as of December 31, 1992  

SciTech Connect

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.

Francois, D.K.

1993-12-31

460

78 FR 66763 - Information Collection: Oil Spill Financial Responsibility for Offshore Facilities; Submitted for...  

Federal Register 2010, 2011, 2012, 2013

...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...

2013-11-06

461

75 FR 21648 - MMS Information Collection Activity: 1010-0106, Oil Spill Financial Responsibility for Offshore...  

Federal Register 2010, 2011, 2012, 2013

...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...

2010-04-26

462

78 FR 25472 - Information Collection: Oil Spill Financial Responsibility for Offshore Facilities; Proposed...  

Federal Register 2010, 2011, 2012, 2013

...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...

2013-05-01

463

78 FR 47723 - Information Collection: Forms for Oil Spill Financial Responsibility for Offshore Facilities...  

Federal Register 2010, 2011, 2012, 2013

...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...

2013-08-06

464

46 CFR 11.491 - Officer endorsements for service on offshore supply vessels.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 false Officer endorsements for service on offshore supply...SEAMEN REQUIREMENTS FOR OFFICER ENDORSEMENTS Professional Requirements for...Officers § 11.491 Officer endorsements for service on offshore...

2010-10-01

465

46 CFR 11.551 - Endorsements for service on offshore supply vessels.  

Code of Federal Regulations, 2010 CFR

...2010-10-01 2010-10-01 false Endorsements for service on offshore supply...SEAMEN REQUIREMENTS FOR OFFICER ENDORSEMENTS Professional Requirements for Engineer Officer § 11.551 Endorsements for service on offshore...

2010-10-01

466

Large-Scale Offshore Wind Power in the United States: Executive Summary  

SciTech Connect

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.

Musial, W.; Ram, B.

2010-09-01

467

Development of Offshore Wind Recommended Practice for U.S. Waters: Preprint  

SciTech Connect

This paper discusses how the American Petroleum Institute oil and gas standards were interfaced with International Electrotechnical Commission and other wind turbine and offshore industry standards to provide guidance for reliable engineering design practices for offshore wind energy systems.

Musial, W. D.; Sheppard, R. E.; Dolan, D.; Naughton, B.

2013-04-01

468

33 CFR 147.1106 - Exxon Santa Ynez offshore storage and treatment vessel mooring safety zone.  

Code of Federal Regulations, 2010 CFR

...offshore storage and treatment vessel mooring safety zone. 147.1106 Section 147.1106... OUTER CONTINENTAL SHELF ACTIVITIES SAFETY ZONES § 147.1106 Exxon Santa Ynez...offshore storage and treatment vessel mooring safety zone. (a) Description: The area...

2010-07-01

469

Floating offshore wind farms : demand planning & logistical challenges of electricity generation  

E-print Network

Floating offshore wind farms are likely to become the next paradigm in electricity generation from wind energy mainly because of the near constant high wind speeds in an offshore environment as opposed to the erratic wind ...

Nnadili, Christopher Dozie, 1978-

2009-01-01

470

Review of technology for Arctic offshore oil and gas recovery  

SciTech Connect

The technical background briefing report is the first step in the preparation of a plan for engineering research oriented toward Arctic offshore oil and gas recovery. A five-year leasing schedule for the ice-prone waters of the Arctic offshore is presented, which also shows the projected dates of the lease sale for each area. The estimated peak production rates for these areas are given. There is considerable uncertainty for all these production estimates, since no exploratory drilling has yet taken place. A flow chart is presented which relates the special Arctic factors, such as ice and permafrost, to the normal petroleum production sequence. Some highlights from the chart and from the technical review are: (1) in many Arctic offshore locations the movement of sea ice causes major lateral forces on offshore structures, which are much greater than wave forces; (2) spray ice buildup on structures, ships and aircraft will be considerable, and must be prevented or accommodated with special designs; (3) the time available for summer exploratory drilling, and for deployment of permanent production structures, is limited by the return of the pack ice. This time may be extended by ice-breaking vessels in some cases; (4) during production, icebreaking workboats will service the offshore platforms in most areas throughout the year; (5) transportation of petroleum by icebreaking tankers from offshore tanker loading points is a highly probable situation, except in the Alaskan Beaufort; and (6) Arctic pipelines must contend with permafrost, making instrumentation necessary to detect subtle changes of the pipe before rupture occurs.

Sackinger, W. M.

1980-08-01

471

Offshore Renewable Energy R&D (Fact Sheet)  

SciTech Connect

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.

Not Available

2011-10-01

472

Inner-shelf circulation and sediment dynamics on a series of shoreface connected ridges offshore of Fire Island, NY  

USGS Publications Warehouse

Locations along the inner-continental shelf offshore of Fire Island, NY, are characterized by a series of shoreface connected ridges (SFCRs). These sand ridges have approximate dimensions of 10 km in length, 3 km spacing, up to ~8 m ridge to trough relief, and are oriented obliquely at approximately 30 degrees clockwise from the coastline. Stability analysis from previous studies explains how sand ridges such as these could be formed and maintained by storm-driven flows directed alongshore with a key maintenance mechanism of offshore deflected flows over ridge crests and onshore in the troughs. We examine these processes both with a limited set of idealized numerical simulations and analysis of observational data. Model results confirm that along-shore flows over the SFCRs exhibit offshore veering of currents over the ridge crests and onshore-directed flows in the troughs, and demonstrate the opposite circulation pattern for a reverse wind. To further investigate these maintenance processes, oceanographic instruments were deployed at seven sites on the SFCRs offshore of Fire Island to measure water levels, ocean currents, waves, suspended-sediment concentrations, and bottom stresses from January to April 2012. Data analysis reveals that during storms with winds from the northeast the processes of offshore deflection of currents over ridge crests and onshore in the troughs were observed, and during storm events with winds from the southwest a reverse flow pattern over the ridges occurred. Computations of suspended-sediment fluxes identify periods that are consistent with SFCR maintenance mechanisms. Alongshore winds from the northeast drove fluxes offshore on the ridge crest and onshore in the trough that would tend to promote ridge maintenance. However, alongshore winds from the southwest drove opposite circulations. The wind fields are related to different storm types that occur in the region (low pressure systems, cold fronts, and warm fronts). From the limited data set we identify that low pressure systems drive sediment fluxes that tend to promote stability and maintain the SFCRs, while cold front type storms appear to drive circulations that are in the opposite sense and may not be a supporting mechanism for ridge maintenance.

Warner, John C.; List, Jeffrey H.; Schwab, William C.; Voulgaris, George; Armstrong, Brandy N.; Marshall, N

2014-01-01

473

Structural option design in JZ20-2 offshore project  

SciTech Connect

In the JZ20-2 Project, ice and earthquakes are the main loads which determine the member sizes of offshore structures. UQ and W platforms are located at same field. The vertical loads of an UQ platform are about two times as much as a W platform, but structural steel weight used by two platforms is about the same. This paper describes the results to be acquired and how to determine reasonably the standard of ice load and the resistance to earthquakes with less stiffness and large mass. This paper presents some useful principles and enlightenment for offshore engineering.

Wang Lianqi [COODEC, Beijing (China)

1993-12-31

474

A conceptual framework and practical guide for assessing fitness-to-operate in the offshore oil and gas industry.  

PubMed

The paper outlines a systemic approach to understanding and assessing safety capability in the offshore oil and gas industry. We present a conceptual framework and assessment guide for understanding fitness-to-operate (FTO) that builds a more comprehensive picture of safety capability for regulators and operators of offshore facilities. The FTO framework defines three enabling capitals that create safety capability: organizational capital, social capital, and human capital. For each type of capital we identify more specific dimensions based on current theories of safety, management, and organizational processes. The assessment guide matches specific characteristics to each element of the framework to support assessment of safety capability. The content and scope of the FTO framework enable a more comprehensive coverage of factors that influence short-term and long-term safety outcomes. PMID:24393216

Griffin, Mark A; Hodkiewicz, Melinda R; Dunster, Jeremy; Kanse, Lisette; Parkes, Katharine R; Finnerty, Dannielle; Cordery, John L; Unsworth, Kerrie L

2014-07-01

475

Tectonic wedging along the rear of the offshore Taiwan accretionary prism  

E-print Network

Tectonic wedging along the rear of the offshore Taiwan accretionary prism Wu-Cheng Chia,b,*, Donald the rear of the offshore Taiwan accretionary prism were studied using seismic reflection profiling and gravity modeling. Deformation between the offshore prism and forearc basin at the point of incipient

Chi, Wu-Cheng

476

TRANSMISSION OPTIONS FOR OFFSHORE WIND FARMS IN THE UNITED STATES Sally D. Wright, PE  

E-print Network

. The offshore gas and drilling industry uses lower power levels and low (under 10 kV) to medium voltage (10TRANSMISSION OPTIONS FOR OFFSHORE WIND FARMS IN THE UNITED STATES Sally D. Wright, PE Anthony L@ecs.umass.edu, rerl@ecs.umass.edu Abstract While offshore wind farms have been installed in Europe for over a decade

Massachusetts at Amherst, University of

477

OBSERVATIONS ON THE FISH FAUNA ASSOCIATED WITH OFFSHORE PLATFORMS IN THE NORTHEASTERN GULF OF MEXICO  

E-print Network

active only during the day, and others only at night. Offshore oil drilling platforms are known to atOBSERVATIONS ON THE FISH FAUNA ASSOCIATED WITH OFFSHORE PLATFORMS IN THE NORTHEASTERN GULF the summer and fall, but many species begin to move offshore or southward as the water temperature drops

478

Proceedings of the 27th International Conference on OFFSHORE MECHANICS AND ARTIC Engineering  

E-print Network

2008 June 15-20, 2008, Estoril, Portugal OMAE2008-57047 Offshore Drilling Riser VIV Suppression Devices operation in offshore drilling. Properly designed helical strakes are effective in the mitigation of VIVProceedings of the 27th International Conference on OFFSHORE MECHANICS AND ARTIC Engineering OMAE

479

Challenges in the reliability and maintainability data collection for offshore wind turbines  

Microsoft Academic Search

Wind energy is abundantly available both onshore and offshore. As a response to the present climate crisis focus on wind energy is increasing due to its renewable and environmentally friendly characteristics. Due to social and political reasons the trend has been shifted largely from onshore to offshore wind farms. Offshore wind energy production faces a wide range of new challenges

Z. Hameed; J. Vatn; J. Heggset

2011-01-01

480

MODULAR MULTI-LEVEL CONVERTER BASED HVDC SYSTEM FOR GRID CONNECTION OF OFFSHORE WIND  

E-print Network

MODULAR MULTI-LEVEL CONVERTER BASED HVDC SYSTEM FOR GRID CONNECTION OF OFFSHORE WIND POWER PLANT U off-shore wind power plants. The MMC consists of a large number of simple voltage sourced converter offshore wind power plants (WPP) because they offer higher energy yield due to a superior wind profile

Chaudhary, Sanjay

481

Investigations of migratory birds during operation of Horns rev offshore wind  

E-print Network

Investigations of migratory birds during operation of Horns rev offshore wind farm: Preliminary analyses of bird studies conducted during spring 2004 in relation to the offshore wind farm at Horns Rev of the Horns Rev offshore wind farm - preliminary note on the issue of potential habitat loss. Christensen, T

482

AN EVALUATION OF THE WILDLIFE IMPACTS OF OFFSHORE WIND DEVELOPMENT RELATIVE TO FOSSIL FUEL  

E-print Network

AN EVALUATION OF THE WILDLIFE IMPACTS OF OFFSHORE WIND DEVELOPMENT RELATIVE TO FOSSIL FUEL POWER. Jarvis All Rights Reserved #12;AN EVALUATION OF THE WILDLIFE IMPACTS OF OFFSHORE WIND DEVELOPMENT in offshore wind energy. I would also like to thank my committee members, Dr. Jeremy Firestone

Firestone, Jeremy

483

1 1 1 1 1 1 2 2 Network of offshore wind farms connected by  

E-print Network

2 33 3 3 1 1 1 1 1 1 2 2 Network of offshore wind farms connected by gas insulated transmission, Germany Corresponding author: anja.drews@forwind.de Offshore wind parks in different stages.Green- in op - unknown Source:Siemens Cross-section of a GIL (one of three phases) 1 Future offshore wind power What

Heinemann, Detlev

484

MAST628 Syllabus-8/12/2014 p. 1 Offshore Wind Power: Science, engineering, and policy  

E-print Network

MAST628 Syllabus- 8/12/2014 p. 1 Offshore Wind Power: Science, engineering, and policy MAST 628-4842, dveron@udel.edu, Robinson 114B Class web site with lecture notes: www.udel.edu/sakai UD offshore wind the multiple disciplines required to understand, plan, regulate, and develop offshore wind resources for large

Delaware, University of

485

From%laggard%to%leader:%% Explaining%offshore%wind%developments%in%  

E-print Network

From%laggard%to%leader:%% Explaining%offshore%wind%developments%in% the%UK% Florian!laggard!to!leader:!Explaining! offshore!wind!developments!in!the!UK! Florian Kern1* , Adrian Smith1 , Chris Shaw1 , Rob Raven2 and Bram for publication in Energy Policy, 19 Feb 2014 Abstract Offshore wind technology has recently undergone rapid

Sussex, University of

486

GEOL 663 -GEOLOGICAL ASPECTS OF OFFSHORE WIND COURSE SYLLABUS 2014 Fall Semester  

E-print Network

GEOL 663 - GEOLOGICAL ASPECTS OF OFFSHORE WIND COURSE SYLLABUS ­ 2014 Fall Semester Course Meets will be designed around geological and geotechnical topics that are relevant to the development of offshore wind wind turbine foundations; 2) A review of existing, or under construction, offshore wind projects; and 3

Delaware, University of

487

A MODULAR SHM-SCHEME FOR ENGINEERING STRUCTURES UNDER CHANGING CONDITIONS: APPLICATION TO AN OFFSHORE WIND  

E-print Network

TO AN OFFSHORE WIND TURBINE Moritz W. H¨ackell1, Raimund Rolfes1 1 Institute of Structural Analysis, Leibniz in common. A shift from fossil to renewable energy source is the logical con- sequence. (Offshore) wind : Offshore Wind Turbine, Machine Learning, Condition Parameter, Control Charts, Affinity Propagation

Paris-Sud XI, Université de

488

MODELLING THE VERTICAL WIND SPEED AND TURBULENCE INTENSITY PROFILES AT PROSPECTIVE OFFSHORE WIND FARM SITES  

E-print Network

MODELLING THE VERTICAL WIND SPEED AND TURBULENCE INTENSITY PROFILES AT PROSPECTIVE OFFSHORE WIND important for offshore wind energy utilisation are discussed and tested: Four models for the surface tested with data from the offshore field measurement Rødsand by extrapolating the measured 10 m wind

Heinemann, Detlev

489

EVALUATION OF MODELS FOR THE VERTICAL EXTRAPOLATION OF WIND SPEED MEASUREMENTS AT OFFSHORE SITES  

E-print Network

EVALUATION OF MODELS FOR THE VERTICAL EXTRAPOLATION OF WIND SPEED MEASUREMENTS AT OFFSHORE SITES important for offshore wind energy utilisation are discussed and tested: Four models for the surface that an important part of the future expansion of wind energy utilisation at least in Europe will come from offshore

Heinemann, Detlev

490

Analytical Modelling of Wind Speed Deficit in Large Offshore Wind Farms  

E-print Network

Analytical Modelling of Wind Speed Deficit in Large Offshore Wind Farms Sten Frandsen*, Rebecca areas.As is often the need for offshore wind farms, the model handles a regular array geometry for offshore wind farms, the model handles a priori a regular array geometry with straight rows of wind

Pryor, Sara C.

491

DATA NORMALIZATION FOR FOUNDATION SHM OF AN OFFSHORE WIND TURBINE : A REAL-LIFE CASE STUDY  

E-print Network

DATA NORMALIZATION FOR FOUNDATION SHM OF AN OFFSHORE WIND TURBINE : A REAL-LIFE CASE STUDY Wout the first results in the development of a SHM approach for the foun- dations of an offshore wind turbine the performance of the presented approach. KEYWORDS : Foundation Monitoring, Offshore Wind Turbine, Operational

Paris-Sud XI, Université de

492

www.cesos.ntnu.no Author Centre for Ships and Ocean Structures Offshore Wind Turbine Operation  

E-print Network

1 www.cesos.ntnu.no Author ­ Centre for Ships and Ocean Structures Offshore Wind Turbine Operation Structures Deep Water Offshore Wind Economic Production Cost WT Life Time : 20 Years Introduction Vast icing for offshore Wind Turbines ? · Wherever there is sea icing ! · Temperature bellow zero degree

Nørvåg, Kjetil

493

Short-term Forecasting of Offshore Wind Farm Production Developments of the Anemos Project  

E-print Network

Short-term Forecasting of Offshore Wind Farm Production ­ Developments of the Anemos Project J to the large dimensions of offshore wind farms, their electricity production must be known well in advance that the accuracies of wind speed predictions for the offshore sites Horns Rev and FiNO1 are similar or better than

Paris-Sud XI, Université de

494

A FETCH DEPENDENT MODEL OF SEA SURFACE ROUGHNESS FOR OFFSHORE WIND POWER UTILISATION  

E-print Network

A FETCH DEPENDENT MODEL OF SEA SURFACE ROUGHNESS FOR OFFSHORE WIND POWER UTILISATION Bernhard Lange, Resources, Roughness, Coastal Sea Areas, Waves, Rødsand 1 INTRODUCTION Large offshore wind farms are being wind conditions of offshore sites, since the higher energy yield has to compensate the additional

Heinemann, Detlev

495

Offshore wind resources from satellite SAR Charlotte Bay Hasager, Merete Bruun Christiansen, Morten Nielsen,  

E-print Network

Offshore wind resources from satellite SAR Charlotte Bay Hasager, Merete Bruun Christiansen, Morten ocean wind maps were described. For offshore wind resource estimation based on satellite observations and the near-coastal zone (up to 40 km offshore) is not mapped. In contrast, Envisat ASAR wind maps can

496

Influence of Nonlinear Irregular Waves on the Fatigue Loads of an Offshore Wind Turbine  

E-print Network

Influence of Nonlinear Irregular Waves on the Fatigue Loads of an Offshore Wind Turbine Michiel B-mail: michiel van.der.meulen@siemens.com Abstract. In order to make offshore wind power a cost effective load calculations by using a more advanced model for wave kinematics. As offshore wind turbines

Papalambros, Panos

497

From the SelectedWorks of George R. Parsons Valuing the Visual Disamenity of Offshore Wind  

E-print Network

From the SelectedWorks of George R. Parsons May 2011 Valuing the Visual Disamenity of Offshore Wind of Offshore Wind Power Projects at Varying Distances from the Shore: An Application on the Delaware Shoreline Andrew D. Krueger, George R. Parsons, and Jeremy Firestone ABSTRACT. Several offshore wind power projects

Delaware, University of

498

THE INFLUENCE OF WAVES ON THE OFFSHORE WIND Bernhard Lange, Jrgen Hjstrup*  

E-print Network

THE INFLUENCE OF WAVES ON THE OFFSHORE WIND RESOURCE Bernhard Lange, Jørgen Højstrup* Risø National and waves and thus in air-sea interaction in general. For predicting the offshore wind climate'8&7,21 The favourable wind resource at offshore compared to land sites is caused by the very low surface roughness

Heinemann, Detlev

499

Wind resources and wind farm wake effects offshore observed from satellite  

E-print Network

Wind resources and wind farm wake effects offshore observed from satellite Charlotte Bay Hasager to quantify the wake effect at two large offshore wind farms in Denmark. It is found that the wake velocity than for near-neutral conditions. Keywords: satellite, offshore wind resource, wake. 1 Introduction

500

The dynamics of the Mississippi River plume: Impact of topography, wind and offshore forcing  

E-print Network

The dynamics of the Mississippi River plume: Impact of topography, wind and offshore forcing), The dynamics of the Mississippi River plume: Impact of topography, wind and offshore forcing on the fate of topography, winddriven and eddydriven circulation on the offshore removal of plume waters. A realistically

Miami, University of