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TECHNICAL PAPERS

Assessment of Offshore Platforms Under Subsidence—Part I: Approach

[+] Author and Article Information
Joseph M. Gebara

Aker Engineering Inc., Houston, TX 77079

Dan Dolan

Bechtel Offshore, San Fransisco, CA 94142

Stuart Pawsey

Digital Structures, Berkeley, CA 94704

Philippe Jeanjean

BP Amoco Corporation, Houston, TX 77079

Knut Dahl-Stamnes

BP Amoco Norge AS, Stavanger, Norway

J. Offshore Mech. Arct. Eng 122(4), 260-266 (Apr 21, 2000) (7 pages) doi:10.1115/1.1313530 History: Received October 01, 1998; Revised April 21, 2000
Copyright © 2000 by ASME
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References

API Recommended Practice 2A-WSD (RP 2A-WSD), 1997, Recommended Practice for Planning, Designing and Constructing Fixed Offshore Platforms—Working Stress Design, 20th Edition, Supplement 1, February 1.
Kallaby J., Lee, G., Crawford, C., Light, L., Dolan, D., and Chen, J.H., “Structural Assessment of Existing Platforms” OTC 7483, Offshore Technology Conference Proceedings, May 1994.
Craig, M. J. K., and Digree, K.A., 1994, “Assessment of High Consequence Platforms: Issues and Applications,” OTC 7485. Offshore Technology Conference Proceedings, May.
Broughton, P., and Horn, E., 1987, “Ekofisk Platform 2/4C: Re-analysis due to Subsidence,” Proc, Instn Civ Engrs, Part 1, Vol. 82 Oct.
API RP 2A-WSD, 1997, 20th Edition Supplement 1, Dec., effective date: February 1.
Draft ISO Standard for Fixed Offshore Structures Section C—Design, Section 0 “In-Service Inspection and Structural Integrity Management” and Section R “Assessment of Existing Structures” and Section X “Modeling for Structural Analyses.”
Norwegian Petroleum Directorate, 1996, “Acts Regulations and Provisions for the Petroleum Activities—Volume 2,” Stavanger, Norway, March.
PMB Engineering, Inc., 1996 “Hurricane Andrew—Effects on Offshore Platforms,” Phase 2 Final Report to Joint Industry Project, San Francisco, California, Jan.
BOMEL, 1997, “Development of Best Practice Guidelines for Ultimate Strength Analysis Joint Industry Project, Ultiguide—Phase 1,” Final Report, Doc. No. C675/04/048R, Jan.
MSL Engineering, 1996, “Assessment Criteria, Reliability and Reserve Strength of Tubular Joints, Part 1: Recommendations and Commentary,” Doc. Ref. C14200R011, Rev 3, Mar.
Pawsey, S., Driver, D., Gebara, J., Bole J., and Westlake, H., 1998, “Characterization of Environmental Loads on Subsiding Offshore Platforms,” 17th International Conference on Offshore Mechanics and Arctic Engineering, Lisbon, Portugal, July.
Stahl, B., Aune, S., Gebara, J., and Cornell, C. A., 1998, “Acceptance Criteria for Offshore Platforms,” 17th International Conference on Offshore Mechanics and Arctic Engineering, Lisbon, Portugal, July.
Jha,  A. K., Kiciman,  O. K., Gebara,  J., Stahl,  B., and Dahl-Stamnes,  K., 2000, “Assessment of Offshore Platforms under Subsidence—Part II: Analysis and Results,” ASME J. Offshore Mech. Arct. Eng., 122, Nov., pp. 267–273.
Bea, R. G., Litton, R. W., Nour-Omid, S., and Chang, J. Y., 1984, PMB Systems Engineering, Inc., “A Specialized Design and Research Tool for the Modeling of Near-Field Pile-Soil Interactions,” 16th Offshore Technology Conference, May.
Jardine, R. J., and Chow, F. C., “New Design Methods for Offshore Piles,” MTD Publication 96/103.
Fugro Limited, 1997, “Foundation Re-evaluation Report. Valhall Field. Block 2/8, Norwegian Sector, North Sea,” Report 65144-1 to Amoco Norway Oil Company, Mar.
Kaplan, P., and Warier, S., 1997, “Analysis and Prediction of Wave Impact Forces on Valhall Field Offshore Platform Decks, Including Deck Equipment,” Report No. 97-104, prepared for Amoco Corporation.

Figures

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Valhall field—phase A
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Valhall Platform C analysis model
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Soil profile at Valhall PCP platform; average pile penetration is 43 m
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Comparison of friction profiles according to several design methods
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Comparison of tension capacity
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Main steps to a shutdown and evacuation procedure

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