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Truss Spar Structural Design for West Africa Environment

[+] Author Affiliations
J. Wang, Y. H. Luo, R. Lu

CSO Aker Engineering, Inc., Houston, TX

Paper No. OMAE2002-28245, pp. 489-496; 8 pages
doi:10.1115/OMAE2002-28245
From:
  • ASME 2002 21st International Conference on Offshore Mechanics and Arctic Engineering
  • 21st International Conference on Offshore Mechanics and Arctic Engineering, Volume 1
  • Oslo, Norway, June 23–28, 2002
  • Conference Sponsors: Ocean, Offshore, and Arctic Engineering Division
  • ISBN: 0-7918-3611-8 | eISBN: 0-7918-3599-5
  • Copyright © 2002 by ASME

abstract

As the Truss Spar gains greater recognition by the offshore industry, it is expected that more Truss Spars will be built for deepwater oil and gas development not only for the Gulf of Mexico, but also for offshore West Africa, Brazil, and other deepwater fields. The offshore West Africa environment is known to have long-period swells with period in excess of 20 seconds although its 100-year extreme wave height and wind speed are significantly lower than those for the Gulf of Mexico. The long-period swells present unique challenges for structural design of the Truss Spar. In particularly, heave motions and structural fatigue caused by the swells can be significant and must be addressed early in the design process. A comparative study between a Truss Spar and a Classic Spar on global motions is provided in this paper. Inplace strength and fatigue performance is investigated using a generic Truss Spar model for both the Gulf of Mexico and West Africa environments. Motion RAOs, loads, structural strength and fatigue results are presented to illustrate the findings.

Copyright © 2002 by ASME

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