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A Framework for Reliability-Based Fatigue Safety Factors for Flexible Risers

[+] Author Affiliations
B. J. Leira

NTNU, Trondheim, Norway

K. A. Farnes, K. Nedrelid

Statoil Research Center, Trondheim, Norway

R. T. Igland

Marintek, Trondheim, Norway

J. Martin, D. Percy

BP Exploration Operating Company, Sunbury-on-Thames, UK

C. Lemos

Petrobras, Rio de Janeiro, Brazil

R. Clements

Wellstream International Ltd., Newcastle, UK

Paper No. OMAE2007-29487, pp. 603-611; 9 pages
doi:10.1115/OMAE2007-29487
From:
  • ASME 2007 26th International Conference on Offshore Mechanics and Arctic Engineering
  • Volume 1: Offshore Technology; Special Symposium on Ocean Measurements and Their Influence on Design
  • San Diego, California, USA, June 10–15, 2007
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4267-3 | eISBN: 0-7918-3799-8
  • Copyright © 2007 by ASME

abstract

In the present paper, a procedure for reliability analysis of wave-induced fatigue in the tensile and pressure armours of flexible risers is described. The procedure is based on performing a number of parametric studies with respect to variables that influence the fatigue lifetime. The results of these parametric studies are subsequently combined with models describing the statistical scatter of the same parameters. By application of this procedure, the safety factors which are required in order to reach specific target reliability levels can be computed. Different SN-curves which correspond to different corrosive environments are considered.

Copyright © 2007 by ASME

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