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Fatigue Safety Factors for Flexible Risers Based on Case Specific Reliability Analysis

[+] Author Affiliations
Bernt J. Leira

NTNU, Trondheim, Norway

Ragnar T. Igland, Gro S. Baarholm

Marintek, Trondheim, Norway

Knut A. Farnes

Statoil Research Center, Trondheim, Norway

Dick Percy

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

Paper No. OMAE2005-67432, pp. 211-217; 7 pages
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 2
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4196-0 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME


In the present paper, fatigue safety factors for flexible risers are assessed. A procedure for reliability analysis of wave-induced fatigue is first 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. Such safety factors are computed for three specific flexible riser configurations. Different SN -curves which correspond to different corrosive environments are considered. The percentwise contribution from each parameter to the total statistical variation of the limit state function is also quantified.

Copyright © 2005 by ASME



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