Reliability analysis and Response Based Design of a moored FPSO in West Africa

Type Article
Date 2013
Language English
Author(s) Fontaine E.1, Orsero P.2, Ledoux Annick3, Nerzic R.4, Prevosto MarcORCID5, Quiniou Valerie6
Affiliation(s) 1 : IFP Energies Nouvelles, Dept Appl Mech, F-92852 Rueil Malmaison, France.
2 : Univ Technol Compiegne, F-60203 Compiegne, France.
3 : Principia, F-13600 La Ciotat, France.
4 : Actimar, F-29200 Brest, France.
5 : IFREMER, Ctr Plouzane, F-29000 Brest, France.
6 : Total, F-92078 Paris, France.
Source Structural Safety (0167-4730) (Elsevier Science Bv), 2013 , Vol. 41 , P. 82-96
DOI 10.1016/j.strusafe.2012.08.002
WOS© Times Cited 26
Keyword(s) Environmental contour, Joint probabilities, Multivariate extremes, I-FORM, FPSO, West Africa, Structural reliability, Response-based design, Inverse reliability method, Response surface
Abstract The present study is an attempt to re-assess the level of reliability of the mooring system of an existing Floating Production Storage and Offloading (FPSO) unit in West Africa. The study made use of field data for the environment including wind, waves and current together with simultaneous measurements of the FPSO offset and of the mooring line tensions. Three different approaches to predict the extreme response are compared. More specifically, the traditional design method is compared with Response Based Design (RBD) and First Order Reliability Method (FORM) analysis associated with Response Surface Models (RSM) of the moored FPSO. The results of this case study allow assessing the level of conservatism that is currently embedded in classical design rules.
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