For offshore structures, risk and reliability based inspection planning (RBI) procedures have been developed and implemented since the 1980s, mostly for fatigue deterioration of fixed jacket steel structures, but more recently also for ship and floating production storage and offloading systems subject to corrosion and fatigue. While the significant computational efforts required by RBI hindered the applications in the past, this restriction has been resolved with the development of the generic approach to RBI, which facilitates the highly efficient application of RBI for portfolios of offshore structure. Although it has been observed that RBI in general reduces the amount of inspections considerably, the financial benefits of applying RBI strategies for offshore structures have not been systematically quantified in past publications. Furthermore, in the public domain little information is available on realistic estimates of costs related to the structural integrity management of these structures. In this paper, the factors influencing the costs of inspections and repairs are reviewed. Based on past experience, typical costs of different types of inspections and repair actions are presented for fixed and floating offshore steel structures, including FPSO's, subject to fatigue damages. Furthermore, the factors influencing the cost of a failure in the structure are discussed. On this basis, the financial benefits of performing risk based inspection planning are determined for some typical cases by comparing the associated expected costs with the expected cost of an inspection strategy with fixed, predefined inspection intervals. This assessment is based on the generic approach to RBI.
Benefits of risk based inspection planning for offshore structures
Vorteile einer risikobasierten Inspektionsplanung für Offshore-Anlagen
2006
10 Seiten, 15 Bilder, 2 Tabellen, 25 Quellen
Aufsatz (Konferenz)
Englisch
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