Risk based inspection methods have been used to develop a basis for an in-service inspection programme for the Jotun FPSO hull and topside structures with respect to fatigue cracks. Jotun is a floating production unit installed on the Jotun Field in the Norwegian Sector of the North Sea in 1999. The most critical hot spot areas' showing the shortest calculated fatigue lives have been selected for analyses. A fracture mechanics model is calibrated to the fatigue damage obtained from an S-N approach. Then the degree of accumulated fatigue damage at a hot spot can be assessed after an inspection where the crack size is a governing parameter for efficiency of the inspection. Based on information available at the design stage an optimal target failure probability is established to achieve an acceptance criterion for probability of a fatigue crack at time for planned in-service inspections. Costs associated with in-service inspection, possible repair and shutdown have been included to determine an optimal acceptance criterion. Details in the hull structure in the production area and the turret/moonpool of the main deck, ballast and cargo tanks, bottom and side shell structure and the moonpool have been investigated. The investigated details also include welded connections in the topside structures such as the flare tower, crane pedestals, process modules and helideck. Butt welds and fillet welds are investigated for the as welded and ground conditions as found in the fabricated structure. The time to first inspection and time interval between inspections for critical details is determined based on consequence of a fatigue crack, methods used for fabrication, reliability of in-service inspection and calculated fatigue life.


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    Titel :

    Risk-based inspection of an FPSO


    Beteiligte:
    Landet, E. (Autor:in) / Lotsberg, I. (Autor:in) / Sigurdsson, G. (Autor:in)


    Erscheinungsdatum :

    2000


    Format / Umfang :

    10 Seiten, 10 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





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