[2017] On design criteria for a disconnectable FPSO mooring system associated with expected life-cycle cost > Selected Papers

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[2017] On design criteria for a disconnectable FPSO mooring system ass…

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Author Admin 작성일18-02-01 21:51 Hit880 Count Comments0 Count

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Ships and Offshore Structures, Vol.13(4), pp.432-442, 2018.

On design criteria for a disconnectable FPSO mooring system associated with expected life-cycle cost

Author(s): Jose Manuel Cabrera Miranda, Patricia Mika Sakugawa, Rafael Corona-Tapia, Jeom Kee Paik

Abstract:
Some floating production, storage and offloading units (FPSOs) possess disconnectable systems to avoid harsh environments. According to a literature survey, the practice is based on perceptions and experiences of operators to judge disconnection; however, this paper offers a rational approach. A life-cycle cost model is proposed to optimise (1) the disconnection criteria and (2) the design of mooring lines under reliability format. Relevant ultimate limit states are considered in association with hull, moorings and green water failure. Effects of future failure costs are considered (downtime, environmental damage, reputation, etc.). Disconnection criteria are then formulated in terms of significant wave height and wind speed limits. Because a permanent mooring system may exhibit excessive resistance, it is possible to reduce the lines’ thickness until the cost is optimised for non-permanent service. Results for an example in the Gulf of Mexico show that important savings can be achieved by implementing the proposed optimisations.

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