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On design criteria for a disconnectable FPSO mooring system associated with expected lifecycle cost

Cabrera-Miranda, JM; Sakugawa, PM; Corona-Tapia, R; Paik, JK; (2018) On design criteria for a disconnectable FPSO mooring system associated with expected lifecycle cost. Ships and Offshore Structures , 13 (4) pp. 432-442. 10.1080/17445302.2017.1412049. Green open access

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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.

Type: Article
Title: On design criteria for a disconnectable FPSO mooring system associated with expected lifecycle cost
Open access status: An open access version is available from UCL Discovery
DOI: 10.1080/17445302.2017.1412049
Publisher version: https://doi.org/10.1080/17445302.2017.1412049
Language: English
Additional information: © 2017 Informa UK Limited, trading as Taylor & Francis Group. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Disconnection criteria, FPSO, life-cycle cost, mooring system, target reliability index, ultimate limit state
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/10042494
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