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A life-cycle cost model for the reliability-based design of disconnectable FPSO mooring lines

Cabrera-Miranda, JM; Sakugawa, PM; Corona-Tapia, R; Paik, JK; (2017) A life-cycle cost model for the reliability-based design of disconnectable FPSO mooring lines. In: Proceedings of the 2017 International Conference on Ships and Offshore Structures (ICSOS). International Conference on Ships and Offshore Structures (ICSOS): Shenzhen, China. Green open access

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Abstract

Floating production, storage, and offloading units (FPSOs) are widely used to develop offshore oil fields from shallow to ultra-deep waters, and some possess fast disconnection systems to avoid harsh environmental conditions. According to a literature survey, the current industry practice is based on the perceptions and experiences of operators to judge the disconnection of these units during cyclonic storms. However, systematic criteria should be established to judge whether disconnection is needed, and the downtime costs and safety issues associated with life-cycle costs should be considered. In this paper, a life-cycle cost model is proposed to optimize (1) the disconnection criteria of FPSOs and (2) the design of their mooring system. Relevant ultimate limit states and reliabilities are considered in association with hull collapse, mooring system failure, and green water impact failure. Effects of downtime costs (deferred production costs), mobilization, and other failure costs are considered. Disconnection criteria are then formulated in terms of the significant wave height and wind speed limits. Because a permanent mooring system may exhibit excessive resistance, it is possible to further optimize the life-cycle cost by reducing the system’s resistance until an optimum reliability is obtained, minimizing the costs for non-permanent service. An FPSO in the Gulf of Mexico is selected as an example to illustrate the application of the developed model. The results of this study show that important savings for an overall FPSO project can be achieved by implementing the proposed optimizations.

Type: Proceedings paper
Title: A life-cycle cost model for the reliability-based design of disconnectable FPSO mooring lines
Event: 2017 International Conference on Ships and Offshore Structures (ICSOS)
Location: Shenzhen, China
Dates: 11 September 2017 - 13 September 2017
Open access status: An open access version is available from UCL Discovery
Publisher version: http://www.icsos.info/proceedings/
Language: English
Additional information: 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
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/1563779
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