Journal
RELIABILITY ENGINEERING & SYSTEM SAFETY
Volume 93, Issue 9, Pages 1345-1353Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ress.2006.11.005
Keywords
common cause failures; reliability; safety barrier; safety instrumented system
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The paper gives an introduction to reliability assessment of reliquefaction systems for boil-off gas (BOG) on LNG carriers with focus on redundancy optimization and maintenance strategies. The reliability modeling is based on a time-dependent Markov approach. Four different system options are studied, with varying degree of redundancy. Failures in the ieliquefaction system may require flaring of the BOG, and the associated cost is compared with the cost of introducing redundancy and the cost of onboard maintenance. A model for maintenance optimization is developed and exemplified on a main unit of the reliquefaction system. Reliability and maintenance cost data for reliquefaction systems on LNG ships are very scarce. The input data have been collected from the best available data sources and adjusted by expert judgement. A tailor-made computer program has been developed and may be supplied to interested readers. (C) 2006 Elsevier Ltd. All rights reserved.
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