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TECHNICAL PAPERS

Risk-Based Inspection Planning for Mooring Chain

[+] Author and Article Information
Jan Mathisen

Det Norske Veritas, N-1322 Ho̸vik, Norwaye-mail: Jan.Mathisen@dnv.com

Kjell Larsen

Statoil, Forskningssenteret, Ranheimsvn. 10, N-7005 Trondheim, Norwaye-mail: klars@statoil.no

J. Offshore Mech. Arct. Eng 126(3), 250-257 (Sep 20, 2004) (8 pages) doi:10.1115/1.1782644 History: Received September 02, 2002; Revised December 03, 2003; Online September 20, 2004
Copyright © 2004 by ASME
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References

Figures

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Stress distribution over a cross-section through weld for an intact, studless link
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Linearization of stress distribution over a selected cross-section through an intact link
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Example of geometry function (for a straight flaw), compared to Couroneau (1998)
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Deterministic crack growth with initial crack depths 0.02, 0.03, 0.04 mm
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Latter part of deterministic crack growth with initial crack depth 0.02 mm
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Probability of detection curve, with lower limits for defect depth of 0 and 0.3 mm (using Burr’s distribution type)
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Probability of failure of a single link
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Probability of failure of a single link, conditional on inspection with no crack detected, at time ti1
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Comparison of accumulated probability of failure for a single link and a chain segment
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The effect of one inspection, with no-finds in all links, on the probability of failure, for inspections after 5, 10, 15, or 20 years
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The effect of two inspections, with no-finds in all links, on the probability of failure, for the second inspection after 14, 15, 16, or 17 years, with the first inspection after 13 years.
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Illustration of part of an inspection plan with a target probability of 10−3.
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Cost elements plotted against target level for failure to inspection cost ratio of 90
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Cost elements plotted against target level for failure to inspection cost ratio of 120
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Updated failure probability with cost-optimal inspection plan for failure to inspection cost ratio of 120
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Cost elements plotted against target level for failure to inspection cost ratio of 1500
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Updated failure probability with cost-optimal inspection plan for failure to inspection cost ratio of 1500

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