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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

Mathisen, J., (1999), “Changes to DNV’s POSMOOR Rules, Based on the DEEPMOOR Project,” Seminar on Dynamic Positioning and Mooring of Floating Offshore Structures, Norwegian Soc. of Chartered Engineers, Sandefjord.
Okkenhaug, S., (2001), “DNV POSMOOR–New Edition 2001,” conference on Dynamic Positioning and Mooring of Floating Offshore Structures, Norwegian Society of Chartered Engineers, Kristiansand.
Sigurdsson, G., Lotsberg, I. & Landet, E., (2000), “Risk Based Inspection of FPSOs,” Int. Conf. on Offshore Mechanics and Arctic Engineering, OMAE’2000, New Orleans.
Det Norske Veritas, (2001), “Offshore Standard DNV-OS-E301, Position Mooring,” Høvik.
API, (1995), “Recommended Practice for Design and Analysis of Stationkeeping Systems for Floating Structures,” RP2SK, American Petroleum Institute, Washington D.C.
BSI (1999), “Guide on methods for assessing the acceptability of flaws in fusion welded structures,” BS 7910, British Standards Institution.
Pommier,  S., Sakae,  C., Murakami,  Y., 1999, “An empirical stress intensity factor set of equations for a semi-elliptical crack in a semi-infinite body subjected to a polynomial stress distribution,” Int. J. Fatigue, 21, pp. 243–251.
Klasén, B., Dillstrøm, P, (2001), private communication of results from stress analysis of a bar with flaws of various sizes.
Couroneau,  N., Royer,  J., 1998, “Simplified model for the fatigue growth analysis of surface cracks in round bars under mode I,” Int. J. Fatigue, 20(10), pp. 711–718.
Mathisen, J., Hørte, T., Moe, V., Lian, W., (1999), “DEEPMOOR–Design Methods for Deep water Mooring Systems, Calibration of a Fatigue Limit State,” Det Norske Veritas, report no. 98-3110, rev.no. 03, Høvik.
SESAM, (1996), “User’s Manual PROBAN General Purpose Probabilistic Analysis Program,” DNV Software report no. 92-7049, rev.no. 1, Høvik.
Førli, O., (2000), “RBI for Offshore Structures–Service Development, POD curves for electromagnetic NDT,” memo no. forl/00aaabx1, DNV Materials Technology and Laboratories RN530, Høvik.

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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