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TECHNICAL PAPERS

Probabilistic Inspection Planning of the Åsgard A FPSO Hull Structure With Respect to Fatigue

[+] Author and Article Information
Inge Lotsberg, Gudfinnur Sigurdsson

Det Norske Veritas AS, Offshore Installations/RN520, P.O. Box 300, 1322 Ho̸vik, Norway

Per Terje Wold

Statoil, Stjo̸rdal, Norway

J. Offshore Mech. Arct. Eng 122(2), 134-140 (Feb 11, 2000) (7 pages) doi:10.1115/1.533735 History: Received November 01, 1999; Revised February 11, 2000
Copyright © 2000 by ASME
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References

Lotsberg, I., Back-Gansmo, O., and Dalane, J. I., 1991, “Probabilistic Design of a Ship Type Floating Production Vessel,” 10th International Conference of Offshore Mechanics and Arctic Engineering. Stavanger, Norway.
Moan, T., and Song, R., 1998, “Implication of Inspection Updating on System Fatigue Reliability of Offshore Structures,” OMAE, Lisbon, Portugal.
Paris,  P. C., and Erdogan,  F., 1963, “A Critical Analysis of Crack Propagation Laws,” ASME J. Basic Eng., 85, pp. 528–534.
Raju,  I. S., and Newman,  J. C., 1981, “An Empirical Stress-Intensity Factor Equation for Surface Crack,” Eng. Fract. Mech., 15, pp. 185–192.
Madsen, H. O., Skjong, R., Tallin, A., and Kirkemo, F., 1987, “Probabilistic Fatigue Crack Growth Analysis of Offshore Structures, With Reliability Updating Through Inspection,” Marine Structural Reliability Symp., SNAME, Arlington VA.
PROBAN, 1996, “Theory Manual, General Purpose Probabilistic Analysis Program,” DNV Software Rep. 96-7017.
PROFAST Theory Manual, 1996, Probabilistic Fatigue Analysis System, DNV Sesam Report 95-7005.
Sigurdsson, G., Cramer, E. H., and Lotsberg, I., 1998, “Fatigue Assessment of Structures,” Industrial Application of Structural Reliability Theory, ESReDA Safety Series No. 2, Det Norske Veritas, ed. P. Thoft-Christensen, pp. 243–270.
Sigurdsson, G., Lotsberg, I., and Landet, E., 2000, “Risk-Based Inspection of FPSOs,” OMAE 2000, New Orleans, LA.
Classification Note No 30.2, 1984, “Fatigue Strength Analysis for Mobile Offshore Units,” DNV, Oslo, Norway.
PD 7910, 1999 “Guide on Methods for Assessing the Acceptability of Flaws in Fusion Welded Structures,” British Standard Institution. Draft 4.
Classification Note No. 30.7, 1998, “Fatigue Assessment of Ship Structures,” DNV, Oslo, Norway.
Bokalrud, T., and Karlsen, A., 1981, “Probabilistic Fracture Mechanics Evaluation of Fatigue Failure from Weld Defects in Butt Weld Joints,” Proceedings Conference on Fitness for Purpose Validation of Welded Constructions. London, UK, Paper 28.
Zettlemoyer,  N., and Fischer,  J. W., 1977, “Stress Gradient Correction Factor for Stress Intensity at Welded Stiffeners and Cover Plates,” Weld. Res. Suppl., 56, No. 12, pp. 393–398.

Figures

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POD curves for different inspection scenarios
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Description of inspection scenario
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Doubling plate in the deck structure
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Transverse stiffener in the deck structure
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Total expected cost as function of the target failure probability level. Expected inspection cost 0.1 percent; expected repair cost 1.0 percent rate of interest 6 percent.
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Two ground components with calculated fatigue lives equal to 0 yr
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Two ground components with calculated fatigue lives C1 equal to 20 yr and C2 equal to 40 yr
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Single component with calculated life equal to 20 yr
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Two components with calculated life equal to 20 yr
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Three components with calculated life equal to 20 yr
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Two components with fatigue life for C1 equal to 20 yr and C2 equal to 40 yr
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Connection between side longitudinal and transverse frame
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Accumulated probability as function of service time for web in transverse frame

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