Recent Research and Development Relating to Platform Requalification

[+] Author and Article Information
Torgeir Moan

Norwegian University of Science and Technology, N-7034 Trondheim, Norway

J. Offshore Mech. Arct. Eng 122(1), 20-32 (Nov 15, 1999) (13 pages) doi:10.1115/1.533720 History: Received July 15, 1999; Revised November 15, 1999
Copyright © 2000 by ASME
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Sea-load-in-deck 34. (a) Typical time sample of sea-load-in-deck, with “permanent” deck load superimposed. (b) Comparison of loads obtained by the API and Kaplan approaches.
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North Sea jacket and sea load history. (a) FE model of eight-legged North Sea. (b) Typical sample of wave and current load history for cyclic analysis.  
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Static load-deformation characteristic of jacket for different pile-soil models; (a) broad side loading, (b) end on loading 27
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Total number of 690 fabrication and fatigue cracks, as arranged by crack depth, detected in 3411 inspections
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The number of in-service observations, fabrication and fatigue cracks detected as a function of year inspection, i.e., the number 80.5 represents the years 1980 and 1981. A fatigue crack is defined as a crack given at least 50 percent belief in being a fatigue crack.
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Reliability index for an eight-legged North Sea platform as a function of air gap and probabilistic pile-soil model 63
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Reliability index for a tubular joint designed for different cumulative damage ratios, Δd as a function of time; partly from 40
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Predicted and observed probability of crack detection based on 3366 inspections 1




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