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Title: Platform life extension by inspection
Authors: Marshall, P.W. 
Copanoglu, C.C.
Keywords: Fatigue
Risk based inspection
Issue Date: 2009
Citation: Marshall, P.W.,Copanoglu, C.C. (2009). Platform life extension by inspection. Proceedings of the International Offshore and Polar Engineering Conference : 79-86. ScholarBank@NUS Repository.
Abstract: Fatigue test data are used to quantify the bias and uncertainty in total fatigue life and the interval between detectable crack initiation and member failure. Sources of additional "hidden" biase in fatigue life calculation are also considered: e.g. characteristic wave steepness, hydrodynamic coefficients, stress concentration factors, joint flexibility, S-N curves, and the interval between first member failure and structural collapse. Using the example of an actual 40-year-old platform with a calculated life of four years, various levels of inspection are examined for their relative credibility vis-a-vis the calculation. Targeted MPI of a limited number of joints, selected using the fatigue analysis, is examined for its ability to provide fatigue life extension of up to 20 years, with periodic inspection at shorter intervals providing the same level of safety as a new design at a damage ratio D=0.5 and no inspections beyond Level II fly-by. Copyright © 2009 by The International Society of Offshore and Polar Engineers (ISOPE).
Source Title: Proceedings of the International Offshore and Polar Engineering Conference
ISBN: 9781880653531
ISSN: 10986189
Appears in Collections:Staff Publications

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