System Effects in Generic Risk-Based Inspection Planning

[+] Author and Article Information
Daniel Straub, Michael Havbro Faber

Swiss Federal Institute of Technology, IBK, ETH Hönggerberg, 8093 Zürich, Switzerland

J. Offshore Mech. Arct. Eng 126(3), 265-271 (Sep 20, 2004) (7 pages) doi:10.1115/1.1782642 History: Received September 23, 2002; Revised July 18, 2003; Online September 20, 2004
Copyright © 2004 by ASME
Topics: Inspection
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Illustration of the cost of inspection as a function of number of inspections
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Illustration of possible consequences dependent on the number of failed hot spots
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The general decision tree
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Probabilities of failure of a hot spot with respect to the FDF as evaluated according to the probabilistic model presented in the Annex
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Total expected cost for different inspection strategies for a specific single hot spot with FDF=2
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Illustration of the modular optimization approach
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Updating of a dependent hot spot after 20 inspections at t=10 yr, where ND stands for no detection, SD for detection of a crack less than 1 mm deep and LD for detection of a crack deeper than 1 mm
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Total expected cost with respect to the FDF for two different inspection strategies
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Relative share of the total expected cost over time for two different inspection strategies (averaged over the different FDF) and as given by Eq. (6) (the interest rate r is 0.05, service life SL is 20 years)
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Benefit of a hot spot with FDF=2 from inspection of a correlated hot spot at time 5, 10, or 15 years and for different FDF of the inspected hot spot
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EVSI of a hot spot with FDF=2 for different combinations of inspection
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Benefits, respectively cost, with respect to the number of performed relative to not performing any inspection



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