Field Implementation of RBI for Jacket Structures

[+] Author and Article Information
Michael Havbro Faber

 Swiss Federal Institute of Technology, IBK, ETH Hönggerberg, 8093 Zürich, Switzerlandfaber@ibk.baug.ethz.ch

John D. Sørensen

 Aalborg University, Aalborg, Denmark Sohngaardsholmsvej 57, DK-9000, Aalborgjds@civil.auc.dk

Jesper Tychsen

 Maersk Oil and Gas AS Kanalen l, DK-6700 Esbjerg, Denmarkjpt@maerskoil.dk

Daniel Straub

 Swiss Federal Institute of Technology, IBK, ETH Hönggerberg, 8093 Zürich, Switzerlandstraub@ibk.baug.ethz.ch

J. Offshore Mech. Arct. Eng 127(3), 220-226 (Mar 29, 2005) (7 pages) doi:10.1115/1.1951777 History: Received November 10, 2003; Revised March 29, 2005

After a brief outline of the simplified and generic approach to reliability- and risk-based inspection planning, focus is set on a recent application of the methodology for the planning of in-service NDT inspections of fixed offshore steel jacket structures in the Danish part of the North Sea. The study includes a sensitivity analysis performed for the identification of relevant generic parameters such as the bending to membrane stress ratio, the design fatigue life, and the material thickness. Based on the results of the sensitivity analysis, a significant number of inspection plans were computed for fixed generic parameters (predefined generic plans) and a database named iPlan was developed from which inspection plans may be obtained by interpolation between the predefined generic plans. The iPlan database facilitates the straightforward production of large numbers of inspection plans for structural details subject to fatigue deterioration, as illustrated by an example in the paper.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Example relationship between FDF and probability of fatigue failure

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Figure 2

Example relationship between Residual Influence Factors (RIF) and annual collapse probability of failure

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Figure 3

Inspection planning decision tree

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Figure 4

An illustration of the flow of the generic inspection planning approach

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Figure 5

Semielliptical surface crack in a plate under tension or bending fatigue loads

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Figure 6

Reliability indices for SN and calibrated fracture mechanics corresponding to an accumulated probability of failure

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Figure 7

Inspection plan obtained by iPlan



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