Many parameters influencing corrosion degradation are time variant and the corrosion process is thus subject to temporal variability, the real characteristics of which are commonly neglected in reliability assessment. After a short overview on the quantitative modeling of corrosion loss, a comparison is made between different temporal models of corrosion degradation and the consequences of applying an inappropriate model are investigated. The effect of temporal variability is then investigated in detail and illustrated in an example considering corrosion in pipelines. It is demonstrated how the time-variant corrosion process can be consistently represented by time-invariant random variables, using equivalent values of the corrosion rate. Finally, the influence of temporal variability on reliability updating following inspections is investigated and it is shown how this effect can be accounted for in inspection planning.
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e-mail: straub@ce.berkeley.edu
e-mail: faber@ibk.baug.ethz.ch
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November 2007
Technical Papers
Temporal Variability in Corrosion Modeling and Reliability Updating
Daniel Straub,
Daniel Straub
Department of Civil and Environmental Engineering,
e-mail: straub@ce.berkeley.edu
University of California
, Berkeley, CA 94720-1710
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Michael Havbro Faber
e-mail: faber@ibk.baug.ethz.ch
Michael Havbro Faber
Institute of Structural Engineering (IBK)
, ETH Zurich, 8093 Zurich, Switzerland
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Daniel Straub
Department of Civil and Environmental Engineering,
University of California
, Berkeley, CA 94720-1710e-mail: straub@ce.berkeley.edu
Michael Havbro Faber
Institute of Structural Engineering (IBK)
, ETH Zurich, 8093 Zurich, Switzerlande-mail: faber@ibk.baug.ethz.ch
J. Offshore Mech. Arct. Eng. Nov 2007, 129(4): 265-272 (8 pages)
Published Online: May 26, 2006
Article history
Received:
July 21, 2005
Revised:
May 26, 2006
Citation
Straub, D., and Faber, M. H. (May 26, 2006). "Temporal Variability in Corrosion Modeling and Reliability Updating." ASME. J. Offshore Mech. Arct. Eng. November 2007; 129(4): 265–272. https://doi.org/10.1115/1.2355517
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