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Temporal Variability in Corrosion Modeling and Reliability Updating

[+] Author Affiliations
Daniel Straub, Michael Havbro Faber

Swiss Federal Institute of Technology, Zürich, Switzerland

Paper No. OMAE2005-67199, pp. 97-105; 9 pages
doi:10.1115/OMAE2005-67199
From:
  • ASME 2005 24th International Conference on Offshore Mechanics and Arctic Engineering
  • 24th International Conference on Offshore Mechanics and Arctic Engineering: Volume 2
  • Halkidiki, Greece, June 12–17, 2005
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 0-7918-4196-0 | eISBN: 0-7918-3759-9
  • Copyright © 2005 by ASME

abstract

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 on an example considering CO2 corrosion in pipelines. It is demonstrated how the time-variant corrosion process can be consistently represented by constant parameters, using equivalent values of the corrosion rate. Finally the influence of temporal variability on the reliability updating following inspections is investigated and it is shown how this effect can be accounted for in inspection planning.

Copyright © 2005 by ASME

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