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A Modeling Approach to High pH Environmentally Assisted Cracking

[+] Author Affiliations
J. Been, F. King

NOVA Chemicals Corporation, Calgary, AB, Canada

L. Fenyvesi, R. Sutherby

TransCanada PipeLines Limited, Calgary, AB, Canada

Paper No. IPC2004-0361, pp. 83-100; 18 pages
doi:10.1115/IPC2004-0361
From:
  • 2004 International Pipeline Conference
  • 2004 International Pipeline Conference, Volumes 1, 2, and 3
  • Calgary, Alberta, Canada, October 4–8, 2004
  • Conference Sponsors: International Petroleum Technology Institute
  • ISBN: 0-7918-4176-6 | eISBN: 0-7918-3737-8
  • Copyright © 2004 by ASME

abstract

A model is described for predicting the incidence of high-pH SCC on gas pipelines. The model is mechanistic and is based on a film rupture mechanism of crack growth. Based on field pressure cycle data, the model determines the crack tip strain rate and the occurrence of film rupture events at the crack tip during operating pressure cycles. Crack aspect ratio data were obtained from field data. Probabilistic distribution functions were assigned to input parameters and a Monte Carlo method was used to produce probabilistic crack growth rate distributions. The model grows a crack to failure while considering the effects of temperature and potential.

Copyright © 2004 by ASME

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