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Crack Growth Model of Pipeline Steels in Near-Neutral pH Soil Environments

[+] Author Affiliations
Weixing Chen

University of Alberta, Edmonton, Alberta, Canada

R. Kania, R. Worthingham, S. Kariyawasam

TransCanada PipeLines Limited, Calgary, Alberta, Canada

Paper No. IPC2008-64475, pp. 713-722; 10 pages
doi:10.1115/IPC2008-64475
From:
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 2
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4858-6 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by ASME

abstract

This paper reports the crack growth behavior of pipeline steels in near-neutral pH environments. Crack growth data both from laboratory tests using compact tension (CT) specimen and from full scale tests of shallow cracks were analyzed using a true corrosion-fatigue model established recently. It has been found that the crack growth rate can be correlated with ΔK2 Kmax /fα , where ΔK is the stress intensity factor range; Kmax is the maximum stress intensity factor; f is the loading frequency; and α is a factor related to corrosivity of soil environments. This correlation enables determination of threshold ΔK2 Kmax /fα values for long cracks such as in a test using CT specimen. The above growth correlation appears also true for small/shallow cracks in full scale tests except that small/shallow cracks were found to grow at appreciable rates below the threshold of long/deep cracks. Implications of the growth model to crack growth occurring in the field and pipe integrity management were also discussed in the paper.

Copyright © 2008 by ASME

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