Metallurgical and Materials Transactions A

, Volume 48, Issue 4, pp 1629–1640 | Cite as

Crack Growth Modeling and Life Prediction of Pipeline Steels Exposed to Near-Neutral pH Environments: Dissolution Crack Growth and Occurrence of Crack Dormancy in Stage I

  • Jiaxi Zhao
  • Weixing Chen
  • Mengshan Yu
  • Karina Chevil
  • Reg Eadie
  • Greg Van Boven
  • Richard Kania
  • Jenny Been
  • Sean Keane
Article

Abstract

This investigation was initiated to provide governing equations for crack initiation, crack growth, and service life prediction of pipeline steels in near-neutral pH (NNpH) environments. This investigation has focused on the crack initiation and early-stage crack growth. The investigation considered a wide range of conditions that could lead to crack initiation, crack dormancy, and crack transition from a dormant state to active growth. It is concluded that premature rupture caused by stress cracking at a service life of about 20 to 30 years previously observed during field operation could take place only when the worst conditions responsible for crack initiation and growth have been realized concurrently at the site of rupture. This also explains the reason that over 95 pct of NNpH cracks remain harmless, while about 1 pct of them become a threat to the integrity of pipeline steels.

Keywords

Residual Stress Crack Initiation Crack Growth Rate Stress Corrosion Crack Crack Depth 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors would like to thank TransCanada Pipeline Limited, Spectra Energy Transmission, Natural Science and Engineering Research Council of Canada, the Pipeline Research Council International (PRCI) and US Department of Transportation for financial support.

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2017

Authors and Affiliations

  • Jiaxi Zhao
    • 1
  • Weixing Chen
    • 1
  • Mengshan Yu
    • 1
  • Karina Chevil
    • 2
  • Reg Eadie
    • 1
  • Greg Van Boven
    • 3
  • Richard Kania
    • 2
  • Jenny Been
    • 5
  • Sean Keane
    • 4
  1. 1.Department of Chemical and Materials EngineeringUniversity of AlbertaEdmontonCanada
  2. 2.TransCanada Pipelines LimitedCalgaryCanada
  3. 3.Spectra Energy Transmission Ltd.VancouverCanada
  4. 4.Enbridge Pipelines Inc.EdmontonCanada
  5. 5.IRISNDT-EngineeringCalgaryCanada

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