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Study on Transition of Stress Corrosion Cracking to Sharp Edge Corrosion for a Liquids Pipeline

[+] Author Affiliations
Jiajun (Jeff) Liang, Gurwinder Nagra

Enbridge Employee Services Canada, Inc., Edmonton, AB, Canada

Ziqiang (Alex) Dong, Mengshan Yu, Mariko Dela Rosa

Stantec Consulting, Ltd., Calgary, AB, Canada

Paper No. IPC2018-78405, pp. V001T03A065; 7 pages
doi:10.1115/IPC2018-78405
From:
  • 2018 12th International Pipeline Conference
  • Volume 1: Pipeline and Facilities Integrity
  • Calgary, Alberta, Canada, September 24–28, 2018
  • Conference Sponsors: Pipeline Division
  • ISBN: 978-0-7918-5186-9
  • Copyright © 2018 by ASME

abstract

Although stress corrosion cracking (SCC) growth is attributed to the synergistic effects of stress and corrosion, these two factors can just as easily become competing mechanisms, with stress cycles driving growth (hydrogen, the by-product of corrosion, may facilitate the growth), and corrosion working to blunt the crack tip and arrest growth. It follows that reducing the maximum pressure and cycling severity can slow down the crack growth or even stop it, and aggressive corrosion can further blunt the sharp crack tip. The Authors have observed, on a particular Polyethylene (PE) tape coated pipeline, instances where SCC has exhibited a propensity to corrode and convert into sharp edge corrosion. This is attributed to the combined effects of limited corrosion protection and low stresses. The focus of the paper is to assist operators in recognizing this phenomenon and integrate lessons learned into pipeline integrity management strategies.

Copyright © 2018 by ASME

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