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Significance of Splits and Pop-Ins Observed During Fracture Toughness Testing of Line Pipe Steel

[+] Author Affiliations
Henryk G. Pisarski, Ruth Hammond

TWI Ltd., Great Abington, Cambridge, UK

Keith Watt

AMEC Group Ltd., Aberdeen, UK

Paper No. IPC2008-64676, pp. 473-482; 10 pages
  • 2008 7th International Pipeline Conference
  • 2008 7th International Pipeline Conference, Volume 3
  • Calgary, Alberta, Canada, September 29–October 3, 2008
  • Conference Sponsors: International Petroleum Technology Institute and the Pipeline Division
  • ISBN: 978-0-7918-4859-3 | eISBN: 798-0-7918-3835-8
  • Copyright © 2008 by TWI Ltd. and AMEC


The occurrence of pop-in on the test record of fracture toughness tests and appearance of splits on the fracture surface, coupled with failure to meet Charpy toughness requirements, raised doubts about the fracture integrity of a parent pipe to API 5L X65 for low temperature operation. The cause of pop-in was investigated using fractographic and metallographic methods and additional fracture mechanics testing was conducted using different notch orientations. In addition, fitness-for-service was assessed using a fracture mechanics assessment procedure. It is shown that for typical flaw orientations that might be present, the apparent fracture toughness at pop-in is not representative. Nevertheless, it is shown that for the stress levels considered, the pipeline is tolerant to flaws without risk of fracture initiation at low temperature.

Copyright © 2008 by TWI Ltd. and AMEC



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