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.
- International Petroleum Technology Institute and the Pipeline Division
Significance of Splits and Pop-Ins Observed During Fracture Toughness Testing of Line Pipe Steel
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Pisarski, HG, Hammond, R, & Watt, K. "Significance of Splits and Pop-Ins Observed During Fracture Toughness Testing of Line Pipe Steel." Proceedings of the 2008 7th International Pipeline Conference. 2008 7th International Pipeline Conference, Volume 3. Calgary, Alberta, Canada. September 29–October 3, 2008. pp. 473-482. ASME. https://doi.org/10.1115/IPC2008-64676
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