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Originally published in 12th International Pipeline Conference 2018, November 6 (Volume 2: Pipeline Safety Management Systems; Project Management, Design, Construction, and Environmental Issues; Strain Based Design; Risk and Reliability)
A new approach for assessing an oval pipeline integrity segment is developed in the paper. The existing approaches require ovality measured in an empty pipe. The new approach can be used with ILI-reported ovality by considering the ovality reduction due to internal pressure during ILI. The approach evaluates the threats of ovalization due to both burst and fatigue and was verified by FEA.
The integrity threats of ovalization are discussed based on the new approach with following observations.
To sum up, ovalization is not a major threat to pipeline integrity. However, for liquid lines with severe pressure cycles, the fatigue life of the detected oval sections should be analyzed following the approaches provided in the paper. The conclusions do not consider interactions with other conditions that could be present in some pipelines including pitting corrosion, environmental cracking, seam defects, or mechanical damage. The potential for adverse interaction may be a subject for future research.
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