Pipeline construction projects built in the United States to the recent requirements for operation at 80% SMYS are subjected to high stress pre-service hydrostatic tests. At very high stress levels, pipe diameter expansion, as measured by an ILI caliper tool, should not be a surprising result. In some cases, however, excessive pipe expansion has occurred and been reported by PHMSA in an industry advisory bulletin regarding potentially low yield strength results for X-70 and X-80 grade pipes. In response to this advisory notice, a detailed review was made of pipe expansion conditions for the 270 mile Southeast Supply Header (SESH) pipeline which was built in 2008. This review included a statistical analysis of the pipe yield strength and dimensional characteristics prior to installation, a review of hydrostatic test levels during the pre-service field hydrotest, and the corresponding diameter results measured by the multi-channel in-line inspection caliper tool. The results demonstrate that the pipe yield strength property distribution was well within good X-70 and X-80 process capability. The purpose of this paper is to demonstrate that explanations other than low yield strength pipe may be responsible for pipe expansion.
- International Petroleum Technology Institute and the Pipeline Division
Analysis of Pipe Expansion Associated With Field Hydrostatic Testing
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Rapp, SC, Dimopoulos, D, Gotsis, V, Lamberth, W, & Rosenfeld, MJ. "Analysis of Pipe Expansion Associated With Field Hydrostatic Testing." Proceedings of the 2010 8th International Pipeline Conference. 2010 8th International Pipeline Conference, Volume 2. Calgary, Alberta, Canada. September 27–October 1, 2010. pp. 179-185. ASME. https://doi.org/10.1115/IPC2010-31666
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