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Internal pressure test succeeds where other measures fail

02/08/2010
By Yuan Peng
Despite the promulgation of multiple standards regarding materials and methods used in pipeline construction and the adoption of these by contractors and operating companies, pipelines can and do fail. The current rapid expansion of pipeline networks globally (OGJ, Feb. 9, 2009, p. 52) combined with a constrained pool of qualified labor in the oil and gas industry as a whole (OGJ, July 20, 2009, p. 34) only heightens the importance of preservice inspection and testing.This article details a recent case in China in which pipeline flaws were only discovered during internal pressure testing.BackgroundA leak occurred at 4.3 MPa during internal air pressure tests of a natural gas pipeline. A h...
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