HYDROSTATIC TESTING-1: Pressure ratios key to effectiveness; in-line inspection complements

A review of literature and reported operating experience on the use of hydrostatic testing to verify pipeline integrity suggests that the test-pressure-to-operating-pressure ratio measures the effectiveness of the test and that in-line inspection is usually preferable to hydrostatic testing.Moreover, testing to actual yield is acceptable for modern materials.Pressure reversals, if they occur, tend to erode confidence in the effectiveness of a test but usually not to a significant degree; minimizing test-pressure cycles minimizes the chance for pressure reversals.These findings form the first of this two-part series on hydrostatic testing. The concluding article (Aug. 7, 2000) deals with t...

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