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Pressure Change Measurement Leak Testing Errors

A pressure change test is a common leak testing technique used in construction and NDT. The test is known as being a fast, simple and easy to apply evaluation technique. While this technique may be fairly quick to conduct and require simple instrumentation, the engineering behind this type of test is more complex than is apparent on the surface. This paper intends to discuss some of the more common errors made during the application of a pressure change test and give the test engineer insight into how to correctly compensate for these factors. The principals discussed here apply to ideal gases such as air or other monoatomic or diatomic gasses; however, these same principals can be applied to polyatomic gasses or liquid flow rate with altered formula specific to those types of tests using the same methodology.

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