The process is uncomplicated, relatively inexpensive and easily automated Air is simply injected into a test object, after which the pressure source is valved off. In simple terms, the pressure decay test fills a pressure vessel with air until it reaches its target pressure, cuts the air source to isolate the pressure, and measures the decay (loss) of that pressure over a set period of time A pressure loss greater than a predetermined setting indicates a leak The sensitivity and accuracy of the pressure decay measurement is a function of the test part. 1.1 this practice describes a method for determining the leakage rate of a vessel subject to a positive pressure difference
The technique is based upon evaluation of the change of mass within the test object based on a pressure decay measurement The pressure decay measurement uses the ideal gas equation of state and the measured pressures, temperatures, and time to determine the mass loss. While it excels in general leak detection, it has limitations such as its sensitivity to temperature changes and inability to pinpoint leak locations. Pressure decay leak testing what is a pressure/vacuum decay test Pressure decay testing measures the change in pressure between atmospheric pressure and your pressurized test sample Unlike some other current methods of leak testing, this test method yields quantitative information, hard data points that can be recorded and upon which decisions can be made
Pressure decay leak testing is used to test products for leaks by trapping pressure inside a product and then measuring pressure loss.
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