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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 Learn how the pressure decay method works, where it excels, and when to consider other leak testing solutions. A pressure loss greater than a predetermined setting indicates a leak
Best Precise Vacuum Decay Leak Test Equipment | ASTM F2338
The sensitivity and accuracy of the pressure decay measurement is a function of the test part. The pressure decay measurement uses the ideal gas equation of state and the measured pressures, temperatures, and time to determine the mass loss. The pressure decay test method pressure decay testing arrangement pressure decay is probably the most widely used method of leak testing in manufacturing production lines
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. Pressure decay leak testing is used to test products for leaks by trapping pressure inside a product and then measuring pressure loss. While it excels in general leak detection, it has limitations such as its sensitivity to temperature changes and inability to pinpoint leak locations. 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
