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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 By monitoring pressure changes over time, even small leaks can be identified, helping manufacturers maintain product quality and safety 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. Pressure decay leak testing is a reliable method for detecting leaks in sealed systems 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. One of the most common questions about leak testing is understanding when to use pressure decay versus flow First, let’s take a look at how each test works

In pressure decay, the part under test is pressurized (i.e Filled with air until it reaches a set pressure), then isolated from the supply pressure The pressure within the part is then monitored using a pressure sensor, and as the air. 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.

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