What exactly is vacuum decay?
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In leak testing, vacuum decay is where you draw a vacuum on the part being tested (inside of a radiator for example) and then close the valve between the part and the vacuum pump, while monitoring the pressure in the part. By checking the pressure change over time, you can determine the leak rate. This is done on parts that may not tolerate high pressures or may have extreme temperature/pressure curves. In heat exchangers, using pressure instead of vacuum can be problematic.
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