- Applications with very low leak rates
- Stable parts with no volume difference part to part
- Measurable specification when converting from dunk testing to pressure decay testing
The Pressure Decay test dP and dP/dT determines pressure loss measured over a fixed time and is presented as the amount of pressure change within the test part volume . The basic operation of a pressure decay test is to fill the test part to a specified target test pressure, isolate the test part circuit from the pressure source, stabilize the pressure and test part, then measure the pressure loss over a defined test time.
The pressure decay dP and dP/dT test results provide a delta pressure loss as the result of a leak and is reported as dP or dP/dT. The dP test reports the ‘pressure drop’ for the full test time. The dP/dT test measures the pressure drop and reports the ‘calculated pressure drop’ identified as a pressure loss per one second.
| dP Test | |
| Test time | = 10 sec |
| Measured leak | = 1.0 psig |
| Pressure drop | = 1 psig in 10 seconds |
| dP/dT Test | |
| Test time | = 10 sec |
| Measured leak | = 1.0 psig |
| Pressure drop | 1.0 psig / 10 sec = 0.1 psig per second |
As standard, the pressure decay leak test methods can be performed with pressure (P) or vacuum (V) and results identified as dP, dV, dP/dT, or dV/dT.
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