Pressure decay leak testing is one of the most widely used techniques for detecting leaks in objects. The test process consists of 4 consecutive steps:
- Preparation:
The test part is first pressurized or vacuumed at a determined pressure/vacuum level. - Stabilization:
After isolation, the system is left idle for a period to stabilize the air inside it. - Test:
The system is monitored for any pressure variation using pressure transducers and/or differential pressure sensors. A pressure variation indicates the presence of a leak in the part, and the device shows if the test part is within an acceptable leak rate or not. - Venting:
The test air is vented out to the atmosphere, and the part returns to initial pressure conditions and is prepared for the next test cycle.
This type of test is preferred due to its non-destructive testing (NDT) capability, quick testing cycle, high sensitivity, and accuracy in leak detection.
