Leak testing can be achieved using various leak detection methods and is employed to test for defects in products and to ensure the proper function and maintenance of industrial systems and pipelines. The choice of the detection method depends on which method is most appropriate for the system at hand.

There are several points on performing leak test:

1. Leak test shall be conducted after passing the hydraulic test. The leak test can be carried out simultaneously with the air pressure test for the pressure vessel required by the design. The test pressure shall be the pressure of the air pressure test.

2. The gas used in the leak test should be dry, clean air, nitrogen or other inert gas.

3. When conducting leak test, safety accessories should be fully installed.

4. During the test, the pressure shall rise slowly, after reaching the specified test pressure, the pressure shall be maintained for no less than 30 minutes, and then the pressure shall be reduced to the design pressure. All welds and joints shall be coated with soapy water for inspection, and no leakage shall be considered as qualified. In case of leakage, hydraulic test and leak test shall be conducted again after repair.

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