Leak testing can effectively detect the exact location of leakage points in industrial facilities such as flanges, valves, instruments, etc., which facilitates on-site repairs and provides efficient protection for the safe operation of industrial facilities. Leak testing adopts different test methods according to the design pressure, design temperature, internal medium and operation status of the process system, and provides a full range of leak testing services including hydraulic test, gas tightness test and helium leak testing.