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Bubble Leak Testing is an example of both Leak. Detection, and Leak Location. Leak Testing Methods. 4. Page 5. Three common LT techniques for The three basic functions of leak testing are 1) determining if there is leakage or not (detection), 2) measurement of leak rate and 3) leakage location. There Pressure testing to find leaks. Page 4. 5. Leak test procedure. Page 5. 6. Reducing leakage and common leak points. Page 6. 7. Refrigerant charging. The first step is to define the desired tightness or leak rate. The next step is to determine the correct test method and test procedure. Impor- tant featuresDifferent methods can be used for leak testing: - Ultrasonic measurement. - Bubble test. - Pressure decay. - Vacuum decay test or pressure rise test. LEAK TEST PROCEDURE. All piping shall be pressure tested after the construction and before being place in operation to prove it has. Pressure measurement is the procedure most commonly used in industrial leak testing. At low test volumes it is possible to detect leaks as small as 0.1 cm3/min.