Transcription of Leak Detection Methods
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Leak Detection Methods
Leak Detection Methods : A Comparative Study of Technologies and Techniques Short version Table of Contents 1 Introduction .. 3 2 Leak testing Methods .. 3 Water immersion bubble test method .. 4 Soap solution bubble test .. 6 Pressure decay test .. 6 Vacuum decay test or Pressure rise test .. 8 Tracer gas leak testing .. 9 Sniffing .. 10 Accumulation leak testing .. 10 Vacuum chamber inside-out leak testing .. 11 Outside-in leak testing .. 11 Applications .. 12 Halogen leak detectors .. 12 Inside-out helium sniffer detectors .. 13 Outside-in helium spraying .. 14 Outside-in helium leak 15 Inside-out helium vacuum chamber leak 16 Inside-out hydrogen sniffer detectors .. 17 3 How to Choose the Test Method .. 18 4 Conclusion .. 20 1 Introduction In the refrigeration industry, components and systems must be leak tested to ensure that refrigerant leakages are below specified limits.
gas detectors (halogen, helium and hydrogen). The first three techniques, due to their characteristics and sensitivity, can be used only for gross leak detection (300 g/y (10.5 oz) or more refrigerant leakages). Tracer gas leak testing methods are much more precise than the previous group but, in many cases, their theoretical
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