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August, 2001 - Detecting Leaks in Gas Systems A compressed gas "system" can be as simple as a regulator-hose-torch connection or as complex as an entire building plumbed to deliver gases to multiple outlets. Gas systems should always be tested for leaks prior to use; depending upon the gas(es) and conditions of use, your life could depend upon it! Some systems can be leak-checked by applying pressure and watching for pressure degradation over time. This is a specialized procedure, not suitable or practical for many applications, and only trained technicians should use it. The most common method of leak detection is to apply a suitable liquid to fittings or suspected leaks and watch for bubbles. Although a weak solution of soapy water is suitable for some applications, users should be careful to use soap which does not contain anything that would react with the gas or system components and to thoroughly rinse with clear water afterward. The safest method is to use a commercially-available leak detection solution formulated specifically for the gas(es) used which will not react with system components. If the gas system contains oxidizing gases (e.g., oxygen, nitrous oxide, chlorine) or if you are in doubt, use a solution certified to be "oxygen-compatible."
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