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Air testing new drain piping seems convenient, but what sets the limits?
For new or altered residential drain piping, how do you decide whether an air test is acceptable or whether the test needs to use water? I’m curious how much that depends on the local code and the authority having jurisdiction, rather than convenience on the job.
I’d also like to understand what precautions and test limits matter for each method, since the risks aren’t the same. And just to keep the scope clear: I’m asking about drain piping, not pressure-testing water-supply lines. What should an apprentice or DIY renovator confirm before choosing a method?
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I’d confirm the locally accepted method and its written procedure before treating convenience as a deciding factor. Air testing can store energy in the pressurized system, so a failed plug or fitting can release force suddenly. Water avoids that compressed-air hazard, but a filled section can impose substantial weight and a leak can damage the building. Neither method is automatically suitable just because it seems safer; use only the specified pressure, duration, setup and limits for the approved test.
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