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Pressure Testing

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  • Pressure Testing

    I am installing a 3/4 copper waterline that will be concealed under a concrete slab and would like to know which pressure testing method would be best? I have heard air and also water! Also what type of gauges and at what pressure? Any input would be greatly appreciated...

  • #2
    Most plumbing codes limit the pressure allowed in a domestic water system to 80 PSI. Some require that the line be tested at the normal operating pressure and some require a higher pressure. If you want to be sure use a minimum test pressure of 1-1/2 times the 80 PSI which would be 120 PSI, but not more that 150 PSI.

    Use a gauge that is just over the test pressure so that a small drop in pressure will be able to be detected quickly.