A test that applies air or water pressure to a piping system to verify it holds without leaks before walls are closed.
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In the Field
Plumbers and mechanical contractors pressure test after rough-in and before insulation or drywall. Inspectors often witness the test. Air tests are used for gas lines; hydrostatic (water) tests for plumbing.
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Rule of Thumb
Standard hydrostatic test holds 1.5x working pressure for a minimum of 2 hours with no pressure drop.