AdministrationQuestion 86 of 110
A finished DWV system is given a final air test instead of water. The system is pressurized to 5 psi and must hold for 15 minutes. What is the pass criterion?
a.Pressure may drop up to 2 psi
b.No pressure drop (the gauge holds 5 psi) for the required time
c.Any reading above 0 psi
d.Pressure must rise
Explanation
The air test passes only if the system holds the required 5 psi (about a 10 in mercury column equivalent) with no measurable drop for the full duration. A falling gauge indicates a leak that must be located and sealed. Air testing is common where a water test is impractical, such as in cold weather.
Law Reference: UPC §712.2Practice all 110 questions free — no signup required.
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