Plumber Red Seal · Question
A plumber must perform a 15-minute air test on a new DWV system. What is the required test pressure according to the NPC?
The National Plumbing Code specifies a minimum air test pressure of 35 kPa (approximately 5 psi) to be held for at least 15 minutes without any perceptible drop
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Question: A plumber must perform a 15-minute air test on a new DWV system. What is the required test pressure according to the NPC?
Answer options:
- 15 kPa (2.2 psi)
- 25 kPa (3.6 psi) ✅ 35 kPa (5 psi)
- 100 kPa (14.5 psi)
Correct answer: 35 kPa (5 psi)
Explanation: The National Plumbing Code specifies a minimum air test pressure of 35 kPa (approximately 5 psi) to be held for at least 15 minutes without any perceptible drop in pressure.
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