Plumber Red Seal · Question
When performing a hydrostatic test on a new potable water distribution system, what is the minimum required pressure and duration?
The NPC often requires a hydrostatic test pressure of 125 psi (860 kPa) for a minimum of 2 hours for potable water systems to ensure they are leak-free and can
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Question: When performing a hydrostatic test on a new potable water distribution system, what is the minimum required pressure and duration?
Answer options:
- 100 psi (690 kPa) for 30 minutes ✅ 125 psi (860 kPa) for 2 hours
- 150 psi (1035 kPa) for 1 hour
- 50 psi (345 kPa) for 15 minutes
Correct answer: 125 psi (860 kPa) for 2 hours
Explanation: The NPC often requires a hydrostatic test pressure of 125 psi (860 kPa) for a minimum of 2 hours for potable water systems to ensure they are leak-free and can withstand operational pressures.
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