Plumber Red Seal · Question
What is the standard hydrostatic (water) test pressure and duration for a new potable water supply system, according to the NPC?
The NPC generally requires a new water distribution system to be tested for leaks by subjecting it to a hydrostatic pressure of at least 1000 kPa (145 psi) for
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Question: What is the standard hydrostatic (water) test pressure and duration for a new potable water supply system, according to the NPC?
Answer options:
- 500 kPa (75 psi) for 30 minutes.
- The working pressure of the system for 24 hours. ✅ 1000 kPa (145 psi) for 15 minutes.
- Twice the system's static pressure for 1 hour.
Correct answer: 1000 kPa (145 psi) for 15 minutes.
Explanation: The NPC generally requires a new water distribution system to be tested for leaks by subjecting it to a hydrostatic pressure of at least 1000 kPa (145 psi) for a minimum of 15 minutes without any loss of pressure.
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