Plumber Red Seal · Question
A building's water supply has a static pressure of 690 kPa (100 psi). According to the NPC, what device is required?
The NPC limits the static water pressure within a building's distribution system to 550 kPa (80 psi). If the supply pressure exceeds this, a PRV must be install
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Question: A building's water supply has a static pressure of 690 kPa (100 psi). According to the NPC, what device is required?
Answer options:
- A water hammer arrestor on every fixture supply. ✅ A pressure-reducing valve (PRV) on the main water service.
- A larger diameter water service pipe.
- A backflow preventer at the property line.
Correct answer: A pressure-reducing valve (PRV) on the main water service.
Explanation: The NPC limits the static water pressure within a building's distribution system to 550 kPa (80 psi). If the supply pressure exceeds this, a PRV must be installed to protect fixtures and piping from excessive pressure.
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