Plumber Red Seal · Question
A plumber is inspecting a newly installed 150 mm diameter building sewer for leaks using an air test. According to the National Plumbing Code of Canada, what is the minimum test pressure that must be maintained in the pipe for a specified duration?
The National Plumbing Code of Canada (NPC) specifies that when testing a drainage system or building sewer with air, a pressure of at least 3.5 kPa (0.5 psi) mu
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Question: A plumber is inspecting a newly installed 150 mm diameter building sewer for leaks using an air test. According to the National Plumbing Code of Canada, what is the minimum test pressure that must be maintained in the pipe for a specified duration?
Answer options: ✅ 3.5 kPa for 15 minutes
- 35 kPa for 15 minutes
- 50 kPa for 30 minutes
- 70 kPa for 10 minutes
Correct answer: 3.5 kPa for 15 minutes
Explanation: The National Plumbing Code of Canada (NPC) specifies that when testing a drainage system or building sewer with air, a pressure of at least 3.5 kPa (0.5 psi) must be maintained for a minimum of 15 minutes without any loss of pressure. Higher pressures could potentially damage fittings or pipes.
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