When testing a drain waste and vent system with air, what is the minimum test pressure required?

The minimum test pressure required when testing a drain waste and vent system with air is 5 psi. This standard has been established to ensure that the system can effectively withstand pressure and identify any potential leaks.

Testing at this pressure allows inspectors to confirm the integrity of the system, ensuring that it can handle the expected operational pressures without failure. Using too low a pressure might not reveal existing issues, while higher pressures, although sometimes necessary in different contexts, may exceed the safe design limits for certain components, potentially causing damage during testing. Thus, testing at 5 psi balances safety and effectiveness, providing a reliable assessment of the system's condition.