What is the minimum uniform gauge pressure required for an air test on a drainage and vent system?

The minimum uniform gauge pressure required for an air test on a drainage and vent system is set at 5 PSI. This pressure threshold is essential to ensure that the system is adequately tested for leaks and that it can withstand the pressures it would experience during operation.

Conducting an air test at this specified pressure provides a standardized method for evaluating the integrity of the drainage and vent system, allowing for the identification of any weaknesses or potential failure points. Testing below this minimum pressure might not sufficiently reveal leaking joints, cracks, or other issues, allowing problems to persist undetected.

The specified minimum pressure is derived from the need to ensure safety and reliability in plumbing systems, as maintaining appropriate pressure is crucial to preventing backflow or other hazardous failures. Therefore, 5 PSI serves as not just a regulatory measure but also a practical one for effective system performance.