For a DWV-system pressure test, how long must the system maintain pressure for inspection?

In the context of a Drainage, Waste, and Vent (DWV) system pressure test, maintaining pressure for a specific duration is crucial for ensuring the integrity and functionality of the plumbing system. A test duration of 15 minutes is considered standard in the plumbing code for pressure testing. This timeframe allows sufficient opportunity to monitor the system for leaks or pressure drops that could indicate a failure in the joints or piping.

Maintaining pressure for this length of time provides a robust indication of the system's ability to withstand both the expected operational pressures and any potential transient pressures that may occur during typical use. If the pressure remains stable over the 15 minutes, it indicates that the system is likely sound and will perform correctly when put into service.

Shorter test durations may not provide a reliable assessment of the system’s integrity, as it may not allow enough time to detect minor leaks or issues. This underscores the importance of adhering to the established guidelines for DWV system testing to ensure proper performance and compliance with plumbing codes.