What pressure and duration is required for the standing water test of the DWV system?

The standing water test for the Drainage, Waste, and Vent (DWV) system is designed to ensure that the system can handle the anticipated loading without leaks. The requirement for a pressure of 10 feet of head pressure corresponds to a hydrostatic test that replicates the conditions the system will face when in use.

Using 10 feet of head pressure equates to approximately 4.3 psi, which is sufficient to assess the integrity of the DWV system. This pressure is maintained for a duration of 15 minutes, allowing enough time to monitor for any signs of leakage or failure in the system. The use of head pressure simulates a realistic loading condition as it closely represents the pressure exerted by a column of water, which is essential in determining if the connections and joints are watertight under actual service conditions.

Other choices either specify pressure levels that are not standard for this test or vary the duration in ways that are not consistent with typical industry practices. Thus, the selection of 10 feet of head pressure for 15 minutes captures the necessary testing protocol for assessing the DWV system's reliability.