What is the maximum time allowed for water to reach the inspector's test in a combined DPV system?

The maximum time allowed for water to reach the inspector's test in a combined Double Check Valve Assembly (DPV) system is established by testing standards that aim to ensure the efficiency and effectiveness of the fire protection system. The 3-minute time frame balances practicality and reliability, allowing enough time for water to travel through the system to the inspector's test outlet without causing undue delays.

This specific duration helps ensure that the system is functioning properly and can deliver water effectively in an emergency situation. A shorter time may not be sufficient for the water to reach the outlet, particularly in larger or more complex systems, while a longer time could indicate potential issues such as trapped air or obstructions. The standard is in place to ensure that inspections and operational readiness can be completed efficiently while adhering to safety protocols. Therefore, the 3-minute requirement serves as an optimum time limit for both testing and ensuring reliable performance of the fire protection system.