Intermediate and high-pressure water mist systems require two pressure tests. What is the initial test duration, and the duration of the working pressure test that follows?

Intermediate and high-pressure water mist systems require two pressure tests. What is the initial test duration, and the duration of the working pressure test that follows?

• A. 5 minutes, 60 minutes
• B. 10 minutes, 110 minutes
• C. 15 minutes, 90 minutes
• D. 20 minutes, 120 minutes

Answer: (B)

Two-stage pressure testing is used to verify both immediate integrity and long-term reliability of a water mist system. The initial test is a brief check that quickly looks for obvious leaks or weak connections, so it doesn’t delay the process but still confirms there are no obvious faults. The second stage is a longer test at the working pressure to prove the system can sustain pressure over time, ensuring there are no slow leaks and that all components hold up under duty for the duration. In this protocol, the initial stage lasts ten minutes, giving a quick yet meaningful verification without dragging on. The following working pressure test lasts one hundred ten minutes, so the total test time sums to two hours. This long-run check simulates real operating conditions and confirms long-term stability under pressure. Other schedules either don’t provide enough time to observe potential slow leaks (shorter totals) or exceed the standard two-hour duration, which is why they aren’t used.

Two-stage pressure testing is used to verify both immediate integrity and long-term reliability of a water mist system. The initial test is a brief check that quickly looks for obvious leaks or weak connections, so it doesn’t delay the process but still confirms there are no obvious faults. The second stage is a longer test at the working pressure to prove the system can sustain pressure over time, ensuring there are no slow leaks and that all components hold up under duty for the duration.

In this protocol, the initial stage lasts ten minutes, giving a quick yet meaningful verification without dragging on. The following working pressure test lasts one hundred ten minutes, so the total test time sums to two hours. This long-run check simulates real operating conditions and confirms long-term stability under pressure.

Other schedules either don’t provide enough time to observe potential slow leaks (shorter totals) or exceed the standard two-hour duration, which is why they aren’t used.