What is the standard hydrostatic test duration for all piping in wet pipe systems?

• A. One hour
• B. Two hours
• C. Twenty minutes
• D. Two days

Answer: (B)

Hydrostatic testing of wet pipe systems checks that all piping and fittings can withstand the test pressure without leaking. For wet pipe systems, the standard duration to hold the test pressure is two hours. This length of time ensures leaks that may only show up under sustained pressure are detected, while keeping the process practical to complete. The test is usually performed with water at the prescribed pressure (often referenced as a specific test pressure) and any observed leaks are addressed before the system is placed back into service.