What is the minimum hydrostatic test pressure and duration for piping in wet pipe sprinkler systems?

• A. 100 psi for 1 hour
• B. 200 psi for 2 hours
• C. 150 psi for 3 hours
• D. 250 psi for 2 hours

Answer: (B)

Hydrostatic testing of wet pipe sprinkler piping is used to prove the network can hold a high water pressure without leaking or failing. For wet pipe systems, the minimum test pressure is 200 psi and it must be maintained for 2 hours. This level and duration ensure the entire distribution runs under stress long enough to reveal any leaks or weak joints, after the system is filled with water and prepared for testing. Lower pressures or shorter durations would not meet the required standard, while higher pressures are not described as the minimum in this scenario.