Foam-water system tests include a hydrostatic test at 200 psi. During this test, how long must the system maintain pressure with no loss?

Foam-water system tests include a hydrostatic test at 200 psi. During this test, how long must the system maintain pressure with no loss?

• A. 1 hour
• B. 2 hours
• C. 3 hours
• D. 4 hours

Answer: (B)

Hydrostatic testing of a foam-water system is all about proving the piping and components can handle the pressure without leaking. By filling the system and pressurizing it to a set test pressure, you’re checking for hidden weaknesses in joints, valves, fittings, and the foam-proportioning lines. The required hold time is two hours, during which the pressure must stay constant with no loss. This duration gives enough opportunity for even slow leaks to appear, ensuring the entire network can sustain the load and be relied upon during actual foam deployment. If the pressure remains steady for the full two hours, you confirm the system’s integrity; any drop would indicate leaks or failures that need repair before it can be approved.

Hydrostatic testing of a foam-water system is all about proving the piping and components can handle the pressure without leaking. By filling the system and pressurizing it to a set test pressure, you’re checking for hidden weaknesses in joints, valves, fittings, and the foam-proportioning lines. The required hold time is two hours, during which the pressure must stay constant with no loss. This duration gives enough opportunity for even slow leaks to appear, ensuring the entire network can sustain the load and be relied upon during actual foam deployment. If the pressure remains steady for the full two hours, you confirm the system’s integrity; any drop would indicate leaks or failures that need repair before it can be approved.