What is the minimum duration for hydrostatic testing?

What is the minimum duration for hydrostatic testing?

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

Answer: (B)

In hydrostatic testing, the goal is to verify that piping and joints hold pressure without leaks for a meaningful period. The standard minimum duration used is two hours. This length of time gives enough opportunity for any slow leaks or settling to appear and for the system to stabilize under test pressure. While longer durations can be required for certain systems or codes, two hours is the typical minimum across common fire protection piping scenarios. Shorter times, like one hour, may not reveal slow leaks, which is why they’re not considered sufficient.

In hydrostatic testing, the goal is to verify that piping and joints hold pressure without leaks for a meaningful period. The standard minimum duration used is two hours. This length of time gives enough opportunity for any slow leaks or settling to appear and for the system to stabilize under test pressure. While longer durations can be required for certain systems or codes, two hours is the typical minimum across common fire protection piping scenarios. Shorter times, like one hour, may not reveal slow leaks, which is why they’re not considered sufficient.