For how long should the pressure be held during a hydro test?

The correct duration for holding the pressure during a hydro test is 30 seconds. This timeframe is essential for ensuring that the system being tested can withstand the specified pressure without any leaks or failures. Holding the pressure for this period allows for a thorough examination of the system's integrity, as it provides adequate time to identify any potential issues that may not be immediately apparent.

In hydro testing, a water-based solution is typically used to exert pressure on the components, which must maintain that pressure without any significant drop for the full duration of the test. If the pressure holds steady for 30 seconds, it indicates that the system is likely sound and capable of performing under the necessary operational pressures, which is critical for safety during fire operations or other emergency scenarios.