What is the minimum time of a witnessed hydrotest?

The minimum time for a witnessed hydrotest is established to ensure that the test is conducted thoroughly and that the system being tested can withstand the pressure without any leaks or failures over a specified duration. A hydrotest typically involves filling the system with water and pressurizing it to a specified level to check for integrity.

In this context, a duration of 10 minutes is generally considered sufficient for observing any immediate pressure drops, which could indicate leaks. This time frame allows for adequate monitoring and inspection during the test process. Conducting the test for this minimum period helps ensure that any potential issues can be identified immediately, providing confidence in the system's integrity before it is put into service.

While longer durations may be specified in some application codes or standards for specific systems, the 10-minute duration is commonly accepted in regulatory frameworks for most typical hydrotesting scenarios.