A system being leak tested should show no pressure change for how long?

In the context of leak testing a system, a duration of 3 minutes is typically considered sufficient for detecting any pressure changes. This period allows for the identification of small leaks that may not result in immediate pressure variations but could still indicate a compromise in system integrity.

The reason for this specific timeframe is rooted in safety and practical monitoring. A 3-minute wait gives enough time to observe for any subtle pressure decreases that might occur due to leaks, ensuring that the system is functioning properly before it goes into operation.

Longer durations, such as 5 or 10 minutes, may be impractical for routine checks and could lead to unnecessary delays in system commissioning. Thus, the 3-minute mark strikes a balance between thorough testing and efficiency.