A system being leak tested should not show any change in pressure for how long?

In the context of leak testing propane systems, it is essential to ensure that there is no pressure change over a defined time period. A pressure drop indicates a potential leak, which could lead to hazardous situations. The recommended duration for observing no change in pressure is typically 3 minutes. This duration strikes a balance between providing enough time to accurately identify any minute pressure changes while also allowing for an efficient testing process. A longer testing duration than necessary may not be practical, while a shorter duration may not provide reliable results for detecting leaks. Thus, 3 minutes is established as a standard timeframe to confirm the integrity of the system against leaks.