What is the required air testing procedure for gas piping systems?

The required air testing procedure for gas piping systems mandates that the system be tested at double the working pressure for a duration of 10 minutes. This approach is essential for ensuring that the piping system is free from leaks and can safely contain gas without failures. Testing at double the working pressure provides a safety margin, allowing for potential fluctuations in pressure that can occur during normal operation. The 10-minute duration allows for ample time to observe any pressure drops that could indicate a leak, making this method both thorough and reliable.

In contrast, the testing methods that involve shorter times or pressures lower than double the working pressure do not adequately ensure the integrity of the system and may not detect potential leaks that could pose safety risks when the system is in service. Therefore, adhering to the specified procedure strengthens safety and compliance with plumbing codes and regulations.