What is the minimum test duration for gas piping systems up to 200 feet at 10 psig?

The minimum test duration for gas piping systems up to 200 feet at a pressure of 10 psig is 180 minutes. This duration is specified to ensure the integrity and safety of the gas piping system.

Testing for a specific period allows for adequate observation of the system for any drop in pressure, which might indicate a leak. The longer testing duration at higher pressures is crucial because it helps to confirm that all joints, fittings, and installed components are sealed properly and can withstand the operating conditions without failures.

Shorter durations might not detect less significant leaks that could pose safety hazards, emphasizing the importance of adhering to the established testing standards. Therefore, the correct choice supports the need for a thorough and reliable testing process to uphold safety in gas systems.