What is the required minimum test duration for welded gas piping systems of 200 feet or more at 10 psig?

The required minimum test duration for welded gas piping systems of 200 feet or more at a pressure of 10 psig is indeed 180 minutes. This requirement is set to ensure that the integrity of the gas piping system is thoroughly assessed and confirmed to be leak-tight at the specified pressure over a significant period.

Testing for a minimum duration allows for any potential leaks to become evident, as some leaks might take time to fully manifest under pressure. A duration of 180 minutes provides a reasonable time frame for the testing process, ensuring that the system can hold the pressure without any leaks before it is put into service. Moreover, this standard is consistent with safety regulations and best practices in the industry, aiming to minimize risk and enhance safety for both the installation and operation of gas piping systems.