What scenario necessitates a high-pressure leak test in gas piping?

A high-pressure leak test is required when adding new piping to a gas system. This scenario ensures that the integrity of the entire gas piping system is verified, particularly when modifications are made such as adding 20 feet of piping. The addition of new piping introduces potential points of weakness or failure, necessitating a thorough leak test to ensure that the joint integrity and overall system pressure are within safe limits.

In this context, the intent of a high-pressure leak test is to confirm that there are no leaks at the newly installed joints or within the existing piping that could lead to dangerous situations. It also helps in establishing that the gas system can safely handle the operational pressures. Therefore, any significant changes, like extending the piping, require this rigorous testing to comply with safety regulations and ensure proper functioning.