What specification must regulator vent piping conform to?

The specification that regulator vent piping must conform to is UL 651. This standard covers the requirements for various types of conduit, including those that may be used for vent piping associated with regulators. Proper venting is essential in gas systems to ensure that gases do not accumulate in unsafe areas and that the system operates efficiently and safely.

UL 651 specifically addresses the materials, construction, and performance criteria necessary to withstand environmental factors and provide a reliable seal while properly directing vented gases. This makes it the appropriate standard for regulator vent piping.