ANSI Z 21.80a-2012

This standard applies to line pressure regulators, either individual or in combination with over pressure protection devices, hereinafter referred to as device(s), intended for application in gas piping systems between the service regulator, or LP-gas 2 psi service regulator, and the gas utilization equipment. This standard applies to regulators for operation with natural, manufactured and mixed gases, liquefied petroleum gases, and LP gas-air mixtures.