Gas pipeline valves and fittings and pipe system components. Must be of the type used on gas, especially designed and tested to verify compliance with the standard.
The gas pipe system valve and pipe system components and devices must be of the type that is applied to the gas, particularly by creating design validation and testing to meet the standards.
gas pipeline system as well as tongue and components of the system is a type of pipe must be used with gas, particularly in design, build, test and check in accordance with standards