Fuel gas system
Fuel gas system means the offsite and onsite piping and flow and pressure control system that gathers gaseous stream generated by onsite operations, may blend them with other sources of gas, and transports the gaseous stream for use as fuel gas in combustion devices or in-process combustion equipment, such as furnaces and gas turbines, either singly or in combination.
Source
40 CFR § 60.481a
Scoping language
As used in this subpart, all terms not defined herein shall have the meaning given them in the Clean Air Act (CAA) or in subpart A of part 60, and the following terms shall have the specific meanings given them.