Distribution lines include four types:
- Supply main
This is the pipe that runs between the interconnection with the transmission system and feeder mains. It operates at a pressure between the high-pressure transmission and the medium-pressure feeder main. It may also be used to provide a direct connection from the transmission system to a large industrial customer or a power plant. - Feeder main
This is the pipe that connects the supply main (at a regulator station) to distribution mains. - Distribution main
This is the pipe that snakes through the service territory bringing gas through neighborhoods and business districts. - Service line
This is the line that connects customer meters with the distribution main.
After the meter, gas is carried by the customer-owned fuel line that serves specific equipment or appliances within the customer facility.