What is defined as a mainline in a gas distribution system?

In a gas distribution system, a mainline is defined as the primary pipeline that delivers gas from the supply source to distribution points. This pipeline is crucial because it is responsible for transporting large volumes of natural gas over considerable distances, typically from production areas or storage facilities to local distribution systems or end users.

Mainlines operate at high pressures to efficiently move gas through the pipeline system, and the integrity and capacity of these pipelines are vital for ensuring a reliable supply of gas. They serve as the backbone of the gas distribution network and are distinctly different from secondary pipelines, which are smaller and used to distribute gas from the mainline to consumers. The role of a mainline is foundational in maintaining the flow of natural gas and supplying the infrastructure needed for distribution.