Under applicable rules, pipeline types are defined as follows:
Transmission Line Pipeline transporting gas from a gathering line or storage facility to a distribution center. Transmission lines are typically operated at higher pressures and stress levels.
Non-Rural (Urban) Gathering Line A gathering line that is located within city limits of a designated residential of commercial area such as a subdivision, business, shopping center, or community development.
Rural Gathering Line A gathering line located outside any incorporated municipality, commercial, or business area.
Federal Offshore Line A pipeline located on outer continental shelf lands. Federal waters offshore from Texas begin at 3 marine leagues, or 10.3 miles.
State Offshore Line A pipeline originating in a bay extending within 3 marine leagues, or 10.3 miles offshore.
Lease/Flow Line A pipeline located within the lease of production, carrying full well stream production to a tank battery, separator, or other production treatment equipment located on the lease.
Distribution Line A pipeline serving both as a common source of supply and associated branch lines serving consumers. Distribution lines are the source of supply for residential and small commercial users.
Master Meter System A natural gas pipeline system for distributing natural gas for within, but not limited to, a distinct area, such as a mobile home park, housing project, or apartment complex, where the operator purchases metered gas from an outside source. The natural gas distribution pipeline system supplies the end-consumer who either purchases gas directly through a meter or by other means such as rent.
Interstate System Typically, a natural gas pipeline transportation system extending beyond state boundaries. However for hazardous liquids systems, pipelines may be designated as interstate if they are connected to a pipeline that carries product out of state boundaries and affects foreign commerce subject to FERC tariffs.
Intrastate System A pipeline system for transporting natural gas or hazardous liquids within a state and not subject to the jurisdiction of FERC.
Hazardous Liquids Line A pipeline for transportation of petroleum or petroleum products such as gasoline, diesel fuels, or liquefied petroleum gas (LPG).
Sour Gas Line A pipeline system containing greater than 100 parts per million (ppm) hydrogen sulfide.