AGA: American Gas Association.

APGA: American Public Gas Association.

AOPL: Association of Oil Pipe Lines, an industry trade group.

API: American Petroleum Institute, an industry trade group.

Barrel: 42 U.S. gallons. Batch: A quantity of petroleum product of similar specification that is moved as an identifiable unit through the pipeline.

Booster Station: A pump station used to increase the pressure of oil received through a main pipeline to transmit it to the next station or terminal.

Cold Zone: Area safe for necessary personnel. Common Carrier: Any transportation system available for use by the public for transporting cargo; almost all interstate pipelines are common carriers.

Compressor Station: A facility that increases the pressure of a gas to move it through a pipeline system.

Crude Oil: The basic raw mineral pumped from the earth. There are many different grades of crude, each containing various vapors, liquids and solids. This crude is changed at a refinery into products.

Cubic foot: Most common unit of measurement for gas volume.

Easement: An interest in land owned by another that entitles its holder to a specific limited use.

Gas: Natural gas, flammable gas, or gas which is toxic or corrosive.

Geographic Information System: A computer-based system that captures, stores, edits, displays, plots, and analyzes geographically referenced information.

High Consequence Area: Population center or environmentally sensitive area.

High Pressure Pipelines: Pipe systems which operate at 600 psi to 2000 psi and higher.

Hot Zone: Area where hazardous vapors and liquids are present.

INGAA: Interstate Natural Gas Association of America. Interface: The mixture which occurs in normal pipeline operations between batches of petroleum products having different specifications. Also known as “transmix.”

Line Section: A continuous run of pipe between locations. Manifold: An arrangement of piping and valves to provide interconnecting links between a number of pumps or compressors, tanks or pressure vessels, and lines at a pipeline facility.

Pig: A device placed inside a pipeline that is used to clean or scrape residues from the inner wall of the pipe.

Pipeline System: All parts of the physical facilities through which commodities move, including line pipe, valves, pumping or compressor units, metering stations and tankage, storage caverns or pressure vessels.

Products: Refined substances made from crude oil. Gasoline, fuel oil, butane and a host of various other petroleum products that we transport in pipelines.

Pump Station: A facility that increases the pressure of a hazardous liquid to move it through a pipeline system. Right-of-Way: A strip of land on which permission has been granted by landowners for the construction/maintenance of a pipeline.

Smart Pig: A device placed inside the pipeline to provide data about the pipeline, such as measuring dents or locating corrosion.

Tank Farm: A group of tanks connected to a pipeline through which hazardous liquids are moved.