Pipelines transport gases and liquids in common practice, and have been used to transport solid capsules through pneumatic tubes. Gas and liquid commodities transported through pipelines include:

• Natural gas
• Oil
• Sewage
• Slurry
• Water

Accidents

Pipelines conveying flammable or explosive material such as natural gas or oil pose special safety concerns.

• June 4, 1989 - sparks from two passing trains detonated gas leaking from an LPG pipeline near Ufa, Russia. Up to 645 people were reported killed.
• October 17, 1998 - at Jesse in the Niger Delta in Nigeria, a petroleum pipeline exploded killing about 1200 villagers, some of whom were scavenging gasoline - the worst of several similar incidents in this country.
• June 10, 1999 - a pipeline in a Bellingham, Washington park leaked gasoline, vapor from leak exploded and killed 2 children
• July 30, 2004 - a major natural gas pipeline exploded in Ghislenghien, Belgium near Ath (thirty kilometres southwest of Brussels), killing at least 23 people and leaving 122 wounded, some critically. (Reuters) (CNN)

List of Pipelines

• Baku-Tbilisi-Ceyhan Pipeline (BTC)
• Operation Pluto - World's first undersea oil pipeline (1942)
• Trans-Afghanistan Pipeline (TAP)
• Trans-Alaska Pipeline System (TAPS)
• Trans-Israel pipeline

See also

• Hydrostatic test

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Pipeline transport has become a metaphor for "pipelines", a term used in computer science, electrical engineering, and manufacturing.