Altogether, the U.S. energy pipeline network is composed of over 2.9 million miles of pipeline transporting natural gas, oil, and other hazardous liquids. The nation’s pipeline networks are widespread and vulnerable to accidents. This report reviews the history of federal programs for pipeline safety, significant safety issues, and recent developments focusing on key issues for Congress.
http://www.fas.org:8080/sgp/crs/misc/R44201.pdf