CSST History
Spools of CSST  
CSST was developed in Japan in the 1980s. It was developed as a safety improvement over rigid black iron gas pipes that often failed and started fires during earthquakes. The flexible nature of the CSST system allows it to handle seismic activity without leaking gas.

In the early 1980s, the Gas Research Institute initiated research into the use of CSST systems in the U.S.; listing processes, and code revisions needed to be developed and accepted by regulatory bodies. The American Gas Association Laboratory performance specification, AGA LC-1 1987 "Proposed Standard for Interior Fuel Gas Piping Utilizing CSST" was released in 1989. This was subsequently converted to a National Consensus Standard: ANSI LC-1 in 1990.

Sales of CSST in the U.S. began in 1990 with approximately 100,000 ft. sold. Use of CSST grew in the U.S. as contractors quickly discovered it could be installed in 1/3 the time of rigid black iron pipe systems. Beyond the time saved on installations, contractors and code officials appreciated the reduction of fitting joints in a flexible gas piping system. Joints are areas for concern in gas piping systems as they represent potential leak sites. Flexible CSST systems have approximately 75% fewer fitting joints than rigid black iron pipe systems.

All CSST manufacturers expressly added the bonding and grounding procedure to their installation requirements in August 2006. This improved safety installation requirement reduces the likelihood of arcing damage from an electrical surge that can potentially cause a fire.

More than one billion feet of CSST gas piping has been installed in approximately eight million homes in the U.S. since 1990.