ASCE/SEI Standard 25-06 provides current minimum functionality requirements for earthquake-actuated automatic gas shut-off devices and systems. This Standard, a thorough revision of ASCE/SEI Standard 25-97, is applicable only to devices carrying gaseous fuels, such as natural gas and propane. The seismic performance requirements established by this new edition are based upon dynamic testing of current devices and in-depth examination of data on ground motions, structural damage, fire initiation, and actuation of existing earthquake shutoff devices.