Flame Arrestor

‘A device fitted to the opening of an enclosure, or to the connecting pipe work of a system of enclosures, and whose intended function is to permit  flow, but prevent the transmission of flame.’

NOTE: This device should not be confused with a fire barrier, which is ineffective in the case of explosion.

Reference: Adapted from S2S (safety to safety website)(EN 13237:2003 (E))


‘A Flame Arrestor is a device which allows gas to pass through it but stops flame propagation in order to prevent a larger fire or explosion.’

Reference: Adapted from Flame Arrestor Technology. ENARDO Flame Arrestor Technology. http://www.enardo.com/pdfs/tech_paper_fat.pdf


‘A flame arrester (also called a deflagration arrester) functions by absorbing the heat from a flame front traveling at sub-sonic velocities, thus dropping the temperature or a burning gas/air mixture below its auto-ignition temperature: consequently, the flame cannot be sustained. The heat is absorbed through channels or passages of a small dimension which are designed into the arrester. These channels are chosen to be less than the MESG (Maximum Experimental Safe Gap) of the gas for a particular installation. These passages can be regular, like crimped metal ribbon or wire mesh or a sheet metal plate with punched holes, or irregular, such as those in random packing.’

Reference: Adapted from Arpentinier, Philippe; Cavani, Fabrizio; Trifiro, Ferrucio, The Technology of Catalytic Oxidations, TECHNIP. p. 748. ISBN 2-7108-0777-7


‘Flame arresters and detonation arresters are passive, mechanical devices installed on a storage tank nozzle or in a flammable vapor piping system. The arresters’ functions are: (1) to allow the passage of vapor under normal operating conditions and (2) to stop and extinguish any flame front propagating through the flammable vapor/air mixture under emergency conditions. Stopping the flame protects the storage tank, or the equipment located in the piping system, from the catastrophic damage that may result from an uncontrolled ignition. A variety of arrester designs are available. The choice of a proper arrester depends on factors such as the location of the arrester with respect to the ignition source and the flammable properties of the vapor/air mixture.’

Reference: THE PROTECTOSEAL COMPANY, (http://www.protectoseal.com/vaporFlame/vfFlameArrester.cfm)