An in-line deflagration flame arrester prevents light-back at deflagration of potentially explosive vapour-air and/ or gas-air mixtures.


If a flame front propagates through a pipe, its speed will increase proportionally to the length of the pipe. If a pipe is shorter than 50 times (respectively 30 times for explosion group IIB and IIC) its internal pipe diameter, the flame will propagate at subsonic speed. In this case, securing the protected side by a deflagration flame arrester will be sufficient. If the pipe is longer than 50 times its internal diameter (valid for explosion group IIA, IIB1, IIB2, IIB3 respective 30 times for explosion group IIB and IIC) flame will propagate at supersonic speed that means in a detonation.
A deflagration flame arrester operates at a lower pressure drop than a detonation flame arrester and is not suitable for detonation.

Our products are approved to EN ISO 16852 (formerly EN 12874) and are issued with an ATEX certificate.

Connection: Thread, DIN EN-Flange, ANSI-Flange

Material availability: Steel zinc plated and chromated or stainless steel

Short time- and endurance burning or eccentric types for e.g. horizontal assembly: On request

* Zoekterm: vlamdovers, flame arresters, flammer