A Flame arrestor is a device which allows gas to pass through it. But stops flame in order to prevent a longer free or explosion.

End-of-line, Vent-to-atmosphere type

Most flame arrestor applications and designs fall into two major categories. One group consists of end- of – line flame arrestors, also known as the vent-to- atmosphere type.

In-line, deflagration or detonation type

The other major category consists of in-line flame arrestors, also known as deflagration and detonation flame arrestors. (Speaking non-technically, deflagration means rapid burning, and detonation means explosion.) These units are installed in pipes to prevent flames from passing.

Figure : An in-line flame arrestor used in an end-of line application (below a pressure and vacuum relief valve for a liquid storage tank)

Most in-line flame arrestor applications are in systems which collect gases emitted by liquids and solids. These systems, commonly used in many industries, may be called vapor control systems. The gases which are vented to atmosphere or controlled via vapor control systems are typically flammable. If the conditions are such that ignition occurs, a flame inside or outside of the system could result, with the potential to do catastrophic damage.

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