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Flash Back Arrestors / NRV for Gases

FLASH BACK  AND  FLAME ARRESTORS

Dry Flashback Arrestors typically use a combination of different safety elements to stop a flashback or reverse flow of gas. They work just as effectively with any orientation, need very little maintenance, and to be installed at the gas regulator or gas outlet / tapping point. A flash back arrestor is a safety devise that shuts off gasa flow in event of flash back. Flashback is the combustion of a flame mixture that can occur within your gas management system. This can travel back through the line of your gas management system to you gas source if a flash back arrestors is not in line. A Flash Back Arrestor shuts off gas flow and extinguishes the flame before it can reach your gas source. Several factors can cause flash back, including failing to purge line properly, using improper pressure, leaks in your gas management system and improper system operation. We recommend using a Flash Back Arrestor on your fuel line. The flashback arrestors are suitable for most technical gases (fuel gases) such as acetylene, hydrogen, methane, propane, propylene, natural gas, LPG, and butane as well as oxygen and compressed air

WHY SHOULD ONE USE FLASHBACK ARRESTORS ?

The reason for using a protective devise such as a Flash Back Arrestor on a fuel gas line or even on a cylinder are :

1)      Safety of property and human lives.

2)      The flashback occurs under various conditions.

3)      The flashback occurs inside the pipeline or vessels.

4)      The flame moves through a vessel or pipe.

5)      The flame velocity increases as it moves through these p[ipe or vessel, and if the pipe is long enough the velocity can increases to detonation levels, which are supersonic.

 

HOW DOES A FLASH BACK ARRESTOR WORKS ?

 

Flash Back Arrestor is a simple devise, which quenches the flame using the following methods :

a)      By reducing the velocity of the flame, reducing  the flame velocity even lower than the minimum flame velocity of the fuel gas.

b)      Stops the flame propagation into or through a pipe. By placing a flame arrestor at the end of the flammable mixture pipe feeding a flare or burner, flame can be prevented from moving into the pipe regardless of the mixture velocity.

c)       By  blocking the flow of fuel gas in the opposite direction by acting like a non-return valve.

 

WHERE SHOULD A FLASHBACK ARRESTOR BE PLACED ?

 

The flashback arrestor should be placed at the closest point to the flame, or be placed of the main pipe line, and also on the fuel gas bank, vessel, cylinder.