A flashback arrestor or flash arrestor is a special gas safety device most commonly used in oxy-fuel welding and cutting to stop the flame or reverse flow of gas back up into the equipment or supply line and it prevents the user and equipment from damage or explosions. These devices are mainly used in different industrial processes where oxy-fuel ...
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http://en.wikipedia.org/wiki/Flashback_arrestor
An essential safety device which prevents flashbacks travelling into the regulator or cylinder. Flashback arrestors are specific to each gas and must not be interchanged.
Found on
http://www.bocindustrial.co.uk/bocindustrial/technical/glossary/f.html
A safety device fitted in the oxygen and fuel gas system to prevent any flashback reaching the gas supplies.
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https://www.encyclo.co.uk/local/20500
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