cutandshut
Member
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I was just thinking (dangerous I know) why do we have flashback arrestors on the oxygen regulator when it's a non-flammable gas?
- Thread starter cutandshut
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pedrobedro
Man at Matalan
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Because it is being mixed with a fuel gas at the torch which then becomes a flammable mixture.
brightspark
Member
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- yarm stockton on tees
if the acetylene mixes with the oxygen in the pipes u can get a burnback hence it can only go as far back as the arestors
its only happened to me once. one way checkvalves are fitted in the lines but that doesnt guarantee it 
when they are reset and u turn the torch back on a lot of soot flows out of the nozzle 