[Jewelry making - Article 00321] - [Orchid] Oxygen/gas Torch lighting

[John Burgess]

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    G'day - I too am a bit fed up with this one!    But if you have your
    torch fitted with an anti-blowback device, the problem doesn't
    arise.   One device is the result  of   the invention of the miners
    lamp which inevitably had a naked flame and thus cause the methane
    (fire damp) in mines to explode.   So it was found that if you
    enclosed the flame in a 'container' of metal gauze there would be no
    explosion. We used to do this at school:   We would turn on a bunsen
    burner and hold a piece of gauze over it, and you could light the
    gas/air mixture coming through the gauze without a flame appearing
    at the bunsen itself..  So even a bit of metal gauze in the pipe
    would help avoid blow-back.   (can't remember if it was Haldane or
    Kelvin who thought of the miner's lamp)  They also use a one way
    valve in today's devices.   Your friendly welder's supply store
    would sell you  the device which aren't very expensive, and would
    fit on the pipeline close to the torch. 

-- 
Cheers for now,
John Burgess;   johnb AT ts.co.nz of Mapua, Nelson NZ


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