[Jewelry making - Article 00118] - Re: [Orchid] Lighting the Little Torch

[Peter W . Rowe]

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>        Interestingly enough, I checked my Oxy-acetylene Weldor's
>     Handbook but could find no reference to shut off sequence! Any other
>     views out there? 

coralnut,

    If you shut the gas off first, leaving the oxygen going, more than a
    few torches will give you a really loud BANG... 

    Shut off the oxygen first, so you've then got a gas only gentle
    flame.   Then the gas gets shut off.  There should be no glowing
    anything, anywhere except just at the torch tip perhaps, since that's
    the only place there was a flame in the first place.  With the oxy
    off first, the gas cannot flash back or ignite anywhere other than
    outside the torch.  If you shut off the gas first, any remaining gas
    will be able to be ignited within the torch as the mix gets more and
    more oxydizing during shutoff. 

Peter



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