[Jewelry making - Article 00323] - Re: [Orchid] Lighting the Meco Midget Torch

[Peter W . Rowe]

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>        Now, obviously this is not what is supposed to happen, but I
>     don't know which part of the system is likely to be at fault. Can
>     anyone help? 

    The first thought is that you may be trying to use a tip that's not
    as compatible with natural gas/propane as it should be.  some of the
    very small orifice tips can be harder to light.  but the standard NG
    tips shouldn't do this.  They're characterized by a central main
    orifice in the tip, surrounded by several smaller "preheat" slits. 

    But your varying pressure sounds to me like a regulator that's not
    working right. 

    Also, I'd wonder just what these minimum pressures actually are.  If
    you're using regulators intended for higher volume use, perhaps the
    appropriate pressures for the midget are just at the very low end of
    your regulators. Many regulators, especially single stage ones, will
    have some trouble being stable at the very low end of their range. 

    I'd guess that with most tips, you'll want oxy pressures of maybe 10
    psi, or a bit more for larger tips, and gas pressures of 6-10 psi to
    start with.   So if your regulators want to just start off
    deliverying 15 psi at their lowest setting, then you'll have troubles
    such as you describe. 

Peter


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