[Jewelry making - Article 01176] - [Orchid] Little Torch Oxygen Use

[Milt Fischbein]

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    I recently purchased a little Torch which I have set up with
    disposable propane and oxygen bottles. I am finding that the oxygen
    gets used up very quickly.  I am now on my fourth bottle of oxygen
    and still on the first bottle of propane. The propane bottle is 400
    grams and the oxygen bottle holds 40.1 grams.  These are the
    Bernzomatic type small disposable cylinders. At $10.00 (Canadian) per
    bottle of oxygen, the cost is much higher than I would have hoped. 

    A couple of months ago I did a combustion calculation, balancing H,
    C and O molecules (I'm a Chemical Engineer) and worked out that it
    would take about 36 (40 gram) bottles of oxygen to one (400 gram)
    bottle of propane. I am hoping that I made a mistake. 

    Can any users of the little torch please tell me what their actual
    experience has been. i.e. how many bottles of oxygen have you used
    per bottle of propane and what is the actual propane weight of gas
    in the bottles? 

    Also, I am thinking of switching over to compressed air and propane.
    (I do know about the safety hazards of later switching back to
    oxygen)  Does anyone out there run propane/ compressed air with a
    little torch and how do you do it. 

Thanks
MILT Fischbein
Calgary Canada

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