[Jewelry making - Article 00221] - Re: [Orchid] Pressure booster and Natural gas

[Judy Hoch]

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    As I posted before, I use residential pressure natural gas with
    compressed oxygen. I purchased a special MECO low pressure gauge for
    my oxy supply which lets me set my oxy pressure to eight pounds,
    exactly. I bought it, and the MECO midget torch from a glass blowing
    supply house about 12 years ago. I have never found the need for oxy
    in any pressure above eight pounds. Is the problem obviated by the
    use of relatively low pressure with the oxygen? I use the ventilated
    tips almost exclusively.

    At one Catalog in Motion, a torch expert explained why the MECO
    midget worked so well. I asked because I was concerned that the low
    pressure wouldn't be enough to make the torch useful. He used the
    term venturi to describe how the torch worked. 

    The Venturi effect is a special case of Bernoulli's principle, in the
    case of fluid or air flow through a tube or pipe with a constriction
    in it. The fluid must speed up in the restriction, reducing its
    pressure and producing a partial vacuum via the Bernoulli effect. The
    Venturi effect is a special case of Bernoulli's principle in the case
    of fluid or air flow through a tube or pipe with a constriction in
    it. The fluid must speed up in the restriction, reducing its pressure
    and producing a partial vacuum 

    via the Bernoulli effect. A fluid passing through smoothly varying
    constrictions is subject to changes in velocity and pressure in order
    to satisfy the conservation of mass-flux (flow rate). The reduction
    in pressure in the constriction can be understood by conservation of
    energy: the fluid (or gas) gains kinetic energy as it enters the
    constriction, and that energy is supplied by a pressure gradient
    force from behind. The pressure gradient reduces the pressure in the
    constriction, in reaction to the acceleration. Likewise, as the fluid
    leaves the constriction, it is slowed by a pressure gradient force
    that raises the pressure back to the ambient level. (definitions from
    Wikipedia) 

    Now with all that, in 14 years of daily use, and having the gas
    inspectors look at what I'm doing and how I'm using the natural gas,
    I'm at a loss to understand why I need to add yet another piece of
    equipment to my studio. I'm with Judy Willingham - if someone can
    find one documented accident in a single jeweler studio attributable
    to lack of a pressure booster and flashback arrestor, I will
    re-consider. 

Judy Hoch
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