[Jewelry making - Article 00095] - Re: [Orchid] Pressure booster and Natural gas

[judymw]

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Hello Orchidians,

    When this concern first surfaced, I discussed my use of NG without a
    flashback arrestor with my local gas service people. They were made
    aware of the use of compressed oxygen mixed with NG through a hand
    torch, and had no problem with it. Our residential NG line pressure
    is barely a quarter pound. Perhaps that makes a difference? I set up
    my torch identically to that of one local jeweler downtown - no
    pressure boosters or flashback arrestors... of course, this is a
    small town and there aren't very many jewelry stores. 

    Your comment caused me to do an internet search for such accounts
    using "jeweler gas meter explosion" - no results that fit, other than
    Orchid postings. Lots of explosions related to gas leaks, damaged
    meters, etc. I would appreciate the opportunity to read more about
    the circumstances, but so far, have not found any reported. I'm
    beginning to think this is an urban legend. 

    My understanding of situations that would allow a flashback to go to
    the meter are related to the use of large volumes of compressed
    oxygen. The scientific glass blower at the university uses huge
    volumes of NG and compressed oxygen - his lab is suitably equipped
    with a pressure booster and flashback arrestors. I can see where
    needing high temperatures for large casting operations or platinum
    work could require those fixtures. Could such meter explosions have
    begun to occur when jewelers started commonly working with PT? 

    Specific information would be helpful. Inquiring minds want to know.

Judy in Kansas
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