[Jewelry making - Article 01362] - Re: [Orchid] Use, Maintenance and Storage of Acetylene Torch

[John Donivan]

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    Yes, evdan AT att puts it in a nutshell - with reasonable care having
    gas tanks can be safe.  I would add a few thoughts - The amount of
    acetyline gas that needs to leak into a room for it to ignite by a
    spark is HUGE - you couldn't be in the room at all with the
    proportion of gas/air needed to ignite. There is a number
    somewhere, but its like a 50/50 mix. That doesn't mean you should
    be casual about it, just don't be paranoid about it.  Two reasons
    the fire dept. hates hydrogen is it's eagerness to combine with
    oxygen, and that it is odorless - they don't inject an odor into it
    like natural gas ( which is naturally odorless).  Even more
    dangerous, though, is oxygen, and is why you need to chain all tanks
    to something - at 3000psi, if a full o2 tank falls over and that
    valve breaks off, it will take off literally like a rocket and go
    through you, and the building, and the next building, and the next. 
    Lastly - if you read the regulator, it says, "Use No Oil".  Brass
    isn't usually oiled, anyway, but the real reason is that, at that
    3000psi of oxygen, oil will spontaneously combust - there's a mess
    for ya..... 


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