[Jewelry making - Article 00533] - Re: [Orchid] Using MAPP gas for silver work?

[Randy Smith]

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    I posted this once before, here it is again for the newcomers, with
    an addition for MAPP. 

    When you convert from Acetylene to Propane or any other petroleum
    based fuel, be sure to change your hoses. Acetylene is not a
    petroleum based fuel and so most hoses for acetylene are rubber. The
    petroleum based fuels will dissolve the rubber over time, gum up
    your gages and clog up any small tips. 

    Until recently, the tanks for acetylene did not have to be inspected
    since the pressure was only 300 psi. The federal government stuck
    their nose in the business, now there is inspection of Acetylene
    tanks. Some of these tanks have been around for many years, the
    earliest ones were filled with asbestos, (acetylene needs to be in a
    honey-comb structure to keep it stable). Any asbestos filled tanks,
    or dinged tanks have to be replaced. This has caused undue hardship
    on the gas companies, they have to raise the price of Acetylene to
    cover the price of the new tanks. 

    They are looking for a new fuel combination that will have the heat
    of acetylene but not the cost. They are experimenting with
    Propolene, Chemelene, etc, which are Propane with other fuels added
    (Hydrogen, etc..) in order to get higher heats. All of these are
    petroleum based fuels and will dissolve/make soft your hoses over
    time. Hose replacement for the gas line is only about $8.00 for 8
    feet of line. 

    Acetylene hoses are Grade "R" and fuel gases are Grade "T". 

    MAPP gas is a combination of two gases, a Propyne-allene mixture.
    Propadiene mixed with methyl acetylene. 

    http://tinyurl.com/24f458 

Love and God Bless
randy
http://www.rocksmyth.com

 
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