[Jewelry making - Article 01461] - Re: [Orchid] General safety in the workshop Info?

[James Binnion]

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>     a flashback arrestor is wise for a school as far as liability
>     goes, check valves, are far cheaper and just as reinforcing as the
>     flashback arrestor.(using both are overkill). 

    A check valve is not designed to act as a flashback arrestor. A
    check valve can and will allow a tiny amount of reverse flow when it
    seats. Also dust and foreign objects can cause it not to seat fully.
    If that reverse flow is burning gas then the flashback will continue
    along the hose. Use a real flashback arrestor forget about using a
    check valve as a flashback protection device. 

James Binnion
jbin AT mokume-gane.com
James Binnion Metal Arts
http://www.mokume-gane.com
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