[Jewelry making - Article 00071] - Re: [Orchid] Casting investment safety

[Ian W. Wright]

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>         Question: with a high volume blower on our ventilation system
>     (I believe it replaces all the air in the shop room once per minute
>     or faster, and vents to the outside) how long should we run the
>     vent fans before we remove the respirators after we've finished
>     working with the investment (quenching or investing)? 

    Hi, One point which doesn't seem to have been covered but which, from
    years involved with safety issues I know to be significant, is the
    discharge of extracted 'fumes'. If a simple ventilation system is
    used in a situation like this and, particularly in a built-up area,
    you may just be transferring the problem to other people and could be
    ultimately liable for that. In the case of the Legionnaires disease
    outbreaks (of which I have some personal experience), the casualties
    are seldom the people in the affected building, but are rather those
    who pass by outside. Similarly in this case, if you don't have a
    good and well maintained particle filter on the discharge from
    extract fans in your casting area, you could be blowing the
    microscopic particles of silica at passers-by (and maybe your
    families) with some force. It may be difficult for someone to prove
    in twenty years' time that their lung cancer is a direct result of
    walking past your workshop every day although I'm sure someone will
    try it but, if that is a member of your family who is 'infected' by
    working out in the yard while you are casting, would you be able to
    live with yourself? 

Best wishes,
Ian
Ian W. Wright
Sheffield   UK


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