[Jewelry making - Article 01169] - Re: [Orchid] Propane Safety

[Milt Fischbein - Jewellery Artist]

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Kirstin

    You were wondering what the safety reason is for not having a large
    BBQ sized propane tank located in your home.... 

    Propane tanks are equipped with a spring loaded pressure relief
    valve. This is required by law to prevent a propane tank from over
    pressuring and ripping open. When a propane tank is overfilled
    (especially in cold weather) and brought inside into a heated home,
    or left in the sunshine by a window, the liquid propane in the tank
    expands and vapourizes and pressure starts to build up in the tank.
    The relief valve pops open and lets some of the propane out of the
    tank to lower the pressure inside the tank. Once the pressure in the
    tank drops to a safe level, a spring on the valve pops it shut. This
    works just fine if the tank is located outside as the tank
    manufacturer intended, since the propane gas will disperse
    harmlessly, but not so OK inside your home. Once the relief valve
    pops open, it will not close until the pressure in the propane tank
    comes back to a safe level.  That means you can have an uncontrolled
    release of large amounts of propane in your home. This is one of the
    main reasons that propane BBQ tanks should never ever be stored
    inside your house. 

Regards
Milt Fischbein 
Calgary Canada

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