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"Emptying the tank" is not as easy as you think ! Many a welder has gotton a surprise when he welded a "empty tank" Whether it be propane , gasoline etc the gas is usually mixed with some air and becomes very explosive !
Proper welding proceedures include filling the tank with water or inert gas before attempting to weld .
My local waste transfer station will not take any tanks originally containing propane etc !!!
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And Watson , bring your revolver !
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