Evacuate it with a high vacuum pump running outdoors with a blower blowing the propane away from the pump's motor. When you reach a really good vacuum, say, 500 microns as indicated by a thermistor gauge, break the vacuum. All residual propane has been boiled to a gas state (provided the container no longer has any cold spots) and will no longer leech out of the metal. The concentration of propane is now 0.07% (30 times leaner than the lower flammability limit) and the mixture is completely non-flammable.
The key is that propane is only explosive at concentrations between 2% and 10%. Below 2% you can blow it right into a flame and it won't burn. Above about 10% concentration in air, it will not burn either... but it will further dilute in air and become an explosive mixture.
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Thread: what's the safest way.......
05-04-2010, 01:25 AM #11
80% of failures are from 20% of causes
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