Can butane be transferred from one pierceable canister to another when its below the boiling point of butane?
I use pierceable butane canisters for cooking outdoors:
Given that butane boiling point is 30 to 34 °F, is it safe to punch a hole in the canister when the outside temperature drops below 30 °F and transfuse the liquid butane to another canister?
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No.
The butane will vaporize below the boiling point, just as water vaporizes below 100°C.
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No. There is a safety system in the newer C206 canisters that should prevent you from emptying a pierced can, unintentionally or not. It remains to be found if this works at low temperature and pressures though.
However, the C206 GLS cartridge has a new integrated flow reducing system, the Gas Lock System, which is compliant to the new European standard EN 417:2012 legislation. The system prevents the majority of residual gas from escaping the cartridge when accidentally disconnecting it from the appliance, thereby also preventing flare-ups
Bear in mind, it is more than likely you'll find some C206 canisters filled with a butane/propane mix (the can pictured in the question shows one of those, note the dutch butaan/propaan mengsel on the can) and since propane's boiling point is a whopping -43°F (-42°C), you'll certainly trigger the safety system when it starts escaping.
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