Ok I guess my most dangerous tool is a pump I used to empty a 12 Imperial
(as opposed to US) gallon fuel tank that was clogging filters with rust. I
had the pump resting on the top of a 5 gallon drum using my jump leads to
power it, as the drum filled I needed to stop the pump and just released the
croc clip at the pump, the arc ignited the gas fumes in the neck of the drum
and I could see it dipping into the drum. I screwed on the cap for the drum,
fit the fuel filler cap dragged the drum a short distance from the car (to
save the car if the worst happened!) then legged it. Had a coffee and
watched the news then went back and peered round the corner drum and car
still there as anticipated. Removed the battery end for the remainder of the
job, no more trouble!
I was banking on the fact that the combustion would rapidly use the small
quantity of air in the drum then snuff itself, thankfully I was correct!
----- Original Message -----
Subject: RE: Most Dangerous Tool
> > Could the flame have backed up into the propane
> > canister as I unscrewed it?
> Nope, there's no air inside the canister, so the propane can't burn in
> Part of the reason propane is relatively safe, it has a fairly narrow
> flammable mixtures. In effect, it only burns at the interface between
> air, where the mixture is just right. (Unless of course you've gone to
> lengths to mix it just right, like with a carburetor.)
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