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Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
He is right, there is a automatic pressure release valve in fire extinguisher as a safty feature.
Mythbuster tried to burst a fire extinguisher in a camp fire but never did because the safty valve opened releasing all the gas.
I hope you are not suggesting that what Mythbusters did to another fire extinguisher at the other side of the world says anything about how a different fire extinguisher will behave under completely different conditions.
Did they repeat the experiment several times with the same pressure and no heat applied to check that it was not the temperature itself that triggered the release?
Nope, they just put the fire extinguisher in a fire. They tried one without burst plate, too. It took nine minutes iirc until it bursted (which was quite loud, though they didn't use a CO2 fire extinguisher). So maybe 1 percent of science there ;) still very entertaining....
Edit: here's the link to the mythbusters episode on the fire ext:
Registered Member #193
Joined: Fri Feb 17 2006, 07:04AM
Location: sheffield
Posts: 1022
Liquid CO2 in a fire extinguisher will only exert about 70 bar pressure, or a bit more in hot weather. The people who make fire extinguishers and who know what they are doing chose to get a gas bottle rated for 950bar then derated it with a burst disk to 250 bar for use at about 70 bar. If they thought that a bottle rated for and tested to less pressure would do the job safely they would have used one- it would be cheaper. They didn't. Since you are asking this question it's fair to assume that you don't really know what you are doing.
Do you really want to ignore the custom and practice of those who know about this stuff and use this tank at more than 70bar?
Well I never really thought of really using it at above what it was used before. I was just curios if someone knows what the valve's rated in relation to the tank.
On the other hand fire extinguishers are designed (imo) to withstand high(er) temperatures as in a case of fire noone want's the extra danger of exploding ones.
Think I'll look for a paintball tank or similar, as they are much lighter.
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Fire extinguisher as high pressure tank?
