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Fire extinguisher

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: airman » Wed Dec 17, 2008 9:45 am

john bunsenburner wrote:Me, being a curious nerd, once watched how they refilled our schools expired chemical fire extinguisher. What the guy did he had these co2 cartidges and just connected them out sides, there was a little shhhh sound and then he dis conected it. If my memory is correct that is, but why dont you jsut use an old bulk tank i got 7 of them lieing around and have no use fore them and they have normal theads, ask in an aquarium store.


I have no idea where to find a tank. It has to hold at least 200 psi and be small and lite enough.
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Unread postAuthor: john bunsenburner » Wed Dec 17, 2008 11:34 am

Ok well 300g is some what light it holds 250bar(about 4000psi)so pressure is no problem.. ask in an aquarium store as i said or get an iron tube and two end caps and then you have a pretty strong tank.
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Unread postAuthor: airman » Thu Dec 18, 2008 9:59 am

What do I ask for in an aquarium store? What are those tanks for?
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Unread postAuthor: CpTn_lAw » Thu Dec 18, 2008 10:24 am

2kg CO2 extinguishers are constantly pressurized to 80 bars. that is 1160 psi. I think you'll find a use for it.
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Unread postAuthor: Hotwired » Thu Dec 18, 2008 11:13 am

That must be a heck of a hot place those 2kg extinguishers are stored. At room temperature co2 turns to liquid in the realm of 60 bar. Maybe that's the rated working pressure ?
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Unread postAuthor: airman » Thu Dec 18, 2008 12:35 pm

I don't know if I've mentionned it but I need something not too big and light. I don't want to make a cannon but more like a gun or small rifle.
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Unread postAuthor: dungdue0 » Thu Dec 18, 2008 1:25 pm

I used a 8 dollar dry chem fe. all i did was drill and tap.

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