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Using a fire extinguisher as an air reservoir.

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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Using a fire extinguisher as an air reservoir.

Unread postAuthor: Dig_Gil » Sun Jul 20, 2014 3:24 pm

As the title suggests, I've got a 3.1L fire extinguisher which I intend to use as a reservoir for the pneumatic I am building. It tolerates way more pressure than a air compressor! My idea is to remove its valve and replace it with a quick connect fitting so that I can switch it between pump (fridge compressor :P) and launcher in a simple way.

My problem is that the extinguisher's valve just won't get unscrewed. Is there something dumb I should know? I've forced it with wrenches, a bench vise, I've poured lubricant into it, hammered it and even put my weight on a lever and it seems to not even budge! I've considered it might have some sort of resin around the threading, but I dunno.

I've thought I should drill the valve from top to bottom, but I'd rather preserve its threadings undamaged for reference if possible.
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Re: Using a fire extinguisher as an air reservoir.

Unread postAuthor: bravootome » Sun Jul 20, 2014 11:42 pm

Dig_Gil wrote:My problem is that the extinguisher's valve just won't get unscrewed. Is there something dumb I should know? .

Had you emptied the fire extinguisher first ?
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Re: Using a fire extinguisher as an air reservoir.

Unread postAuthor: Dig_Gil » Mon Jul 21, 2014 9:40 am

Yes. It was originally used for fire drills and fire equipment demonstrations. I checked myself.
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Re: Using a fire extinguisher as an air reservoir.

Unread postAuthor: hawktalk » Mon Jul 21, 2014 9:41 am

i used one as a reservoir i had the same problem they do put sealant like thread lock its a [female doggy] to get off. ended up forcing the damn thing of with all my strength and a vice. make sure you are un-tightening it in the right direction because some are left handed threads and some are right. in your case if you want to make it into a stand alone tank then i would cut it off and find someone to Tig weld a thick plate on the opening probable be a good idea to put some reinforcing inside the neck so a bigger weld can be achieved. good luck
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Re: Using a fire extinguisher as an air reservoir.

Unread postAuthor: Dig_Gil » Thu Jul 24, 2014 6:49 am

I've accomplished removing the valve and for those whom it might be of interest and for completeness' sake, here's what's I've done:

I borrowed someone a comically large spanner, more specifically that thing that wikipedia calls a pipe wrench (in my language we call it "chave de grifo"/"griffin wrench"). I grasped the reservoir at the vise, and twisted the valve with the 2/3 of a meter length of the wrench (I still find it quite amusingly big). The valve's metal bent and torned and gave up. After about half a turn on the threadings, it was easy to remove by hand.

If you are interested in knowing how I carried on with the reservoir ask away!
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