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better air chamber?

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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better air chamber?

Unread postAuthor: huntinggamo » Wed Mar 12, 2008 2:33 pm

Im trying to find an air chamber with these requirements:

must be metal (aluminum?) rated for preshure
needs to have atleast a 1" outlet
prefer a npt thread or something that can easily be converted to npt thread.
i would like it to have 50-100 Cubic IN volume.

any and all ideas are appreciated.
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Unread postAuthor: Fnord » Wed Mar 12, 2008 2:37 pm

You practically described a fire extinguisher in detail with that post.

Not sure what the threads on them are.
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Unread postAuthor: huntinggamo » Wed Mar 12, 2008 2:48 pm

i have thought of that, hard if not almost imposible to convert to npt threads without welding (that i know of) i know there is a few mods out there for fire erxtinguishers but i can not find anything with a big enough neck. my other idea was thishttp://www.catalinacylinders.com/ in a low preshure alluminum cylinder, this is ideal exept that i can not find a way to convert UNS threads to NPT. if anybody knows this that would be cool also. im in the process of speaking with this company to see if there is any way i can get them unthreaded and ill just have them taped myself.
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Unread postAuthor: psycix » Wed Mar 12, 2008 3:57 pm

Up to what pressure do you want it to go?
100 psi? 300 psi? 800? 3000?
Its all very different.
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Unread postAuthor: huntinggamo » Wed Mar 12, 2008 4:20 pm

it will be between 100 and 200 psi, 120-130 to be exact, but a want some room for error.
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Unread postAuthor: POLAND_SPUD » Wed Mar 12, 2008 4:30 pm

it isn't really difficult to find something that can hold 120 psi... problems start when you want to exceed 300 psi... :roll:
aren't threads for propane tanks the same as for fire extinguishers?? lol sorry if i am wrong I am just guessing
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Last edited by POLAND_SPUD on Wed Mar 12, 2008 5:55 pm, edited 1 time in total.
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Unread postAuthor: Hubb » Wed Mar 12, 2008 4:49 pm

If you have the tools and skills, you could construct one from copper pipe. If not, and you are not concerned about weight, you could build one out of steel pipe.
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Unread postAuthor: nivekatoz » Wed Mar 12, 2008 4:50 pm

I have seen some air tanks on ebay for scuba..There kinda small they call them pony tanks...Im not sure what threads are on them...I got a scuba tank from ebay and it has 1" npt threads on it but the tank is steel...Its sorta heavy thats why im not using it...
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Unread postAuthor: nivekatoz » Wed Mar 12, 2008 4:56 pm

You could also make a aluminum air chamber...Just look for aluminum pipe online...Thats what I did...I have a 2" aluminum pipe 12" long and I had it threaded with npt....and used regular plumbing fittings for the rest...Just a thought... :salute:
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Unread postAuthor: elitesniper » Wed Mar 12, 2008 5:33 pm

nivekatoz you dont need to double plost there's and edit button right there in the corner. You could by a potable carry air tank a 5 gallon one only cost 20 dollers :wink:
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Unread postAuthor: DYI » Wed Mar 12, 2008 5:50 pm

Most welding shops will have all sorts of tubes and pipes lying around. Just find the size you want, and get plates welded on either ends, then get any tapping or threaded fittings you want welded on done. This should be easily accomplished for under $50 if you can find a friendly welder, and there isn't much risk of failure with such low pressure unless the welder does an extremely poor job.

Also, could you try and make your posts look a bit better? It makes the forum look more reputable overall, and takes zero effort if you're fluent in English. If English isn't your first language, then don't worry about it.
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Unread postAuthor: the cats in the bag » Wed Mar 12, 2008 7:07 pm

You could just by a small refillable co2 tank. You can recharge them via air compressor and there really light weight. they sell them for like $15.00 at wal-mart.
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Unread postAuthor: Hubb » Wed Mar 12, 2008 7:12 pm

the cats in the bag wrote:You could just by a small refillable co2 tank. You can recharge them via air compressor and there really light weight. they sell them for like $15.00 at wal-mart.


This would work. I've successfully put a 3/8" npt pipe in one, after removing the tip. The problem with this application, however, is that it's not going to yield enough volume for the needs.
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Unread postAuthor: psycix » Thu Mar 13, 2008 7:11 am

For 120 psi you should just find some pressure rated pvc (sch 80 maybe) that is rated to hold that.
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Unread postAuthor: huntinggamo » Thu Mar 13, 2008 10:33 am

sorry about my grammer and the way my post looks, i curently have broken fingers on both hands so typing is a chalenge. im trying to build somthing that looks as profesional as posible, those tanks i found that i put a link to up top can be purchased unthreaded, so im just going to buy them there and have them threaded at a local machine shop. thank you all for your help and input.
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