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high pressure vessels

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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high pressure vessels

Unread postAuthor: acoop101 » Wed Sep 19, 2007 1:02 pm

I was looking at these high presure spheres
http://www.aeroconsystems.com/plumbing/ ... pheres.htm
and was wondering if anyone knows where to get something like this that aren't stainless steel and could be used to make a spud gun? I just can't bring my self to pay that much
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Unread postAuthor: Fnord » Wed Sep 19, 2007 1:16 pm

I think I've mentioned this before. Somewhere.

Salad bowls+solder/small bolts.

It won't be good for more than a propane combustion, or at least I wouldn't trust it with more.
You could always try to aquire a de-commisioned nuke and use the blast containment sphere, which should be rated for several thousand BAR.
This of course is well within the capability/budget of an average teenager.
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Last edited by Fnord on Wed Sep 19, 2007 1:34 pm, edited 1 time in total.
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Unread postAuthor: acoop101 » Wed Sep 19, 2007 1:31 pm

I am a pressure vessle builder by trade but I haven't been able to find the steel half spheres, I only really need it rated to 150~ psi so it's not that much of a problem but no one makes them. I usually make vessels rated for up to 8000 psi.
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Unread postAuthor: Fnord » Wed Sep 19, 2007 1:41 pm

Well, if you're already in the industry, have you ever seen the lathes that are used to bend sheet metal into bowl or cylinder-shaped containers?

Basically a disk of sheet metal is spun and pressed against the outside of a die using either hand tools or some type of automaton.
I don't know if you would have access to anything like this, but maybe you could adapt a regular lathe in some way to suit this purpose. A bowling ball would be a good die, in this case.
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Unread postAuthor: acoop101 » Wed Sep 19, 2007 1:45 pm

I wish I had the sill and I wish my company had the equipment to do it. But I was going to make it out of 1/4 inch steel plate. I am always of the opinion that it is better to over build than to not build enough. I may just use a 9 gram co2 tank.
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Unread postAuthor: Fnord » Wed Sep 19, 2007 2:04 pm

Ok, I got another idea for you. I just realized I already had something sitting around that is kinda like what you are looking for.

This is a bouy from who knows where. Notice how it appears to be made of welded metal rings layered together. If you have access to a cutting torch/welder, this should be reasonably easy to construct. It will take some time though, especially if you want it too look nice.

Does it have to be perfectly round?
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