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homemade mini co2 tanks.

A place to ask general spud cannon related questions.
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Unread postAuthor: djt » Sun Jun 25, 2006 9:14 pm

im not sure. it would have to be tested. but i have seen some little chunks in water in a 2 liter make it explode, which is around 170 psi, and this metal thing will be smaller and more dry ice possibly.

edit: true professor amadeus it might be hard to find. i bet there has to be some kind of valve that can handle that for industrial purposes. can a brass ball valve? cause you could always just attach the little tank to the big one like a propane injection system.
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Last edited by djt on Sun Jun 25, 2006 9:21 pm, edited 1 time in total.

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Unread postAuthor: D-Roc » Sun Jun 25, 2006 9:19 pm

You're going to have to find out how much CO2 a 1in. block of dry ice releases first.

Build a small tank, put a pressure gauge in it, and throw in a measured piece of dry ice. Then see how much PSI that piece of ice releases.
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Unread postAuthor: djt » Sun Jun 25, 2006 9:41 pm

yep thats how it has to be done cause i cant find any facts on how much gas dry ice releases.
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Unread postAuthor: carlbelcher » Sun Jun 25, 2006 9:56 pm

The pressure that co2 liquefies at varies depending on the temperature but it’s normally around 850psi but I've seen it as high as 1000psi. I use hydraulic fittings on my robot's pneumatic system that are rated to at least 1500psi for safety.

Check out this hydraulic valve:

Image

It's rated to 3000psi and it has SAE 16 ports which are about 1" if you adapt them to NPT. But it's kind of pricey $89.95.

http://www.surpluscenter.com/item.asp?UID=2006062521510310&item=9-6115&catname=hydraulic
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Unread postAuthor: )DEMON( » Mon Jun 26, 2006 2:14 am

A ball or butterfly valve will work, the heavy duty ones.
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Unread postAuthor: CS » Mon Jun 26, 2006 4:47 am

carlbelcher, your forgetting that it will freeze the valve open and dump the ~850-1000 PSI you talk of into the chamber grenading it. Nice try, but try again...
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Unread postAuthor: carlbelcher » Mon Jun 26, 2006 4:51 am

No, that valve works great with co2. In fact I've been using it for over three years on my robot with NO problems. Even liquid co2 strait out of the tank will not freeze it open.


EDIT:

I was also thinking more as a main valve for a full co2 pressure steel cannon.

For a main tank valve any hydraulic valve should work here is a 1/4" rated to 5000psi.

Image

http://www.surpluscenter.com/item.asp?UID=2006062604544875&item=9-5540-4&catname=hydraulic
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Unread postAuthor: )DEMON( » Mon Jun 26, 2006 5:56 am

Robot?
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Unread postAuthor: Mihlrad » Mon Jun 26, 2006 6:42 am

em... for all the hassle of getting the dry ice machine, getting the dry ice, getting and cutting the pipe and drilling it for a shrader making sure it doesnt leak, etc etc, going to be way more work then just buying the cartridges? I mean i understand where you are coming from but to do all that work, and who knows what a dry ice machine cost to rent, it may be less costly in the long run, but how many do you possibly need?
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Unread postAuthor: )DEMON( » Mon Jun 26, 2006 9:42 am

Wheres the challange in that?
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Unread postAuthor: Mihlrad » Mon Jun 26, 2006 10:25 am

... lol.... well with the idea of making them, my wallet personally cant stand up to the challenge.
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Unread postAuthor: )DEMON( » Mon Jun 26, 2006 2:49 pm

I found this link, http://www.wittemann.com/gen.htm and thought it might be interesting to some people,it explains a bit about C02 production. You can buy your own system but no dought it will be expensive.
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Unread postAuthor: beebs111 » Mon Jun 26, 2006 6:48 pm

he he, steel piston, now thats a concept :D
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Unread postAuthor: carlbelcher » Mon Jun 26, 2006 9:46 pm

)DEMON( wrote:Robot?


Ya, Apocalypse my 340lb combat robot, I've been testing a full co2 pressure pneumatic flipper system. It uses that valve to fire a hydraulic cylinder with co2 pressure.

Image
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Unread postAuthor: Shrimphead » Mon Jun 26, 2006 11:13 pm

What are the dimensions on that robot? 340 lbs! Seems a little unlikely to me.
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