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Dry Ice propelled gun

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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Dry Ice propelled gun

Unread postAuthor: Mitch21 » Thu Aug 27, 2009 1:57 pm

Hi all my friend am I are about to proceed in building a pneumatic cannon that will use dry ice to have a constant source of pressure. We will be using a galvanized steel tank and will hopefully be able to run it at about 10 bars. The firing mechanism will be a ball valve, what are your thoughts on this? Anything you would advise or not advise?

Thanks
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:00 pm

nooooooo!!!!!! dry ice can genarate huge pressure not 10 bars more like 800 psi
dont bother to even attempt this gun compressed co2 is very dangorous.
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:06 pm

Yes we are using 5mm thick galvanized steel tanks, a safety blowout valve, and a regulator to keep track of the pressure build up.
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Unread postAuthor: john bunsenburner » Thu Aug 27, 2009 2:12 pm

Work out how much is needed first and then use that, be careful, and get a better valve than a ball valve.
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:18 pm

What kind of valve could I use that will take such pressures?
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:21 pm

high pressure piston valve?
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Unread postAuthor: john bunsenburner » Thu Aug 27, 2009 2:23 pm

Normal piston valve, its only 10bar(i would use 20 instead).
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:25 pm

QEV? message to short. Not anymore
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:25 pm

But we are unable to get the parts to make a piston valve.
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:32 pm

Well then what about a QEV there just premade piston valves that you can buy.
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:35 pm

But it will be very hard for me to find one as I am in South Africa, so I think I will have to stick to ball valve as its available. A ball valve will take the pressure but I undestand that it will decrease the performance due to the slow release.
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:44 pm

you could make it spring loaded were a spring pulls it open

BTW i think your the first african on spudfiles i might be wrong but welcome to spudfiles anyway :)
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:47 pm

Haha thanks! I can confirm i have seen another South African here, so im the second! :o
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Unread postAuthor: qwerty » Thu Aug 27, 2009 2:49 pm

whos that? that then :?
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Unread postAuthor: Mitch21 » Thu Aug 27, 2009 2:52 pm

BlackH... here a link to his thread http://www.spudfiles.com/forums/bh-2400-pro-updated-fan-controler-and-psi-guage-t14078.html.

Hes quite a skilled builder
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