Dry Ice propelled gun

[Mitch21]

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

[qwerty]

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.

[Mitch21]

Yes we are using 5mm thick galvanized steel tanks, a safety blowout valve, and a regulator to keep track of the pressure build up.

[john bunsenburner]

Work out how much is needed first and then use that, be careful, and get a better valve than a ball valve.

[Mitch21]

What kind of valve could I use that will take such pressures?

[qwerty]

high pressure piston valve?

[john bunsenburner]

Normal piston valve, its only 10bar(i would use 20 instead).

[qwerty]

QEV? message to short. Not anymore

[Mitch21]

But we are unable to get the parts to make a piston valve.

[qwerty]

Well then what about a QEV there just premade piston valves that you can buy.

[Mitch21]

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.

[qwerty]

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

[Mitch21]

Haha thanks! I can confirm i have seen another South African here, so im the second!

[qwerty]

whos that? that then

[Mitch21]

BlackH... here a link to his thread http://www.spudfiles.com/forums/bh-2400 ... 14078.html.

Hes quite a skilled builder