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using pvc with high pressure CO2?

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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using pvc with high pressure CO2?

Unread postAuthor: JDP12 » Thu May 15, 2008 9:11 pm

Hey all, for my lever action and pump action shotguns, (yes you heard right)

I'm hoping to use PVC as the barrel and cartridges, but my only question is about the pressure. Since the gas (at 400 or 500 psi or so, ) is only being dumped into the PVC, it should be okay right?

Please correct me if I'm wrong
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Unread postAuthor: DYI » Thu May 15, 2008 9:16 pm

As long as, by PVC, you really mean ABS, copper, steel, brass, lead, bronze or aluminum, yes, it will be fine.

You wouldn't seriously use pipe with extremely low impact resistance, a very small safe operating temperature range, and extremely dangerous failure characterstics as pressure bearing parts on a very cold, constantly shocked CO<sub>2</sub> vessel, would you?
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Unread postAuthor: JDP12 » Thu May 15, 2008 9:20 pm

well........ i was only asking because i think goathunter used PVC on his MCS, and that's unregulated CO2, so i was just asking to confirm that.

if its not PVC, it looks extremely like it.
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Unread postAuthor: grumpy » Thu May 15, 2008 9:48 pm

unregulated co2 pressure is more like 850 psi or more depending on temperature.
oh and goathunter only used pvc for the barrel.
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Unread postAuthor: JDP12 » Fri May 16, 2008 4:27 pm

yea that's all i plan on using it for. I just wanted to be sure it would be ok.

Wait... you guys thought i would be dumb enough to use PVC as a chamber with high pressure CO2 ??i'm not that stupid

Thanks a lot..(lol)..

so it should be alright then.. if goathunter uses it on his and it hasn't blown up yet i'm assuming its safe and will move ahead with it
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Unread postAuthor: DYI » Fri May 16, 2008 7:50 pm

No, I was talking about the barrel. A PVC barrel failing would be very unpleasant, and the very low temperatures and shock loading certainly wouldn't help it any. What diameter of barrel are you using, and why don't you just use copper?
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Unread postAuthor: Davidvaini » Fri May 16, 2008 7:58 pm

3/4 pvc as a barrel that is not seals should work.
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Unread postAuthor: JDP12 » Fri May 16, 2008 8:45 pm

im not using copper, because i'm building this gun for a friend, and he wants PVC cuz its cheaper. I've been trying to talk him into copper because its safer, but he's a stubborn guy. i'll keep trying to talk to him.

David- what do you mean by is not seals?
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Unread postAuthor: Davidvaini » Fri May 16, 2008 9:45 pm

ilovetoblowthingsup wrote:im not using copper, because i'm building this gun for a friend, and he wants PVC cuz its cheaper. I've been trying to talk him into copper because its safer, but he's a stubborn guy. i'll keep trying to talk to him.

David- what do you mean by is not seals?


as in you cant have a plug or anything that fits too tightly as ammo.. Also you cant have an end cap or anything like that on your barrel...

3/4 pvc can only be used at those pressures if it is the following:

It is a barrel that doesnt have any super tight fitting ammo

It pretty much needs an area for the gases to escape.
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Unread postAuthor: bigbob12345 » Fri May 16, 2008 9:57 pm

I use pvc in the new barrel for my hybrid, its 1in in size and I have taken it uo to 7x(~700psi) without failure so i would say that you are fine.
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