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CO2 in pvc?

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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Unread postAuthor: noname » Sun Oct 29, 2006 3:39 pm

I wouldn't go over 80 psi with that, with all the DWV that's there. And where have I seen that red and black paint before? :lol: It's not painted the same way though. Oh well, I still had to say that.
And this is semi/full auto how? What kind of loading system is there?
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Unread postAuthor: joannaardway » Mon Oct 30, 2006 7:35 am

Sorry to say it, but aren't some/most of those fittings DWV?

And it looks to me as if the sprinkler valve is on the wrong way round, but I don't know which way it's meant to fit on to your launcher. I'm probably wrong about this bit anyway.

It's very nice, I'm just confused.
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Unread postAuthor: noname » Mon Oct 30, 2006 10:46 pm

Beat you to it. :wink:
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Unread postAuthor: joannaardway » Tue Oct 31, 2006 6:31 am

Ah. Damn - second page that I didn't see.

Whatever. At least I can recognise the DWV stuff now (not that it ever matters to me.)
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Unread postAuthor: THEMOST » Wed Nov 01, 2006 8:20 pm

uhh it's kinda funny asking whats on my own gun. What's DWV? :lol:
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Unread postAuthor: noname » Wed Nov 01, 2006 9:48 pm

It's the "crazy" PVC. The Ys and weird sized joints with really short socket depths.
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The things are circled that are DWV.
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Unread postAuthor: ProfessorAmadeus » Wed Nov 01, 2006 9:51 pm

The cannon looks cool but next time look for pressure rated stuff because the real fun starts when you take it over 100 psi :twisted:
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Unread postAuthor: kyle1292 » Thu Nov 02, 2006 9:10 pm

yea i was wondering that for a while too thx for the info
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Unread postAuthor: SpudStuff » Thu Nov 02, 2006 9:14 pm

Usually Sch 80 fittings look like the DWV except your wallet knows when you but SCH 80.
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Unread postAuthor: THEMOST » Fri Nov 03, 2006 8:13 am

I've taken another one that I made over 120psi and I cracked a rubbermade trashcan with a paintball. Im not able to take it over like 140 because of the valve. It can only handle 150psi of H20 blast pressure. Air would go faster so I would use like 135psi otherwise it could break the valve. I m not worried about the fittings, the smaller ones have higher psi ratings, like 600psi.

Wait, what are the pressure ratings for DWV?
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Unread postAuthor: potatoflinger » Fri Nov 03, 2006 9:51 am

If i were you, i would not use the co2 for the gun, but you can find a person that will fill up your co2 tank with air, that way it is not cold, but it is still in the same size container.
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Unread postAuthor: joannaardway » Fri Nov 03, 2006 10:54 am

DWV pipe and fittings are never rated, unless stamped as such.

Some pipe is odd in that it is listed as DWV, but has a rating of about 260 psi or so.

However, your fittings wouldn't have been rated. It might have taken about 100 psi without too much risk.

However, I am not in any way promoting you doing that. If you do that and end up with PVC nose and tongue piercings, I will not be held responsible. I am suggesting that it might be possible if done and checked carefully.

The cold from CO2 isn't really a problem if it has been injected fairly slowly - that causes less temperature drop.

CO2 is perfectly safe to use if correctly done. The biggest risk is accidentally missetting your regulator and your joints failing with excess pressure.
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Unread postAuthor: THEMOST » Fri Nov 03, 2006 4:16 pm

joannaardway, so with a remote coil and a high pressure ball valve it would be completely safe? :P

This is the idea that I was going to use. It goes: CO2 tank --->remote coil--->ball valve--->PVC tank. Im not sure if Id put another ball valve in just for safty or not though.
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Unread postAuthor: noname » Fri Nov 03, 2006 9:06 pm

Put another one in. Open the first one like on a propane meter, close it, open the one closer to the tank, close it, and keep adding smaller amounts that way. It won't be as cold and you'll be safe.
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Unread postAuthor: SpudStuff » Fri Nov 03, 2006 9:09 pm

0 PSI. It is for Drain, Waste, and vent.
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