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Basic coxial

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: WOW!! » Thu Apr 19, 2007 2:55 pm

Its threads, it so I can get access to the piston.
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Unread postAuthor: AmYisroelChai » Thu Apr 19, 2007 4:24 pm

Thankx...Ok thats what I thought. But 4"?! isnt that a pain to seal tight enough to stay pressurized. Do you have plumbers wrenches that big? OR just allot of teflon tape would work too.

But just one last question? I have a length of 4" PVC (my brothers a plumber I get scraps) I dont have it in front of me now but i am sure it was rated for 150PSI or around there. Is 4" not safe to 125PSI? I noticed you stopped at 50 PSI. Why?
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Unread postAuthor: scatdawg » Thu Apr 19, 2007 9:55 pm

nice cannon. coaxial rocks!
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Unread postAuthor: Blitz » Thu Apr 19, 2007 10:47 pm

AmYisroelChai wrote:Thankx...Ok thats what I thought. But 4"?! isnt that a pain to seal tight enough to stay pressurized. Do you have plumbers wrenches that big? OR just allot of teflon tape would work too.

But just one last question? I have a length of 4" PVC (my brothers a plumber I get scraps) I dont have it in front of me now but i am sure it was rated for 150PSI or around there. Is 4" not safe to 125PSI? I noticed you stopped at 50 PSI. Why?


It's probably rated for a bit more than that. Most schedule 40 stuff is rated at ~220 or so.
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Unread postAuthor: WOW!! » Fri Apr 20, 2007 5:04 am

AmYisroelChai wrote:Thankx...Ok thats what I thought. But 4"?! isnt that a pain to seal tight enough to stay pressurized. Do you have plumbers wrenches that big? OR just allot of teflon tape would work too.

But just one last question? I have a length of 4" PVC (my brothers a plumber I get scraps) I dont have it in front of me now but i am sure it was rated for 150PSI or around there. Is 4" not safe to 125PSI? I noticed you stopped at 50 PSI. Why?


As long as it has a pressure rating on the side and it does not say cell core you are fine. And the reason I stay around 50psi becuase the fittings are DWV.
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