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PVC Failures

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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PVC Failures

Unread postAuthor: HunterT » Sun Oct 17, 2010 1:09 am

I found this article and it really demonstrates the how PVC fails. A must for any spud cannon maker.

http://www.crazybuilders.com/item.php?id=000010&type=project_section&title=blast_box
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Unread postAuthor: jrrdw » Sun Oct 17, 2010 5:42 am

That's pretty cool and all, but I don't for see any spudder doing this while out shooting their cannon. Nice scatter of shrapnel...

There has been a few PVC test posted here, and by far my favorite is the static pressure test with a 2" X 10' piece of SCH40 pressure rated pipe. Filled with water the PVC pipe held to 1029PSI then split the side open in the middle.
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Unread postAuthor: HunterT » Sun Oct 17, 2010 3:30 pm

jrrdw wrote: Filled with water the PVC pipe held to 1029PSI then split the side open in the middle.


WHOA :shock: That's a lot of pressure. When I first began spudding I didn't believe that PVC was that tough.
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Unread postAuthor: Gun Freak » Sun Oct 17, 2010 3:33 pm

Many people underestimate it's strength. While I am cautious when using PVC, I still know that when properly put together and handled, it is perfectly safe for a spudder's application.
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Unread postAuthor: saefroch » Sun Oct 17, 2010 5:02 pm

hunterT wrote:
jrrdw wrote:Filled with water the PVC pipe held to 1029PSI then split the side open in the middle.


WHOA That's a lot of pressure. When I first began spudding I didn't believe that PVC was that tough.


Yeah, PVC can hold a considerable amount of pressure, I have some 2" that's rated to 240psi. It's because of the failure mode that people avoid pushing it.
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Unread postAuthor: Gun Freak » Sun Oct 17, 2010 5:44 pm

The pipe is rated with a high safety factor. My 2" is rated to 280 psi. As the diameter goes up, the pressure rating goes down. I believe my 1/2" is rated to 680, and I would trust it at like 300 psi. At these pressures though, failure decomes even more dangerous because the higher pressure can send the shrapnel even faster.
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Unread postAuthor: metalmeltr » Sun Oct 17, 2010 7:22 pm

I had a PWC DWV cleanout blow out the back of my advanced combustion the other day, deystroyed the fan, what i found of the cap was shattered.
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Unread postAuthor: c11man » Sun Oct 17, 2010 8:55 pm

Gun Freak wrote:The pipe is rated with a high safety factor.


i dont know any acual numbers but to be legal to sell the pipe has to have a pretty good saftey factor. due to PVC's less than favorable failure properties i would assume that it is made with an even higher saftey factor than say a copper pipe.

remember that its not the pressure that causes most failures, its the recoil, piston impact, and barrel flex that put exessive forces on the pipe/fittings and causes the failure. build a launcher than can has the can handle these forces and you will have lots of fun with your pvc :D
also you MUST weld the joints correctly and wait for it to cure fully
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