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?i ... =blast_box
PVC Failures
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jrrdw
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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.
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.
That's a lot of pressure. When I first began spudding I didn't believe that PVC was that tough.-
Gun Freak
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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.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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.hunterT wrote:WHOA That's a lot of pressure. When I first began spudding I didn't believe that PVC was that tough.jrrdw wrote: Filled with water the PVC pipe held to 1029PSI then split the side open in the middle.
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Gun Freak
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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.
OG Anti-Hybrid
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
One man's trash is a true Spudder's treasure!
Golf Ball Cannon "Superna" ■ M16 BBMG ■ Pengun ■ Hammer Valve Airsoft Sniper ■ High Pressure .22 Coax
Holy Shat!
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metalmeltr
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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.
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.Gun Freak wrote:The pipe is rated with a high safety factor.
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
also you MUST weld the joints correctly and wait for it to cure fully