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clear schedule 80 pvc safe for hybrids?

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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clear schedule 80 pvc safe for hybrids?

Unread postAuthor: dan116 » Tue Jun 20, 2006 5:35 pm

just wondering, I want to make a mini hybrid using 2" schedule 80 clear pvc, it has a max psi rating of 200psi. Is it safe enough for a 2x mix maybe even a 3x?
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Unread postAuthor: benstern » Tue Jun 20, 2006 6:51 pm

NO that is far too dangerous.
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Unread postAuthor: Pete Zaria » Tue Jun 20, 2006 7:11 pm

Look into Lexan. Clear PVC is a bad idea. It could probably take a 2x mix (from what I've read here, I'm no expert) but it's a bad idea, eventually it would break, and PVC shrapnel at 200 mph isn't very fun.

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Unread postAuthor: carlbelcher » Tue Jun 20, 2006 7:25 pm

Polycarbonate or "Lexan" isn’t used for pressure applications to my knowledge.
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Unread postAuthor: SpudStuff » Tue Jun 20, 2006 7:41 pm

the 2 inch clear sch 80 is rated to 320 psi. this also has a huge saftey margin it is the same pressure as 4" sch 80. Also the pipe is not rated for the heat which will decreace the alredy low raating.

just dont do it.
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Unread postAuthor: dan116 » Tue Jun 20, 2006 8:12 pm

im not sure where you got the 320psi, but on McMaster 2" schedule 80 clear pvc pipe has a rating of 200psi :?
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Re: clear schedule 80 pvc safe for hybrids?

Unread postAuthor: frogy » Thu Jun 22, 2006 2:19 pm

dan116 wrote:just wondering, I want to make a mini hybrid using 2" schedule 80 clear pvc, it has a max psi rating of 200psi. Is it safe enough for a 2x mix maybe even a 3x?


Regular 2" Sch 80 = 400 Water Psi max
Regular 2" Sch 40 = 280 Water Psi max

You're asking to use 200 psi pipe which is even less than what 2" Sch 40 can withstand....

This won't even be safe with a 1x mix really... which is just propane right?

Just don't do it, you'll give all Spuders a bad name if\when you hurt yourself.
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Re: clear schedule 80 pvc safe for hybrids?

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Unread postAuthor: beebs111 » Thu Jun 22, 2006 3:43 pm

hey, i got a good idea......make the gun, then remote fire it from 50 feet back!!!!! just stick with a 2x mix, and youll be good :D
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Unread postAuthor: dan116 » Thu Jun 22, 2006 4:44 pm

[froggy]You're asking to use 200 psi pipe which is even less than what 2\" Sch 40 can withstand....

This won't even be safe with a 1x mix really... which is just propane right?

Just don't do it, you'll give all Spuders a bad name if\when you hurt yourself.


I've seen people on spudfiles that use schedule 40 pvc at a 1x mix, which at 4\" as a rating of about 150psi[/quote]
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Unread postAuthor: Shrimphead » Thu Jun 22, 2006 7:35 pm

Just use it for a normal gun, or maybe a 1.5X mix.
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Unread postAuthor: boilingleadbath » Thu Jun 22, 2006 9:55 pm

*mutters*
I'm starting to think the sch system is inferior to the sdr system, if only because people have silly misconceptions with the sch system...

4\" sch 80 is rated to 320 psi. People have used 4x mixes, generating an estimated 245 (measured at 270) psi, in it without much trouble other than the odd exploding union, which doesn't count anyways.
2\" clear sch 80 is rated to 200 psi.
Using the same pressure:rating ratio, it should be safe for 170psi, or nearly a estimated 3x mix. Obviously, my estimates are slightly off, so play it safe and only use a 2.5x mix.

Sure, these guys may question your sanity, but it's probably quite safe.
Just remember to use a multi-point ignition system to help prevent the flamefront from transitioning to detonation, as it does that more redily in small diameter tubes.
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Unread postAuthor: Mini Khan » Thu Jun 22, 2006 11:32 pm

I would use steel it will probaby be the same price as clear pvc
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Unread postAuthor: beebs111 » Fri Jun 23, 2006 9:01 am

no, 2" steel is really expensive,$5.50 a foot at my local hardware store :roll:
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Unread postAuthor: dan116 » Fri Jun 23, 2006 10:16 am

I have a big supply of 2" and 3" metal sprinkler pipe rated for 1000 psi, but i wanted to make a clear hybrid, but a full size metal hybrid is a future plan.
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Unread postAuthor: Mihlrad » Fri Jun 23, 2006 11:32 am

beebs111 wrote:hey, i got a good idea......make the gun, then remote fire it from 50 feet back!!!!! just stick with a 2x mix, and youll be good :D


50 feet? He will still has a chance to get badly injured at that range... if the pvc has enough force behind it to shatter like a grenade, i dont think 50 feet is saving you from getting shreded by shrapnel.
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