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Unrated fitting question

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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Unrated fitting question

Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 2:46 pm

Does the (red) fitting need to be pressure rated? It comes after the sprinkler valve and isn't connected to the air chamber. However, I'm assuming that it will still have to withstand quite a lot of pressure when all the air escapes. (It is a 1" valve connected to either a 3, 2, or 1" barrel.) The reason I ask this question is I stupidly forgot to order these parts, and I don't want to wait another 2 weeks by ordering them off of sprinkler.com. My local hardware store provides 3 x 1" bushings, which is the part I need, but they are dvw. Anyone know? Thanks,

pyr0
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Please!.JPG
Arrow = direction of air travel. Red part = the part in question.
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Unread postAuthor: ShowNoMercy » Tue Oct 23, 2007 2:48 pm

Unless you have a really perfect seal in between your barrel and ammo, I would say go ahead and use it. However if you make your projectile too heavy or to tight all bets off.
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Unread postAuthor: ALIHISGREAT » Tue Oct 23, 2007 2:54 pm

well it also depends what pressure you are going to use, i agree with ShowNoMercy though, you shouldn't use tight fitting heavy projectiles and it should be safe. i assume that as you are using a sprinkler you will use 100-150psi any more and i wouldn't trust the fitting.
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Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 3:01 pm

The projectiles I am going to use are: C batteries in the 1" chamber, soda bottles in the 3", and potatoes in the 2" barrel. I don't know how tight a fit the c batteries and the soda bottles are.
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Unread postAuthor: MrCrowley » Tue Oct 23, 2007 3:06 pm

If anything it will just fly off, which could be dangerous. Just buy the parts of mcmaster.com they come a lot quicker.
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Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 3:09 pm

ok thank you.

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Unread postAuthor: DYI » Tue Oct 23, 2007 3:09 pm

I have used non-pressure rated ABS pipe and fittings for barrels on all of my launchers, and have used nearly 500 psi in some of them with no failures of any kind. PVC isn't as shock resistant though, so it may not work as well. The heavier the ammo, the slower the acceleration, and higher and longer the pressure spike.
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Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 3:16 pm

Is what I want a socket weld x pipe? (One end needs to have the 1" pipe slip into it, the other needs the 3" pipe to slid over it)
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Unread postAuthor: MisterSteve124 » Tue Oct 23, 2007 3:45 pm

Are you trying to get a female adapter (with the threads) or just the reducer/bushing part? If you just want the reducer/bushing part then you'll need a 3" coupling and a 3" x 1" bushing that is socket weld on both ends.
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Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 3:52 pm

This is what I need:
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Sch 40 Reducing Bushing (SxS).JPG
The black arrow = where the 1&quot; pipe needs to slip into. The red arrows = what the 3&quot; pipe needs to slip over.
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Unread postAuthor: ALIHISGREAT » Tue Oct 23, 2007 3:57 pm

if you have a pressure rated pipe on the inside and pressure rated ont he outside i see no problem with using it.
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Unread postAuthor: Pyr0man1ac » Tue Oct 23, 2007 4:29 pm

Really? That's great... yeah, both pipes are pressure rated to well over 250 psi. I guess I'll just go downtown and buy the parts tomorrow! Thanks a lot!

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Unread postAuthor: LikimysCrotchus5 » Tue Oct 23, 2007 6:06 pm

Yea your barrel does not necesarily have to be pressure rated because i do have a ABS barrel on one of my cannon ( my first cannon to be correct) and it shoots fine. :D
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Unread postAuthor: spudgunnerwryyyyy » Tue Oct 23, 2007 6:13 pm

First off the barrel recieves a pressure spike for only a few miliseconds, so like likmycrotch said abs works great because it is very flexible, so abs is fine, dwv pvc isn't cell core its just very thin, i see no problem in using that part as long as you don't shoot any thing that might get stuck in the barrel.
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Unread postAuthor: noname » Tue Oct 23, 2007 7:40 pm

spudgunnerwryyyyy wrote: dwv pvc isn't cell core its just very thin,


Not true in the least. I've seen 8" DWV fittings that are over 1/2" thick. The main reason we don't use DWV is because it isn't made the same way, and the socket depths are much shorter than potable water fittings.
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