PVC question

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Postby Relax.SA » Fri Dec 08, 2006 4:57 pm

Hey guys

I'm from South Africa, and our PVC is made a little differently. The person at the hardware shop could not tell me whether their PVC was cellular core or not. And our PVC does not have a schedule rating, or the normal pressure rating. What I have bought is PVC pipe with a pressure rating rating of 9bar (130PSI).

Will this PVC be strong enough? The PVC for use in the chamber is 9bar (130PSI) and the PVC for the barrel is 6bar(87PSI).

Any help will be appreciated.

Thanks
Eric
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Postby Drew Rowland » Fri Dec 08, 2006 5:00 pm

I think that will work fine. THe peak pressure found in a combustion is somewhere around 40 psi.
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Postby FLONE » Fri Dec 08, 2006 5:10 pm

Sounds a bit strange that the barrel is rated for less pressure than the chamber.
Anyway, read the forums about proper gluing procedures. Take your time, think thrice, measure twice and cut once. Be safe.
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Postby sgort87 » Fri Dec 08, 2006 5:16 pm

I like that... "think thrice".

I think I decided that I like you now, Flone. I've been a tad pestered by your sudden appearance and barrage of posts but you seem to be straightening out.
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Postby Relax.SA » Fri Dec 08, 2006 5:19 pm

Well I couldn't find such a high pressure rating PVC for the barrel, as it is only 40mm whereas the chamber is 110mm. Also, I will have to use multiple reducers, ie 110mm>90mm, then 90mm>50mm, then 50mm>40mm. Is this safe to do?
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Postby FLONE » Fri Dec 08, 2006 5:46 pm

Thank you Sparky, I will be asking about the internal shape of combustion chambers relative to projectile speeds.
Yup, multiple adaptors work. Blending the joints from the inside might only help the looks, nice thought though. Glue each one separately if possible. Helps control the quality of the joints and the overall appearance. NO sharp edges inside the combustion chamber. Very tacky!
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Postby Relax.SA » Fri Dec 08, 2006 6:04 pm

Thanks Flone. One more question. I have a PVC slip-to-threaded adapter for the plug side of the combustion chamber, but the local store only had galvanized(steel) end plugs. Will this be OK to use?
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Postby TurboSuper » Fri Dec 08, 2006 8:29 pm

Yup. Galvanized steel threaded fittings and PVC threaded fittings are perfectly interchangeable.
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Postby c0mpl3x » Fri Dec 08, 2006 9:11 pm

just use the 110 to 90, and 90 to 50, and run a 50mm barrel. also, cellcore pvc will have a whitish outer/inner face, and a yellow tint to the cellcore in the middle of this.
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Postby Relax.SA » Sat Dec 09, 2006 5:16 am

Ok then it seems as though I am set to start building. The PVC I have here is blue. Are you guys 100% sure this PVC is strong enough?
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