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Laminating Small diameter inside larger diamater PVC

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Laminating Small diameter inside larger diamater PVC

Unread postAuthor: JudgieSA » Tue Apr 17, 2007 4:38 am

For the reservoir chamber on the gun I intend to build IF the S.A. gun laws allow it, i was thinking of laminating some 90 PSI PVC inside some of the same rating (i can get two diameters that will fit each other like a glove) and then wrapping the whole lot with several layers of fibreglass reinforced tape. Whats the opinion on this?
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Unread postAuthor: experament-u2 » Tue Apr 17, 2007 4:40 am

y not just save some time and sleeve some pn18 pipe in another piece then wrap it in fiberglass it would be able to hold allot more pressure
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Unread postAuthor: JudgieSA » Tue Apr 17, 2007 4:57 am

experament-u2 wrote:y not just save some time and sleeve some pn18 pipe in another piece then wrap it in fiberglass it would be able to hold allot more pressure


Because what I specified in my original post is the best that I can get at this time :( . The results that were calculated using the spudtech spreadsheet were optimal for what I need and that was at 100 PSI. The reason i chose fibreglass reinforced tape is that it will dramatically slow down if not stop PVC fragments, while duct tape as we all know is frickin useless :evil: i hate it.
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Unread postAuthor: Mr.Russ » Tue Apr 17, 2007 5:30 am

what are the sizes of pvc?
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Unread postAuthor: JudgieSA » Tue Apr 17, 2007 5:52 am

Seems i'm stuffed anyway, just went out and checked what i was going to use for the chamber. It's DN100 SN6 as layed out in AS/NZS 1260 (Australian / New Zealand standards). I.e. not pressure pipe, but according to this document http://www.vinidex.com.au/vinidex/live/ ... Cpipes.pdf
it has a stiffness of 6000 N/m/m whatever that means?!

About all i could do is use it as an outer sleeve for some PN18, again with fibreglass tape around the whole lot.

Upside is i didn't have to pay for it. Got it in brand new condition (stored in shed) from a mate who had no use for it anymore.
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Unread postAuthor: boilingleadbath » Tue Apr 17, 2007 3:52 pm

6000 N/m/m means that if you got a 1 meter long section of pipe, and clamped one end in a vice, the other end would deflect 1 meter if you if you put 600 kg on it.

Now, I expect a 1 meter section would actually snap before it deflected one meter, so let's just say that it'd "take 60 kilograms to make the pipe segment deflect 10 cm".

Assuming that my memory is correct and that I've done my math right.
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Unread postAuthor: JudgieSA » Tue Apr 17, 2007 4:31 pm

boilingleadbath wrote:6000 N/m/m means that if you got a 1 meter long section of pipe, and clamped one end in a vice, the other end would deflect 1 meter if you if you put 600 kg on it.

Now, I expect a 1 meter section would actually snap before it deflected one meter, so let's just say that it'd "take 60 kilograms to make the pipe segment deflect 10 cm".

Assuming that my memory is correct and that I've done my math right.


Cheers for that :). But despite that it's still unsuitable for a pneumatic potato gun, right?
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