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safe working pressure?????????

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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safe working pressure?????????

Unread postAuthor: FORE!!!! » Fri Jul 10, 2009 10:31 am

just a quick question, ive recently built a pnumatic gun with 50mm pressure pipe (basic pipe) and sealed it with the green pressure glue ,im wondering on what pressure i can run it at safley ??????

ive shot it at 80psi and it works a treat ,im also wondering on weather the 1/4" nipple (general compressed air fitting) will blow out the end cap where it has been mounted ,i didnt tap a thread in i just drilled the hole heated the end of the nipple up and forced my own thred in the end cap,i used a couple of turn's of teflon tape and some gas sealing glue(loxeal)

do u think im safe??? its held at 80psi how much more should i go????
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Unread postAuthor: inonickname » Fri Jul 10, 2009 10:36 am

What's the rating of the pipe? Halve that and you will get an acceptable safety margin, assuming your glue joints are primed well and secured.
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Unread postAuthor: FORE!!!! » Fri Jul 10, 2009 10:55 am

no primer just pressure glue ,,do u think it needed primer i used brand new fittings and glue (do u know what pressure glue is??) not that blue pipe cement crap they use on house drainage and stack systems,,,,to be honest i dont even know what pressure glue is ,all i can say is that when i go to work and install pressure pipe we use green glue and no primer...

and how do i find the rating of my pipe,,any ideas????
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Unread postAuthor: jimmy101 » Fri Jul 10, 2009 12:00 pm

FORE!!!! wrote:and how do i find the rating of my pipe,,any ideas????

What does the pipe say on it? And, where are you located? Usually pressure rated pipe will have the pressure rating printed on it. :shock:
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Unread postAuthor: jmadden91 » Fri Jul 10, 2009 10:44 pm

If your using the green stuff your from Aus right? Then printed on the side of the pipe there will be PNxx. The x's being the pipe's pressure rating in bar. eg. PN12 = 174psi. Obviously dont go as high as its rating
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Unread postAuthor: inonickname » Fri Jul 10, 2009 11:22 pm

It can also be class, and then a number. The number is the rating in the bar. I mainly use class 18 fittings.

By the way, 1 bar =around 14.7 lb/in^2
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Unread postAuthor: FORE!!!! » Sat Jul 11, 2009 1:42 am

well the fittings are class 18 as per the sticker,,,the only thing written on it is+HOLEMAN dn50mm pn9 as/nzs1477 2008/12/21

maybe u can translate what the (pn9) is??? or by the standards on the pipe
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Unread postAuthor: inonickname » Sat Jul 11, 2009 7:07 am

rated for 9 bar, around 140 psi

100 psi is a fine working margin
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Unread postAuthor: FORE!!!! » Sat Jul 11, 2009 7:38 am

coool all is well then it seem's ,,,cheers "INONICKNAME" and thax for ur help... here she is

http://www.spudfiles.com/forums/viewtopic,p,251482.html
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