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compression fittings /pressure rating

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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compression fittings /pressure rating

Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 6:03 am

Ive recently completed a barrel sealing piston valve and am wondering on the pressure rating for a kinco nut and olive(nylon),which holds my barrel in place
its 3/4 copper extended into a 1'' tee ,and before i take the pressure right up i am wondering on what it will hold before blowing ?
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Unread postAuthor: jmadden91 » Mon Aug 17, 2009 6:04 am

A lot mate. In excess of 500psi I believe
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 6:12 am

dam thats alot of pressure....

cheers 8)
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Unread postAuthor: jmadden91 » Mon Aug 17, 2009 6:17 am

No worries mate. But don't hold me to that though :? Talking out of my arse a bit. But Mitch uses them in his guns and takes them to 500

eg
http://www.spudfiles.com/forums/just-another-500psi-bb-gun-t15152.html

another one
http://www.spudfiles.com/forums/500psiand-piston-valve-launcher-and-6mm-steel-coaxial-t14137.html
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 6:27 am

thats cool considering my fire extinguisher is pressure rated to 285psi ,meaning thats as high as i will go, i think i should be safe :idea:
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Unread postAuthor: inonickname » Mon Aug 17, 2009 7:01 am

They'll hold to whatever pressure you can put in them.

They'll hold until:
A) Whatever means the pipe is held to the olive by fails
B) The threads shear
C) The material behind the olive fails.

In other words, bloody high.
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Unread postAuthor: CpTn_lAw » Mon Aug 17, 2009 9:22 am

I have a question that is not related to this topic, but doesn't require the creation of a new one : is a shock-pump shrader compatible?
I'm tired of my bicycle pump topped at 200 psi , i want to double that.
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Unread postAuthor: FORE!!!! » Mon Aug 17, 2009 9:48 am

id say yes , i found this on ebay it ses it has a attachment
for a car valve av

is that a shrader?
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Unread postAuthor: GalFisk » Wed Aug 19, 2009 3:25 am

I don't trust compression fittings, I know of at least two incidents where such a fitting has slipped with ...energetic disassembly as a result. To improve safety, you could fasten the olive on the barrel, brace the barrel so it won't slip, or use sand paper to put radial grooves around the pipe under the olive, to improve friction. Just being observant to any beginning slippage also helps.
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Unread postAuthor: inonickname » Wed Aug 19, 2009 3:50 am

GalFisk, I usually secure the olive by some means..

Seen as suspension shocks use schrader valves, you'd assume that shock pumps use an appropriate thread?

(yes)
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