Pipe Problems

Just starting to spud and wonder how long your barrel should be? Want to know how to build a better cannon? This is just the place! If you think your question is one of a newcomer, please post it in here. If your question is posted elsewhere, and it's a newcomer's type question, it will be moved in here.

Postby ShowNoMercy » Mon Dec 18, 2006 9:31 pm

Hey I have a pretty big air cannon, its an over/under design with a Supah valve and just before the valve, the reducing setup i have has broken twice now. I was wondering what could be done to prevent this breakage?
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Postby MisterSteve124 » Mon Dec 18, 2006 9:53 pm

did you use pressure rated fittings?
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Postby ShowNoMercy » Mon Dec 18, 2006 9:56 pm

yea everything was up to par and glued correctly over a 24 hr period
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Postby BewareOfDog » Mon Dec 18, 2006 10:22 pm

Just before the valve... "where"? (Between the valve and chamber, or between the valve and barrel)

... Does it have a spacer in between the barrel and chamber?
...What are you launching?

...Why would I even care? :evil:
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Postby ShowNoMercy » Mon Dec 18, 2006 10:27 pm

its between the tank and the valve, it goes from a 4 inch tank to a bushing down to a 2 inch female coupling that connects to a nipple and then to the valve, the bushing has failed twice now. i was launching a small load of paintbals at the time and i suppose you would care cuase being a moderator adn all you need to add your expertise to those of us less fortunate
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Postby randomvictim » Mon Dec 18, 2006 10:30 pm

Some bushings are have a gradual reduction and others are solid and immediate. If you used a gradual reduction one I would imagine that the stress on the bushing would be greatly reduced.
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Postby ShowNoMercy » Mon Dec 18, 2006 10:31 pm

yea i have the direct reduction kind, so a more gradual one might work better? i was hesitant to use them cause they take up a lot of space and look pretty bad but if they wrk then ill have to deal
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Postby randomvictim » Mon Dec 18, 2006 10:37 pm

I'm not guaranteeing anything, I just thought that if it puts less stress on the bushing then there is less chance of it breaking. If the problem persists then you should probably not be using that much pressure.
<img src="http://www.subtleenergies.com/ORMUS/tw/traps/tt05.jpg"></img> The one on the left gradually reduces, where as the one on the right is immediate.
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Postby ShowNoMercy » Mon Dec 18, 2006 10:51 pm

umm there the same thing, one is facing up adn the other down but i know what your talking about, and about pressure im only running round 70 ish
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Postby An Apple Pie » Tue Dec 19, 2006 7:09 pm

Are you using Primer? When gluing make sure the primer is WET when you apply the glue.

I do not think the style of brushing really maters. I think a curved one puts less pressure on it, although pressure rated is pressure rated so they should both hold up fine. I have a 4"-1.5" brushing(without the curved inside) on my chamber. I fill it to 115PSI and it hasn't failed(and hopefully never will:?).
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