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leaking chamber

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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leaking chamber

Unread postAuthor: jr » Sun Feb 10, 2008 3:26 pm

So we all make mistakes; right! This time i didn't get a complete weld or the fitting was bad!!!! :(

3" end cap, 3" coupler, 3x2 reducer, 2x1 reducer, 1" orbitz sprinkler (w/mod. blow gun) 1.5" sdr21 barrel.........

So now that the chamber is done and it leaks between the coupler and reducer how can this be sealed? :? It is a slow(1-5psi per sec.) leak.

epoxy? could it blow off in chunks!!

tire slime? will it seal, the extra can be washed out so it wont gum up the valve


any other ideas :idea:
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Unread postAuthor: bigbob12345 » Sun Feb 10, 2008 3:29 pm

JB weld should work just smear it all over the place were its leaking it wont look nice but it will fix the leak.
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Unread postAuthor: bluerussetboy » Sun Feb 10, 2008 3:39 pm

reducers or reducing bushings?

i only ask because not all reducers are pressure rated.

if non-pressure rated reducers scrap them and redo your joint properly with pressure rated bushings.

if they are pressure rated, epoxy will work fine to seal the leak. it is not quite as messy as JB Weld.
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Last edited by bluerussetboy on Sun Feb 10, 2008 3:40 pm, edited 1 time in total.

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Unread postAuthor: jrrdw » Sun Feb 10, 2008 3:39 pm

Tire slime will more then likely blow out above 50 psi. Mind you I never tested this, but it is designed for car tire pressures. Just trying to save you 9 bucks, that stuff is costly! Works really good on tires though. I have used it there.
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Unread postAuthor: Ragnarok » Sun Feb 10, 2008 3:51 pm

The best solution I can think of is if you have access to a vacuum pump, then create a moderately strong vacuum in the chamber, suck primer through the leak, then suck cement through, relieve the vacuum, then let it set for 24 hours.

However, you might not be that lucky to have such a pump, in which case, superglue isn't a bad leak plugging method because it's designed to penetrate cracks (No stupid jokes!!!) and in a narrow gap it will harden very well.

You can then smear epoxy over the top if you want, but the superglue should hold the leak if used well. Just don't use it for entire joints, it's not any good for that, but it will plug a leak.
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Unread postAuthor: jr » Tue Feb 19, 2008 11:13 pm

The super glue worked like a charm!!

Thanks Ragnarok
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Unread postAuthor: dinsdale » Wed Feb 20, 2008 4:24 pm

i like permatex cold weld compund, it is like jb weld but gets gummy quickly so you can shape it and smooth it so it doesnt look messy, i've fixed a few leaks with it, i like it better than jb
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