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Fire extinguisher tank

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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Fire extinguisher tank

Unread postAuthor: Gun Freak » Sun Jul 18, 2010 5:56 pm

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There is a teeny tiny leak here, but I think it will fix itself. I can see a little bit of black, which I assume is the STEEL JB Weld part just getting pushed out. So I'm just gonna wait another day or so then give it another go. If it still leaks, I will just cover it with some more JB Weld.
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That's it. Just wanted to share... It has a bunch of air capacity so I can get a long fire duration out of it. So far I have only gone up to 80 psi but I plan to get up to somewhere around 140. Cheers :)
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Unread postAuthor: clemsonguy1125 » Sun Jul 18, 2010 5:59 pm

Looks good, where do you get the threaded schrader, auto zone doesnt care them, itll look better with a black paint job, the red messes up the realalistic look
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 6:03 pm

clemsonguy1125 wrote:Looks good, where do you get the threaded schrader, auto zone doesnt care them, itll look better with a black paint job, the red messes up the realalistic look

Thanks, I get all my schraders from Ace, they have threaded 1/8th inch and 1/4. I like to get 1/4" because they are brass and it saves another bushing. I like the red though, haha, it looks funny. I'm giving it a camo paint job like the ones hunters have on their vests and stuff like that anyway for better hiding in airsoft skirmishes.
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Unread postAuthor: clemsonguy1125 » Sun Jul 18, 2010 6:06 pm

Yeah im gonna check at owes for the threaded schraders then
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 6:15 pm

Anyway, do you have any suggestions for sealing the leak if it doesn't seal itself, I mean like other than using more JB Weld...?
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Unread postAuthor: clemsonguy1125 » Sun Jul 18, 2010 6:16 pm

Um Ive had decent luck with epoxy, you know what JSR would say to that, Ive heard sucking in JB weld with a vacum cleaner works well
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 6:23 pm

clemsonguy1125 wrote:Um Ive had decent luck with epoxy, you know what JSR would say to that, Ive heard sucking in JB weld with a vacum cleaner works well

Well JB Weld is epoxy... I don't want to bother with any of that crap. The stuff I use is junk and never works. I think I'll just use more JB Weld.
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Unread postAuthor: MrCrowley » Sun Jul 18, 2010 7:38 pm

How big is the gap between the nipple and the fire extinguisher tank? If there is too much wiggle room, the jb-weld could crack and the tank fly off. In my experience, JB-Weld isn't very good at supporting stress loads. So if the tank is unsupported or gets knocked around, I could see the jb-weld coming off. Except on jb-welds that are months old, it is pretty easy to crack and remove.
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Unread postAuthor: Lockednloaded » Sun Jul 18, 2010 7:39 pm

I'd cast the whole thing at the fittings if you have enough epoxy. I built one of these too, I'd add a reg if I were you
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 7:51 pm

Lockednloaded wrote:I'd cast the whole thing at the fittings if you have enough epoxy. I built one of these too, I'd add a reg if I were you

Yeah I think that as soon as I fix my spare reg I'll put it on.

How big is the gap between the nipple and the fire extinguisher tank? If there is too much wiggle room, the jb-weld could crack and the tank fly off. In my experience, JB-Weld isn't very good at supporting stress loads. So if the tank is unsupported or gets knocked around, I could see the jb-weld coming off. Except on jb-welds that are months old, it is pretty easy to crack and remove.

There is so space. I used the fitting that was on the handle that threaded into the tank's neck. I just sawed it all apart and got the fitting part out, grinded it down to just the threads, then tapped 1/4"npt threads on the inside for a 1/4" close nipple from the tee to go into. I think a little bit more weld will do the trick. There isn't much stress on the JB itself, since all the fittings and nipples thread into each other perfectly.
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Unread postAuthor: blind909 » Sun Jul 18, 2010 8:01 pm

I like it, good use of household materials :D . Lemme guess, your going to use it to power your bbmg?
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Unread postAuthor: deathbyDWV » Sun Jul 18, 2010 8:02 pm

Looks good. For the leak, I've had luck with sanding/filing and then running some superglue over the leak. Let that dry good and then put epoxy over it. Make sure you let the epoxy dry for at least 24 hours...

I'm not sure why how the superglue helps but it really does. I guess it might fill in the tiny holes better than epoxy since it's not as thick...
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 8:04 pm

Ok thanks for the tip. I have a bit of epoxy left over, so after I cover it in more JB I might run that over it too. The leak is very tiny but it will be holding air for long periods of time so I want to fix it.
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Unread postAuthor: SpudBlaster15 » Sun Jul 18, 2010 8:11 pm

I'd just file the JB weld seal down to slightly below the desired thickness, then add another layer to seal the leak and smooth the finish.

As far as the structural integrity of the connection, it should be more than sufficient, provides you mixed and applied the epoxy effectively.
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Unread postAuthor: Gun Freak » Sun Jul 18, 2010 8:13 pm

SB15 that's probably what I'll end up doing. I'll do it tomorrow and give it like 3 days cure time.
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