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fire extinguisher leaking

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 leaking

Unread postAuthor: hi » Sun Mar 25, 2007 11:37 pm

My dad was nice enough to let me have our old FE. I emptied it out and took the top off and noticed that it had 3/4 inch threads on it. I just happened to have a 3/4 nipple and a ball valve, pressure gauge and a threaded schrader valve and a few other fitting, screwed them together and quickly had an air chamber. Everything worked great until it started leaking (which was instantly
) It leaks where the FE and nipple meet. I have tried everything I can think of. I have gone around it about 10 times, literally 10 times, with Teflon tape and tightened it with a pipe wrench as tight as i can and it still leaks!!!! any other suggestions?
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Unread postAuthor: A-98 » Sun Mar 25, 2007 11:48 pm

well, if you want to get it off...i dont know. but if your never going to remove it, use JB weld. its never leaked on me.

they also have teflon paste, which might work.
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Unread postAuthor: noname » Sun Mar 25, 2007 11:51 pm

Dump a bunch of silicone sealant on the male threads and then screw it in. Wait for the whole cure time, then test it. It should be perfect. If it does leak (highly unlikely), you can always wrench it off with a vice and pliers.
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Unread postAuthor: allthingsgo2 » Sun Mar 25, 2007 11:51 pm

Take it to a welding shop and have them put a nipple on it for you.
Im not sure i trust the jb weld
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Unread postAuthor: MrCrowley » Sun Mar 25, 2007 11:51 pm

JB Weld = Best thing since sliced bread.

3/4" threads thats interesting....mine had weird threads about 5/8" threads....I had to get <A HREF="http://www.spudfiles.com/forums/viewtopic.php?p=56422&#56422">Mine</a> welded.
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Unread postAuthor: A-98 » Sun Mar 25, 2007 11:53 pm

well, if its already threaded with 3/4 then teh jb weld will do nothing but strengthen the bond.

JB weld = sliced bread+canned meat
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Unread postAuthor: hi » Mon Mar 26, 2007 12:14 am

If i use the jb weld, do i do it with or without the Teflon tape? I have jb weld and ill try it, but would still like other suggestions before i glue it.
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Unread postAuthor: A-98 » Mon Mar 26, 2007 12:22 am

i find that it doesnt work as well with teflon tape.
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Unread postAuthor: MrCrowley » Mon Mar 26, 2007 12:25 am

Use teflon and once its screwed into the FE put JB over the gap between the fitting and the FE...
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Unread postAuthor: rna_duelers » Mon Mar 26, 2007 12:55 am

Use about 20 wraps of teflon tape,and a little grease.Seems to work for me.
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Unread postAuthor: Matheusilla » Mon Mar 26, 2007 10:28 am

The threads in a fire extinguisher have a larger pitch than pipe threads. Use the jb weld (or "steel" epoxy).
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Unread postAuthor: iknowmy3tables » Mon Mar 26, 2007 11:27 am

yeah one of the problems is probebly that the threads aren't really 3/4" sort of like how garden isn't 3/4"npt but you can actully use npt with garden hose if you just use lots of teflon or sealent
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Unread postAuthor: spudthug » Tue Mar 27, 2007 2:09 pm

ok well first of all u most likely ruined ur fire extinguisher by putting that 3/4 in...it is most definately not 3/4 the 3/4 may fit but trust me it isnt 3/4....second fes are machine threaded and will leak no matter what...pipe thread is 14 threads per inch the fe machine thread is about 22...u do the math the only way to get it stop leaking is to weld/silver solder it...i silver soldered mine because it isnt made for fittings....
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Unread postAuthor: lukemc » Tue Mar 27, 2007 2:38 pm

is silver solder the same as soldering copper pipe?
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Unread postAuthor: Fnord » Tue Mar 27, 2007 3:22 pm

I had the same problem with some black iron pipe I bought for making a hybrid over the summer. I did some pressure testing and it would leak no matter how much teflon tape I put on it. Then it was like 10:00 at night, and I just though what the hell, and used electrical tape instead of teflon. It never leaked again, even when I pressurized it passed 160 psi.
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