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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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Unread postAuthor: SpudBlaster15 » Sun Jul 18, 2010 8:25 pm

Regular JB weld should only need ~15 hours to cure, so the 3 day wait is probably overkill. Maximum strength should be achieved overnight.
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 9:00 am

Alright, well I'm going to do it up with some more JB right now. Just gonna sand down the existing stuff then put more over it. That should hold fine.

edit, ok the new JB is curing, I covered all the old stuff with new stuff and new testing will be done tomorrow afternoon.
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Unread postAuthor: Crna Legija » Mon Jul 19, 2010 9:20 am

i just smeared epoxy over the the threads and screwed it into the FE. Let it cure for a day and a half, it held 350psi for 5 hr.

coat the inside with paint to stop it from rusting, myn did.
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 9:23 am

I was going to do the paint... but I didn't... oh well. I still can. I'll just unscrew the schrader then pour some paint in. What kind do you recomend using? Also what threads did you use to go in the FE?
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Unread postAuthor: Crna Legija » Mon Jul 19, 2010 9:33 am

i used paint called ''kill rust'', i used a 1/2inch bsp nipple
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 9:36 am

Oh, 1/2" was too small and a 3/4" nipple would barely go in, so I had to use the one that was on the nozzle and tap threads in it for the 1/4" close nipple in the tee. I'll se what paint I have. How much should I pour in?
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Unread postAuthor: spudtyrrant » Mon Jul 19, 2010 9:59 am

Gun Freak wrote: too small: nipple: would barely go in: How much should I pour in?
do i even have to say it :roll: :lol:
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 10:00 am

Yes :D
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Unread postAuthor: Technician1002 » Mon Jul 19, 2010 10:39 am

On painting the inside of a tank, you should use enough paint to coat the entire inside and then pour the excess out.

For paint to dry, it needs fresh air. Paint in a sealed tank won't dry. A small aquarium pump and hose to flow air through the tank for a couple of days should dry the paint. Dry the tank with the tank upside down so any excess paint can drip out. If excess paint collected in the tank, the puddle will skim over leaving a puddle of wet paint in the tank after the rest of the paint has dried.
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 11:03 am

So I'll unscrew the schrader and pour the paint in there. Will a 1/4" hole be enough to let in air? Or should I use a pump?
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Unread postAuthor: Technician1002 » Mon Jul 19, 2010 12:32 pm

Use a pump. There is little air exchange through a small hole so it would take forever to dry. Even purging a propane tank with a 1 inch hole requires using a pump. Here is a photo of a propane tank being purged with air prior to using an electric drill on it. I let it purge for most of a day before drilling. A vapor of only 4.2% is very explosive. Use the same procedure to dry paint. Vent until it no longer smells like wet paint.
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 12:37 pm

Alright thanks. How long would my tank last if I don't use paint?
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Unread postAuthor: Technician1002 » Mon Jul 19, 2010 12:43 pm

That depends a lot on your location, the tank, and what you consider end of life. High humidity, coastal salt, and such will shorten the life much more than living in Death Valley. Depending on the pressure used, do you quit using it when rust flakes plug the valve or do you wait until it leaks or blow up? Be safe. Unpainted in dry areas, probably at least 8 years. In wet, salty or other high rust areas, probably only a season or two.
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Unread postAuthor: Gun Freak » Mon Jul 19, 2010 1:42 pm

Dammit, I love on the Florida coast! Looks like I have to paint it... :roll:
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Unread postAuthor: SpudBlaster15 » Mon Jul 19, 2010 2:05 pm

With the painting, you don't need to use a pump to circulate the air, though it would definitely help. With a small vent hole, diffusion to the atmosphere will allow the solvent vapors to escape and the paint to eventually dry, but you're looking at a waiting period of at least a few days.
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