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one day at

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: tape fist » Sat Feb 14, 2009 5:01 am

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Unread postAuthor: Lentamentalisk » Sat Feb 14, 2009 5:13 am

Heres a link to all of the times people have used them:
http://www.spudfiles.com

They are used a bunch, especially by the French...

Who knows what pressure they can withstand, because they are not pressure rated.
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Unread postAuthor: tape fist » Sat Feb 14, 2009 5:17 am

ya I know i should of searched but really sarcasm dose not help when its 4 o'clock in the morning.
thanks though
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Unread postAuthor: CpTn_lAw » Sat Feb 14, 2009 5:43 am

these are thin walled aluminium water bottles. They are used mainly by alpinists, so if the bottle is filled with a bubbly soda like cola, and is closed at the bottom of the mountain, it should be sturdy enough to withstand the pressure it might has developped by the time you get to the top of the moutain. I'd say you can put 50-60 psi in it...i personally wouldn't bet my life on it.
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Unread postAuthor: tape fist » Sat Feb 14, 2009 5:48 am

ya your probably right,it just looked so convenient though. :)
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Unread postAuthor: inonickname » Sat Feb 14, 2009 5:48 am

Already been discussed today.....

Of course they come in different qualities, thickness etc.. If you want a real number hydro test them.
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Unread postAuthor: tape fist » Sat Feb 14, 2009 5:53 am

Already been discussed today.....

Of course they come in different qualities, thickness etc.. If you want a real number hydro test them.



I saw that thread earlier were sniper hero showed something that looked similar to this but when i searched for metal bidon i couldn't`t find any thing on it that`s what made me remember these.
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Unread postAuthor: psycix » Sat Feb 14, 2009 1:05 pm

I'd say you can put 50-60 psi in it..
I think they can hold more. They also need to withstand the pressure of carbonated soda drinks, so just like coke bottles, they should be able to handle more.
Though I have to agree that without testing burst pressures it is wise to stay under 60 psi.
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Unread postAuthor: MrCrowley » Sat Feb 14, 2009 3:31 pm

Buy two of them. Pick up some dry ice also. I can't say much without breaking the rules but one of the bottles will be expendable so you can find out how much pressure it can hold before it fails.
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Unread postAuthor: Lentamentalisk » Sat Feb 14, 2009 5:47 pm

well if you screw a pressure gauge in the mouth of one of them, and then film it with a video camera that is behind a barrier, using a mirror to view the bottle, then you could see what pressure it bursts at.
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Unread postAuthor: maggotman » Sat Feb 14, 2009 6:58 pm

how would you connect one dose it have pipe thread in the neck ?
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Unread postAuthor: MrCrowley » Sat Feb 14, 2009 7:00 pm

maggotman wrote:how would you connect one dose it have pipe thread in the neck ?

Probably better just to tap it into the bottom i'd imagine. The bottom of bottles are usually the thickest.

Edit: Just realised you're talking about attaching it to a valve, I thought you were talking about the post above with the pressure gauge. I guess if it was suitable to use and the threads weren't compatable you would have to epoxy it.
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Last edited by MrCrowley on Sat Feb 14, 2009 7:19 pm, edited 1 time in total.
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Unread postAuthor: Sticky_Tape » Sat Feb 14, 2009 7:11 pm

Maybe you could fiberglass it it would make it stronger. I was at
China-Mart about and hour ago and saw one of these and earlier I saw a topic on here about it. I inspected it and personally I wouldn't use it I could squeze it enough to make a dent and it has a weld or fold line?
I has an idea maybe you could buy one of those vaccum insulated thurmoses and drill a hole to relieve the vacuum and fill the space with epoxy to make a strong pressure vesel.
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You can tell how awesome a cannon is by the pressure used.
http://www.spudfiles.com/forums/high-pr ... 12803.html
xnt rnm ne z ahtbg
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Unread postAuthor: THUNDERLORD » Sat Feb 14, 2009 8:31 pm

well if you screw a pressure gauge in the mouth of one of them, and then film it with a video camera that is behind a barrier, using a mirror to view the bottle, then you could see what pressure it bursts at.


I recently had an idea for testing burst-discs.
I was thinking of connecting two Burst disc cart.s in parallel (small copper pipe) to both with (one filler for both),
Only one copper pipe would have a shraeder valve (tire valve stem) connected that the pressure will be flowing through.

You could check how much pressure to open the shraeder (or check valve) Probably about 70 psi.

If you had a shraeder valve on the neck of the un-bursted one, it could be screwed into a gauge. ..(CAREFULLY)...
Then add the pressure needed to open the valve connected to it...
Depending on how uniform the burst-disc material is you will know the bursting pressure.

If lower pressure is used, I recently saw an interesting tire gauge at a truck stop.
It has a brass 1/4" pipe about 6 or 8" long and a tiny release valve.
When the pressure is checked it holds (due to pressure in the brass pipe nipple part).
To re-set the gauge the tiny valve is depressed(releaseing the pressure).
And it's only $10!!!
Unfortunately I was short cash on hand.
It could possibly be used as a combination gauge and pilot (trigger valve).
I'll try to find a link... :) 8)
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Unread postAuthor: sputnick » Sat Feb 14, 2009 9:15 pm

Inonickname, I think that was rather unfair, those are much different, apart from being smaller, and MEANT for pressure, they still have different applications and material thicknesses and materials period.

I would actually love to see the pressure test results of one of those bottles, although truth be told I would imagine a miniature propane tank would be cheaper and a guarantee of safety,

Speaking of which, what are those little blue propane tanks rated to? because I do not want to have to hunt down more free fire extinguisher tanks...
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