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Air tank idea.

A place to ask general spud cannon related questions.
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Air tank idea.

Unread postAuthor: warhead052 » Fri Apr 15, 2011 11:18 am

Ok who knows what those metal water bottles look like? Anyone know what I am talking about? If you do, good for you. What if you put a schrader valve in the bottom of it, seal it in and epoxy it in place then place a fitting on the top with a ball valve so its like a co2 canister? Good idea/theory? It might work because well 1, its made out of metal, 2 its the same principle as modding a FE and 3, I dont know how much simpler it could get because you can find these bottles almost everywhere. Let me know what you think, and even try it if you want... I dont have any valves or fittings to try it at the moment, but if you do, give it a try!
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Unread postAuthor: jakethebeast » Fri Apr 15, 2011 11:23 am

nah, if i now what are you meaning, DONT EVEN THING ABOUT! those bottles are veak, mayby max 150psi before burst, or even less.

For your own safety i suggest using other type airbottle
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Unread postAuthor: Gaderelguitarist » Fri Apr 15, 2011 11:26 am

It would be just as simple to use metal pipes. These bottles have been discussed before.

What you would have to do is have a ball valve connected to a tee that then connects to the bottle, as well as your fill valve. Putting a hole in the bottle would not be smart, because while it is aluminum, it is still very thin. In fact, I wouldn't trust one beyond 100 PSI.
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Unread postAuthor: warhead052 » Fri Apr 15, 2011 11:26 am

Yeah I understand they are weak, the ones that come with like lunch boxes... I am talking one that has think walls, e.g "anti dent" Anyways 150 psi for what I would use it for is perfect....
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Unread postAuthor: mark.f » Fri Apr 15, 2011 11:32 am

Any chance of you getting an accurate measure of the wall thickness? No way of saying for sure how much the bottle will hold without that.

Also, if it is a uniform thickness all the way round, the base would be a rather weak area.

Overall, I would say find something else to use.
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Unread postAuthor: warhead052 » Fri Apr 15, 2011 11:35 am

Just a theory... I was thinking about using it, but I probably wont. I have another idea for it, but I may not post the idea till I get some measurements.. Anyways, if I do end up doing this, I will bury it under ground, then put my reinforced steel box over it for added protection, then pressure test it. If it exceededs 150 psi what would you say to it?
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 15, 2011 11:37 am

Have a read through this thread: http://www.spudfiles.com/forums/aluminu ... 22251.html

It would really help if you used the search buttonto look for previous knowledge instead of posting ideas as they form in your cranial cavity ;)

warhead052 wrote:1, its made out of metal


So is a soda can, why not use that :D

2 its the same principle as modding a FE


FEs are made to take pressure, and are certified to a safe pressure usually marked on the cylinder, it is NOT the same principle

3, I dont know how much simpler it could get because you can find these bottles almost everywhere.


By the same logic, you could make a chamber out of walmart ;)
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Unread postAuthor: jhalek90 » Fri Apr 15, 2011 2:05 pm

Remember the metal at the neck is twice as thick as the test of the bottle, so it holds threads..

I once cut one in half with a bandsaw, they are as thin as plastic bottles, and I decided against using one.
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Unread postAuthor: cammyd32 » Fri May 06, 2011 5:14 pm

Why not make your own pressure tank from thick large copper pipe reducers as schrader valve and copper endcaps? then it would be both safer because;
1- Thick copper is probably stronger than using aluminium bottles
2- if it does fail at high pressure the solder used to hold the thing together will crack before the copper does so the whole thing does not rupture spraying metal shards at you
(correct me if i'm wrong!!!!)
3- copper cracks not explodes so any fail will not be of the massive explosions you get with steel or aluminium(again please correct me if i'm wrong!!!! I am no expert on the subject)
8)
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Unread postAuthor: Doctore » Fri May 06, 2011 6:21 pm

I only use co2 tanks or iron pipes
Long time ago i used plastic bottles :D
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Unread postAuthor: Crna Legija » Fri May 06, 2011 9:55 pm

cammyd32 wrote:Why not make your own pressure tank from thick large copper pipe reducers as schrader valve and copper endcaps? then it would be both safer because;
1- Thick copper is probably stronger than using aluminium bottles
2- if it does fail at high pressure the solder used to hold the thing together will crack before the copper does so the whole thing does not rupture spraying metal shards at you
(correct me if i'm wrong!!!!)
3- copper cracks not explodes so any fail will not be of the massive explosions you get with steel or aluminium(again please correct me if i'm wrong!!!! I am no expert on the subject)
8)




if your did a good job and use proper solder the joint should be the strongest part and the pipe would fail.
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Unread postAuthor: Technician1002 » Sat May 07, 2011 12:36 am

Your safest bet is to use something designed from the ground up for the pressure range you intend to use.

Some can be slightly modified for a larger valve. :D
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Unread postAuthor: warhead052 » Sat May 07, 2011 11:37 am

Eh its fine. I have a 30lb freon recovery unit tank that I am using now...
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Unread postAuthor: wyz2285 » Mon Sep 17, 2012 5:01 pm

I used to use a aluminum water bottle as pressure vessel. The bottle as 0.8l, the inner wall thickness it's about 3 mm max, probably around 2 mm. With a repeat use at 10 bar, there is visible deformation in the base. The highest pressure ever used with it was 20 bar, and I'm pretty sure the base/lateral join is going to rupture with just a little more pressure.
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Unread postAuthor: Marseyus » Tue Nov 06, 2012 11:26 am

Like the guy said earlier, paintball tanks, but HPA paintball tanks are even better, depending on what pressure your trying to get to. An HPA tank that can hold 3k psi is about 50 bucks, and an old school 20oz Co2 tanks is 20 at wall mart. Paintball tank adapters are cheep, and the co2 ones are mainly metal and easier to machine, some of the HPA tanks are carbon fiber, and simply a pain to use. And remember if you can try to not drill into the tank, and just fill and release through the valve, your tank will last longer, and hold together better. Propane tanks are good also same idea, and i think the adapters are cheaper and easier to find. If you really wanna go all out, and have the money too, i can find you a 4500 psi firefighter tank for around $200. The adapters are easy enough to find, a little pricy, but i got a few laying around i've used for various projects. Any questions re-post or drop me a message more than glad to help.
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