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Old 03-20-2011, 07:15 PM   #1
shtank
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Default Co2 filling question

I have a full 5lb tank that my LHBS loaned me for the weekend. I was wondering if I could hook the 5lb tank to my 20lb tank would gas from the smaller tank go into the bigger one. And should I turn the small tank upside down.

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Old 03-20-2011, 07:33 PM   #2
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CO2 tanks are filled with liquid CO2 under high pressure using special fittings and equipment. Don't try this at home kids.

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Old 03-21-2011, 12:35 AM   #3
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You could but it wouldn't be very practical. You might as well just take your 20lb to get filled.

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Old 03-21-2011, 02:55 AM   #4
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Essentially the pressures would seek equilibrium. The tank of the higher pressure would donate gas to that of the lower pressure. So depending on what you have in your 20 gallon, maybe. Does it sound safe?...not really.

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Old 03-21-2011, 04:12 AM   #5
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there will undoubtedly be more pressure in the 20# tank, so no, this won't work. you'll just end up filling the 5# one and if you don't have all the proper relief valves and such, you are just asking for trouble.

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Old 03-21-2011, 11:09 AM   #6
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The 20lb tank is empty. And it out of date. That's the only reason i was gonna try this.

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Old 03-21-2011, 11:59 AM   #7
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It works if you have the proper hoses (filling station). The colder you make the 20# tank the more CO2 you'll get in it. And, yes, you'll have to turn the 5 pounder updside down.

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Old 03-21-2011, 01:36 PM   #8
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http://www.homebrewtalk.com/f35/filling-my-own-5lb-co2-tanks-164074/

The link is to fill small from big, doing the reverse hardly seems worthwhile even as a temporary solution imo but I'd assume the technique would be the same.
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Old 03-21-2011, 04:41 PM   #9
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Quote:
Originally Posted by android View Post
there will undoubtedly be more pressure in the 20# tank, so no, this won't work.
Why would there be more pressure in the 20# tank?

Quote:
Originally Posted by shtank View Post
The 20lb tank is empty. And it out of date. That's the only reason i was gonna try this.
Well that's a dam good reason not to try it.

What are you trying to do? Steal all the co2 that they loaned you?
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Old 03-22-2011, 04:13 AM   #10
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Quote:
Originally Posted by bja View Post
Why would there be more pressure in the 20# tank?
i was assuming the volume of gas would be greater in the 20# tank, which would exert more pressure when the valve was opened (seeking equilibrium), but it turns out i was incorrect that any gas existed in the 20# tank.
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