CO2 bottle

37 chief · Feb 19, 2021

Looking for a CO2 bottle, 40 cu ft. All I see are tanks by weight, like 20 pounds, 5 pounds. No mention of the cu ft. How are smaller CO2 tanks identified? Stan

jimg.allentown · Feb 19, 2021

Just a guess, but I suspect that because CO2 is a liquid under pressure, it is not sold or measured by volume, but rather by weight. That would be my educated guess.

johndeere720GA · Feb 19, 2021

Here is what I have come up with, it looks like a 5 pound cylinder would work:

john in la · Feb 19, 2021

I'm thinking welding co2 is sold by cu ft and beverage co2 is sold by weight.
The 5 lb size is close to 40 cu ft.

504 · Feb 19, 2021

Co2 is sold by weight,it really depends what you want to do with it.To run a Kegerator they use a 5# tank,they are about the size of a 2 liter soda bottle. For welding you need at least a 29# tank,they are the same size as a 60cf argon tank.If you buy an aluminum tank make sure it was made after 1994, or it was made by Carolina. The aluminum in some early tanks were brittle and are not to be refilled although a lot of places still fill them. Find the test date or the manufacture date before you by a tank,Co2 has to be retested every 5 years before it can be filled. You can buy them online but we will not fill a tank unless it has DOT numbers on it,some china tanks do not. I think if you go to Cyberweld.com you can see the differences.

37 chief · Feb 19, 2021

This cylinder will be for my TIG welder. It will be more argon, than Co2. Stan

Geo-TH,In · Feb 20, 2021

How many here reconize the equation PV = nRT? ideal gas law.

Move P to the right side of = and you get

V = nRT/P

Brings back old memories.

George.

1970-1655 · Feb 20, 2021

I just refilled my bottle for my MIG welder. I have an 80 Cu Ft. Gas combination I use is 75%/25% Argon/CO2. When in doubt you could go to a local welding supply and see first hand.

bc · Feb 20, 2021

(quoted from post at 08:28:50 02/20/21) How many here reconize the equation PV = nRT? ideal gas law.

Move P to the right side of = and you get

V = nRT/P

Brings back old memories.

George.

I don't recognize it off the top of my head. P probably equals pressure, V equals volume, and don't know about the nRT. Thanks.

dpendzic · Feb 20, 2021

I learned it as the universal gas law--used it a lot in my physics classes

Crazy Horse · Feb 20, 2021

Have you talked to your local welding supply house? I'm sure they could clarify it all for you in a minute or two.

1948CaseVAI · Feb 20, 2021

Perhaps you could just go to the local welding store and ask?

504 · Feb 20, 2021

Argon-Carbon Dioxide (75%25%) will be a cubic foot measure. It depends what you are going to TIG,steel is a different gas from aluminum. 80 cubic foot is about right for hobby welders.

CO2 bottle

37 chief

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jimg.allentown

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johndeere720GA

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john in la

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504

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37 chief

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Geo-TH,In

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1970-1655

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bc

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dpendzic

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Crazy Horse

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1948CaseVAI

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504

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