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Old 09-30-2008, 08:09 PM   #1
BullF-16's Avatar
Aug 2008
Posts: 102
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I found a 20 cubic foot CO2 tank at my local harborfreight. Looked about the size of a 5 lb tank. I have an aluminum 10 lb tank but want to use this as a spare. It is in the welding section and is steel. Will this work ok and about how many pounds is 20 CF of Co2 gas? Anyone know the conversion factor

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Old 09-30-2008, 09:05 PM   #2
springer's Avatar
Feb 2008
Wappingers falls NY
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One pound of liquid CO2 equals 7 cubic feet in its gaseous state. So I would say its a little under a 3lbs tank
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Old 09-30-2008, 09:54 PM   #3
jonp9576's Avatar
Aug 2008
Lansdale, PA
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a 20 cuft tank is 5 lbs of co2. most likely its an o2 tank though. the valve is different. any welding supply shop will change the valve for you, or just trade one with you.
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