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A refilled 20 lb tank of liquid CO2 costs about twice as much as a 40 CF tank of N2 gas.
A full CO2 tank weighs about 45 lbs vs 30 lbs for a full N2 tank.
You would also use your nitrogen regulator on the CO2 tank, It fits and the secondary gauge on the CO2 tank only goes to 60 psi. Not
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http://www.lmgtfy.com/?q=pound+of+co2+to+cubic+feet+gas
The general consensus seems to be 8.7 cuft to one pound. For blowing stuff out it's CO2 all day, but for pressure testing and sweeping systems go with DRY N2.
The boss wants us to use a regulator and blow kit for CO2, but at $5 a fill it's hard to justify buying the rig. I suppose I could get an adapter for my Nitro regulator, but I've never looked into it.
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I bought a co2 beverage regulator from foxx equipment. It was only like $40.
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Adapter and a piece of hose: FREE-99.Originally Posted by Mike19
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A nitro regulator goes right on a CO2 tank. Don't need a low pressure CO2 regulator.
Next change out I'm going to install a sight glass and use CO2 for blow out, purging, pressure testing and evacuation to see if the glass shows any moisture. Will let every know.
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Really? The tanks we have are a different connection.
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My tank is heavier and taller than the 40 CF N2 tank. It holds 20 lb liquid CO2 and cost $40 for a refill. The nitrogen regulator screws right on.
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This is the tank I've got. I believe its 20lbs as well.
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I guess my 20 lb CO2 tank holds 174 CF of gas which I'd a lot for one tank.
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Mike I got a Uniweld adaptor so my nitro reg screws on to the CO2 tank fitting.
https://www.google.com/search?q=uniw...90439954631152
“If You Can Dodge A Wrench You Can Dodge A Ball”
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My nitro tank has female threads.
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My tank also has female threads but looks like the same size. I just recently got my tank and used it once.
What is your all's opinion on using it for purging and evacuation?
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It should work fine, if you're going to pull a 500 micron vac on it then it shouldn't matter.
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Couple things.
First, CO2 is acceptable as a pressure testing and purge gas. Yeah, I know that some folks like nitrogen, but nobody has been able to provide consistent evidence against the use of CO2 as a purge gas or for pressure testing, so I continue to advocate for its use. Ideally, you would use "bone dry" CO2 and not soda fountain grade, but the difference is small in terms of moisture PPM and, as already noted, you're pulling a vacuum anyway, so a couple of PPM of moisture isn't that big of an issue.
The tank pressure in a CO2 tank will be lower than that in a nitrogen tank, thus you can safely use a nitrogen regulator for it. Check the PT chart for R744.
I need to get a new one as the threads are buggered on mine, but many farm stores or welding suppliers sell an adapter to fit a nitrogen regulator to a Co2 tank for under $20 and I'm pretty sure mine was under $10.
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Where's clover when you need him....
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This is a torch that I've had to take up from "Uncle Clover"
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