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how many pounds (lbs) or ounces of Co2 are in a 154 CF C25 tank ?I remember seeing a formula on here for converting the weight to CuftMiller Xmt 350Lincoln Ln-25Ahp 200xSmith Gas Mixer AR/HTig is my Kung FuThrowing down dimes and weaving aboutInstagram http://instagram.com/[email protected]
Reply:1 pound = 8.7541 cu. ft. / 154 divided by  8.7541 = 17.591 so there's 17 and a half pounds in 154 lb tank but only 25% of that mixture is CO2 so reduce by 75%. I believe C25 is 75% Argon and 25% CO2. Or is it the other way around? ;-) But Wes, please check with a mathmetician you may know at DOD. I'm not a math whiz. I just recall what i learned in Chemistry.Last edited by jlames; 09-09-2013 at 12:54 AM.
Reply:Originally Posted by jlames1 pound = 8.7541 cu. ft. / 154 divided by  8.7541 = 17.591 so there's 17 and a half pounds in 154 lb tank but only 25% of that mixture is CO2 so reduce by 75%. I believe C25 is 75% Argon and 25% CO2. Or is it the other way around? ;-) But Wes, please check with a mathmetician you may know at DOD. I'm not a math whiz. I just recall what i learned in Chemistry.
Reply:Or Terry's a smart guy. He'd know!!!
Reply:Found thishttp://www.uigi.com/co2_conv.html
Reply:I'll take a crack at it1 cubic foot of CO2 = approx 0.1144 lbs of liquid CO225% of a 154 cubic foot tank = 38.5 cubic feet.Thus 38.5(0.1144) = 4.4 lbs of liquid CO2 made the appropriate amount.How'd I do? Dave J.EDIT: for the record jlames number comes out to 4.375 lbs of CO2 - I'd say we agree Jonathan Last edited by MinnesotaDave; 09-09-2013 at 02:36 PM.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:To keep a consistant mix, both the CO2 and Argon must be kept in gas form.  So no liquid CO2.The density of CO2 is close to the density of argon - allows one to use the same regulators and flow meters without changing the scale too much.So I would go with answer No. 1   and by that I mean 25% of 17.5lbsCon Fuse!Miller Dynasty 350Millermatic 350P-Spoolmatic 30AMiller Multimatic 200Hypertherm PowerMax 1000G3Miller Maxstar 200DX
Reply:so if i charge 4.375 pounds of co2 into a 154 cf bottle and top it off with argon i would essentially get a c25 mix in the bottle  ?Miller Xmt 350Lincoln Ln-25Ahp 200xSmith Gas Mixer AR/HTig is my Kung FuThrowing down dimes and weaving aboutInstagram http://instagram.com/[email protected]
Reply:In theory I would say yes.  Any residual pressure in the tank is also at 75/25 as well.  Any difference should be too small to notice.If I had the ability to charge my own tank I would try it for sure How are you trying to make the CO2 charge btw?  Are you going to flash off from a liquid tank into the empty?If it equalizes pressures in both tanks before you've put in the amount you wanted what then?  Just curious.I claim ignorance on the subject Dave J.Last edited by MinnesotaDave; 09-09-2013 at 06:25 PM.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Originally Posted by MinnesotaDaveIn theory I would say yes.  Any residual pressure in the tank is also at 75/25 as well.  Any difference should be too small to notice.If I had the ability to charge my own tank I would try it for sure How are you trying to make the CO2 charge btw?  Are you going to flash off from a liquid tank into the empty?If it equalizes pressures in both tanks before you've put in the amount you wanted what then?  Just curious.I claim ignorance on the subject Dave J.
Reply:Sounds like a good plan.  Why not use a Y adapter, two flow meters, two check valves, and just mix as you weld?Again, claiming ignorance - only seen it done, not done it myself.Dave J.Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Originally Posted by MinnesotaDaveSounds like a good plan.  Why not use a Y adapter, two flow meters, two check valves, and just mix as you weld?Again, claiming ignorance - only seen it done, not done it myself.Dave J.
Reply:Originally Posted by WookieWeldingplus i just wanted to do it to do it
Reply:Originally Posted by WookieWeldingoriginal thought was to cascade the co2 till i got the poundage i needed then top it off by cascading the argon and topping off the tankpretty much the same way i fill my smaller 154 cf of 100% argon off of 4 300cf bottles cascaded i do not use c25 often ... so this is just a thought i had to just fill it myself
Reply:Originally Posted by DSWIn theory it would probably get close assuming you did everything correctly. However not all gases behave the way you think they should when transfilling. Helium due to it's compressibility often acts "wonky" and you don't actually get the pressures you think you would get if you try to rush things and crap in the helium. I've never worked with CO2, so I can't say about that. Argon is a dense gas however and it heats up quite a bit when transfilling and that can often throw off your mix.Form a practical standpoint I'm not sure how cost effective this would be. You need two different fill rigs to match the different CGA fittings. You'd also need a fairly large argon cascade to arrive at even say a 3/4 fill in the smaller cylinder since gas equalizes by pressure, not volume. I'm betting even with 4 full 300's you'd still only get maybe an 780% fill at best under perfect conditions. After that the level would drop off super quick, say when yiou went to try and fill the next time. I'm to lazy tonight to crunch all the numbers, but from experience doing transfills, I wouldn't hold high hopes of getting a ton of "good" fills out of that set up. You could get quite a few C25 fills for just the cost of the transfill gear alone.Transfilling usually isn't cost effective unless you have access to large volumes of gas and are decanting into fairly small cylinders, say 80cf or less on average. It's not a bad way to fill say a small 20-40cf for small occasional site jobs if you have a lot of bulk gas at the shop. Otherwise you usually end up "wasting" money trying to transfill by the time you add up what the fill whip and extra cylinders would run you.