anyone know what size this old gas cylinder is?

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I swapped for this up a few days ago. He said it was an old oddball size somewhere between a 80 cf and a 125 cf.It is 8.5 inches in diameter and 30.25 inches tall including the valve cap. It has the tare weight but not its volume so calculating its CF from its measurements is beyond me. Marked  TW 64 1/2 # V . 1st hydro is 3 77+ EE63 .Any idea what this cylinder type was called and its CF?I got it with 2 years left on the clock freshly filled with 25/75 Co/Ar for a old 100.00 guitar.After trying to match it with the tank charts online with no success I came here to the experts.
Reply:I believe it is an MC cylinder and is 10 cf. Sent from my iPhone using Tapatalk
Reply:Huh? That's got to be the worlds smallest washer and dryer in the back ground then. I've also never seen an MC cylinder with a cap on it.I'd guess his estimate is about right. I wouldn't worry too much about it. When you exchange it, you'll get what they give you. Claim it's on the bigger side. At worst all they can say is no it's not and give you the smaller size..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:Looks like a 40 cu ft cylinder to me. Sell a lot of them with Nitrogen for the HVAC guys and one of them even has oxygen in that size. It might be a 60 if it's bigger around than the 40 but the height is about right for a 40. Definitely not acetylene so can't be a MC or actually closer in size to a B.Millermatic 252XMT 304'sDynasty 280DXHypertherm PowerMax 1250Miller Trailblazer 302 EFIOptima PulserXR feeder and XR Edge gun and more athttp://members.dslextreme.com/users/waynecook/index.htm
Reply:The 8 1/2'' diameter seems odd for sure. Here's a couple tank size to check. http://www.airgas.com/content/detail...=7000000000234     http://media.whydevelop.com/o/www.ox...tion_guide.pdf
Reply:I've run into one like that before. A local customer bought it off ebay and wanted filled. My LWS did some research and it turned out that it was a specialty gas size cylinder.Millermatic 252XMT 304'sDynasty 280DXHypertherm PowerMax 1250Miller Trailblazer 302 EFIOptima PulserXR feeder and XR Edge gun and more athttp://members.dslextreme.com/users/waynecook/index.htm
Reply:40 is my guess too.
Reply:Also, the number 2015 in the 3rd pic is the max. pressure, not a date code. The top and bottom numbers in the 2nd pic are examples of hydro dates.JohnA few weldersA lot of hammersA whole lot of C-clamps
Reply:Do they de-rate cylinders that much? I am mainly wondering what to call it when I am trading it in. I am hoping they will swap it for a standard 123 - 125 class cylinder. Matheson filled it last year so they should take it but will they trade me down to a 80 or up to a 123 if it falls between them?  The cylinder is 8.5" by 25" to the top of the tank. Both the top and the bottom are semi hemispherical and should cancel each other out altho the bottom concave volume is smaller than the top convex area. I just simplified it by letting them be equal.I had started out by trying to calculate the volume. I tried to allow for wall thickness etc and came up with a 8.25" inside dia. by 24" height that gave me a internal volume of 1283 cubic inches or 21 liters.Then using the cylinder capacity calculation on the Air Liquide site I got 2000psi X 21 L / 14.7 air constant that gave me 2857.14 liters or 100.9 cubic feet . Does that sound about right?The size is a little bigger than the charts call out for a B size acetylene cylinder and thats as close as I have been able to track down.I was pretty sure that the DOT-3A 2015 was the max pressure rating, the numbers below that the serial number and manufacturers marks, and the 3 77+ as the original hydro test since it was centered and right below the tare weight mark as well as being the oldest date. The tank sat around from 1988 to 2010 as there is a big gap in the hydro dates.
Reply:I think it is a 55 cf.  I used to have a 55 that was "squatty" like that.GravelThe difference between theory and practice is that in theory there is no difference.
Reply:60cf tank. That's my guess.55 cf tanks are 7" diameter and about 27" tall.Torchmate 2x2 CNC with Flashcut CNC controlsHypertherm Powermax45 Esab ET220i Razorweld 195 MigRazorweld 200ac/dc TigTormach 770, Tormach xstechRazorweld, Vipercut/Vipermig, SSC Foot Pedal Dealer
Reply:Originally Posted by Gamble60cf tank. That's my guess.55 cf tanks are 7" diameter and about 27" tall.
Reply:I keep doing the math but get answers that make me unsure. an 80 cf tank is 7" by 36" including cap. my tank is .84 as tall but the circular area of its 8.5" diameter is 1.475 times greater than the 80s 7" diameter. If they were both the same diameter . mine would be about 67 cf as its shorter. but if they were both the same height mine would be 118 cf as mine is 1.475 times greater in circular area. Does this math come close? 80 times .84 = 67.777 times 1.475 = 99.97.  seems to me that it would be a 100 cf tank.  A 55cf is 7" by 26.5" a 60cf is 7" by 28" approximately including the valve. This tank would have to be larger volume as its taller and larger diameter. ( 8.5" by 29.5" including valve)
Reply:Originally Posted by GravelThe one I had was about 12" diameter... started life as a helium tank.
Reply:Soo, the math formula is pie times radius, times height.So pie, times 4.25 (Radius) is 13.551. Then you said the height is 30.25 WITH the cap. So take away about 5" for cap, so times 13.351 by 25 is 333.794.Then, divide by 12, to convert to feet. Thats 27.816 cubic feet.So, its a 30 cubic foot tank, unless my math is wrong, but I am 99% sure it is not.Thank you high school math.Correct me if I am off.
Reply:well CW its close.volume of a cylinder is r sq. * pi * h so 4.125" inner radius sq. *pi * h = 1309.68 ci or 0.7579 cf at atmospheric pressure. Then to calculate compressed volume it is psi * v / 14.7 (air constant )= 103.12 cf . That's the theoretical capacity . I don't know how much they de rate to get the standard fill capacity. A 80 cf tank calculates out to about 86 cf but they fill to 80. If that's about the same for my tank, its about a 97 cf tank.I am thinking that it was though of as a 100cf size. I have been using a bunch of online calculators and gas company formula pages to get all these numbers. Unfortunately I don't think the local gas supplier will be willing to exchange my 100 cf for a 123 when the time comes and I most likely will get stuck with an 80. Maybe I will get lucky and a nice guy will be at the counter. The other reason I wanted to know its size was to figure out about how much welding time it would give me. I am just starting out so I will be going through plenty of consumable to just get a halfway ok bead.oh here is a photo with a 24" by 16" square and a brown beverage bottle to show scale for those that thought it was a 20 or 40Last edited by wastric; 03-20-2014 at 12:26 AM.Reason: to add photo