How many CF is this cylinder?

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I have a cylinder for  shielding gas that is 37" tall to the top of the tank (not the valve), 7" diameter, how many CU FT is this cylinder?  I bought it used with my welder and the guy I bought it from does not know what size it was.  I also cannot find it on any site with dimensions, can anyone help?
Reply:There is a stickey at the top of this forum about tank sizes..This is in the stickey..http://www.airgas.com/content/detail...=7000000000234...zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:By the calculation there, it appears mine being 4" taller then the 80 cu ft that mine is a 90 cu ft?  Kind of weird, but possible.  How long are the bottles good for before they need to be reconditioned?
Reply:Test date will be stamped on the shoulder of the cylinder. Most are good for 5 years from the date stamped. If it has a "star" stamped after the  hydro stamp, it is good for 10 years.Post up picts of the markings and we can tell you when it's due for retest..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:Here is what it says:DOT3AA2015M8004539400Does this help?
Reply:Hydro stamp would look like these.The green one was originally tested 1 of 84, and then retested in 88(?), 93, 99, and finally on 04.  and would have been due for retest in 2009.The gray one pictured was tested 3 of 2008, so it would be due again in 3 of 2013.The small center marks would tell someone the test facility location. Attached ImagesLast edited by DSW; 01-17-2012 at 11:07 PM..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:I wouldn't worry about the stamps unless your going to have it refilled , usually (at least in my exp) they just trade you for one thats all ready filled.Lincoln pro mig 180Lincoln Square Wave Tig 300/wp 20/home built water cooler Victor, Purox, Harris, O/A welding/cutting setupsVintage Craftsman drill pressVintage Craftsman/Atlas 12"x 36'' lathe7''x 12'' w/c band saw Everlast 140 st
Reply:The last Ar tank that swapped @ maineoxy had an original stamp from 1952.  Half of the top was stamps!Buy American, or don't whine when you end up on the bread line.
Reply:Well this one is a 90 cuft bottle from what I can tell so they would be swapping it out for a 80 cuft most likely which is 10 less cu ft which I would like to have.  The other stamp which I did not see says "A7SC 92+ Star"  The guy who had it had a lot of bottles, all looking about the same age and has them refilled regularly by a local shop.  How much $ does it cost to have them retested and stamped?
Reply:My place dings me maybe $20 for a retest. As said though, most times they never even bother to look at the test dates when I swap the cylinder. The only time they really look at mine is when I bring in a pretty dirty cylinder that was most likely not one I've exchanged before. I know some places are a bit pickier about checking dates than others are, one reason it's nice to be well known at your local shop.One option might also be to see if they will "upgrade" your size when you swap it. My place simply charges for the fill, plus the difference in price between the two sizes. For example a 60 cf cyl is $120 to buy, an 80 cf is $160, so if you "upgrade from the 60 to the 80, you pay the extra $40 for the cylinder size, plus the gas and you are good to go.Looks like that test date was 92. The "+" means the cylinder was tested to 10% over the rated pressure, so a 2400 PSI cyl could be filled to 2640 psi for example. The "start" tells you the test is good for 10 years vs the normal 5 years..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:Originally Posted by jdu140cWell this one is a 90 cuft bottle from what I can tell so they would be swapping it out for a 80 cuft most likely which is 10 less cu ft which I would like to have.  The other stamp which I did not see says "A7SC 92+ Star"  The guy who had it had a lot of bottles, all looking about the same age and has them refilled regularly by a local shop.  How much $ does it cost to have them retested and stamped?
Reply:Originally Posted by rlitmanMy place charges me $15, but prices as high as $25 are still reasonable for a retest.But, what on earth makes you sure it's a 90CF bottle?  If you go back to the chart, you'll see that "SIZES ARE APPROXIMATE".  4" off is a perfectly normal variance between heights of bottles of the same capacity.  Many different companies have made these, and they all come out a little different.  I'd be much more inclined to believe you have an 80.
Reply:Keep in mind that the gas makes a difference in the volume a cylinder will hold.For instance a cyl that will hold 83 cf of argon will only hold 76 cf of nitrogen so volume isn't end all answer.From the sound of it you have a Q.Last edited by vwguy3; 01-18-2012 at 08:33 PM.
Reply:Check the bottom of the tank some times they have a  ring on it .
Reply:Nothing on the bottom, I will just take it there and see what they tell me!  I am not opposed to trading it in every time if it is less$, if it is more, I am not interested.
Reply:The plus mark usually indicates the tank is acceptable for overfill. Depending on several things as well as who does the refilling it wouldn't be unusual to get 90 to 94 cubic feet in an 80 CF bottle.http://www.metalartspress.com/PDFs/c...r_markings.pdfUnless you fall in love with your 'owner' bottle or there is some huge costs savings, swapping is usually the way to go. Here, for instance, they don't fill locally. Everything goes on a truck to Sacramento. So if you insist on having your own tank filled, they take it from you, put it on a scheduled truck south to get filled, then you have to go back after the return trip to pick it up. Big pain. Two trips to the swap shop no matter what."The things that will destroy America are prosperity at any price, peace at any price, safety first instead of duty first, the love of soft living and the get rich quick theory of life." -Theodore Roosevelt
Reply:I just traded up from 150 to 250 argon at my LWS  $130 with the gas!   SWEET!AEAD 200LE, Lincoln precision tig 185, Millermatic 251, Spectrum 625 extreme, Victor torch , Smithy 1220LTD. and  Do all C-4 band saw ,  Always adding.
Reply:I traded it in at a local shop, cost me $15 to have mine tested and $16.31 for an exchange, $31.31 out the door for a filled Q bottle, I was pretty darn happy about that.