Bottle Size?

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How do they measure bottle sizes & welding gasses?  Ox, acc, Co2, mix ect.  How do I know a bottle is full from the supplier?
Reply:It's computed based on the volume of the gas at stf atmospheric conditions. So a known bottle size for a certain gas at XXXX psi is equal to XXXcubic feet. The bottle pressure will vary with temperature, but you can only hope that the supplier has done the calculations to figure at the ambient temperature the amount of gas required to make the tank "full." (in PSI) But I'm sure no one does that and they just fill it to whatever PSI that they do for that particular gas and call it full. Co2 is filled as a liquid and is measure in weight. Each gas is a bit different and some are filled by weight and others by pressure
Reply:How are they sized by dia. & height?
Reply:There's no actual "standard" for sizes. It varies depending on the manufacturer and when they made them. This will give you a very rough idea about sizes. Note as you look thru the charts that many list "similar" physical sizes but at differnt volumes. http://www.rentshopinc.com/PDF-Files/Cylinder_chart.pdfhttp://www.scottecatalog.com/scottte...der%20Sizes%3Ahttp://www.airgas.com/content/detail...=7000000000234http://gasandsupply.com/articles/cyl...sizes-pg64.htmhttp://www.airproducts.com/NR/rdonly...nformation.pdfAlso note that pressure has a lot to do with how much gas is in the cylinder. From the chart in the 4th link, an 8.5" x 51" cyl @ 2015 aprox equals 224cf of gas. The save size cyl but rated for 2265 would get you 277 cf of gas. I have some 2400 psi cyl that are about the same size that are listed as 300cf cyl by my suplier, so physical size doesn't tell you the whole picture.Last edited by DSW; 02-09-2011 at 03:55 AM..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