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Hi Frank, You've run head on into something people in some parts of the world do with impunity, name something with a number that has little relation to anything. That 77.4 cuft tank is called an 80 because it sounds better. We do it all the time. A board called a "2x4" actually measures something like 1.4x3.4 since the 2x4 was before surfacing. The .38 Special handgun round actually measures .357. The .44 round measures .430. It goes on and on through firearms. Many of the automobile engine sizes are strangely rounded. Pipe sizes specify the inside diameter and are based on schedule 40 pipe. Since the fittings go on the outside of the pipe, a 4 inch schedule 80 pipe will have the same outside diameter as a 4 inch schedule 40 pipe, but there will be no dimension on the schedule 80 pipe that actually measures 4 inches. It looks like a database is the only way out of your problem. Before you do that, be advised that many of the tables you'll find are wrong. For instance, I have the table from http://www.fifthd.com/gear/tankspecs.html in front of me and it states that a Pressed Steel 120 is neutral empty and 3.8 pounds negative when full. I'm pretty sure pure helium weighs more than that. Have fun! Don ----- Original Message ----- From: "Franks" <wubben.stoop@12*.nl*> To: <techdiver@aquanaut.com> Sent: 28 March, 2003 17:45 Subject: Cylinder capacity Metric -> Imperial hello list, just for fun programming, i'm writing a palm pda application for gasmixing. The programm will be freeware. My gasmixer will have vdWaals algoritm and all kind of extra's in it; f.e. it can be used a. to mix the 300bar with 10 % overfill (5000 psi ) ; b. check the mix with a 85 euro balance ( theoretically helium accurate within 1% ) ; c. displaying sensor signals like O2, pressure, ..... ; d. just name it .... 256 Mb is a lot of programming code. Anyhow ... a lot is allready programmed ... in dutch with metric units. Also now i'm converting it into English with switch for metric/imperial units. But at the moment i have a problem with the cuft cylinder capacity. In the Metric system we define cylinders with water capacity and max. fill pressure. f.e. we have 12l/200bar, 12l/232bar and 12l/300bar. It's very easy to integrate this water capacity into the vdWaals algorithm's. To use imperial units, the cuft capacity has to be converted into water/ 14.5 psi capacity. http://www.mdaguam.com/tankspecs.htm and the conclusion that the convertion cannot be done with a algorithm. f.e.( according this ) the cuft of the low pressure cylinders = water capacity * fill pressure + 10 % ??????????????????????? hellllllllllllllllllllppppppppppp. When i see the high presssure cylinders 80 cuft = 77.4 cuft , and here it looks like that + 15% is choosen ???????????? more help. Are these data correct ? isn't there any defintion of the cuft ? So when this correct, the only way to let my programm function with imperial units, is to bring in a lot of database with all kind of cylinders and an interface to choose one of them. ( that's for fun ???) please give me some information/advice Frank -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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