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On Sun, 10 Sep 1995, Marc Dufour wrote: > >Can anyone help me with some formulae? > > > >I'd like to be able to convert liters to cubic feet (tank volumes) and vice > >versa, but can't find the formulae anywhere. > > Hmmm, lessee... a foot is (12 inches x 0.0254 m) 0.3048 cm. > > Cube this, and you get 0.028316846592 cubic meters. Since 1 cubic meter is > 1000 liters, divide this by 1000 and you get 28.316,846,592 liters per cubic > foot. So, roughly, your 80 cubic foot tank at 200 bar will hold > 80*28.316/200 liters, that is 11.3264 liters. So, 80 footers are 11 liters... > > So, liters = cubic feet * 28.316 / pressure (in bars). > > If I'm not mistaken, 1 bar is 14.7 psi or 1 kg/cm3 (gee, it's soooo much > easier in metric). > > For you spreadsheet fans, here's a model... > > A1:'Tank capacity B1:'Tank pressure C1:'Tank pressure D1:"Liters > A2:"(cubic feet) B2:"(PSI) C2:"(bar) D2:"at 1 bar > > A4: B4: C4:+B4/14.7 D4:+A4*28.316846592/C4 > > > Gentlemen, start your engines! (it's amazing how many cars are named after > spreadsheets: Lotus, Quattro, Excel)... > > ---- ==================================================== ---- > I prefer to give a bit of my liberty to an elected government > rather than to unaccountable corporations. > > * Marc Dufour * [\] ACUC 6 31874 * http://WWW.CAM.ORG/~mdufour * > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > Don't forget folks, that is at normal pressure (atmospheric) Some ppl classify them at service pressure (like the 80cu ft tanks which hold 80 cu ft at 3000psi. If this is the case, 80cu ft of air is 2265 litres of air) Bauchat classifies their tanks at working pressure as 2, 2.4 and 3 cubic meters even though the internal volume itself is less than that. An 80cu ft tank has an internal volume of 11 litres, but holds 2000+ litres at service pressure. Mike
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