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Metric capacity depends on working pressure. To get volume of gas you multiply the working pressure (in bar) by the volume of the tank (in liters). This gives you the total liters of gas in the tank. 1 cubic foot equals about 28 liters, so you then divide by 28 to get capacity in cubic feet.
Not being terribly familiar with working pressure of metric tanks, I can't convert your volumes to metric.
A quick search of the archives yielded this table that explains the liter/pressure difference (netdoc was using PSI here as a result of where the thread was going):
Thanks for the replies. They're very very helpfull though I'm still digesting the numbers.
Qustion for Charlie99:
If an E130 holds 130 cubic feet of comressed air and a S080 holds 77.4 cubic feet. The E130 holds approximately 68% more compresed air than the S080.
Would I be able to apply the same comparsion in metric and say that an S080 with 11.1Litres @ 207 bar= 2297.7 Litres of air, then an E130 @ 232 bars will hold 68% more = 3860 Litres of air. Which brings the E130 closer to being a 17 litre tank.