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I came across a picture of a scuba set. Its cylinder could be 
measured at 7.7 inches diameter, 28 inches long including the boot 
but not the pillar valve. Its bottom end extended below the diver's 
buttocks when he stood on land. If both ends of its inside are 
hemispherical, if its walls are 0.35 inches thick, that works out at 
0.556 cubic feet internal volume, which pressurized to 250 bars 
makes 139 cubic feet = 5.15 cubic yards of air in it.
- Is that the correct way to work out the official listed capacity of a 
cylinder? If now, what is the correct way?
- Are cylinders that big used much? What is its listed capacity?
- Are cylinders that big ever worn twinned?

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