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Anthony:
	Your approach is pretty good, but much easier to check the manufacturers
specifications at sites like http://members.aol.com/jsuw3/tankspecs.html . 
From sight alone, you really can't know the proper fill pressure (unless you
read the stampings on the cylinder itself.)  
	Re your second question, almost all size cylinders are in use somewhere, and
if you look hard enough, you can almost certainly find someone using them
doubled up (or twinned.)

Cheers,
Bob

> -----Original Message-----
> From: anthony.appleyard@um*.ac*.uk*
> [mailto:anthony.appleyard@um*.ac*.uk*]
> Sent: Thursday, February 20, 2003 6:08 AM
> To: techdiver@aquanaut.com
> Subject: how do I measure the capacity of a cylinder?
> 
> 
> 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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