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One small point, from what I understand about you chaps on the other side of
the pond, when you rate a cylinder in terms of cylinder volume (100 cubic feet
etc) this is the absolute volume of air compressed into a cylinder of
unspecified cubic capacity.

(It took me a long time to work this out !)

Over here, using metric terms, the stated cubic capacity of the cylinder (12
litres, 15 litres etc), is the water capacity. The gas storage capacity is the
stated volume multiplied by the gas pressure (a 12 litre cylinder pumped to
200 bar has 2400 litres of gas).

Please don't take offence, but in the table at the end of your last message,
'Cylinder volume' for you guys is the absolute gas available, for us guys its
the stated water capacity - gas available is then a seperate function of the
capacity and the gauge pressure.

Mark
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