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· Nigel Hewitt
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OK, I understand that extra lead is needed but these must be the way forward? The extra pressure and hence amount of gas available for the weight of the cylinder must make them a good thing?
Extra pressure doesn't do much for you are the Van der Waal forces mean you get less and less gas for the extra bar.
Also I gather they have a rather restricted life in sea water.

In another thread a maths error was distorting the picture. 4x400 sadly isn't 16000.

(edit)But if they are x-rayable maybe you could take them on aircraft so they would not eat you wallet as excess bagage as steel ones do but then where in the world could pump you 400 bar and not have cylinders for hire?(/edit)
 
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