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Old 30-04-08, 04:07 PM
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Timbobaggins Timbobaggins is offline
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Join Date: May 2006
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Quote:
Originally Posted by Hickdive
Check my result please?

I'm not very good with figures and I've not done any kind of course on the subject but I was trying to bend my head round this today. I think that if I have a full (232bar) 12 litre cylinder filled with a 60% nitrox mix and I decant that into an empty 24 litre twin set so that the pressure across all three cylinders is the same and I then disconnect the single 12 and top up the twin set with air to 232 bar I should have a 33.88% nitrox mix in the twins.

Is this correct? If not, where am I going wrong?

I figure that the three cylinders will equalise at 77 Bar of which 60% is O2 i.e. 46.2 bar. I then top up with 155 Bar of air of which 20.9 % is O2 i.e. 32.39 bar so I have 232 bar of gas of which 32.39 bar plus 46.2 bar of which is O2, so that's 78.59 bar out of 232 bar or 33.88%.

Please note this is just me playing around with some hypothetical figures to see if I can figure it out - it isn't something I intend doing.
tools

Look under OTHER APPLICATIONS
Find the programme that says Decom Gas Mixer, download using password decom, hey presto a free gasmix programme

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