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> I'm not too convinced about the filling-order argument either if > filling is by partial pressures, weight or whatever. Unless inert > gases really DO slow reactions ... then say pumping to 40% of 230 > bar on pure O2 followed by whatever on N2, Ne, He or whatever should > be of no consequence. ie the PARTIAL pressure of O2 is the same (ca > 92 bar) at both the part-filled and full stages. I do see a difference in whether or not to add O2 first or air first when blending nitrox. The assumption is that combustions are more likely to occur in the valve than in the cylinder. This is a reasonably safe assumption, because there really isn't anything that could ignite a combustion within the cylinder. If you put 50bar O2 in a cylinder and top off with 250bar air, then the highest PO2 in the valve is 100 bar (the final PO2 in the cylinder). But if you put 250 bar air in first then top-off with 50 bar O2, then the valve is exposed to 300bar O2 during the fill. It's better to add the O2 first. Aloha, Rich
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