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| Originally Posted by RichC I'm not sure I understand this statement. Say you're at 6m doing the long stop on 80%. That's 20%N2 or a PPN2 of 0.32 (1.6*0.2). Surely then the only way you're net ongassing N2 is if the compartment value PPN2 is lower than 0.32 (and I'd contend it's not, unless you're diving heliox. Even if it is then I reckon I'm clean to come to the surface given that my compartment ppN2's are going to be 0.8 after saturation at the surface (provided I've offgassed any He, of course))?
So I don't think there's any net ongassing of N2. I will concede however, that you are offgassing N2 less efficiently since the gradient is going to be reduced compared to being on something with no N2 in it.....
Just curious as to if you meant that or if I'm going mad
Rich |
Rich
Yes I did mean that fast tissues offgas/ongass very quickly and will start on-gassing during the ascent, so if at 6m using 100% I cannot ongas any inerts and my off-gassing is maximised, due to the O2 Window. But if I use 80% or any gas containing Nitrogeen I wll still on-gas the fast tissues.
If you look at any of the deco programmes that produce a tissue pressre graph, you will see this effect.
Andy