My kinda gal! :sappy: :lol3:
Deco Gas Question
- Thread starter TheDecoStop
- Start date
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eanxgirl
Guest
Yes, my moniker is not really accurate--but trimixoldlady didn't sound as good!
DiveGolfSki
Contributor
eanxgirl:
Why, you're both too young. :11:
wedivebc:
Well...I'm a bit of neophyte tek diver but to me it all seems like fairly straightforward stuff that somehow gets made mysterious for no good reason.
If you want to eliminate inert gas as efficiently as possible then you have to create the biggest partial pressure difference you can to drive it out at top speed. Oxygen isn't inert so you get the effect of *not* having the inert gas in the mix *plus* the metabolism of the O2, creating a vacant space that gets filled up with what ever is most willing (most concentrated) to come out of solution at that moment.
Driving the pO2 higher and higher and driving the inert gas out by moving shallower and shallower will open the so called "oxygen window". It's not magic. it's just a matter of getting your head wrapped around what they're doing. The most efficient stop, therefore is the 6 metre oxygen stop, at least in theory. No inert gas and pO2 maxed at the shallowest possible depth.
With the caveat that they've discovered that inert gas moves out *faster* when it's still in solution than when it has to come out of bubbles....(read RGBM) which basically means that it can be better to do some stops deeper to avoid bubble formation than to fix it after the fact. Also not magic. This should be old news to you.
The aversion to 80% can be found in the loss of efficiency but the added safety of 80% tilts the scales back a bit in my mind. Denying that these things are in a weigh scale by referencing things like skills and buoyancy control is a bit of peculiar "ostrich politics" typical to tek diving. It all depends on how fast you need/want to be out of the water.
Does that make any sense?
R..
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