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Scott, the MOD markings are usually as follows:
For deco mixes, 1.6
For working mixes: 1.4 or less
For example, the standard deco gasses are 35% (120fsw), 50% (70fsw) and
Oxygen (20fsw)
A resting decompression Po2 of 1.6 is a well established norm.
And, BTW, is sounds like you plan on ("contingency") breathing your working
mix at a 1.6 PPo2. If you have a real bottom below you, you should mix for
1.4 at the bottom. The benefits of pushing the PPO2s on a working mix are
minimal, and the downside is death. As kirvine says, you can survive the
bends, but not a tox.
At 09:29 PM 9/11/1999 -0700, you wrote:
>With all the discussion regarding tank marking...
>
>I've got a question about the practice of using 100% oxygen just before
>exiting (something which I have not started to do yet). I dive Nitrox
>regularly, and mark my tanks using the calculated mod, not the contingency
>depth.
>
> From what I've read, I see that WKPP divers mark the sides of their 100%
> O2 bottles with the number 20, signifying that one should not be below
> twenty feet when breathing the contents of the bottle. It seems that the
> 100% O2 bottle marking is an exception to using the MOD, since at 19.8
> feet the PP02 is 1.6 ata., which would be the contingency depth. If one
> were not using a full face mask when breathing off this tank, I would
> guess common sense would tell me that I should wait until I'm at the MOD
> before I take a breath.
>
>Is this correct, or did I miss something?
>
>Scott Gudmundsen
>Vernal, Utah
>
>
----------------------------------
Kevin Connell <kevin@nw*.co*>
NW Labor Systems, Inc
http://www.nwls.com
Who is John Galt?
----------------------------------
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