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From: "Gliviak, Jozef" <Jozef.Gliviak@co*.co*>
To: "'Sean T. Stevenson'" <ststev@un*.co*>
Cc: techdiver@aquanaut.com
Subject: RE: decompresion gas selection and procedures
Date: Tue, 7 Dec 1999 09:34:03 -0000
Hello Sean,

>Something like 5 minutes every 25, and they need to be to the
> LOWEST breathable PPO2 gas, ie. bottom mix.
>Do not add time to your stops to accomodate these (Air) breaks. 
Sorry, just to make sure I understand well .Which option do you use
if your software tells you to do e.g 40min deco on O2:
1. you actualy do 25on O2, then 5 on low PpO2 gas and 10 on O2 - Total 40
min.
2. or 25 on O2, then 5min break and 15 on O2 - Total 45 min


>You also will notice an improvement if you use trimixes as deco gases,
>such as 35/30 and 50/25, in addition to the oxygen.
Please, would you be so kind and explain why is it good to add He to your
deco
gas (e.g 50/25) ? Everything I know tells me that Nitrox 50 would be more
appropriate.
I know that some guys use it this way, just couldn't figure out why it is
better.
As far as I know by using Nitrox you create highest presure differential for
Helium
causing it's accelerated offgassing.


Regards

Jozef Gliviak
Slovakia
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