RE: [PSUBS-MAILIST] O2

["Sean T. Stevenson"<sts@telus.net>]

Pure oxygen is used no deeper than 20 fsw.  The partial pressure of oxygen at
that depth is about 1.6 ATA, which statistically is a reasonable maximum limit
for the decompression phase of a dive with the diver in the water.  Higher
PPO2s can be tolerated in dry environments (chambers, habitats, etc.) since
there is no pressure gradient across the lungs as there is when in the water.


-Sean

>Another source for O2 may be a dive shop that supports technical diving
>(wreck, cave, deep).  It is becoming more common for dive shops to mix a
>custom case mix using He, N2, and O2.  Nitrox used for recreational
>diving is enriched O2.  It is also common for tech divers that dive
>mixed gases to use pure O2 at 40ft for decompression and to purge N2
>from the body quicker.
>
>The only draw back is that the dive shop may require some certification
>card for at least Nitrox diving.  
>
>-Rob
>
>
=================================================================
Internet service provided by telus.net  http://www.telus.net/