Mailing List Archive Mailing List Archive
>I have a question for the net that has been stumping me for a while. It >goes like this... > >1) Your decompression ceiling is decided by your supersaturation level. >2) Supersaturation is defined relative to the partial pressure of the >inert gas in question (eg N2, He, whatever). > >So what the heck is going on when one switches to a hyperoxic mixture >while on a deco stop? My dilema is this: Say I do an air dive with such >a profile that I have a 20 ft deco ceiling. I go to 20 ft and hang out >for a while. My tissues are loaded with N2 to the point that reducing >the PN2 below the ammount that air at 20 ft produces (about 1.27 ata) is >not a good idea. The supersaturation level would be too high any >shallower. Now, to reduce deco time, I can switch to a Nitrox >blend. Say I switch to EAN-50. This brings my PN2 to 0.80 ata, which is >about the same a surface air. What makes this different, from a deco >theory perspective, from a direct ascent to the surface? Or is it just >that one bubbles, but 20 ft underwater is enough to keep it >sub-symptomatic? Very confused. Any ideas? >Jason >jturner@un*.ub*.ca* >Please give generously to help the .sig challenged > >-- >Send mail for the `techdiver' mailing list to `techdiver@opal.com'. >Send subscription/archive requests to `techdiver-request@opal.com'. Jason, The off gassing is speeded up by the difference in the partial pressures of the gasses produced by using the Nitrox. However, the gas has the same tendency to stay in solution as the pressure (20fsw as an example) has not changed. Hope this brief explanation helps. Harold Gartner 6900 Via Alba Camarillo, California 93012 home: (805) 482-9743 office: (213) 487-6240 CompuServe ID# 71470,1423 Internet: hgartner@ra*.or*
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]