Re: Air Use Calculations

["Scott L" <diver@chilli.net.au>]

FWIW,


Carbon Dioxide Levels 

     1% PCO2 0.01 US navy cutoff limit for closed circuit system CO2
absorbers.

     3% PCO2 0.03 Most divers sense stimulated breathing rate and depth.

     12% PCO2 0.12 Breathing stimulus does not increase much above this
level.

     25% PCO2 0.25 Resting patient still conscious due to depression of the
central nervous
     system.

     30% PCO2 0.30 Becomes anesthetic.
--------------

Since exertion (O2 consumption) and CO2 production are related it's
probably a good thing you can't move around too much in a sub. 

Scott
----------
> From: VBra676539@aol.com
> To: personal_submersibles@psubs.org
> Subject: Re: Air Use Calculations
> Date: Monday, November 01, 1999 5:17 AM
> 
> 
> In a message dated 10/31/99 6:04:08 PM, dirkpitt77@yahoo.com writes:
> 
> <<      I have to agree with you, Gary.  I don't think
> it's worth the trouble or the money to build in a
> scrubber when I'm only down for about an hour at a
> time.  If I were to get stuck on the bottom for longer
> than that, I'm probably not coming back up again
> anyways unless I flood the cabin n swim out.  As far
> as the "surface and replenish" thing goes, it seemed
> pretty easy to just design in a couple of fans and
> some ducts to circulate some fresh air in while on the
> surface.  
>  >>
> 
> Sounds like a man who's never been tangled on the bottom!
> Vance