Re: Re: [PSUBS-MAILIST] pressure hull sizing

[rjune@fuse.net]

Just a quick caution note.
*CAUTION*
If you are using pure O2 you can experience O2 poisoning.
Or if you are using a pressurized hull, where the internal
pressure equals the water pressure at depth, and pressurized
air, O2 poisoning can occur around 100 to 120 feet.
O2 poisoning in itself is not dangerous, but a person affected
by O2 poisoning will tend to do stupid or un-rationale things
that result in death. For example a diver might think that he can
breath without his regulator.
> 
> From: Al Secor <wreckdiver@usadatanet.net>
> Date: 2002/05/05 Sun PM 09:11:23 EDT
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] pressure hull sizing
> 
> This has been covered before in the list archives.  You input O2 at the
> rate your body metabolizes it...somewhere between .8 and 1.0 liters per
> min at rest.  You circulate the cabin air through a CO2 scrubber which
> extracts the CO2 from the air.  As a result there should be no net
> increase or decrease in cabin pressure and it remains at 1 atm.  A
> simple baramoter can be used to keep track of the cabin air creeping up
> or down.  A valve to vent the cabin environment to the outside at the
> surface will equalize and small pressure differential to avoid any
> difficulties in opening the main hatch.
> 
> Al
> 
> DBACKIDS@aol.com wrote:
> > 
> > It seems that whether you put the excess air into a tank, or vent it
> > (which seems a better idea), you will still need a pump, because as
> > Adam said, the surrounding pressure also increases. A valve would only
> > equalize the pressure, would it not?
> 
> -- 
> Al Secor  ARS: WA3PWX  Scuba Instructor SSI DCSI #5528 TDI #1413
> http://www.geocities.com/SubDiverI
>