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Re: [PSUBS-MAILIST] Cylinder choice.

To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Cylinder choice.
From: Warren Greenway <opensourcesub@yahoo.com>
Date: Tue, 25 Mar 2003 11:07:26 -0800 (PST)
In-Reply-To: <200303251653.h2PGrJov016532@bachelor.West.Sun.COM>
No, the CO2 levels can't get too low. The Nitrogen
levels could, but you won't be scrubbing the Nitrogen.
CO2 can be brought to zero without any harm to the
human element. Obviously O2 levels can get too high,
in which case you will die from O2 poisoning. Again,
www.dolphinscuba.com has a series of books on air
mixtures and such.

Warren.

--- Ray Keefer <Ray.Keefer@Sun.COM> wrote:
> Hi All,
> 
> This leads to a question that has bothered me for a
> while.
> 
> Can one make a CO2 scrubber too effecient? Would it
> be harmful if in a
> 1 atm sub you scrubbed all the CO2 out of the air?
> You would be left N
> and O2.  Is that bad?
> 
> Does one need to have a CO2 sensor to turn off the
> scrubber if the CO2
> levels get to low?
> 
> Regards,
> Ray
> 
> > Date: Sun, 23 Mar 2003 18:34:35 -0800 (PST)
> > From: Warren Greenway <opensourcesub@yahoo.com>
> > Subject: Re: [PSUBS-MAILIST] Cylinder choice.
> > To: personal_submersibles@psubs.org
> > 
> > Just keep in mind that O2 becomes toxic under
> > pressure.
> > CO2 and CO levels must be held to a few percent,
> or
> > you could black out or die. Go to
> www.dolphinscuba.com
> > for books that describe air supplies for divers in
> > detail.
> > 
> > Warren.
> > 
> > --- Pierre Poulin <pipo305@hotmail.com> wrote:
> > > Thanks guys.
> > > 
> > > Dan or Cartens or anybody else,
> > > 
> > > If you can breath 1 hour with the air in the
> sub,
> > > how long can you extend 
> > > that 1 hour with a scrubber system?
> > > 
> > > Also, in my ambient sub. If I have 1 hour air at
> > > 1atm, will I have 2 hour at 
> > > 2atm? 3 at 3atm, etc... since there is 2, 3 time
> the
> > > amount of o2 in the 
> > > ambient air. Will I exhale 2, 3 time more co2?
> > > 
> > > Maybe this is a good question for Herve?
> > > 
> > > By the way, I found a perfect place to first try
> my
> > > sub. It's a tank that is 
> > > 10 X 10 X 10 foot. The top is at floor level. I
> have
> > > acces to a fork lift to 
> > > raise the sub if need be, I can adjust the water
> > > level in the tank and the 
> > > water is at 30 deg C!!! Just want to share my
> > > happiness with you guys...
> > > 
> > > Thanks again!
> > > 
> > > Pierre Poulin
> > > 
> > > 
> > > 
> > > 
> > > >From: "Dan H." <JMachine@adelphia.net>
> > > >Reply-To: personal_submersibles@psubs.org
> > > >To: <personal_submersibles@psubs.org>
> > > >Subject: Re: [PSUBS-MAILIST] Cylinder choice.
> > > >Date: Sun, 23 Mar 2003 11:02:20 -0500
> > > >
> > > >Piere,
> > > >
> > > >You can't beat Carstans explanation.  He's far
> more
> > > experienced then I am.
> > > >I've done some research but am still in the
> > > building phase.  I'm about 2/3
> > > >done with my K-350.
> > > >
> > > >It does however have a snorkel like Carstan
> > > mentioned on the conning tower
> > > >for the purpose of breathing outside air as
> long as
> > > possible while sealed 
> > > >in
> > > >the sub.  The snorkel has a float valve on the
> > > outside and a ball valve on
> > > >the inside to lock it off while submerged.
> > > >
> > > >I will carry supplemental O2 and a CO2
> scrubber.  I
> > > may not carry a full 72
> > > >hours supply though.  Most of my diving, if not
> > > all, will be in easy to
> > > >reach places and not to any great depths.  If
> that
> > > changes I will add more.
> > > >
> > > >In a K-350 I am told that a planned surface and
> > > venting every hour is
> > > >advisable.  The upper limit of a person
> surviving
> > > is around five hours "AT
> > > >REST."  But who will actually be at REST if
> > > entangled on the bottom?
> > > >
> > > >My sub also has a 2 inch flood valve to
> equalize
> > > pressure and allow escape
> > > >with a bail out bottle if the depth permits as
> a
> > > last effort.
> > > >
> > > >Dan H.
> > > >
> > > >----- Original Message -----
> > > >From: "Pierre Poulin" <pipo305@hotmail.com>
> > > >To: <personal_submersibles@psubs.org>
> > > >Sent: Saturday, March 22, 2003 9:41 PM
> > > >Subject: Re: [PSUBS-MAILIST] Cylinder choice.
> > > >
> > > >
> > > > > Hi Dan!
> > > > >
> > > > > You only breath the air that is inside the
> hull?
> > > With only a scrubber
> > > > > system? I presume your sub is a 1atm type.
> What
> > > is the time you can be
> > > >under
> > > > > water?
> > > > >
> > > > > What about the 72 hours autonomy emergency
> > > reserve?
> > > > >
> > > > > I always presumed that in 1atm sub there was
> a
> > > constant flow of fresh 
> > > >air
> > > > > comming in and a pump to blow out the excess
> > > pressure.
> > > > >
> > > > > My sub is a dry ambient. Can I breath only
> the
> > > air inside the hull once 
> > > >it
> > > > > is equalized?
> > > > >
> > > > > Thank you very much. I know those questions
> are
> > > very basic but I
> > > > > misunderstood them from the beginning.
> > > > >
> > > > > Pierre Poulin
> > > > >
> > > > >
> > > > >
> > > > >
> > > > > >From: "Dan H." <JMachine@adelphia.net>
> > > > > >Reply-To: personal_submersibles@psubs.org
> > > > > >To: <personal_submersibles@psubs.org>
> > > > > >Subject: Re: [PSUBS-MAILIST] Cylinder
> choice.
> > > > > >Date: Sat, 22 Mar 2003 19:50:54 -0500
> > > > > >
> > > > > >None for breathing air.  If you bread out
> of a
> > > cylinder you have to
> > > >exhale
> > > > > >within the hull, raising the internal
> pressure.
> > >  A small tank for
> > > >emergency
> > > > > >exit is a good idea though.  While dived,
> > > breath the air contained 
> > > >within
> > > > > >the sub hull itself.
> > > > > >
> > > > > >I have two SCUBA tanks for blowing ballast.
> 
> > > One to use and one for
> > > > > >reserve.
> > > > > >
> > > > > >Dan H.
> > > > > >
> > > > > >----- Original Message -----
> > > > > >From: "Pierre Poulin" <pipo305@hotmail.com>
> > > > > >To: <personal_submersibles@psubs.org>
> > > > > >Sent: Saturday, March 22, 2003 9:49 AM
> > > > > >Subject: [PSUBS-MAILIST] Cylinder choice.
> > > > > >
> > > > > >
> > > > > > >
> 
=== message truncated ===


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References:
- Re: [PSUBS-MAILIST] Cylinder choice.
  - From: Ray Keefer <Ray.Keefer@Sun.COM>
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