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RE: [PSUBS-MAILIST] Cylinder choice.
You don't need a scrubber in an ambient sub. Just use scuba tanks
running through a regulator and then a flow meter to constantly flow
fresh air into the cockpit. The idea in an ambient sub is to always keep
the internal pressure the same as the external pressure. That means you
must be able to add air, and bleed air off, and do both without changing
the volume of air in the cockpit. The maintenance of this volume, and
the ability to bleed off excess air will take care of the air that flows
in from the scuba tanks, so the internal pressure will not build up. The
real challenge for the system is descending and ascending, as large
volumes of air will be required to be added and bled off in order to
maintain the cockpit volume.
Ron
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Pierre
Poulin
Sent: Sunday, March 23, 2003 8:39 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Cylinder choice.
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.
> > >
> > >
> > > >
> > > > Hi gang!
> > > >
> > > > I would like to konw what kind of cylinders you are using for
>breating
> > >air.
> > > >
> > > > Thanks.
> > > >
> > > > Pierre Poulin
> > > > "the ice is melting now!"
> > > >
> > > >
> > > >
> > > > ________________________________________________________________
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