Re: [PSUBS-MAILIST] Live Support System was (Cylinder choice.)

["Pierre Poulin" <pipo305@hotmail.com>]

Thank you very much Carsten and Dan. The info is very usefull.

Pierre





>From: MerlinSub@t-online.de (Carsten Standfuss)
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Live Support System was Re: [PSUBS-MAILIST] Cylinder choice.
>Date: Sun, 23 Mar 2003 08:48:16 +0100
>
>Hi Pierre,
>
>the air inside a normal size one- or two- man 1at sub reach about
>1-2 hours. In Sgt.Peppers 40 minutes. After this time you have to
>surface to refresh the air - or you will get headeges and later died.
>For this reason and to fullfill the class requirements the most
>sub have a L.S.S. = Live support system.
>
>The simplest one is :
>A CO2 scrubber with a electric
>blower and a bottle with oxygen (not air) and a barometer.
>If the barometer goes down because of the conversion
>from O2 to Co2 by your body - and the CO2 filtered out by the scrubber
>you have to open the oxygen bottle by hand until the barometer has
>again the original 1atm.
>
>The better one have a automatic vale to do this job.
>
>A little saftey feature will be a snorckel near the tower so you can use
>outside air directly to your mouth - and drive the boat also on the
>surface at rough sea with closed hatch - important at boats without a
>tower.
>
>A full size L.S.S like in the Euronaut will have :
>- Two groups of oxygen bottles, storage place outside the hull for
>saftey reason (imagine whats going on if a inside bottle with oxygen has
>an leak..)
>- One scrubber with scrubber cartridges and a storage locker with supply
>cartridge to extent the run time according to the class rules.
>- one barometer, one O2 indicator, one CO2 indicator, one H2 indicator
>- 12 V emergency battery , 24 Volt emergency battery
>- A suba pressure air line with conection points in all compartments
>with face mask - for air suplly in case of fire.
>- A second system in the diverchamber
>
>The idear you have with storage air and a constant flow like the
>most onshore decompression chambers have is not possible because :
>- you need a compressor to get the air flow out of the submarine
>if the submarine is dived, and in greater deeps the compressor needs to
>much power.
>- The storage of air-bottles will get really big..
>
>For dry ambient subs the air flow methods is more usefull because
>they divedeep is not so much and there is no compressor nessesary
>because of the all the time ambient compartment.
>Inlet and outlet should by away from together. And a
>soundsilencer on the in- and outlet vales makes possible sence.
>
>best regards - Carsten 			WWW.Euronaut.org
>
>
>
>
>
>
>
>Pierre Poulin schrieb:
> >
> > 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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