Re: [PSUBS-MAILIST] air pressure

["Michael Wludarczyk" <divedawn13@hotmail.com>]

Well Struijs,
with commercial submersibles, the batteries are in pods on the outside of 
the sub, and inside is only 1 athmosphere.When pressurising diving bells, 
you have high PP02,and the bell or chamber is constructed with cable and 
lights explosion proved with cables and wires having special 
connectors.March & Marine is a common brand connectors used in the 
commercial field.
Other gidelines you will find under ABS Standards "Pressure
vessels for human occupancy" Thouse are the gidelines for the USA.
In other countries you have other classification agencies, with similar
gidelines.In case you would like to have your sub insured, allways get
a classification, ( Inspection from the governing body ).
Or be a true pioneer.
Best regards, Michael.






>From: Thijs Struijs <thijs-struijs@planet.nl>
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] air pressure
>Date: Tue, 15 Apr 2003 22:21:35 +0200
>
>Michael,
>
>I thought that pressure compensation with air was common practice. Can it 
>be
>done savely to a depth of 100 mtr? There is plenty of compressed air in a
>sub. Nitrogen or CO2 would mean another thing to monitor, replenish and
>worry about.
>
>Btw, welcome to the list Matt.
>
>Thijs Struijs
>----- Original Message -----
>From: "Michael Wludarczyk" <divedawn13@hotmail.com>
>To: <personal_submersibles@psubs.org>
>Sent: Tuesday, April 15, 2003 5:32 PM
>Subject: Re: [PSUBS-MAILIST] air pressure
>
>
> > Hi Matt,
> > your idia of filling the container with 300 PSI is good, as long as you
> > don't use air: 300 PSI is about 20 bars, = estam. 200 meters in depth.
> > Air has a partial pressure of oxygen 0,20 / PPO2=0.20 X 300 PSI = 2.0
> > that is quiet high for batteries and sparks, and it is volantile.
> > So fill the batterie pod with nitrogen or co2. Or use gel cell bateries
>and
> > fill the pods with a light oil.
> > best regards:
> > Michael Wludarczyk. Commercial Diver and Submersible Pilot.
> >
> >
> >
> >
> >
> >
> >
> > >From: "Dan H." <JMachine@adelphia.net>
> > >Reply-To: personal_submersibles@psubs.org
> > >To: <personal_submersibles@psubs.org>
> > >Subject: Re: [PSUBS-MAILIST] air pressure
> > >Date: Tue, 15 Apr 2003 08:29:36 -0400
> > >
> > >Matt,
> > >
> > >If you charge the container to 300 PSI and sink it to a depth that
> > >corresponds to 300 PSI there is no problem.  All forces are equal.
> > >But, you can't safely say that a container that will handle 300 PSI of
> > >internal pressure will withstand 300 PSI of external pressure.
> > >The plastic soda (pop) bottle example has been used here many times.  
>It
> > >will withstand the pressure of the carbonated beverage internally but
>will
> > >begin collapsing in only a foot of water if empty.
> > >
> > >Filling the air space you described in your previously posting in tried
>and
> > >true.  What's usually used as a filler is a nonconductive oil.  
>Basically
> > >replacing the compressible air with a virtually non compressive liquid.
> > >
> > >Dan H.
> > >
> > >----- Original Message -----
> > >   From: JackThraven13@aol.com
> > >   To: personal_submersibles@psubs.org
> > >   Sent: Tuesday, April 15, 2003 12:17 AM
> > >   Subject: Re: [PSUBS-MAILIST] air pressure
> > >
> > >
> > >   Hey, and another thing, on a more appropriate thread, sorry to post
> > >again so soon.
> > >
> > >   Is it reasonable to expect a container that can hold a certain PSI 
>to
> > >resist crushing were that same PSI to be exerted on it's outer surface?
>For
> > >example, an air tank that can hold 300 PSI, would it withstand being
> > >submerged to a depth that exerts 300PSI on it's outer surface?
> > >
> > >   Just a thought,
> > >
> > >   ...Matt
> >
> >
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