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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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