Re: [PSUBS-MAILIST] air pressure

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

>From: "Michael Wludarczyk" <divedawn13@hotmail.com>
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] air pressure
>Date: Tue, 15 Apr 2003 15:32:18 +0000
>
>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 = 4.0// 
>(correction: 0.20 X 20 = 4.0 PPO2)
>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.
>
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>>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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>
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