Re: [PSUBS-MAILIST] Calculations

[Warren Greenway <opensourcesub@yahoo.com>]

Ribs are irrelevant when the vessel is internally 
pressurized, but VERY relevant when the vessel is
externally pressurized. The two forms of abuse are
not equivalent.

Warren.

--- Chris Jackson <trumpetrhapsody@comcast.net> wrote:
> After futher research and sudgestions, I have found
> that at 100 meters the water exerts a pressure of
> about 162psi, but what I am not sure of is whether
> an air tank (decided on an air tank instead of a
> propane tank due to price and comments I have read
> about propane tanks) with a 165psi rating would hold
> up to that kind of EXTERNAL force, since I assume
> the rating aplies to the INTNERAL force rating.
>   ----- Original Message ----- 
>   From: Chris Jackson 
>   To: personal_submersibles@psubs.org 
>   Sent: Tuesday, July 08, 2003 1:12 PM
>   Subject: Re: [PSUBS-MAILIST] Calculations
> 
> 
>   I have recently aquired more information, however
> I still uncertain of several things. I found this
> link: http://hotconnect.com/tank/vertair.htm and I
> am considering the 36" by 98" tank made with carbon
> steel, but I am unsure which pressure rating to use,
> the depths I am considering will be in the 50-100
> meter range, but possibly shallower since this will
> mainly be used in freshwater
>     ----- Original Message ----- 
>     From: Chris Jackson 
>     To: personal_submersibles@psubs.org 
>     Sent: Tuesday, July 08, 2003 11:12 AM
>     Subject: [PSUBS-MAILIST] Calculations
> 
> 
>     I am trying to do some calculations to figure
> out such things as crush depth and required hull
> thickness. The constants are that the pressure hull
> will be 36 inches in internal diameter and 100
> inches long, and what I need to know is the
> relationship of hull thickness versus crush-depth
> with these parameters. If anyone can provide me
> results or information of a simple calculation
> program, I would be much appreciative.
> 
>     Thank you,
>     Chris Jackson


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