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RE: flat hatch

Why does it need to be 60,000 psi?  At 36,000 fsw the ambient pressure is just slightly  over 16,000 psi. If your max depth is only 400 ft, all you need the hatch to withstand is at least 1.25 times the max depth rating of your sub. At 400 ft that number is about 223 psi, including the 1.25 factor. If you want to be in the safe side, a 500 psi hatch will be more than sufficient.



> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of STEVE
> McColman
> Sent: Tuesday, May 12, 1998 9:05 PM
> To: personal_submersibles@psubs.org
> Subject: flat hatch
> 
> 
> Thanks for all the advice guys!  But, does anyone know if there is an 
> actual spec for how thick the hatch would need to be to withstand 60,000 
> psi?   Oh, and Gary what do you mean by a "tank head".?  The end of a 
> propane tank ,maybe!           Steve
> 
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