[PSUBS-MAILIST] Hull Calc: 78" spheres

[swaters@waters-ks.com via Personal_Submersibles]

Sean,
Perhaps I am interperting these wrong. I thought if the pressure at working depth is lower than maximum allowable working pressure then it passes ABS rules. If pressure at working depth is higher than maximum allowable pressure then it does not pass ABS rules. What am I looking for on these?
Thanks,
Scott Waters


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-------- Original message --------
From: "Sean T. Stevenson via Personal_Submersibles" <personal_submersibles at psubs.org> 
Date:01/09/2015  9:07 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres 

On 2015-01-09 18:16, swaters at waters-ks.com via Personal_Submersibles wrote:
Sean,
Can I ask you to do one more calc for me? 516 gr 70 sphere, 1" thick, 72" diameter. 
The 78" was not within ABS rules at 1000m. I think the 72" might just make it, yet give me more boyancy than the 60"
Thanks,
Scott Waters
Not sure where you're going with this.  The 60" sphere doesn't even make it at 1" thickness.  A 72" definitely won't.

72" OD, 1" wall, ASTM A516 Grade 70:



Just out of interest, I checked how small a sphere with 1" thick hull would need to be to get you to 1000m.  Turns out it's about 50 inches:



Sean

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