[PSUBS-MAILIST] Hull Calc: 78" spheres

[Sean T. Stevenson via Personal_Submersibles]

That is correct, but I thought you wanted a 1000 m working depth?  The
1" wall thickness doesn't get you that deep.  For a 60" sphere, 0.75"
gets you 600 m, and 1" gets you 800.

Sean


On 2015-01-09 20:56, swaters at waters-ks.com via Personal_Submersibles wrote:
> 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
>
>
> Sent from my U.S. Cellular® Smartphone
>
>
> -------- 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
>
>
>
> 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
>
>
> Sent from my U.S. Cellular® Smartphone
>
>
> -------- Original message --------
> From: "Sean T. Stevenson via Personal_Submersibles"
> Date:01/09/2015 9:07 PM (GMT-06:00)
> To: Personal Submersibles General Discussion
> 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
>
>
>
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles

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