[PSUBS-MAILIST] New submarine

[Jon Wallace]

Wow, big difference here...ABS calculator shows 2.5 inch thickness for 
72inch sphere with maximum working pressure of 2578 psi utilizing the 
ABS/ASME recommended usage factor of .67 which takes into account 
material fatigue.

I don't think the UnderPressure program considers usage factor. If you 
discount the usage factor then the ABS calculator comes up with 1.75 
inch thickness with max working pressure of 2679 psi.  A thickness of 
1.5 inches provides 2303 psi, below your 2543 psi requirement.

Jon


On 4/9/2014 6:53 PM, Alan James wrote:
> Scott,
> I make 1.23" thick for a 72" ID sphere 516-70 to that depth, sea water.
> That was on the "free" Under Pressure program. It should be somewhere 
> in the ball park.
> Alan
>
> ------------------------------------------------------------------------
> *From:* "swaters at waters-ks.com" <swaters at waters-ks.com>
> *To:* Personal Submersibles General Discussion 
> <personal_submersibles at psubs.org>
> *Sent:* Thursday, April 10, 2014 10:29 AM
> *Subject:* Re: [PSUBS-MAILIST] New submarine
>
> Would anyone on psubs who knows how to use CAD run a pressure test on 
> a simple 6' sphere with ASME 516 grade 70 steel, then again with 
> HY-80? What are required wall thicknesses to meet crush depth of 5709 
> feet (2543 psi). If you have time maybe even a 48" cylinder with ribs.
> On a lighter note, Alec and I have been talking about hard to find 
> things that I can make for psub members with my plasma robot. I am 
> going to attempt making a manipulator arm kit that will be inexpensive 
> and very functionable for our subs. I'll post progress as it comes.
> Thanks,
> Scott Waters
>

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