[Member-Forum] Moment of Inertia

[Joe Perkel]

Paul,

Two earlier responses from me went wayward. If this one posts, then the problem is my iPad. 

Thank you for your input and offer. I need to do some number crunching when I get home from my current trip so as to reach a couple of those decision points you mentioned.

Thanks again!

Joe 

Sent from my iPhone

On Mar 25, 2014, at 5:10 AM, "Paul Moorhouse" <paul at steel-fish.com> wrote:

> Joe
> As it happens, this is my day job. I have been designing submarine pressure vessels for the last 28 years. I am sure there are others on the forum who do this but I am happy to help if you would like, and others at PSUBS should the need arise.
> Frame size and spacing is inter-related and there is no one answer. I have developed some models based on the European pressure vessel code PD5500 so running a new configuration is easy and surprisingly quick. PD5500 produces much lighter vessels than ASME VIII which is really aimed at chemical plant. In this way it is more similar to military codes but it does rely on quality assurance levels that do not generally come with home construction. So to cater for this, you put a factor in. I apologise in advance for all of the calculations being in metric but give me info in either.
> I would need to know
> ·        Outside diameter
> ·        Shell thickness
> ·        Shell material
> ·        Frame material
> ·        Diving depth
> ·        Length of parallel body
> ·        Ends, hemi or 2:1 dished.
> ·        Preferred frame spacing
> ·        Inside or outside frames
> I can send you the PDF of the work sheet as the PD5500 sums do look very pretty.
> The next step is to design the hatch penetration and I can help you here also.
>  
> This guy can thermo form your acrylic
> http://www.airesearch.nl/
>  
>  
> Regards
> Paul
>  
> Paul Moorhouse
> www.steel-fish.com
>  
>  
>  
> From: Member-Forum [mailto:member-forum-bounces at psubs.org] On Behalf Of Joe Perkel
> Sent: 25 March 2014 03:55
> To: PSUBS Member Discussion Group
> Subject: [Member-Forum] Moment of Inertia
>  
> Where did I see the rule of thumb for T-section rib sizing relative to shell thickness? I can't seem to find it now.
> 
> Joe
> 
> Sent from Yahoo Mail for iPad
>  
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