[Member-Forum] Moment of Inertia

[Paul Moorhouse]

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 <http://overview.mail.yahoo.com?.src=iOS> 

Sent from Yahoo Mail for iPad

 

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