Re: [PSUBS-MAILIST] Hull Penetration and Reinforcement

[Jon Wallace <jonw@psubs.org>]

Hugh,

It sounds like there should be some adjustment for the hull thickness 
when calculating the minimum radial thickness, otherwise you've got a 
constant that does not take operating depth (required thickness (Tr)) 
into account (as the height calculation does). Should it be 5% of the 
hole diameter plus the thickness of the hull?

Jon



Hugh Fulton wrote:
> Jon, I have been thinking about hull penetrations for hatches and 
> windows and looking at ASME / ABS. There is a very simple rule of 
> thumb that the reinforcing ring should be a */minimum/* radial 
> thickness of 5% of the hole diameter and the height of the reinforcing 
> should be a */minimum/* of 6 times the shell thickness. Somehow this 
> simple formula should be put into the ABS Hull calc tools. I.e. a 20” 
> diameter hole should have a 1” thick ring 24” should be 1.2”. We could 
> also just add a sheet to the existing ABS calcs, I’ll send a sample so 
> you can have a play. We need Cliff to check it. Regards, Hugh




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