[PSUBS-MAILIST] conical transitions

[Hugh Fulton]

Brian,

Not if the sphere is a hemisphere.  If it is a lesser part of a sphere then it depends on the angle of joining.  Theoretically the sphere would only need to be half the thickness of the shell.  

 

 

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of brian
Sent: Wednesday, 8 January 2014 10:46 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] conical transitions

 

Would the same apply to a cylinder to sphere transition?  On mine I'm planning on a 1" thick collar welded to the sphere then the cylinder to that .

brian

-----Original Message-----
From: "Hugh Fulton" <hc.fulton at gmail.com>
Sent 1/7/2014 12:45:24 PM
To: "'Personal Submersibles General Discussion'" <personal_submersibles at psubs.org>
Subject: Re: [PSUBS-MAILIST] conical transitions

Hi All,  

I have been through that problem and you have to have a good sized stiffener there of some sort.  I could not afford the room as an intrusion of internal space.

This is the solution and the angle of the additional reinforcing cone is 22.5 degrees being half the 45 degrees of the cone.  This survived an FEA analysis.  The end of the cone is where my window was attached.

This was a 48” shell  .  Regards,  Hugh

 

 

 



 

 

 

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of Jon Wallace
Sent: Wednesday, 8 January 2014 8:10 a.m.
To: Personal Submersibles General Discussion
Subject: Re: [PSUBS-MAILIST] conical transitions

 


Joe, ABS says stiffened cones are to have their ends bounded by two heavy stiffeners each located as close as possible to the point of cone-to-cylinder transition.

The stiffener is not located on the weld line but as close as possible to it.

Jon




On Tuesday, January 7, 2014 5:30:16 AM, Joe Perkel  <mailto:josephperkel at yahoo.com> <josephperkel at yahoo.com> wrote:


David,

Is that T ring directly on the weld line, or offset any distance?

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

Sent from Yahoo Mail for iPad

 




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