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RE: [PSUBS-MAILIST] Hull Penetration and Reinforcement



Hey Vance if you are prepared to send a copy I would happily pay for it.  Would love to have that on the wall framed.  rEgards,

Hugh

 

 

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com
Sent: Wednesday, 21 April 2010 1:44 p.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hull Penetration and Reinforcement

 

Well, I do have the PC-8 hull weldment drawing, which includes all that. It is a BIG drawing, drawn to go on the shop wall and to show all the details.

Vance

 

-----Original Message-----
From: Hugh Fulton <hc.fulton@gmail.com>
To: personal_submersibles@psubs.org
Sent: Tue, Apr 20, 2010 9:24 pm
Subject: RE: [PSUBS-MAILIST] Hull Penetration and Reinforcement

More to the point what was the PC-8 Conning tower Penetration  thickness and what was the reinforcing etc of the 8 viewports.  ASME / ABS allows for more holes but the overlapping of reinforcing allowable areas must be compensated for.  It would be great to get a blueprint of how it was built in that area

Regards, Hugh

 

From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com
Sent: Wednesday, 21 April 2010 1:10 p.m.
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hull Penetration and Reinforcement

 

It would be interesting to find out about the conning tower pens. My PC-8 print has a 28" pen, which allows for 8 X 8" viewports in the circumference. And I'm here to tell you, that's better than six.

Vance

 

-----Original Message-----
From: Jon Wallace <jonw@psubs.org>
To: personal_submersibles@psubs.org
Sent: Tue, Apr 20, 2010 8:38 pm
Subject: Re: [PSUBS-MAILIST] Hull Penetration and Reinforcement

Some additional information. 
 
1) Vessels under external pressure only need 50% of the reinforcement as a vessel under internal pressure. 
 
2) Reinforcement pads are no longer acceptable under current standards. All reinforcement must be integral to the hull and/or penetration nozzle. 
 
3) The maximum size hole for a vessel with diameter up to 60 inches, is 20 inches. So what do you do if you want a 24 inch ID conning tower? ABS says to submit plans for specific approval. ASME says that 2/3 of the reinforcement has to be within the "limits of reinforcement" which is the lessor of 2.5x hull thickness or 2.5x nozzle thickness. Since manned submersibles must have ALL reinforcement integral to the hull or nozzle, a 24 inch ID conning tower already complies with the 2/3 rule assuming you have followed all other requirements as well. 
 
4) I forgot to provide the link in my previous mail for the white paper proposing an alternate method of calculating reinforcement. One of the arguments presented by the author was that the current rules are so conservative they result in a material thickness that poses a structural threat to the pressure vessel due to the weight of the finished nozzle alone. I noticed that this paper was written in 2000 and although I have not seen the 2010 version of ASME BPVC rules, I know that in BPVC 2007 ASME had not adopted this papers argument. Of course, I'm not sure it was even submitted to ASME for approval. It's very interesting reading since the authors proposal is based upon FEA and field tests of prototype vessels that he shows match FEA results. 
http://www.codeware.com/support/papers/bildy.pdf 
 
Jon 
 
 
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