[PSUBS-MAILIST] New submarine

[vbra676539 at aol.com]

Alvin's new hull could not be built to ABS specs due to the ridiculous standards required for such a pressure vessel. The hull is Navy certified and the rest of the boat is ABS and Navy combined.
Vance



-----Original Message-----
From: Jon Wallace <jonw at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Wed, Apr 9, 2014 9:17 pm
Subject: Re: [PSUBS-MAILIST] New submarine


          
    
Wow, big difference here...ABS      calculator shows 2.5 inch thickness for 72inch sphere with maximum      working pressure of 2578 psi utilizing the ABS/ASME recommended      usage factor of .67 which takes into account material fatigue.
      
      I don't think the UnderPressure program considers usage factor.       If you discount the usage factor then the ABS calculator comes up      with 1.75 inch thickness with max working pressure of 2679 psi.  A      thickness of 1.5 inches provides 2303 psi, below your 2543 psi      requirement.
      
      Jon
      
      
      On 4/9/2014 6:53 PM, Alan James wrote:
    
    
      
        
Scott,
        
I make 1.23" thick for            a 72" ID sphere 516-70 to that depth, sea water. 
        
That was on the "free"            Under Pressure program. It should be somewhere in the ball            park.
        
Alan
        

        
        
          
            
              
  From:                "swaters at waters-ks.com" <swaters at waters-ks.com>
                To:                Personal Submersibles General Discussion                <personal_submersibles at psubs.org> 
                Sent:                Thursday, April 10, 2014 10:29 AM
                Subject:                Re: [PSUBS-MAILIST] New submarine
               
            

              
                
                  
Would anyone on psubs who knows how to use CAD                    run a pressure test on a simple 6' sphere with ASME                    516 grade 70 steel, then again with HY-80? What are                    required wall thicknesses to meet crush depth of                    5709 feet (2543 psi). If you have time maybe even a                    48" cylinder with ribs. 
                  
On a lighter note, Alec and I have been talking                    about hard to find things that I can make for psub                    members with my plasma robot. I am going to attempt                    making a manipulator arm kit that will be                    inexpensive and very functionable for our subs. I'll                    post progress as it comes.
                  
 
                  
Thanks,
                  
Scott Waters
                  
 
                  
                
              
            
          
        
      
    
    
  

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