[PSUBS-MAILIST] Hull Calc: 78" spheres

[hank pronk via Personal_Submersibles]

Scott,
You should get a price from EE because your dollar is very high right now and the oil patch is laying off due to low oil price.
Hank--------------------------------------------
On Fri, 1/9/15, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres
 To: "Personal Submersibles General Discussion" <personal_submersibles at psubs.org>
 Received: Friday, January 9, 2015, 10:49 PM
 
 Sean,Can
 you point me to the direction to writing a spec contract for
 two hemispherical heads withing the requirements needed? I
 am still learning and got a long ways to go. I truely
 appriciate the help.Thanks,Scott
 Waters
 
 Sent
 from my U.S. Cellular® Smartphone
 
 -------- Original message --------
 From: "Sean T. Stevenson via
 Personal_Submersibles"  
 Date:01/09/2015  8:46 PM  (GMT-06:00) 
 To: Personal Submersibles General Discussion  
 Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres 
 
 Yeah, you really need to cross your t's and
 dot your i's when tendering a bid or ordering a part to
 specification. Anything not explicitly spelled out is
 subject to interpretation or disregard.  I always
 create completely dimensioned and toleranced engineering
 drawings for this purpose, in addition to material
 specifications and test performance requirements, and make
 clear that if the part doesn't pass QC, the supplier is
 responsible for correcting the problem. I get such an
 agreement signed. Of course, I have the benefit of having
 been doing this professionally for years. Strict hobbyists
 cannot be expected to be as informed.
 That said, I would take the required
 tolerances, roundness, test procedures and so forth right
 out of the guides, and present this when getting quotes so
 that I get the true cost for what I need, and discover right
 away if it is not within a supplier's capabilities.
 How did your dome turn out? Were you able to
 correct it?
 Sean
 
 
 
 
 On January 9, 2015
 7:29:44 PM MST, hank pronk via Personal_Submersibles
 <personal_submersibles at psubs.org> wrote:
 
 Sean,
 EE did my parts and my dome was quite bent when sitting on
 the bench.  They told me too bad, it is within ASME specs.
 Hank
 On Fri, 1/9/15, Sean T. Stevenson via Personal_Submersibles
 <personal_submersibles at psubs.org> wrote:
 
  Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres
  To: "Personal Submersibles General Discussion"
 <personal_submersibles at psubs.org>
  Received: Friday, January 9, 2015, 9:24 PM
  
  I never thought to add the functionality to solve
  for diameter. I'll have to look into that.
  I'll run your calc. Stay tuned.
  Sean
  
  
  
  
  On January 9, 2015 6:16:50
  PM MST, "swaters at waters-ks.com via
  Personal_Submersibles"
  <personal_submersibles at psubs.org> wrote:
  Sean,Can I ask you to do one more calc for
  me? 516 gr 70 sphere, 1" thick, 72"
  diameter. The 78" was not within ABS rules
  at 1000!
  m. I
 think the 72" might just make it, yet give
  me more boyancy than the
  60"Thanks,Scott
  Waters
  
  Sent from my U.S.
  Cellular® Smartphone
  
  -------- Original message
  --------
  From: "Sean T. Stevenson via
  Personal_Submersibles"  
  Date:01/08/2015  8:28 PM  (GMT-06:00) 
  To: Personal Submersibles General Discussion 
  
  Subject: Re: [PSUBS-MAILIST] Hull Calc: 
  78" spheres 
  
  
      On 2015-01-08
  19:01, via
        Personal_Submersibles wrote:
  
      
      That's what I got.
            Only without the format. Sweet. Thanks Sean.
  It's going to
            take a syntactic buoyancy package to get it
 right,
  but it
            looks like a decent alternative. A 6 1/2 foot
  sphere displaces
            about a thousand pounds more than the pair of 5
  footers.
            Pretty close, and might be marginally less
 
 expensive. What
            would a 39" radius do for depth in the
  thicknesses you have
            already given?
          Vance
  
          
        
      
  
      As
          requested:
  
          
  
          ASTM A516 Grade 70, 78" sphere, 0.75"
  wall:
  
        
  
      
  
      
  
      ASTM A516 Grade 70, 78" sphere, 1" wall:
  
      
  
      
  
      HY-100, 78"
          sphere, 0.75" wall:
  
      
  
      
  
      HY-100, 78" sphere, 1" wall:
  
      
  
      
  
      Sean
  
      
  
    
  
  
  Personal_Submersibles mailing list
  Personal_Submersibles at psubs.org
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