[PSUBS-MAILIST] Hull Calc: 78" spheres

Fri Jan 9 23:05:09 EST 2015

Hank,
What is EE?
Thanks,
Scott Waters

Sent from my U.S. Cellular® Smartphone

-------- Original message --------
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> 
Date:01/09/2015  9:55 PM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Hull Calc:  78" spheres 

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

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