[PSUBS-MAILIST] Fw:

Sat Oct 24 11:46:34 EDT 2015

Sean,Great, I will do just that and make a template to find the worst spot.  I did communicate with EE regarding the importance of smooth sphericity.  The head sales guy asked for pictures and took them to Quality control guy.  Quality control guy says they can not eliminate that fold and it exists  until a thickness of 2 inches.  They do not offer a segmented head in that size range either.  If I was calling on behalf of Shell Oil, I suspect they would :-)   Head sales guy was polite but firm that the issue was dead.

     On Saturday, October 24, 2015 8:52 AM, Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 I would suggest characterising this exactly - do you have access to ultrasonic measurement? With the halves already welded, getting a caliper in might be tricky.Use a template to measure the out-of-round deviation in the worst possible plane. (Radius to match your design outer radius, subtending 120° of arc) If the radial distance between the template and the shell surface never exceeds 1/2 percent of the overall diameter at any point, then you're good to go. Just locate and measure the minimum shell thickness and use that measurement to determine the maximum allowable working depth.Looking forward, it's probably worth having a chat with someone at EE to explain why sphericity is critical, and seeing if they can accommodate you. They probably don't deal with many externally pressurised vessels, so e.g. additional press steps may be within their capabilities, but just not have occurred to them to do.Personally, I hate talking to people on the phone, so I create engineering drawings which are exhaustively toleranced, such that there is no way a supplied part could comply with the drawing and not be suitable. If a part doesn't meet the spec, I don't accept it.Sean

On October 24, 2015 7:11:09 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

| Sean,
I would say just out of round, very slightly.
Hank |

     From:  Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>; 
  To:  Personal Submersibles General Discussion <personal_submersibles at psubs.org>; 
  Subject:  Re: [PSUBS-MAILIST] Fw: 
  Sent:  Sat, Oct 24, 2015 12:54:54 PM 

| Is it thinning, or just out of round?Sean

On October 24, 2015 5:54:59 AM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi Emile ,I thought the fold line in the heads might be a Canadian fabrication trait, but after studying pictures of Nordic Sub, I see the exact same fold.  I assume you sourced your heads in Europe.  Did you increase the thickness to compensate, or is it a non issue. Thanks'Hank 

     On Friday, October 23, 2015 1:56 PM, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 James,I am planning a sphere sub with at least a 2,000 foot depth rating.  I am inspired by Scott's determination and I am pretty sure I can do it for a cost I can manage.I love the Pisces style occupant sphere with the conical ports.  I want to build it purely for the fun of it, with no time limit or practical  reason. Hank  

     On Friday, ! October23, 2015 6:53 AM, James Frankland via Personal_Submersibles<personal_submersibles at psubs.org> wrote:

 Picture made it, but its a bit of a tiddler.  However, I can see what you mean.  Its almost like a slight fold line.  From what you said I was thinking more of a crinkle.  It doesn't really look that bad, but then I suppose you want it to be perfect.  Whats the new project going to be?  
On 23 October 2015 at 13:37, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

If this picture makes it :-)   you can see two crease lines, the first one is about 4 inches above the weld line and the next one is about 8 inches above the weld line.Thanks'Hank

      On Friday, October 23, 2015 6:34 AM, hank pronk <hankpronk at live.ca> wrote:

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