[PSUBS-MAILIST] hatch detail

[Alan James via Personal_Submersibles]

Thanks for the explanation Sean.I had a look at the ram frame strength issue in the G.L. rules, & they don't mention anythingspecific about their strength.I did have a technical advice contract with G.L., & through correspondence realized that there were some areas that were black & white & some areas that were grey. If it looked OK  & you could justify yourself then it would pass. Alan


      From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Friday, March 18, 2016 1:23 PM
 Subject: Re: [PSUBS-MAILIST] hatch detail
   
Sorry Alan, the detail was suppressed when I created the image. It isn't really a third groove, but rather just a bit of relief over most of that middle area so that there is positive clearance all the way around (no metal to metal contact). I can get away with this because the conical bearing area is predominately carrying the load.Sean


On March 17, 2016 1:42:08 PM MDT, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Hi Sean,you are not showing a third grove for the vacuum path!If you get a good metal to metal seal either side of the vacuum hole then youwon't be able to monitor any leak or seat th! e restof the o-ring, or is their agrove in the landing for this.Cheers Alan

     

 From: Sean T. Stevenson via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, March 17, 2016 5:29 PM
 Subject: [PSUBS-MAILIST] hatch detail
  
I sketched the double o-ring seal idea on one of my hat! ches,to
illustrate what I was getting at.  Image is attached.  The channel
through the pressure boundary would connect to a vacuum pump and
pressure transducer.

Sean


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