[PSUBS-MAILIST] hatch detail

[Sean T. Stevenson via Personal_Submersibles]

That seems to be the case with most of the rule sets, GL, ABS and ASME PVHO included. PVHO is particularly onerous - you can apply for an interpretation, but your question cannot be phrased as wanting an exception for a particular design variation, but must instead be a general question asking for clarification on an existing rule, if it fails to address a particular embodiment.

In my case, I am trying to design for simultaneous compliance with ABS, PVHO and Canadian vessel construction standards, and it's an exercise in frustration.

Sean


On March 19, 2016 2:23:54 AM MDT, Alan James via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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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