[PSUBS-MAILIST] conical port seal

[Marc de Piolenc via Personal_Submersibles]

I remember something about soil testing... I guess we'll have to do 
that, although there's no doubt in my mind that the soil conditions are 
almost perfect. Sandy, well-drained, yet self-supporting to considerable 
depths and with good support capabilities.

Best,
Marc

On 7/28/2016 10:36 AM, Brian Cox via Personal_Submersibles wrote:
> Hank,   Is there anyway you could put the o ring in the flange?  Also I
> seem to remember an o ring at the very edge of the viewport, with a
> slight 45 degree chamfer on the edge of the plexi glass, rather than a
> groove cut into the acrylic.  I wouldn't want to put a groove into the
> acrylic.
>
> Brian
>
> --- personal_submersibles at psubs.org wrote:
>
> From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
> To: Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> Subject: Re: [PSUBS-MAILIST] conical port seal
> Date: Thu, 28 Jul 2016 01:24:18 +0000 (UTC)
>
> Hi Sean,
> Yes I did email it-- it is actually a picture from the Stichiw book, and
> is considered an acceptable option.  I bet if I read it again I will
> find the spec for the seal.  Personally I like the idea of an o-ring in
> the port.  I always though that was bad, but I would sure prefer that.
>  Today I came across a  section in the Stachiw book showing a test
> sample port with a o-ring groove.  It said there was no cracking
> initiated from the groove because it was close to the high pressure face
> of the port.   Maybe I should chuck her up and machine a grove in it.
>  What do you think about an o-ring.
> Hank
>
>
>
> On Wednesday, July 27, 2016 7:07 PM, Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
> Did you email it? I don't see it.
> I'd be inclined to stick with the PVHO recommendations (or Stachiw's
> book) for sealing arrangements. I think there is some discussion of
> gasket hardness and thickness if using a bearing gasket. I don't recall
> offhand though. A conical frustum window will probably use an o-ring though.
> Sean
>
>
> On July 27, 2016 6:27:11 PM MDT, hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org> wrote:
>
>     Hi Sean,
>     Did my picture make it?
>     Hank
>
>
>     On Wednesday, July 27, 2016 3:41 PM, Sean T. Stevenson via
>     Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>
>     Hank - sorry, but a picture is worth a thousand words. Can you post
>     a sketch of your present arrangement?
>     Sean
>
>
>     On July 27, 2016 3:10:03 PM MDT, hank pronk via
>     Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>
>         Hi Sean,
>         I am trying decide the simplest way to create my low pressure
>         seal on my conical window.  I has a rubber gasket with silicone
>         originally.   I did that so when the acrylic compresses the
>         silicone will drag the gasket along for the ride.  I don't think
>         it will compress much because it so oversized for the depth.  I
>         am wondering now if a thicker softer gasket is better.  The
>         gasket would be compressed by the retaining ring.  If the
>         acrylic does compress, the gasket can expand to maintain the
>         seal in the event that the sub reaches the surface before the
>         acrylic has expanded.
>         Do you have a recommendation.
>         Thank you
>         Hank
>
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