[PSUBS-MAILIST] conical port seal

[Sean T. Stevenson via Personal_Submersibles]

I would not machine a groove in the conical face of the port. Instead, use the chamfer on the outer face, and squeeze a ring between that, the seat, and the retaining ring.

Sean


On July 27, 2016 7:24:18 PM MDT, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>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 youHank
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