[PSUBS-MAILIST] conical port seal

[Alan James via Personal_Submersibles]

Hank,I have a vague memory of either Emile or Carsten talkingabout ice forming in an o-ring groove & this caused the acrylicto crack. I could have this wrong so maybe Emile could commenthe is a bit of an expert with view ports now.Alan

      From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
 To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
 Sent: Thursday, July 28, 2016 1:24 PM
 Subject: Re: [PSUBS-MAILIST] conical port seal
   
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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