[PSUBS-MAILIST] conical port seal

Thu Jul 28 08:03:37 EDT 2016

Sorry. My email client went insane and opened the wrong window when I 
was trying to reply to my architect. Had to reset it, but by that time 
the offending message had gone.

Marc

On 7/28/2016 7:34 PM, Alan James via Personal_Submersibles wrote:
> Thanks Marc,
> I will remember that if I decide to grow anything in my submarine.
> Alan
>
>
> ------------------------------------------------------------------------
> *From:* Marc de Piolenc via Personal_Submersibles
> <personal_submersibles at psubs.org>
> *To:* Personal Submersibles General Discussion
> <personal_submersibles at psubs.org>
> *Sent:* Thursday, July 28, 2016 10:29 PM
> *Subject:* Re: [PSUBS-MAILIST] conical port seal
>
> 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
> <mailto:personal_submersibles at psubs.org> wrote:
>>
>> From: hank pronk via Personal_Submersibles
> <personal_submersibles at psubs.org <mailto:personal_submersibles at psubs.org>>
>> To: Personal Submersibles General Discussion
>> <personal_submersibles at psubs.org <mailto: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
> <mailto: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
> <mailto: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
> <mailto: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
> <mailto: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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