Re: [PSUBS-MAILIST] Conical bowdome seat

[irox <irox@ix.netcom.com>]

Hi,

I also remember reading in the hand book that conical seated
view ports will rotate in the seat as pressure is increasing.
This might damage the gasket.

Cheers,
  Ian.


-----Original Message-----

From: vbra676539@aol.com

Sent: Jan 11, 2011 1:43 PM

To: personal_submersibles@psubs.org

Subject: Re: [PSUBS-MAILIST] Conical bowdome seat



Emile,
The conical seat requires a very precise fit. Properly fabricated, the o-ring manages the viewport seal very nicely. A gasket would have to carry tons of force, considering the square area on an arc segment viewport. All the calculations I have ever seen have to do with acrylic to metal.

Vance










-----Original Message-----

From: Emile van Essen <emile@airesearch.nl>

To: personal_submersibles <personal_submersibles@psubs.org>

Sent: Tue, Jan 11, 2011 10:33 am

Subject: [PSUBS-MAILIST] Conical bowdome seat



























Hi,



 



For the new bigger bowdome of eurosub we use a
conical seat



In my opinion is it a good idea to have a flat rubber
gasket between the acrylic and the metal .This for sealing and avoid stresses in
case of an imperfect surface .



 



In the “handbook of acrylics” this is
never mentioned. Why is this not done; too high surface pressure, sliding??



 



Hope you can help.



 



Regards, Emile



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