Re: [PSUBS-MAILIST] Conical bowdome seat

[vbra676539@aol.com]

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