Re: [PSUBS-MAILIST] how to fit the acrylic dome

Hi Andre, I was told by fabricator for my dome s that an oring under the flange of the dome will cause stress failure at the transistion of flange to dome. Recommended is a full width gasket under the entire flange for secondary sealing after the dome is under pressure and an outer oring at the exterior vertical edge or on top of the flange with the beauty retainer ring for low pressure.

Best Regards,
David Colombo

From: "André Eriksen" <a.erikse@gmail.com>
To: personal_submersibles@psubs.org
Sent: Fri, Jun 15, 2012 20:18:32 GMT+00:00
Subject: Re: [PSUBS-MAILIST] how to fit the acrylic dome

From what you said I made this sketch (attached). Is this a good way to fasten the dome?

-Andrè

2012/6/15 Emile <emile@airesearch.nl>

Hi Andre,

It is not done to drill / tap any holes in a acrylic dome. Stressraiser!

For shallow divers you can glue .

Under high pressures the dome contracts more than the ring

I use a o-ring on the edge and stainless steel bands hold down the dome.

Flange also possible for shallow divers. In the handbook of acrylics are some examples.

Emile

Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens André Eriksen
Verzonden: vrijdag 15 juni 2012 17:25
Aan: personal_submersibles@psubs.org
Onderwerp: [PSUBS-MAILIST] how to fit the acrylic dome

Hi,

I`m new to this forum, and are planning to build a 3 person sub.

I can`t seem to find any plans or pictures on how to fit the acrylic dome for the hatch. Is it screwed down on flanges with an o-ring underneath, or liquid gasket/glue? I`ve seen some domes without flanges, how do they attach them?

thank you.

-Andrè Eriksen, Norway