Re: [PSUBS-MAILIST] mounting acrylic dome in fibreglass

[Jon Wallace <jonw@psubs.org>]

Hi Alan,

If by "...leaving a small portion of the flange on..." you are talking 
about a flange on the acrylic dome as a result of manufacturing, check 
your Stachiw book for the requirements necessary to use such a flange.  
If it doesn't meet certain specs, leaving it intact can weaken the dome 
when it is under pressure.

Jon


Alan James wrote:
> Hi guys,
> I'm building a small epoxy/fiberglass 1 atmosphere sub and are wanting 
> to embed an acrylic dome in a block of epoxy resin/fiberglass. The 
> dome and fiberglass ring will comprise my hatch. The dome is 25mm 
> thick and 500mm OD. I'm envisaging I will embed it half way into 
> a ring that is 50mm wide and 25mm high. The ring has a theoretical 
> crush depth of 4000ft(1,768psi) The dome (if it was cast wich its not) 
> would have a crush depth of 3233ft. I have the option of leaving a 
> small portion of the flange on to key it into the fibreglass. The 
> epoxy fibreglass is about 25% stronger than the acrylic. I'm designing 
> everything with a crush depth of 2000ft + but will be happy with a 
> 200ft operating depth.
> Any thoughts -reservations - comments would be appreciated.
> Thanks, regards Alan
>  
>  
>  




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