[PSUBS-MAILIST] K-250 side viewport and dome hatch.

[Alan via Personal_Submersibles]

Hi Philipe,
I don't know of any submersibles that don't use o-rings as the hatch sealing method.
I believe there is a danger of a flat rubber seal extruding inward under pressure.
Alan 


> On 28/09/2020, at 10:32 AM, Jon Wallace via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Follow the plans.  The sections you reference are all related to the pressure hull and should not be modified.
> 
> Jon
> 
> 
> On Sunday, September 27, 2020, 04:47:54 PM EDT, Philippe Robert via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> 
> Hi all,
> 
> I currently make the conning tower. I see on the internet some k-250 with front and side viewport in addition of the acrylics dome. Some of the viewport is close to the gusset and I assume that is not possible to do a 100% weld. Is it acceptable ? Is it ok to drill hole in the viewport to put retaining bolts ?  Second question, on the blueprint, the sealing option for the hatch on the conning tower is o'ring groove. Is it possible to make better sealing like flat rubber strip or something like that ?
> 
> Best regards,
> 
> Philippe
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