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

[Alan via Personal_Submersibles]

Thanks David,
I can remember ( before your time) a controversial Psub member from Idaho 
submitting a seal design that was a moulded rubber. He was told by Jay
Jeffries that it was dangerous & could extrude. This resulted in the only
real Psub Stoush that I can remember. ( Boring group really) And the said young member left the group! Jon will remember him fondly!
Alan




> On 28/09/2020, at 2:06 PM, David Colombo via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
> 
> Alan, on the VAST sub which has the original kitteridge dome, it has a  .5 inch wide flat rubber seal that appears to also have a seat groove into the hatch ring. The hatch is clamped with (4) internal dogs. The rubber seal protrudes about 3/16".
> David.
> 
> 
>> On Sun, Sep 27, 2020, 5:11 PM hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> Hi Philipe,
>> You have to machine the dome seat flat anyways, so adding an o-ring groove is a small extra step.
>> Hank 
>> 
>> On Sunday, September 27, 2020, 4:36:22 PM MDT, Alan via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
>> 
>> 
>> 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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>> 
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