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

[Philippe Robert via Personal_Submersibles]

Upgrade on adding view port too. But now I will follow Jon advice,  better
to do what I see on the plan.

Le lun. 28 sept. 2020 10 h 47 a.m., Philippe Robert <phelop at gmail.com> a
écrit :

> Ok.
>
> Le lun. 28 sept. 2020 10 h 38 a.m., Sean T. Stevenson via
> Personal_Submersibles <personal_submersibles at psubs.org> a écrit :
>
>> "Upgrade" is a problematic term. When I design seals, I typically do an
>> exhaustive evaluation to determine whether standard O-rings will work, and
>> if not, then I start looking at other options. For this application,
>> O-rings work well, and I am hard pressed to come up with any possible
>> justification to use something different.
>>
>> Sean
>>
>> -------- Original Message --------
>> On Sep. 28, 2020, 08:17, Philippe Robert via Personal_Submersibles <
>> personal_submersibles at psubs.org> wrote:
>>
>>
>> Thanks for the advice, my goal is to build my submarine safeste as
>> possible, but if I can upgrade sealing and design it will be great.
>>
>> Le dim. 27 sept. 2020 10 h 46 p.m., Sean T. Stevenson via
>> Personal_Submersibles <personal_submersibles at psubs.org> a écrit :
>>
>>> In fact, there's nothing inherently wrong with rectangular cross section
>>> seals, provided they are implemented in the same manner as O-ring seals
>>> with a captive groove, managed extrusion gap, designed gap fill and
>>> designed maximum squeeze of the seal. Absent those controls, a simple flat
>>> gasket presents not only a severe risk of extrusion, but can be subject to
>>> damage and consequent failure if maximum squeeze is not constrained. When
>>> properly designed, however, rectangular cross section seals can perform
>>> essentially as an O-ring seal with integral backup rings in terms of
>>> extrusion resistance.
>>>
>>> Standard O-ring seals have the advantage of having a massive body of
>>> performance data available, and a freely available comprehensive design
>>> resource in the Parker O-ring Guide (ORD5700). Seals with custom geometries
>>> will generally require independent design verification in the form of FE
>>> models and destructive testing.
>>>
>>> Sean
>>>
>>>
>>> -------- Original Message --------
>>> On Sep. 27, 2020, 18:10, 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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