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

[Philippe Robert via Personal_Submersibles]

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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