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

[Philippe Robert via Personal_Submersibles]

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
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
> _______________________________________________
> Personal_Submersibles mailing list
> Personal_Submersibles at psubs.org
> http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.whoweb.com/pipermail/personal_submersibles/attachments/20200928/e737c086/attachment.html>