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RE: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
For me the spliced o-rings have worked fine, but whether I'd use one
would depend on the application. In the case of this penetrator
bulkhead, it's a completely static installation between closely machined
SS surfaces that are increasingly forced together with depth. In other
words, the o-ring is only there to ensure the initial seal at the
surface, but once you've dived those surfaces will seal even if there
were no o-ring at all. I would not use a spliced o-ring for something
more demanding, like say a shaft seal.
Thanks,
Alec
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Andy
Goldstein
Sent: Tuesday, February 24, 2009 13:26
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
Alec, or anyone who wants to answer,
Have you used spliced o-rings a lot? I've seen o-rings fail due to
sand, hairs, small nicks etc.
I'd be pretty nervous to trust a spliced one. But cant say I've ever
used or tested a spliced one.
I'd be interested to hear some field data on this.
-a
-----Original Message-----
From: owner-personal_submersibles@psubs.org on behalf of Smyth, Alec
Sent: Tue 2/24/2009 10:57 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
Go ahead Jon, no problem.
With respect to the o-ring, I just made my own using an o-ring kit from
MSC. The kit is nothing but an assortment of different diameter o-ring
cords, a razor, and superglue. The o-ring in Snoopy's penetrator
bulkhead has been there for 4 years now without incident. When I replace
it I'll see if I can find an appropriately sized off-the-shelf one, but
I'm afraid I don't have a standard size for it off the top of my head.
Brent, I did spot one minor apparent error on the first of the
renderings. It appears to show a weld between cover and seat that
doesn't belong.
A comment I would add with this on the site... I'd recommend installing
these only on endcaps, not on cylinders. The intersection of the seat
with a cylinder, even a big one like the main hull cylinder, is such
that the weld along that intersection pulls the seat out of a plane and
the plate won't seat evenly. I've installed two of them on the main hull
and had to re-machine the seats in place, which is an extremely nasty
job. I've installed another two in endcaps, and neither of those
distorted.
thanks,
Alec
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From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig
Sent: Monday, February 23, 2009 23:57
To: PSUBSorg
Subject: RE: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
Thanks Jon, I wouldn't mind, but you might have to twist Alecs arm a
bit. ;}
I need to add some clearance between the plate and it's seat in the
model and get with Alec to find out exactly what size of O-ring he used
and the exact gland size. Then I could add all the measurement's to the
drawings. You could start the page with the pictures you've already
seen. Since there are several plate thru hull designs out there, it
might be good to have them all grouped together some way.
Regards,
Szybowski
> Date: Mon, 23 Feb 2009 22:53:59 -0500
> From: jonw@psubs.org
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Alec's Plate Thru Hull Assembly
>
>
> Nice design by Alec and drawing by Brent. Any objection from either of
> you with putting this up on the website? I think we should find a
place
> on the website for some of these designs rather than have them get
lost
> in the mailing list.
>
> Jon
>
>
>
> Brent Hartwig wrote:
> >
> >
> > * Hello Subdudes, *
> > * *
> > * Alec was nice enough to send me a couple of his drawings of the
> > plate thru hulls on his subs. I worked up a 3D assembly model based
> > off his drawings and pictures. I think they are reasonable close to
> > what Alec has. I thought Alec's welded in ring was steel when I made
> > the CAD assembly, but both the plate and ring are 316 SS. *
> > * *
> > * So you guys can get a good idea of how they work, here are a
couple
> > pictures of the 3D assembly. *
> >
> >
http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Alec%7C4s%20Pl
ate%20Thru%20Hull%20Basic%20Configuration
> >
> > *
> > Regards, *
> > * Szybowski *
> >
> >
> >
>
>
>
>
>
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