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Brent,
Gosh its nice to do some Brent bashing for a
change.
I was feeling sorry for the Chinaman.
I don't think that your seal design is in the same ball
park as the Seeker tragedy.
Worst case scenario, you'll get some drips on your
head.
Noted that after all the pontification about the Chinese
death trap that you were the only
person in the group safety conscious enough to forward the
sugestion of getting in contact
him.
Alan
----- Original Message -----
Sent: Tuesday, September 08, 2009 6:44
AM
Subject: RE: [PSUBS-MAILIST] No Machining
Hatch Sealing Concept
Hi Hugh, Well if
I can at least entertain, I've done some thing positive. Ya win some, ya
loose some as I like to say from time to time as I'm chasing deere
throught the woods. ;} In any case I think
the concept might at least work well for low pressure service in hyperbaric
chambers that are going to less the 30 psi. Getting those big plate
doors and there flanges is spendy.
My hatch plate and hatch land in
the concept are not machineded flat. You can have a bit warp in one or
both of them, and since I'm seating the upper sealing rings at first in
uncured urethane, you could still get a matching sealing surface. That was the
point of the design. The rings are just rolled for a few dollars are you
local metal supplier. No machining, just some grinding, sanding and welding.
Not perfect, but a propane tank persubbers dream.
Should we psubbers be
flustered if are postings get countered? I don't believe so. It's why I
post, personally. Should we expect a new, or some what new idea to be fully
figured out and proven functional, when it's first posted? I don't believe
so.
I very much enjoy a think tank
discustion from time to time. Doe's it need to be all worked out in less
then three days?
Regards,
Szybowski
From: hc.fulton@gmail.com
To: personal_submersibles@psubs.org
Subject:
RE: [PSUBS-MAILIST] No Machining Hatch Sealing Concept
Date: Tue, 8 Sep
2009 05:49:31 +1200
Hi
Brent,
You
have come up with some innovative ideas and it is great to explore them.
How are you making the flanges? From your drawings they look as though
they are machined flat with some nice chamfers etc. The new cutting
Rings you have made look as though they are machined or how would you make
them. It appears you are making a machined “non machined” hatch
design. Where are you going with this? I think you
deserve a prize for entertainment!! Looking forward to meeting you at
P-subs. Cheers, Hugh
From:
owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brent
Hartwig
Sent: 07 September 2009 23:23
To:
PSUBSorg
Subject: RE: [PSUBS-MAILIST] No Machining Hatch Sealing
Concept
Alec and Cody,
You might like this configuration better for keeping the urethane from parting
as easily. As you know, not all urethane is created equal. There is all manor
of poured gasket products to choose from. In this configuration I've
added a additional lower ring, between the others, and put larger weld beads
on the upper sealing rings.
http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/No%20Machining%20Hatch%20Sealing%20Concept%2055/Concept%2057
Regards,
Szybowski
From:
cody_mcmillan@hotmail.com
To: personal_submersibles@psubs.org
Subject:
RE: [PSUBS-MAILIST] No Machining Hatch Sealing Concept
Date: Fri, 4 Sep
2009 20:38:36 +0000
it is a very intresting idea, but as you get deeper
and the pressure increases those ridges that are seating on the flat gasket
are likely to just cut into it and fail. thats just what i think
anyways.
Cody McMillan
Marine
Engineer
6046573770
From:
brenthartwig@hotmail.com
Subject: [PSUBS-MAILIST] No Machining Hatch
Sealing Concept
Date: Fri, 4 Sep 2009 04:14:04 -0700
This is an idea
I've been wanting to make some CAD models and drawings of for some time now.
We have this big oval or rectangle steel plate doors for the hyperbaric
chambers, and it's expensive to machine the doors and seating flanges flat,
plus cut the O-ring groove. Even then the welded in door frame can and usually
warps some. Once welded in the door frame is very hard to machine.
The concept shown in the below pictures and drawings, is showing a K-350 type
hatch and hatch land, that have two rolled 1/4" SS rod rings, that are TIG
welded onto the hatch flange, and two on the hatch land. The two on the
hatch land are to form a dam for Sekaflex, that you caulk in there and level
off. Then to allow the upper SS rings to seat down into the Sekaflex
enough to take up any warp in both flanges and not stick to the Sekaflex while
it is curing, you apply mold release to the SS rings, and then spray them with
PVA mold release agent and let that dry. Then before the Sekaflex is
caulked into the lower rings, you lower the hatch and figure out what spacers
you need to keep if from going down to far into the urethane. Then add the
Sekaflex of the type of hardness you want, and lower the hatch, which is
attached at the hinge to keep every thing lined up, and set the hatch down on
your taped or clamped on spacers, and let it cure.
One could use
just one upper SS sealing ring as you can see in the drawing of a large WWII
ballast tank flapper valve. But I like the primary and secondary sealing
means, and it evens out the stresses more.
" Stand still. The trees ahead and bush beside you are not lost."
~ Albert Einstein
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