Brent,
Thanks for thinking with
us. I don’t have time for such nice drawings.
We choose for welding cos
it is more simple to (FEM) calculate the stresses. Mind the VBT is loaded 10
bars over dive deep . that means 30 Bars and test at 40 !
Now I know what baffles
are ;-)
Emile
Van: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] Namens Brent Hartwig
Verzonden: maandag 9 februari 2009
21:28
Aan: PSUBSorg
Onderwerp: RE: [PSUBS-MAILIST]
Kreideseesub Annular VBT
Hey
Guys, Ya I would expect you would need a good amount of paint
to make sure is coated the inside on the inner steel tube section. I've
always worried about these type of areas made out of steel. It
seems like there could be a way one could also design a bolt on interior steel
tube section in at least two parts, top and bottom respectively. Then have a
soft large O-ring of gasket in a groove that is machined into the ring flange
that is welded to the flat rings that you have already welded to the
hull. I've thought about this type of set up for saddle ballast tanks and
the like. The side windows that area a section of a tube that are
installed on the hypersub are sealed in some manner. Perhaps just with
some Sekaflex Urethane sealant and the screwed on exterior edge tabs.
http://www.hyper-sub.com/prototype.gallery.php
It might be a little like the reverse of what was done on the S201's soft
saddle tanks, but designed to take the pressure of a VBT system.
http://www.msubs.com/Images/S201%20Images/S201%20-%203.jpg
http://www.msubs.com/Images/S201%20Images/S201%20-%201.jpg
Regards,
Szybowski
> Subject: RE: [PSUBS-MAILIST] Kreideseesub Annular VBT
> From: MerlinSub@t-online.de
> To: personal_submersibles@psubs.org
> Date: Mon, 9 Feb 2009 18:50:00 +0000
>
> Hi Brent, small corrections/additions:
>
> 20 Liters
(5 Galleons) of Zincreach primers must be in to reach also the inner shell of
the VBT.
>
> After turning the hull 360 degree we drain the paint out and paint the
hull with it.
>
> Its two components Epoxy. Later two layers of wo components Epoxy
multicoat and the same trick.
> (never do this with singel conponent paint..)
>
> And the tank must be grinded and clean before weld tight.
> After you close the welds all pipe openings has to close tempoary and the
tank will filed with weld gas - Agron or co2 until the paint will be filled in.
>
> Additionals:
> - Should be inspect via videoendoskop about all 4-5 years.
> - After saltwater dives the boat should do at least one freshwater dive
before went in store for longer.
> (Or fill up the tank onshore with freshwater and drain out.)
>
> "Be carfull on all details and the big thing may will survive"
(carsten)
>
> vbr Carsten
>
>
> "Emile van Essen" <emile@airesearch.nl> schrieb:
> > Brent ,
> >
> >
> >
> > The annular tank is great for saving space. Corrosion is a concern.
We apply
> > a coating in the tank by putting 2 litres of coating in and
turn the sub
> > around.
> >
> > That will hold 20 years. Then you have to make 3-4 inspection hatches
in..
> >
> > Horizontal weldment is a "slingerschot" don't know the
English name but it
> > is to get more stability with half filled tank.
> >
> >
> >
> > Regards, Emile
> >
> >
> >
> > _____
> >
> > Van: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org]
Namens Brent Hartwig
> > Verzonden: zondag 8 februari 2009 5:34
> > Aan: PSUBSorg
> > Onderwerp: [PSUBS-MAILIST] Kreideseesub Annular VBT
> >
> >
> >
> >
> >
> > Greetings Emile and Carsten,
> >
> > I've been meaning to ask you guys about the annular hard tank your
> > installing between two stiffener rings. Will it be just one tank or
have a
> > type of baffle arrangement? I see one horizontal weldment on the left
side
> > of the picture. Will you weld on the inner tube section that
completes the
> > tank, or bolt it on some how? I'm mostly thinking of how to deal with
> > corrosion in that tank. Have you made any drawings of that tank?
> >
> >
> > "inside view. note the hull is on its side. Later the space
between the
> > frames will be closed. Then we have a strong stiffener and annular
> > hardtank."
> >
> >
http://picasaweb.google.nl/submachine55/kreideseesub#5294570454569936818
> >
> >
> > Regards,
> > Szybowski
> >
> >
> >
> > No virus found in this incoming message.
> > Checked by AVG - www.avg.com
> > Version: 8.0.233 / Virus Database: 270.10.19/1938 - Release Date:
02/06/09
> > 17:28:00
> >
> >
> >
>
>
>
>
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