Re: [PSUBS-MAILIST] diver lockout details

["Jacob Lauser" <sirius@riverstyx.com>]

Carsten,

I just wanted to tell you that I have not forgotten about a submersible.
Right now I am writing the grants for the project here at the University and
am trying to get a team together. How is your ship going? Thanks again...

- Jacob Lauser


----- Original Message -----
From: "Carsten Standfuß" <MerlinSub@t-online.de>
To: <personal_submersibles@psubs.org>
Sent: Saturday, February 16, 2002 3:06 PM
Subject: Re: [PSUBS-MAILIST] diver lockout details


> Hi Sean,
>
> http://www.prismnet.com/~moki/20020111.130903/X13.jpg
> shows the actual design.
>
> The diver chamber is in the bow area and dry. The will be flooded with
> compressed helium
> and oxygen while the boat is a anchor about 3 feet away from the bottom.
> If the inside gauge and the outside gauge shows the same pressure we
> open
> a small ballvale on the bottom-hatch so that the small cylinder below
> the hatch will be also
> blown dry. Than the bottom entry hatch (a bajonet lock) will be turn 20
> degree
> and open (spring loaded). If a diver jump out he stand with his feet on
> the seabottom and
> the other divers help him with his gear. Than he dive out. The
> waterlevel on the lower
> end on the cylinder increase with the volume of the diver which leave
> the boat. If three
> divers leave the chamber the cylinder exit channel is filled with water
> up
> to the highest point - short under the lock. So the boat is still under
> his bouancy.
>
> I keep the anchormast out of the concept and will anchor on a heavy
> weight of 200 Kg and
> a short but very oversizes chain on a winch. If the boat goes a little
> to light - some chain parts
> lift form the bottom and the boat gets backs to zero bouancy. If the
> boat goes to heavy some chain parts struck the bottom and the boat also
> gets on zero level.
>
> The gas pressure and mix is controlled by the diver and for security
> from inside the boat.
> The CO2 will be scrubbert inside the chamber.
>
> If the diver close the hatch the gas pressure inside the chamber will be
> lowered by a vale
> to a small medium pressure boiler tank - and from this tank an automatic
> pressure switch start
> the compressor to press the expensive gas back into the storage bottles.
>
> The diver chamber has two beds in the bow end and can be also use a crew
> cabin
> for two person during normal cruseing mode. Also some storage gasbottles
> are
> located here to reduce the space as much as possible to reduce the gas
> volume
> nessesary to flooded the chamber.
>
> In emergency case the gaspressure inside the chamber can also release
> into the rest
> of the submarine - to get help to the divers. But this higher gas
> pressure has to
> put back to the storage bottles or the outside before the boat can
> surface - The main
> tower hatch is no designed for overpressure.
>
> For chamber using under 45 meter deep we will use normal air from the
> ballast blow storage
> bottles instead of helium/oxygen.
>
> The divers needs heated suits.
>
> Wetness is a problem is this area - I have not a final choise how to
> handle this problem.
>
> The hatch on the top of the chamber is an emergency lock out - for the
> reason that the
> main sub is flooded and rested on the bottom with blocked bottom exit.
> The chamber is than
> the rescue chamber - and for the reason that the way via chamber
> transfer hatch inside
> the (flooded) submarine to the sail hatch is maybe to small for divers
> with deepsea
> rebreather on there neck - has the same design as the bottom bajonet
> lock
> and for cost reasons - will be added maybe later.
>
> The bottom bajonet hatch is made from stainless steel with a clear
> diameter of about
> 770 mm (30 inch) and a very expensive supply part. Will cost about the
> same as the material
> to build one complete Kittredge sub...
>
> Carsten
>
>
> "Sean T. Stevenson" schrieb:
> >
> > Perhaps this question is best directed at Carsten, as he has (I think)
already
> > designed one of these, but I am curious as to how the diver lockout
chamber
> > is plumbed.  Does any flooding occur, or is it dry?  What compression
rate
> > is used, and how is it regulated?  How is diver decompression
accomplished?
> >  Controlled by the diver or must have intervention from a sub occupant?
Manual
> > control?  Multiple gas capability?  What about the space utilization?
ie.
> > during transit when not using the lockout chamber, can the space serve
any
> > other purpose?  What about diver access?  What design considerations
went into
> > the entryway?
> >
> > I have some ideas on how I would address these issues, but I would like
to
> > hear from those who have seen it, done it and/or thought about it.
> >
> > -Sean
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