Re: [PSUBS-MAILIST] Hardregulatortank without pipeing

["D. Blake" <dblake@bright.net>]

I read your post a second time.  Now I see your point.  You want both tanks
completely disconnected from each other.  From an economic stand point, I
don't see the utility in this case.  A closed system seems more economical
and efficient.  No worrying about overcoming ambient pressures, and no crap
from the sea contaminating the tanks.  With a closed system, you could use
water for drinking in an emergency.  You really only need two (at the most)
pipes connecting the tanks to transfer ballast.  These along with the tanks
could be located outside the pressure hull.  Air to transfer the ballast,
and equalize the tank pressures could be controlled by solenoid valves, and
located outside the hull.  And yes, it would seem a very good way of knowing
the level of water in the tanks would be important.
BigDave
-----Original Message-----
From: Carsten Standfuß <MerlinSub@t-online.de>
To: personal_submersibles@psubs.org <personal_submersibles@psubs.org>
Date: Wednesday, February 21, 2001 1:58 PM
Subject: [PSUBS-MAILIST] Hardregulatortank without pipeing


>Hi submadmans - I just disscus a nice question with a friend and
>found that this stuff needs maybe some input from the group.
>
>Question :
>
>Hard Regulator tanks (bow and stern) outside the pressure hull
>(hard tank ) without water pipes for bouancy and trim adjusting.
>Is that possible ?
>
>Yes I tink this could be work. A air pipe on the top with a conection
>to a air pressure valve and just a hydraulic controled water in/out vale
>on the bottom. B-U-T (and this is a great but) to control this is not
>easy.
>You need a very acurate inside level indicator and a air pressure
>control.
>
>For example : boat on diving station. Amount of water in both tanks
>50 % and same air pressure in both tanks like outside.
>
>Say - the bow of the sub is just a little to heavy but the bouancy is
>just
>right. That means you have to put out say 10 % from the bow tank
>and you have to fill in 10 % in the stern tank.
>
>Before the water leaves the bow tank you have to increase the
>airpressure
>there. Then open short the bottom vale and as the indicator shows :  -10
>%
>close the bottom vale - seems not a great problem.
>In the sterntank you have let water in - so you must lower the air
>presssure here. Open the air vale on the top to exaust the air pressure
>and open the bottom vale - seems not a great problem ..
>
>But now the stern is - for example - just a little to heavy  - you have
>to increase the airpressure at the stern tank and to lower the pressure
>in the bow tank...
>
>Seems its needs some kind of more or less automatic airpressure
>control..
>to control bouancy and trim in two undependent tanks.
>
>Maybe I will looking forward to this kind of concept in CSSX.
>Its save all the strong seawater pressure pipes in the boat,
>all the big hull security vales, the trim pump..  - just small
>airpipes and two outside hydraulic-driven pressure-water-vales.
>
>Looking for any idear about the air control device..
>
>see you Carsten