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Hi Carsten.
When I wrote the below post I meant if they left
the interior chamber hatch open, not the outside one.
I said "if you left the diver lockout chamber door
open to the hull" I meant the interior chamber door that
opens to the hull interior, not the exterior hatch
going outside the lockout chamber to the sea. I meant that if you kept
the
exterior hatch closed and opened the interior
chamber lockout door that you use to enter the chamber from inside
the sub
and then opened the valve to flood the chamber
while its door was open this would flood the sub. Imagine going into the
lockout
chamber from inside the sub and flooding that
chamber without closing the interior chamber door off to the sub.
I just meant that if you left the INSIDE door to
your diver lockout chamber open and went to flood the open chamber it would
flood the sub
because you left the inside door open. Sorry if you
misunderstood me Carsten.
Of course! I was not thinking clearly. Mein kopf
vas nicht klar! Lol. I didn't think about how to get rid of the pressurized air
once you pressurized the sub from 1 atmosphere to ambient.
You couldn't just dump it outside could you? Being
ambient pressurized it wouldn't go out without a compressor like you said. So I
guess you could pressurize the interior to ambient but
it would have to stay that way until you reached
the surface or very close to the surface and then you could close the hatch and
be back to one atmosphere again. That wouldn't work for you
to stay down in the sub and decompress with after
scuba diving because you couldn't stay down and decompress because you would
have to surface the sub to become 1 atmosphere to decompress. Duh! (slapping
myself) That one totally slipped bye me.
Also as you said Carsten, if you had enough air to
make the sub interior pressurized to ambient you probably would have enough air
to blow the ballast tanks anyway and not need to become ambient.
Ah well. It was a nice idea, but
Carsten's knowledge and wisdom shows it to probably be an impracticle
one. Carsten, one thing I wonder
about is when the pressurized air from the diver lockout chamber gets
bled into the sub
doesn't this increase the pressure inside the sub
somewhat so it is not 1 atmosphere anymore?
Even if this was a small amount of air in relation
the sub's interior, what effect would this have upon body tissues over several
hours? If this were done multiple times with divers coming in and out, wouldn't
this eventually pressurize the hull and cause nitrogen buildup
in the crew's bodies? How could a crew decompress
from this since they couldn't expell the air without surfacing, (or having a
large compressor as you said) and they couldn't surface without decompressing?
They would be damned if they did and damned if they didn't!
Do you have any information on this Carsten?
I remember reading about a civil war era sub
(recently rediscovered) that the Union didn't want that went to the islands and
was used for pearling I believe. They had this problem. It had a diver lockout
and some of the pearl divers died because of the buildup of nitrogen
from pressure within the sub. I know you have to be carefull and
adhere to scuba dive tables with an ambient sub. I just wonder what happens when
you blow the water out of the diver lockout chamber and that air goes into the
interior of a 1 atmosphere sub?
Kindest Regards,
Bill Akins.
----- Original Message -----
Sent: Tuesday, April 26, 2005 4:58
PM
Subject: Re: [PSUBS-MAILIST] Converting
from 1 atmosphere to ambient for escape?
I forgot to mention. If you have the room for a diver lockout
CHAMBER,
you also have a built in flood/scuttle valve. If you left the
diver
lockout chamber door open to the hull and flooded the chamber,
you
flood the hull.
--- If I let the diver chamber outside hatch
open, this means that the
diver chamber ist allready under outside
pressure. And this means I can
not open the hatch into the sub - because
its open into the diver
chamber - and the outside pressure there will
prevent any opening.
The above is assuming you DON'T have a
chamber door safety switch which
made sure the chamber door was fully
closed and latched before the flood
valve could work, or you disable said
switch.
--- If the hatches have the right direction the pressure
differenz will
do then saftey job.
You can also make a small
1 atmosphere sub have a diver lockout (without
a chamber) by pressurizing
the interior to equal the outside pressure
and opening a lower hatch
to escape as in an ambient
sub.
--- As Karka
has.
Therebye changing your small 1 atmosphere sub into an
ambient sub for
either diveing purposes or escape.
---
Leaving you sub in emergency - means that the boat in 99% is
laying
on the ground badly damaged - a exit hatch in the bottom will
maybe not
help.
If you used this for diving purposes you could reenter the sub,
close
the lower hatch, then let off interior air pressure and change it
back
to a 1 atmosphere sub.
---- How get the air out ? Only
by diving closer to the surface ? Or by
a compressor ? A really big
compressor..
Small size interior space does not necessarily
preclude a diver lockout.
Just become ambient.
--- The
problem is the inside volume ! Imagine a inside Volume of 1000
Liter and a
10 atmosphere pressure outside..
you need at least 10000 Liter compressed
air in your storage.. if you
have this huge amout of storge air - you can
blow rhe ballast tanks
also..
I wonder if anyone has built a 1
atmosphere sub that converted to
ambient and back again? The neat
thing for diving with it would be you
could start offgassing the nitrogen
from your body as soon as
you converted the sub to 1 atmosphere
again
so you could stay underwater in the 1 atmosphere sub and
offgas, then
convert the sub to ambient and go out again. I wonder how hard
it would
be to install an internal bottom hatch on the Kitteridge
350
and pressurize it to ambient and back to 1 atmosphere again?
----
Calculate hw many storgae gas you need..
Just more
alternatives. I like this forum as a sounding board for raw
sub ideas
that we can tweak into workable ones. Some sub ideas might
need refinement,
more discussion, or wise deletion, but none
are
stupid.
Kindest Regards,
Bill Akins.
regards
Carsten
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