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Thanks Hugh & Jon for the vote of
confidance.
I did qualify this with " In an emergency
situation". I think I have been
misunderstood.
You take your sub down to its 250ft limit with
several extra dive tanks on board.
At this point the outside of your hull is
experiencing round 125psi.
For every 33ft further you go down you add 14.7psi.
The hull would always be experiencing
125psi from the outside as the pressure you're
adding would be countering the additional
pressure from additional depth.
So no pressure as such from the inside would be
pushing your view ports out.
The reason I said to increase the O2 flow into the
hull is the "bellows add" system based on
sensing a drop in pressure wouldn't work. In that
system the O2 flow is set below the users
normal O2 consumption & then topped up from the
bellows add system because if the O2
was set too high there would be a continual
pressure build up & 02 % increase.
You could safely bump up the O2 a tad as it would
be safer to have too much O2 than not
enough. This, as Jon said wouldn't matter much
because your time would be constrained by
decompression tables, & there would be enough
air in the hull to breath from.
So in a life or death emergency you could
take several air tanks into your hull & a set of
dive timetables, open the tanks by hand at the
250ft mark & go to 400ft.
Alan
----- Original Message -----
Sent: Sunday, July 04, 2010 11:23
AM
Subject: RE: [PSUBS-MAILIST] K250 to K400
modification
Alan,
That
would have to be the silliest idea you have come up with. Heard of
bends, decompression?
I am thinking that
it would be possible to turn a K250 or any
sub
into a semi-ambient
for an emergency situation where you needed
Example --- Go down
to your 250 ft limit & turn on an ambient
system
at that
point, this pressurizes the cabin as you progressively
descend.
Theoretically you
could go another 150ft, down to 400ft.
I guess you'd need
a lot of tanks for a K250. Maybe more practical
for
Cliffs sub wich is
a bit smaller. You would need a dive computer for
decompression
calculations, an over pressure valve, a modification
of
the life support
system wich could be as little as increasing the
O2
flow into the
cabin. Also the instrumentation would need to take
75psi.
The ambient
equalization system could be set up by having a outside
pressure reading
& an electronic system that fed air into the hull when
the outside
pressure was more than 125psi above the inside.
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