Yeah…it would definitely be nerve
wracking. We better take along some light reading material for the wait. Greg Cottrell Project Manager http://www.precisionplastics.com P please consider the environment before printing this email From: owner- A vent
valve, perhaps? Just to let the air bubble out. Water from the flood valve
lower down would continue to equalize. It would be a nerve wracking wait,
though, wouldn't it? -----Original
Message----- Hi Vance, You’ve brought up an interesting point
about the release of air from a sub during egress. George Kittredge had a
similar experience of being “shot out” of a sub (although his sub was full of
over pressurized air). I wonder if it might be a good idea to put a flood valve
in the hatch to flood a sub completely before getting out? Greg Cottrell Project Manager P please
consider the environment before printing this email From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of vbra676539@aol.com Alan, I must be missing something here. What is
the last 15% of the volume in a flooding scenario? I've never had to do it, but
flooding the boat equalizes pressure inside and out. The volume of air
compresses in a One caveat about air in the boat that I
do know about is the violence of that bubble's release when the hatch is
opened. In the Nekton Beta accident, the bubble shot Rick Slater out of the
boat like a cork out of a champagne bottle, and the sudden movement of water
flooding in to replace that air is probably what caused the other passenger to
bang his head, which either caused directly or contributed to his drowning at
depth. Based on that, it seems that a larger bubble might very well cause
proportionally larger problems. Mind you, flooding the boat is a pretty
big problem all by itself. It gives me the shivers just thinking about it. Vance -----Original
Message----- Alan I would not use air
to equalize in an emergency. I would simply open my flood valve and let the
incoming water do the job. This would allow time to equalize your ears and such. And the
volume of air exploding from the tower is much less violent. Personally I prefer to
have full pressure to the hull and regulate it inside. In all scenarios I can think of, a high
flow is not needed. Filling tanks and such, a slow fill seems to be much more controllable. Dean In a message dated 8/19/2010 6:52:01 P.M.
Central Daylight Time, alanjames@xtra.co.nz
writes:
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