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RE: [PSUBS-MAILIST] New to PSUBS
Title: Message
How
about this.
1 atm
sub: A sealed can that is not affected by outside pressure.
Ambient: A can with on opening at the bottom that allows the surrounding
water pressure to affect the pressure in the cockpit.
Take a
tin can with a lid, submerge it in a swimming pool. If the pool is deep enough
the can will begin to crush. This is 1 ATM.
Take a
cup, turn it upside down and take it into the same pool, the cup will not crush,
but the air pocket in the cup will shrink more and more the deeper you take it.
This is ambient. To maintain dry ambient, you must add air in the appropriate
amounts to keep the water out.
Ron
In a message
dated 12/6/01 3:15:22 PM Eastern Standard Time, phil.willis@wanadoo.fr writes:
the design would have to be a dry ambient pressure vessel
This seems contradictory, unless I
misunderstand. A pressure vessel would be a 1 ATM sub. All of
these are dry. A dry ambient sub is not a pressure vessel.
Ambient subs can be wet, semi-dry, or dry. Ambient means the
occupant is always at ambient (surrounding) water pressure... which increases
with depth... like a scuba diver is. All scuba limitations apply.
The 1 ATM subs are all dry, and cabin pressure remains at (or near)
surface pressure of 14.7 psi (One Atmosphere) regardless of depth. I
think this is the design you're interested in.
In any case, you're in
the right place for advice.
Stan Freihofer
2 man Ambient Dry
Ft. Lauderdale