Patrick,
As the question is specific to an ambient dry sub which is
my design profile, I will answer you in that regard. Whereas a semi-dry or
open ambient has a direct connection to the outside ambient pressure, to
remain a truly dry ambient requires the use of check valves.
The pressure is equalized by a constant flow of air introduced into the
cabin which opens the check valves and dumps the overpressure outboard. The
outside ambient pressure does not directly impact the cabin as you noted.
There is a delay in compensation, which limits descent rate to design
structural capability.
To oversimplify the 1 atm vessel keeps the pressure out by the
brute force of it's designed structural integrity.
Joe
From: "Patrick" <pat_man_ta@hotmail.com>
Reply-To:
personal_submersibles@psubs.org
To:
<personal_submersibles@psubs.org>
Subject:
[PSUBS-MAILIST] Ambient / 1ATM Q?
Date: Thu, 19 Jan 2006
11:21:48 -0500
I am having some trouble wrapping my head
around HOW the outside pressure influences the inside pressure in
an ambient dry sub and how a 1ATM sub keeps the pressure
out. Could someone explain this to me?
-patrick