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[PSUBS-MAILIST] ballast valve
- To: personal_submersibles@psubs.org
- Subject: [PSUBS-MAILIST] ballast valve
- From: SIMON WALKDEN <mrsym0r@gmail.com>
- Date: Sun, 3 Jul 2005 08:39:46 +1200
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- Reply-to: personal_submersibles@psubs.org
- Sender: owner-personal_submersibles@psubs.org
Hi again,
I've been thinking about how a simple valve could be used to vent a
ballast, and i'm a bit stuck for ideas. The way I understand it is
this:
WHEN OPEN FOR FLOODING : a vent opens on the bottom side to allow
water in, a vent opens on the top to allow escaping air out, and
ballast air is not pumped in.
WHEN IN NORMAL STATE (NOT FLOODING OR EMPTYING) : the top and bottom
vents are closed, ballast air is not being pumped in.
WHEN EMPTYING BALLAST : a vent opens on the bottom to allow escaping
water out, the top vent remains closed, ballast air is pumped in to
push the water out.
So, you've got two vents that need to be opened and closed, and
compressed air that will at times need to be released into the ballast
tanks.
In this example, I've not used the K-250/K-350 design of an open
ballast tank, as I've read in several people's posts that they've been
a bit unimpressed with their ballast tanks 'burping' when travelling
on the surface.
Has anybody had any thoughts about this in the past?
-Simon
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