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Re: [PSUBS-MAILIST] Main ballast.
Chris,
First I have to say, I didn't design it but from
what I see in the over all design, and knowing the designer, I think the valving
was done this way for safety and simplicity. All other valves except these
vent valves are located within the hull.
Since each of these vent valves run from an
external tank to outside the hull, each valve would have two through hulls for
the piping. Better three, quarter turn through hulls, then six pipe
through hulls, more fittings and a still three valve stem seals inside the
hull.
The vents for the fore and aft soft MBT have to be
mounted at the top of the tanks in order to release the air above the
water. Since the MBT's top is the same height as the top of the hull, the
piping and valves had to be located at the height of the conning tower. It
would be cluttered to have these valves and their piping inside the conning
tower. On both K subs, the MBT vent valves are taken apart and altered
with long stems that screw right on to a special threaded replacement for the
packing nut that is welded in through the conning tower wall. It makes a
clean package and has double O-ring seals for added safety. Even if
the valves get sheared off, the stems have shoulders that prevent then from
blowing through to the inside.
The less holes in the hull the better.
----- Original Message -----
Sent: Wednesday, May 21, 2003 10:33
PM
Subject: Re: [PSUBS-MAILIST] Main
ballast.
Hey Dan,
Just wondering, what is the reason for mounting
the valves external to the hull on the K-350? Is it because it's easier
to put the actuating shafts in a thru-hull and run that through the hull to
the valve, rather than mount the valves inside the hull with the air
lines and air supply and run the air lines through the hull to the
MBT's? Or something else I missed?
Thanks,
Chris Nugent
"Dan H." <JMachine@adelphia.net>
wrote:
Pierre,
On
the K-350 the "hard ballast tank" is located under the hull. There is
a
shaft that runs through the hull with a flex coupling on it that is
directly
above a quarter turn valve on the sea water opening of the hard
ballast
tank. A quarter turn of this threw hull shaft turns the ball
valve
directly.
The "soft ballast tanks" are of fiberglass and are
located fore and aft.
They are opened to sea water all the time. The vent
air is controlled with
quarter turn ball valves located on the conning
tower. The valves are also
located external but are altered with special
long stems so they are
controlled from inside the conning tower. The
valves are connected to the
top of the tanks with tubing. The valves are
mounted high in the tower and
vent from the tops of the
tanks.
Hope this is what your looking for.
Dan H.
-----
Original Messa! ge -----
From: "pierre&marie"
To:
Sent: Wednesday, May 21, 2003 6:31
PM
Subject: [PSUBS-MAILIST] Main ballast.
> Hi
People!
>
> How do you "plug" the main ballast tank to adjust
buyoncy (man, that word
is
> killing me...)
>
> I'm
trying to figure a way to use a 5/3 pneumatic valve. It would be
easy
to
> use to adjust bouyancy. But, I can't have the plumbing
right at the
moment.
>
>
> Any advise? Somebody know
how it's done in a K-350?
>
> Thanks!
>
> Pierre
Poulin
> "At last the sun is
here!"
>
>
>
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