NewZealanders don't have an accent, everyone else
does.
Alan
----- Original Message -----
Sent: Saturday, March 03, 2012 12:01
PM
Subject: Re: [PSUBS-MAILIST] Hard ballast
inside P. hull
Hugh, Are you saying that you could use an existing pump in cast
iron to use a model to duplicate in bronze ?
I remember meeting you in Vancouver but I didn't detect a New Zealand
accent, are you not originally from there?
Brian
On Fri, Mar 2, 2012 at 12:52 PM, Hugh Fulton <hc.fulton@gmail.com>
wrote:
Any
chance of getting one at a decent price. I could make some in Bronze
or ali if there are any people interested.
Hugh
This Hypro pump is cast iron, talked to the manufacturer
and they would not recommend it for salt water. Would be the perfect
pump except for that.
On Thu, Mar 1, 2012 at 3:00 PM, ojaivalleybeefarm @dslextreme.com <ojaivalleybeefarm@dslextreme.com>
wrote:
On Thu, Mar 1, 2012 at 1:18 PM, Hugh Fulton <hc.fulton@gmail.com>
wrote:
Cant
find the radial, Vance. Can you give me a steer. Thks,
Hugh
Just the pump. That's a crankshaft driven in-line pump.
They also make a cam driven radial style. Four opposed pistons in an X
configuration that takes up less space and is
lighter.
You mean like one of these?
On Wed, Feb 29, 2012 at 1:47 PM, Vance Bradley <Vbra676539@aol.com>
wrote:
Look at car wash pumps. They are usually positive
displacement piston pumps designed for hard use. Available from about 25
psi on up to 1000 without going into specialty
units.
Brian,
If
you can find something off the shelf then I would love to know.
Saltwater, pump, 250 psi, 10 gpm. Not easy to find but I am in
NZ. USA should be much easier to find something. Does
anyone else have any experience with this???
Hugh
Ok,
I agree, it just seemed like you had to do a lot of modification to your
pumps. Is there nothing off the shelf that would do the job?
Do you have some good sources for those pumps?
On Wed, Feb 29, 2012 at 11:49 AM, Hugh Fulton <hc.fulton@gmail.com> wrote:
Vance
would know more about how common it is but fighting for space inside is
a common thing. Moving the water with air pressure is fine but
what do you do with the exhaust air as to get rid of it would mean
fighting against outside water pressure or compressing it inside the
transferee tank.
I
believe it is better to have access outside as then you can compensate
for different weight of passengers and also compression of the
vessels, difference in temperatures, fresh to salt water options
etc. Easier to use a manual bilge pump to transfer if you are
having it inside and then air into one tank equals air out. I am
following the Comsub HBT system with the motorized pump and 2 tanks with
a relief valve on each tank so if the pump fails I can blow with air to
remove the water against the relief. My penny’s worth.
Hugh
I'm thinking of having my hard ballast located inside my pressure hull
and controlling it's contents with air pressure. So I guess it
will have to be rated equal to my pressure hull. One reason for
doing this is simply for logistics as far as how my sub is laid out and
how I have to locate things. I could change this in the future to
have the hard ballast outside if I can find a good place for
it..
I was toying around with the idea of having
fore and aft trim tanks using hydraulic fluid as the medium for
transferring weight fore and aft. That way I wouldn't have to
worry about corrosion in the pump, even though the oil would not have
the weight of water.
Is locating a hard ballast inside the pressure
hull a common thing to do?
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