Re: Rochester status report, Jan 2, 2002

[Andrew Bennett <andrew.bennett@ns.sympatico.ca>]

On Thu, 03 Jan 2002 18:21:39 -0600, Tom Droege 
<tdroege@veriomail.com> wrote:

>I agree with Chris, don't try to parallel water systems.  A second pump 
>might be a cheaper solution.  But then you have more heat going into the 
>water if you get a submersible pump.  The CCD list has long discussions on 
>pumps.  They use a 12 volt pump designed to pump bilge water.

I'll second that one. I have just had to replace
the one I use to stir the noxious contents of my
sprayer after about five years of corrosive and
abrasive slurries. There wasn't much left of it
when it finally quit but that's 4 1/2 years more
than I hoped for when I bought it. Uses only a 
little over 1A. Tough beast.

>  I paid a lot 
>for the last pump I bought because I was tired of fussing with cheap 
>pumps.  You might try making the tubing size larger everywhere you 
>can.  There is a lot of pressure drop in the long tubes.

Right. The bilge pumps are intended to move a lot
of water but not against much of a head. Oops -
that's head as in pressure drop as opposed to head
as in camera head or the other kind.
>
>I think there is enough capacity in the 12 volt power supply to run a 
>pump.  But I would recommend an AC powered unit.  You could just run it 
>straight off the tap if there is a drain to get rid of the water.

The AC ones are usually nowhere near as efficient so 
there is more heat to get rid of.

Andrew Bennett, Avondale Vineyard