Thats my view as well Kurt. Some foks have no clkue as to other
materials out there. Even though a lot of stainless may appear to rust
its nothing but residual ferrous oxide thats on it since it wa not
chemically cleaned after it was cut, drilled sheared , welded or
fabricated as athe design specs did not callfor it, so the transfer of
regular carbon steel on the stainless starts to rush and it makes
folks think the stainless is rusting up., there is quite a varied
amount of alloys. I had a boat I kkept in sal****er for years and it
had a stainless steel prop, yet the only places yu ever seen rust was
in and on the area the wrench hit if I removed the prop. None anywhere
else. I have a pump running with a stainless steel shaft that I made
for it after the ceramic shaft broke, and thats been for 5 years or
more now and its just fine......

The surpluscenter.com which is a surplus for manufact over runs and
obsolkete stuff had chillers that was used to make desk top soda
fountains and provide chilled down drinks. They had chiller / refer
units without the propreietart parts like covers and dispenser nozzles
etc for sale for under $30 each. They all hade working refrigeration
units. The sump area that got chilled was polypropylene. It is
capable ot getting the intended soft drinks down to a temp of 50
degrees if yu set the temp dial low enough. I made a coil assembly up
which pulled SW from a tank and circulated it into the polyprop
resivoir and back into the DT. It worked and worked fine. I had
originally used just the polyprop resivoir to chill the DT water down
and it worked too, but I played since I liked to tinker and used a
coil I made up (foolishily out of Titanium when SS would have done)
and submerged it in the resivoir to be cooled by a mix of RODI water.
I was able to maintain a in out temp difference of close to 22 deg
with that setup and I really did not experiment allthat long with it
or maybe it could have been made to do more but that differential was
enough to chill main DT down to reasonable levels. I sold that home
brew chiller when I went PICO / NANO sized...now I am sort of
migrating back to larger, so I may need to check and see if they
have any of those hciller units left yet.

On Wed, 13 Dec 2006 15:11:28 -0500, KurtG
wrote:

William Marsh wrote:
Hi Kurt for one thing the Evaporator in the chiller is Titanium, a very
expensive metal. My 6ft light system was over $1,000 and the light bill
doubled but the tank looks great and ever is growing , Bill

I like to tinker, so I think I'll just start building my own as time
permits.

btw, I'm sure titanium works great, but is it necessary? High grade
stainless won't corrode for years, it's cheaper, and much easier to work
with (titanium is brittle). At least, my tack on my sailboat doesn't
corrode and it's been on the beach for 4+ years. They also use it for
knee replacements that are good for 20+ years.

--Kurt



-------
I forgot more about ponds and koi than I'll ever know!