Next message: Henry Quigley: "Re: T&T: Trawler versus motoryacht"
wrote:
> The build up of crud in the heat exchangers and so forth...
>
> Do you get more if you are running or sitting? Where does it come from?
>
> There are a few companies out there now that will flush your heat exchangers
> or you remove them and have them dipped.
>
> R. Lee
>
>
Running.
The heat exchanger has cold sea water on one side, hot engine antifreeze
solution on the other. The engine coolant is generally around 180
degrees. That's plenty hot to cause the minerals in the sea water to
precipitate out of solution and collect on the surfaces of the
exchanger. The same thing happens in a lot of other heat exchangers like
a domestic water heater, boilers, etc. All are affected by
precipitation, the effect which varies as the temperature and dissolved
solids increase. Since sea water has such a high mineral content, or
total dissolved solids, higher amounts of solids will come out of
solution as the temperature increases. As the solids build up on the
exchanger surfaces, the coating inhibits the transfer of heat,
eventually to the point that the exchanger can no longer keep ahead of
the load, and an overheating condition results.
The flushing uses acid or some other solution to dissolve those
deposits. They go back into solution & the surfaces are freed of the
insulating build up, restoring the exchanger to its full capacity.
Steve Sipe
Solo 4303 "Maerin"
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