T&T: Running or Sitting?

[Ownyacht at aol.com]

If one is running only in fresh water does it not build up? And, if one  
takes one's saltwater boat for an extended cruise in freshwater, say 2 or 3  
months, does the buildup go away?
 
 
In a message dated 3/1/2008 8:52:29 P.M. Eastern Standard Time,  
scsipe at comcast.net writes:

Ownyacht at aol.com 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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