What Measures are Usually Taken to Prevent Carry-over?
The most common measure is to maintain the concetratino of solids in the boiler water at reasonably low levels. Avoiding high water levels, excessive boiler loads, and sudden load chang-es also helps. Very often contaminated condensate returned to the boiler system causes carry-over problems. In these cases the condensate should be temporarily wasted until the source of contamination is found and eliminated. The use of chemical anti-foam agents can be very effective in preventing carry-over due to high concentrations of impurities in the boiler-water. Removing Impurities from Water : Coagulants are chemicals to enmesh fine particles of suspended matter in a water supply to form a floc which settles or can be filtered out. Adding softening chemicals (lime, soda, ash, etc.) to a water causes some dissolved hardness salts to precipitate and the suspended matter can then be coagulated and filtered out. Precipitation processes such as lime soda softening can effectively remove suspendedmatt
