A calcium carbonate compound. In Boilers, Calcite is formed by the thermal decomposition of calcium bicarbonate at high temperatures. It is found in feedwater heaters, feedwater pumps, feedwater lines, economizers and boilers. In Cooling Water, calcium carbonate compounds are the most common deposit found.Calcium carbonate will precipitate in the hottest location in the system (i.e., heat exchanger or chiller). High alkalinity favors the formation of Calcite over the other forms of calcium carbonate. Calcite is more stable than Monohydrocalcite and Aragonite, and the other forms will convert to Calcite over time.
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