In boiler operation, the evaporation of steam leaves behind an increasing concentration of minerals in the water that become corrosive and/or scale producing. Corrosion leads to boiler tube failures, down time and very expensive repairs. Scaling of heat transfer surfaces decreases thermal efficiency and causes underdeposit corrosion. Shutdown for cleaning and boiler tube maintenance may become necessary. All of these consequences are difficult to deal with and costly to correct.
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