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Boiler water treatmentThere are two approaches to removing impurities in steam generating systems: external and internal water treatment. External treatment (also called pretreatment) refers to any process used to improve water quality before it enters the boiler. A sound approach to boiler operation is to use pretreatment in conjunction with a well planned internal chemical treatment program. That's because boiler feedwater, regardless of the type and extent of external treatment, may still contain impurities. Other contaminants may originate from pretreatment system upsets or process contamination in returned condensate. Even a small amount of impurities in boiler feedwater can eventually accumulate in the boiler to dangerously high levels, due to the effect of "cycling". Therefore, the accepted practice is to use some type of internal chemical treatment. As in most water-handling systems, the problems associated with deposit formation and corrosion are so closely related that both must be effectively controlled in order to achieve satisfactory results. In deciding on the treatment to be used, the entire system must be considered since all parts of the steam/water system are interrelated.
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