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Abstract

The condition of the metal of the boiler units of the modern steam-generating plant is affected by the condition of the water which is used as feed. Compared with typical figures of a few years ago, the working pressure and the degree of superheat of the steam have increased, in addition to the rate of evaporation resulting from improved methods of firing and combustion. These factors influence the effect of the water on the metal parts.

An examination is made of various feed water circuits and of the methods of treating and controlling the quality of the feed and boiler water. Various examples are given of the difficulties which can occur, due to incorrect treatment and control, both in respect of scale and corrosion troubles. The causes of such troubles and the means for overcoming them are also considered. Instances of failures of economizer, boiler, and superheater tubes are given, and additional reference is made to the causes and effect of caustic embrittlement of the metal of the boiler. By careful attention to definite rules for the correct treatment and control of feed and boiler water conditions, steam-generating plants will keep in satisfactory condition under the exacting influence of the high pressures, high superheats, and high ratings of the present day.

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The Care of Modern Steam-Generating Plant from the Water Side

Abstract

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