Steam power plants, their design and construction . STEAM POWER PLANTS. 155 too much air. Furthermore, the coal can be burned with abso-lutely no smoke. Supply of Boiler Water.—The amount of water used for steamboilers in large plants is of such a quantity that an abundant sup-ply of good water at low cost is a deciding factor in the selectionof a site for a power house. The cost of water from city mainsis usually such that it is desirable for large plants to go to someother source, as a river if one be available, artesian wells, determining upon a supply, investigation should be ma
Steam power plants, their design and construction . STEAM POWER PLANTS. 155 too much air. Furthermore, the coal can be burned with abso-lutely no smoke. Supply of Boiler Water.—The amount of water used for steamboilers in large plants is of such a quantity that an abundant sup-ply of good water at low cost is a deciding factor in the selectionof a site for a power house. The cost of water from city mainsis usually such that it is desirable for large plants to go to someother source, as a river if one be available, artesian wells, determining upon a supply, investigation should be made. Figure 64.—Coal Bunkers Designed by Sheaff & Jaasted. as to whether or not the water is suitable for boiler purposes, theopinion of a chemist, not a boiler-compound quack, being obtainedupon this point. Water may be unfit for boiler purposes withouttreatment on account of the presence of sewage which will causefoaming, or of certain salts which will form hard scale on theheating surface of the boilers and not only impair their efficiencybut also entail large expense for cleaning them and be a sourceof probable danger besides. Deep well waters frequently contain 156 STEAM POWER PLANTS. scale-forming salts and occasionally rivers receiving the rainfallfrom certain watersheds. River water is frequently contaminatedwith sewage. Sewage can probably be best removed for boilerpurposes by mechanical filtration; silt and mud by sedimentationand the same process. Water Softening.—The salts which give the most trouble insteam boiler waters by the formation of scale are the carbonatesand
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