. Railway mechanical engineer . practice. Perhaps the most notable example hasbeen in the treatment of Los .geles city water, where ananalysis showed the following content: Grains per gallon Total solids Organic and volatile Sodium chloride Sodium sulphate Calcium carbonate Magnesium carbonate TraceSilica—Free carbonic acids This water is very bad, forming hard scale in a short timeand it has been successfully treated Ijy the Ferrochem proc-ess for a number of years. As shown in the illustration the machine is simple in con-struction, consisting of three balls rota
. Railway mechanical engineer . practice. Perhaps the most notable example hasbeen in the treatment of Los .geles city water, where ananalysis showed the following content: Grains per gallon Total solids Organic and volatile Sodium chloride Sodium sulphate Calcium carbonate Magnesium carbonate TraceSilica—Free carbonic acids This water is very bad, forming hard scale in a short timeand it has been successfully treated Ijy the Ferrochem proc-ess for a number of years. As shown in the illustration the machine is simple in con-struction, consisting of three balls rotating in a circularraceway through which the water passes before going to theboiler. The balls are made of an alloy of pure metals, whichis readily abraded when the balls are whirled in the race-way by the action of the water. Fine particles of Ferrochemmetal then enter the boiler with the water and neutralizethe scale forming salts, both those in solution as well asthose in suspension. This prevents the salts from cementing. Apparatus for Ferrochem Water Treatment themselves together in the form of hard scale on the exposedsurfaces of the boiler. It is claimed that the introduction ofFerrochem metal into a boiler not only neutralizes all thesalts in incoming water, but softens and loosens the scalealready formed. The precipitation of the salts is in theform of a sludge or mud which does not harden and maybe readily blown or washed out. Among the advantages of a non-chemical method of feed-water treatment may be mentioned less danger of foaming,no decomposition of packing and gaskets, and exhaust steamthat is not contaminated by various chemicals. Also the non-chemical method just described has an addi-tional advantage in being automatic in action and requiringpractically no care. The success attending the use of the Ferrochem method in April. 1918 RAILWAY MECHANICAL ENGINEER 231 industrial plants raises the question as to its application tolocomotive feed-water problems and t
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadengineering
