Railway and Locomotive Engineering . lt achievedthrough the application of fire brick arch,a high temperature superheater, feed waterheater and the locomotive booster. The brick arch and superheater may beapplied to the plain engine without in-creasing the size of the cylinders, al-though a better result is obtained if thecylinders are enlarged. When the feedwater heater is added the possible econ- 158 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1921 omy at relatively low speed can only beobtained with an enlarged cylinder. CurveD is based on an increase of one inch indiameter of the cylinder. ta
Railway and Locomotive Engineering . lt achievedthrough the application of fire brick arch,a high temperature superheater, feed waterheater and the locomotive booster. The brick arch and superheater may beapplied to the plain engine without in-creasing the size of the cylinders, al-though a better result is obtained if thecylinders are enlarged. When the feedwater heater is added the possible econ- 158 RAILWAY AND LOCOMOTIVE ENGINEERING June, 1921 omy at relatively low speed can only beobtained with an enlarged cylinder. CurveD is based on an increase of one inch indiameter of the cylinder. tained two others: One showing the com-bination of drawbar pull and speed con-verted into terms of drawbar horsepower,and shows the increase in horsepower ob- it should be borne in mind that thefuel rates shown are those whicli wouldobtain when the locomotive is deliveringits-rated power, and burning fuel at the \\ith a combination of all the factors tainable by a combination of the capacity r„te of from 120 to 130 pounds per square. 5 10 IS the total increase in capacity is greaterthan the sum of that obtained from theseparate devices. An examination of thesources of the economies will show thatthis is to be expected. The fire brickarch increases the evaporation and poweroutput by the economical consumption ofthe fuel; its field of operation is in thefirebox only. On the other hand, thesuperheater utilizes this increased evapor-ation by the prevention of cylinder con-densation and by increasing the volume ofthe steam at working pressure. The feedwater heater utilizes the heat in the ex-haust steam, which otherwise would bewasted, and the booster utilizes the poten-tial energy of the boiler at a time wlien thelocomotive cylinders cannot develop thefull boiler output, that is at starting andat a comparatively slow speed. It will beseen, therefore, that the economy of thefeed water heater is based not on the satu-rated engine, but on the increased volumeof steam produced by the a
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