. Electric traction and transmission engineering . Fig. 108. 270 TRACTION AND TRANSMISSION. 91. Boilers. — An essential element in a steam plant isthe boiler equipment, and its size and cost depend uponthe amount of steam which is to be supplied to the primemovers and to the auxiliaries. A typical form of boiler foruse in power stations is shown in Fig. no, wherein the waterto be heated circulates as the result of localized tempera-ture differences, moving to the right in the cylindrical. Fig. 109. drum at the top, and to the left in the water tubes^ which areenveloped in the hot gases resulti
. Electric traction and transmission engineering . Fig. 108. 270 TRACTION AND TRANSMISSION. 91. Boilers. — An essential element in a steam plant isthe boiler equipment, and its size and cost depend uponthe amount of steam which is to be supplied to the primemovers and to the auxiliaries. A typical form of boiler foruse in power stations is shown in Fig. no, wherein the waterto be heated circulates as the result of localized tempera-ture differences, moving to the right in the cylindrical. Fig. 109. drum at the top, and to the left in the water tubes^ which areenveloped in the hot gases resulting from the combustionof the fuel. These gases ultimately pass through thedamper-zoniroWed opening near the top of the right-handenclosing brick wall, and through a breeching to the chimneyor stack. Steam is generated and confined under pressurein the upper part of the drum, and is fed through the nozzleon top to a header, whence it is conducted direct to the primemover. The capacity of a boiler is rated in horsepower STEAM STATIONSc 271 and the builder^s rating is based upon a heating surface of10 to 12 square feet per horsepower. A boiler of onehorsepower capacity is considered to be capable of allowingan evaporation of pounds per hour of water at 212° steam at atmospheric pressure, and to have an over-load capacity of 33^ per cent. If the temperature, /, ofthe feed water be less than 212°, the steam be x part dry^or the steam be superheated // F., the delivery of
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