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# Horse Power for Construction of Boilers

## pounds

HORSE POWER FOR CONSTRUCTION OF BOILERS The unit of horse-power as decided by the American Society of Mechanical Engineers is equal to 33,305 B. T. U. From the standard steam tables in treatises on Thermo-dynamics we find that 966 B. T. U. are required to evaporate one pound of water from and at 212° F. Therefore 1 II. P. is equal to the evaporation of 33,305/966=34-1/2 pounds of water from and at 212° F. This is also equal to the evaporation of 30 pounds of water, at 100° F. into steam at 70 pounds gauge pressure.

The first thing to do is to chose the type of boiler we are to use. Then we find how many pounds of steam are to be supplied per hour; this is found by multiplying the desired horse-power by 34-1/2 or multiplying the horse-power of the engine or engines by the steam consumption per horse-power per hour. This is known approximately for every type of engine.