. Engineering practice and theory, for steam engineers ... . forced through an exhauststeam heater, entering it at no0 Fah. and leavingit at 1903 then no — 50 = 60 and 190 — 60 = 130heat units to be subtracted from the total ,212 — 130 = 1,082 heat units to evaporate eachpound. 134,800 -T- 1,082 == 124 pounds. There-fore under these conditions it would be the same asevaporating 19,124 pounds of water. These rules may be applied to any test by usingthe figures which correspond to the conditions underwhich the test is conducted, and by comparing theresults secured in different cases the co
. Engineering practice and theory, for steam engineers ... . forced through an exhauststeam heater, entering it at no0 Fah. and leavingit at 1903 then no — 50 = 60 and 190 — 60 = 130heat units to be subtracted from the total ,212 — 130 = 1,082 heat units to evaporate eachpound. 134,800 -T- 1,082 == 124 pounds. There-fore under these conditions it would be the same asevaporating 19,124 pounds of water. These rules may be applied to any test by usingthe figures which correspond to the conditions underwhich the test is conducted, and by comparing theresults secured in different cases the comparativeefficiency of any number of boilers may be deter-mined. The process of determining the amount of waterthat would be evaporated from and at 212° whenthe amount evaporated under actual conditions isgiven is called Finding the equivalent evapora-tion. If some other standard is adopted the reductionof actual results to this standard comes under thesame general head, but in such a case the preferredstandard must be clearlv stated. AND THEORY. 47. This water tube boiler has a horizontal steamdrum and inclined water tubes. Steam may beraised in it quickly from cold water, and it givesgood results in practice. A you are in charge of a plant where the con-ditions are unsatisfactory, and the pay is small,then is the time to qualify for a better situation. f^t^ f*v* irir «% r*r* rmrm 48 ENGINEERING PRACTICE. CHAPTER 6. ACTUAL HORSE POWER OF BOILERS. There are two standards for calculating the actualhorse power that a boiler is developing. The standard adopted by the American Societyof Mechanical Engineers calls for the evaporationof 344 pounds of water per hour, from feed at 2i2DFah. into steam at o pounds pressure. The standard adopted at the Centennial Exposi-tion at Philadelphia, Pa., in 1S76, is the evapora-tion of 30 pounds of water per hour, from feed at100D Fah. into steam at 70 pounds gage us compare them and note the difference. To ev
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