38 



BULLETIX. HI, U. S. DEPARTMENT OF' AGRICULTURE. 



however, is admitted to the boiler at 200° F., there would be a sav- 

 ing of 13.61 per cent — that is, the quantity of coal consumed per 

 day would be reduced to 1,797 pounds. The saving in coal would be 

 therefore 283 pounds a day, or 43.86 tons a year. If the coal cost 

 $5 a ton delivered in the bunkers, the annual saving in fuel would be 



SACK PRESSURE 

 VALVE 



I. 



^MMmk^/^^mf^MM^^/y^ 





Fm. 10. — Connections for using exhaust steam in continuous pasteurizer. 



$219.30. Table 6 sIioavs the sums annually saved under various con- 

 ditions of feed- water temperature and cost of coal: 



Tabi,e 6. — Amounts annually saved by heating feed water to 200° F. from- 

 various initial temperatures with coal at stated prices per ton. (Asstinriny 

 a 'fO-hor&epoiver hoi In- working S 10 days of 8 hours and 6.5 pounds of coal 

 burned per horsepower hour.) 



Cost of eoal per ton C2,oon 

 pounds) in bunker. 



$2... 



$2.50 

 $3... 



$3.50 

 $4... 

 $4.50 

 85... 

 $5.50 

 $6... 

 $6.50 

 $7... 



Initial temperature of feed water. 



■10° F. 60° F. 80° F. 100° F. 120° F. 140° F. 160° F. ISO" F 



(78. 



97. 



11. 

 136. 



156. 

 175. 

 195. 



2 1 I . 

 234. 



25.1. 

 273. 



$68. 00 

 85. 00 

 102. 00 

 119.00 

 136.00 

 153. 00 

 170. (X) 

 187. 00 

 204.00 

 221.00 

 233. 00 



$54. 



68. 



62. 



95. 

 109. 

 123. 

 136. 



150. 

 164. 

 £77. 

 191. 



$47. 



59. 



71. 



82. 



94. 

 106. 

 lis. 

 130. 

 1 12. 

 154. 

 L65. 



$24. 60 

 30.75 

 36.90 

 43.05 

 49.20 

 55.35 

 01.50 

 67.65 

 73.80 

 79.95 

 80.10 



$12. 24 

 15. 30 

 18.36 

 21.42 

 24.48 

 27. .54 

 30.60 

 33.06 

 36.72 

 39.78 

 42.84 



