THE COST OF PASTEURIZING MILK AND CREAM. 3 



No account was taken of the cooling below the temperature of the milk 

 in the receiving vat, as this had nothing to do with the pasteurizing 

 cycle. 



Based on the foregoing data and assumptions the following calcu- 

 lations are made : 



Table 1. — Results of tests at five milk-pasteurizing plants. 

 HEATING. 



Time of operation hours. . 



Amount of milk pasteurized pounds.. 



Amount of steam used in the pasteurizer, 



pounds 



Heat in the steam supplied direct from 



the boiler to pasteurizer B.t.u.. 



Heat in the steam required to drive the 



pasteurizing equipment B.t.u.. 



Total heat supplied by boiler for pas- 

 teurizing B. t. u.. 



Heat absorbed in the pasteurizer . .do 



Total boiler horsepower developed for 



pasteurizing B. H. P.. 



Boiler horsepower per hour developed 



for pasteurizing B. H. P.. 



Total heater horsepower consumed in 



pasteurizing B. H. P.. 



Heater horsepower per hour consumed 



in pasteurizing B. H. P.. 



Milk pasteurized per boiler horsepower, 



pounds 



Milk pasteurized per heater horsepower, 



pounds 



Coal consumed for pasteurizing, pounds. . 

 Milk pasteurized per pound of coal, do 



Plant number. 



40, 



2, 



2,601, 



1,006, 



3, 607, 

 2, 258, 



4.366 



577 



258 

 595 

 259 



854 

 .000 



108.3 

 24.8 

 67.8 

 15.6 



375 



598 



578 



70 



3.216 

 20, 236 



1,383 



1,593,405 



444, 704 



2,038,109 

 1,383,000 



61.2 



19.0 



41.5 



12.9 



330 



487 



326 



62 



305, 



276, 



582, 

 263, 



2.0 

 628 



263.5 



499 



519 



018 

 .500 



17.5 



8.75 



7.9 



3.9 



435 



965 

 93 



82 



4.0 

 29,799 



1,128 



1,299,542 



921,664 



2,221,206 

 1,128,000 



66.7 



16.7 



33.9 



8.5 



446 



879 



355 



84 



3.6 

 22,055 



572.7 



659,796 



829,439 



1,489,235 

 572,700 



44.7 



12.4 



17.2 



4.8 



493 



1,282 

 238 



COOLING. 



Cooling water required in water section 



of cooler cubic feet. . 



Refrigeration extracted by brine.. tons.. 



1,697 



960 



.46 



.206 



317 



1.701 



COSTS. 



Capital invested in pasteurizing equip- 

 ment (pasteurizers, vats, coalers, etc.) . . 

 Interest per day on investment at 6 



$5,332.00 



.876 



3.652 



1,000.00 



.164 



.274 

 3.500 

 1.032 



.848 

 .480 



$3,000.00 

 .493 

 2.055 



800.00 



.131 



,219 

 1.750 



.582 



,480 

 .460 



$2,065.00 

 .339 

 1.414 



300.00 



.049 



.082 

 1.500 

 .166 



.109 

 .206 



$3,470.00 

 .570 

 2.380 



500.00 



.087 



.137 



3.000 



.634 



.158 

 1.700 



$6,250.00 

 1.027 



Depreciation and repairs per day at 



4.281 



Capital invested in mechanical equip- 

 ment used for pasteurizing (engine, 



700.00 



Interest per day on investment at 6 



.115 



Depreciation and repairs per day at 

 10 per cent per annum 



.192 



Labor, for pasteurizing 



3.000 



Cost of coal at $4 per ton (2,240 pounds) . . 



Cost of cooling water at 50 cents per 1 ,000 



cubic feet 



.425 

 .009 





.886 







Cost of pasteurizing daily supply of 

 milk 



10. 826 

 . .00229 

 . 00313 



6.170 

 . 00262 



3.865 

 .00430 



8.666 

 . 00251 



9.935 



Cost of pasteurizing one gallon of 



.80387 



Average cost for the five plants of 

 pasteurizing 1 gallon of milk 













