February, '13] 



DEAN: HEAT FOR MILL INSECTS 



43 



TABLE SHOWING THE RADIATING SURFACE PER LINEAR FOOT. AND THE LINEAR FEET OF 

 PIPE REQUIRED TO MAKE ONE SQUARE FOOT OF RADIATING SURFACE 



In case steam pipe is used for the radiation, either one and one- 

 fourth or one and one-half inch pipe is recommended as the most 

 practical size. 



Some Very Important Points to be Considered in the Success- 

 ful Heating of a Mill 



1. The steam pipes should be located near the floor and so arranged 

 as to give an equal distribution of heat. 



2. There should be a water trap to draw off all water accumulating 

 in the pipes. 



3. The lower floors and the floors with heavy machinery should 

 have more radiating surface in proportion to the cubic feet of space 

 to be heated than the upper floors and the floors with the light 

 machinery. 



4. The steam should be turned on with 25-50 pounds pressure, so 

 as to heat the mill more rapidly. 



5. In order to take advantage of the heat in the machinery, the 

 heat should be turned on immediately after shutting down the mill. 



6. Stairways and elevator shafts should be closed, so as to make 

 each floor entirely separate. 



7. Two or three thermometers should be distributed on each floor 

 in order to know what temperatures you have. 



8. Time must be taken to reach the desired temperature. 



9. A temperature of from 118° to 125° is sufficient for any part of the 

 mill. 



10. This temperature should be held several hours to allow the heat 

 to penetrate all the infested parts. 



11. Do not attempt to heat a mill on a windy, a cold, or a rainy day. 



The Effect of Heat Fumigation Upon Flour 



In connection with heat fumigation, the question naturally arises 

 as to whether the heat would have any deleterious effect upon the 

 baking quality of the flour. To give data upon this subject baking 

 tests were made of a patent hard-wheat flour, a low grade hard-wheat 



