74 SWEETE)ND CONDENSED MILK CONDENSING 



heating surface and is operated properly, the drip ends of the 

 jacket and coils should discharge warm water only, and not free 

 steam. The jacket and coils should be free at the drip or dis- 

 charge ends so that all condensation water may be quickly and 

 continuously removed. This is necessary in order to make the 

 most economical use of the steam and to secure high efficiency 

 of evaporation. In order to guard against back pressure the 

 drips may be equipped with suitable check valves. 



Fig*. 20. Steam coils in Rogers pan 



Courtesy of C. E. Rogers 



Through the walls of the body of the pan also enters the 

 milk draw pipe. This pipe connects with the hot well and through 

 it the milk rushes into the pan. Immediately outside of the 

 pan the milk pipe should be equipped with a valve to regulate 

 the inflow. The size of the milk draw pipe and valve is governed 

 by the capacity of the pan ; usually two to three inches in di- 

 ameter. Inside of the pan the milk pipe should be turned down. 

 If this provision is not made, the milk shoots straight across the 



