Condensed Milk and Milk Powder 



53 



spray pipe free from obstructions. It is advisable to install conden- 

 sers equipped with a manhole on top or at the end, otherwise access 

 to the spray pipe is not sufficiently convenient to insure frequent 

 inspection and thorough cleaning by the average operator. 



The Expansion Tank, Catch-all, or Milk Trap.— This is a tank, 

 frequently installed between the dome of the pan and the conden- 

 ser. Its purpose is to collect and reclaim any milk that may be car- 

 ried over from the pan and to prevent its escape and loss through 

 the condenser. 



If the pipe through which the milk enters the pan is turned 

 down and its end is carried to near the bottom of the pan, so as to 



avoid the formation of excessive 

 milk spray, if the pan is operated 

 carefully and if the milk is kept at 

 a reasonably low level, there is very 

 little danger of milk being carried 

 over into the condenser in quantities 

 sufficient to be of any consequence. 

 Under these conditions the installa- 

 tion of a special milk trap between 

 the pan and the condenser, for the 

 purpose of collecting the escaping 

 milk spray and carrying it back to 

 rig. 17" vacuum pan with milk the pan, is therefore an unnecessary 



trap and barometric condenser 



Courtesy of Arthur Harris & Co. ex P en SC 



If the pan is small in comparison to the amount of milk to be 

 condensed, and if it is forced beyond its intended capacity, so that 

 the milk boils up high, there usually is considerable loss of milk, as 

 indicated by the foaminess and milky color of the exhaust of the 

 vacuum pump. In such cases the mechanical loss of an average 

 size batch, may amount to several hundred pounds of milk. In 

 order to not lose this milk, a milk-trap or catch-all may be installed 

 between the pan and the condenser. The vapors loaded with the 

 milk spray enter the trap near the top. The spray drops to the bot- 

 tom of the trap, while the vapors are drawn over into the condenser, 

 where they are condensed as usual. This trap may be constructed 

 of sufficient size so as to serve as a reservoir to collect all the milk 

 that is carried over, and at the conclusion of the process, the con- 



