8 BULLETIN 890, U. S. DEPARTMENT OF AGRICULTURE. 
Fig. 4. — Battery of clarifiers used at a large plant. 
SELECTION OF PASTEURIZING EQUIPMENT. 
A large number of different types and styles of pasteurizers are 
on the market, and one should know what requirements are to be 
fulfilled before attempting to select a machine. 
In general the type of pasteurizer selected should be adapted to the 
particular plant for which it is intended. A small plant will often 
require a different type of machine from a large one. A plant han- 
dling milk only may require a type different from that required by 
one handling by-products also. 
Other questions which have a bearing on the selection of a pas- 
teurizer are : Is the daily output constant ? Is the business increasing 
or constant ? The large dealer must have a machine that will handle 
a large volume of milk in a short time. 
Among the points to be considered in the selection of a pasteurizer 
are the following: 
1. Simplicity of the machine. 
2. Ease of cleaning. 
3. Ease of sterilizing. 
4. Economy of operation. 
5. Avoidance of high temperatures in the heating medium by having 
a large heating area. 
6. Accuracy of holding. 
