34 
BULLETIN 747, U. S. DEPARTMENT OF AGEICULTF/EE. 
M^NHQLg 
INLET 
to the utilization of all the heat in the exhaust steam, or as much 
as can be used profitably in the factory. 
The importance of effectively insulating hot-water tanks and pip- 
ing is not appreciated by most dairymen. A good quality of heat 
insulation properly installed will pay for itself in fuel saved in from 
six months to a year. Xot only will the insulation prove to be a good 
investment from the standpoint of fuel saved, but it will maintain 
the water at higher 
temperature, thus 
preventing the possi- 
bility of the water 
freezing over night 
and bursting the 
tank. 
The water-heating 
and storage tank 
should be placed in 
the boiler or engine 
room, where the tem- 
perature of the sur- 
rounding air will as- 
sist in maintaining a 
high temperature in- 
side the tank. The 
tank should be used 
for a general supply 
of hot water for all 
purposes around the 
creamery, such as 
boiler feed, wash wa- 
ter, pasteurizing, etc. 
"When practicable it 
is advisable to place 
the tank high enough 
to allow the hot 
water to flow by 
gravity for washing floors, utensils, etc., but for pasteurizing it is 
necessary to install a circulating pump in the pipe line, preferably 
in the return line between the pasteurizer and the tank, so that a 
forced circulation of hot water will be maintained. It is also neces- 
sary to provide a boiler-feed pump, designed for handling hot water. 
as an injector will not handle satisfactorily water of high tempera- 
ture. 
Fig. 
S. — Vertical exhaust-steam 
tank. 
water heater and storage 
