A milk cooling tank, also known as a bulk tank or milk cooler, consists of an inner and an outer tank, both made of high quality stainless steel.
The space between the outer tank and the inner tank is isolated with polyurethane foam. In case of a paper of a power failure with an outside temperature pf 35.C the content of the tank will warm up only 2.C in 2hours.
To facilitate an adequate and rapid cooling of the entire content of a tank, every tank is equipped with at least one agitator. Stirring the milk ensures that all milk inside the tank is of the same temperature and that the milk stays homogeneous.
On top of every closed milk cooling tank is a manhole of about 40 centimeters diameter. This enables through cleaning and inspection of the inner tank is necessary. The manhole is covered by a lid and sealed watertight with a rubber ring. Also on top are small inlets. One is covered with an air-event, the others (s) can be used to pump milk into the tank.
A milk cooling tank usually stands on 4. The built in tilt of the inner tank ensures that even the last drop of milk will eventually flow to the outlet.
At the bottom, every milk cooling tank has a threaded outlet, usually including a valve. It consists temperature sensor.
Most tanks include an automatic cleaning system. Using hot and cold water, an acid and /or alkaline cleaning fluid, a pump and a spray lance will clean the inner tank, ensuring a hygienic inner environment each time the tank is emptied.
Control panel manages the cooling process by use of a thermostat. The user can turn the system on and off allow for extra and immediate stirring, start the cleaning routine, and reset the entire system in case of a failure.
New and bigger milk cooling tanks are being equipped with monitoring and alarm systems. These systems guard temperature of the milk inside the tank, check the functioning of the agitator, the cooling unit and temperature of the cleaning water. In case of malfunctions of any these functions, the alarm will activate. The monitoring system will also keep a record of the temperature and of all malfunctions for a given period.