104 Chapter 4
with a volumetric meter and an air eliminat-
ing device is located at the back end of the
tanker. After the tanker pulls up to the milk
shed, the driver attaches a sanitary hose to the
farm milk storage tank and pumps the milk
into the milk transport tanker (Figure 4.2 ).
When the farm bulk tank is empty the pump
is turned off to prevent air from mixing with
milk in the tanker. The presence of air can
cause foaming and churning of milk. The
tanker arrives at the dairy factory after it
has collected milk from several farms and
is full.grade of milk (Grade A), milk must be cooled
to below 4 ° C (40 ° F) within time limits, for
example, 2 hours post milking.
The tanker driver obtains a sample for
milk from each farm at the time of collection.
This sample is the basis for quality determi-
nation and for payment based on milk
composition.
The tanker itself is made of sanitary stain-
less steel and fi tted with baffl es to prevent
milk from being vigorously shaken during
transportation, thus avoiding the possibility
of churning the cream into butter. A pump
Figure 4.1. Milk from the cow is measured in line and then sent to a bulk cooling tank. Reproduced with
permission from Tetra Pak.
Figure 4.2. Collection of milk on the farm. The tanker pumps milk from the farm bulk milk tank for transport
to the dairy factory. Reproduced with permission from Tetra Pak.