DeLaval VMS 2008, Instruction Book

Page: 105 / 206

Operation
VMS cleaning
94897201.pdf 2007-12-18
remove.
One way to solve a too low temperature of
the return water may be to raise the start
temperature somewhat. Another may be to
insulate the piping of the system.
Optimal temperature of the pre-rinse water
is 35-45 °C. In this range, milk residues will
be rinsed out of the system. Temperatures
above 50 °C will, on the other hand, cause
the proteins in the milk to denaturate and
precipitate as deposits within the system.
Hot water supply
Make sure there is enough hot water to
clean all subsystems at the same time:
milking station(s), storage tanks, etc.
Bear in mind that some hot water will be lost
due to mixing it with the cold water in the
boiler(s). If the boiler(s) does not produce
enough hot water, a bigger boiler may be
needed.
Always consult your DeLaval service
engineer if you have questions water
temperature, detergents, water temperature,
water supply, etcetera.
Detergents and detergent
dosing
Alkaline dominant cleaning scheme
A phosphated, alkaline detergent such as
DeLaval Ultra can handle water hardness
up to 30 dH. If the hardness is higher than
this, water treatment is necessary.
The table below may serve as a guideline
for an alkaline dominant cleaning strategy.
Note that cleaning too often with acid
detergent will reduce the effectiveness of
the cleaning strategy since the acid
detergent, such as DeLaval Cidmax, is a
descaler and not intended to remove
proteins and fat. Omitting use of alkaline
detergent will therefore cause a build-up of
impurities within the system. As few as two
consecutive cleanings with acid detergent
instead of alkaline might make it necessary
to increase the dosing of the alkaline
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