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7
Technical Reference
7.7
Water quality
7.7
Water quality
Alfa Laval ref. 553406 Rev. 9
Operating water is used in the separator for
several different functions: e.g. to operate the
discharge mechanism, to lubricate and cool
mechanical seals.
Poor quality of the operating water may with
time cause erosion, corrosion and/or operating
problem in the separator and must therefore be
treated to meet certain demands.
The following requirements are of
fundamental importance
1.1 Turbidity free water, solids content <0,001%
by volume
Deposits must not be allowed to form in certain
areas in the separator
1.2 Max. particle size 50 µm
2 Total hardness less than 180 mg CaCO
3
per
litre, which corresponds to 10°dH or 12.5°E
Hard water may with time form deposits in
the operating mechanism. The precipitation
rate is accelerated with increased operating
temperature and low discharge frequency.
These effects become more severe the harder
the water is.
3 Chloride content max 100 ppm NaCl
(equivalent to 60 mg Cl/l)
Chloride ions contribute to corrosion on
the separator surface in contact with the
operating water, including the spindle.
Corrosion is a process that is accelerated
by increased separating temperature, low
pH, and high chloride ion concentration. A
chloride concentration above 60 mg/l is not
recommended.
4 pH>6 Increased acidity (lower pH) increases
the risk for corrosion; this is accelerated by
increased temperature and high chloride ion
content.
NOTE
Alfa Laval accepts no liability for consequences
arising from unsatisfactory purified operating water
supplied by the customer
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