Alfa Laval MMPX 303SGP-11, Руководство пользователя

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8.4 Water quality
Alfa Laval ref. 553406 rev. 3
Specific requirements regarding the quality of water
Water is used in the separator for several different functions: Discharge-
mechanisms, liquid seals, as cooling media and for flushing.
Bad quality of the water can with time cause erosion, corrosion and/or
operating problems 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% of volume.
Deposits must not be allowed to form in certain areas in the
separator.
1.2 Max particle size 50 m.
2. Total hardness
≤
180 mg CaCo
3
per litre.
Chalk deposits can build-up if the water is hard (corresponds to
10 °dH or 12,5 °E). Increased operating temperature accelerates the
chalk built-ups.
3. Chloride content
≤
100 ppm NaCl (equivalent to 60mg Cl/l).
Chloride ions contribute to corrosion on the separator surfaces 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
Increasing acidity (lower pH) increases corrosion; this is accelerated
by increased temperatures and high chloride ion content.
For test methods, contact any Alfa Laval representative.
If these demands cannot be met, the water should be pretreated
according to Alfa Laval's recommendations.
Alfa Laval accepts no liability for consequences arising from
unsatisfactorily purified water supplied by the customer.
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