Alfa Laval S 821 - Demand Specification Water

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8 TECHNICAL REFERENCE 8.5 DEMAND SPECIFICATION WATER
8.5 Demand Specification
Water
Alfa Laval ref. 574487 rev. 0
Poor quality of the operating water may with time cause erosion,
corrosion and/or operating problems. The water shall be treated
to meet certain demands.
The following requirements are of fundamental importance:
1 Turbidity-free water, solids content <0,001% by volume.
Max. particle size 50 µm.
Deposits shall not be allowed to form in certain areas in the system.
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 surfaces in contact with the
operating water.Corrosion is a process that is accelerated by
increased separating temperature, low pH, and high chloride ion
concentration.
4 6,5 < pH < 9
Bicarbonate content (HCO3) min. 70mg HCO
3
per litre, which
corresponds to 3,2 °dKH.
N
O
T
E
Alfa Laval accepts no liability for consequences
arising from unsatisfactorily purified operating
water supplied by the customer.