8 Technical Reference 8.5 Demand specification water
8.5 Demand specification water
Alfa Laval ref. 574487 Rev. 1
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.
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 (HCO
3
)min. 70mgHCO
3
per litre, which corresponds to 3,2 °dKH.
N
O
T
E
Alfa Laval accepts n o liab ility for consequences
arising from unsatisfactorily purified operating water
supplied by the customer.
191
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