n
Seawater is not suitable due to its corrosive properties and will
result in corrosion in the cooling water circuit.
n
Water containing iron and iron particles in the water lead to cor-
rosion in the cooling water circuit.
n
Hard water is not suitable for cooling due to the high lime con-
tent resulting in calcification in the cooling water circuit.
n
Cooling water with suspended matter is not suitable.
n
Untreated, non-purified water, for example river or cooling
tower water, is not suitable due to its microbiological content
(bacteria) that may settle in the cooling water circuit.
Data
Value Unit
pH value
7.5
–
9.0 ---
Hydrogen carbonate [HCO
3
-
]
70
–
300 mg/l
Chlorides
< 50 mg/l
Sulphates [SO
4
2-
]
< 70 mg/l
Ratio of hydrogen carbonate [HCO
3
-
] /
sulphates [SO
4
2-
]
> 1 ---
Total water hardness
4.0
–
8.5 °dH
Electrical conductivity
30
–
500 μS/cm
Sulphite (SO
3
2-
)
< 1 mg/l
Free chlorine gas (Cl
2
)
< 0.5 mg/l
Nitrates (NO
3
-
)
< 100 mg/l
Ammonia (NH
3
)
not permitted ---
Iron (Fe), in solution
< 0.2 mg/l
Manganese (Mn), in solution
< 0.05 mg/l
Aluminium (Al), in solution
< 0.2 mg/l
Free, aggressive carbonic acid (CO
2
)
not permitted ---
Hydrogen sulphide (H
2
S)
not permitted ---
Algae growth
not permitted ---
Suspended matter
not permitted ---
Suitable cooling water quality
Before starting up
Variocool
27
Summary of Contents for VC 10000
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