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The corrosive effect of natural water can vary considerably with its chemical composition. Water quality is of great
importance to avoid corrosion in the plate heat exchanger (condenser).
City Water
Normally is controlled and of good quality.
Well water
Is usually fairly cold and clean, which implies that it has a low biological content. However, the
concentration of scale forming salts (calcium and magnesium sulphates and carbonates) can sometimes
be very high. Pitting corrosion may be initiated due to salt deposits.
River and lake surface water
The concentration of scale forming salts is usually fairly low. However, there may be amounts of solids
ranging from salts and soil particles to leave. Some type of pre-treatment is necessary, particularly to
control biological activity
Sea water
Is not recommended because of the corrosive action of very high chloride concentrations
Check water quality and recommendation of use of the supplier of the condenser (SWEP), represented in table 5.
Page 38 from 63
Water Content
-
Alkalinity (HCO
)
3
2 -
Sulphate (SO
)
4
-
2 -
HCO
/ SO
3
4
Electrical Conductivity
pH
Ammonia (NH
)
3
-
Chlorides (Cl
)
6720649497 SM HP270-1 2012/09 en
Concentration
AISI 316
(mg/l or ppm)
<70
70 – 300
>300
<70
70 – 300
>300
> 1
< 1
< 10 μS/cm
10 – 500 μS/cm
> 500 μS/cm
< 6.0
6.0 – 7.5
0 / +
7.5 – 9.0
> 9.0
< 2
2 – 20
> 20
< 300
COPPER
+
0
+
+
+
0 / +
+
+
+
0 / +
0
-
+
+
+
0 / +
+
0
+
+
+
0
0
0
0
+
+
+
0
+
+
+
0
+
-
+
+
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