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The materials used in the Oventrop fresh water and
dwelling stations are selected and processed in accor-
dance with strict quality specifications. The plate mate-
rial (stainless steel 1.4401) used in the heat exchanger
has proven its durability in potable water applications.
Despite this, depending on the water quality, and in
particular in the case of high chloride concentrations
> 100 mg/l, it is possible that corrosion may cause
leakages from the heat exchangers.
It is therefore very important for the plant engineer and/
or user to ensure that the fresh water and dwelling sta-
tions are only operated using potable water of a chem-
ical composition that is non-corrosive for the station
components.
If necessary, consult your local water supply company.
The following table contains thresholds for substances in
potable water when using heat exchangers with different
Water quality requirements
SUBSTANCE
Chloride (Cl
) at 60 °C See
-
diagram on the reverse!
Hydrogen carbonate (HCO
Sulphate (SO
)
2-
4
HCO
/ SO
-
2-
3
4
Electrical conductivity at 20 °C
pH
As a general rule, a lower pH value
(below 6) increases the risk of cor-
rosion, while a high pH value (over
7.5) reduces the risk of corrosion.
Free chlorine (Cl
)
2
Ammonium (NH
)
+
4
Hydrogen sulphide (H
2
Free (aggressive) carbon dioxide
(CO
)
2
Nitrate (NO
)
-
3
NOTES:
The chemical composition of the potable water may be subjected to temporal fluctuations.
CONCENTRATION
(mg/l or ppm)
100–150
-)
3
70–300
<50 µS/cm
50–500 µS/cm
>500 µS/cm
6.0–7.5
7.5–9.0
9.0–9.5
S)
<0.05
>0.05
+
Good durability under normal conditions
0
Corrosion may occur
-
Not recommended for use
Fresh water station "Regumaq X-25"
Advice regarding corrosion protection
brazing materials (copper, nickel or stainless steel).
It is important to note that interactions may occur
between certain substances in water that can cause
considerable damage to the materials used.
This includes the combination of hydrogen carbonate
with chloride and/or sulphate (see following page).
A suitable heat exchanger must therefore be selected
on the basis of the water characteristics and the sub-
stances it contains. Your local water supply company
will provide corresponding analyses on request.
Stainless steel heat exchanger soldered with:
COPPER
<100
+
-
>150
-
<70
0
+
>300
0
<70
+
>70
-
>1.0
+
<1.0
-
0
+
0
<6.0
0
0
+
0
>9.5
0
<1
+
>1
-
<2
+
2–20
0
>20
-
+
-
<5
+
5–20
0
>20
-
<100
+
>100
0
NICKEL / STAIN-
COPPER
LESS STEEL
with protective
layer
+
-
-
+
+
+
+
+
+
+
+
+
+
0
+
+
+
+
+
-
+
+
+
+
+
+
+
+
+
+
+
+
0
+
+
+
+
+
+
+
+
+
+
+
+
+
+
0
+
0
+
+
-
+
0
+
+
+
+
+
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