Regulations and care
Cooling Water
A4.05.09.00
M20-M601C
en / 20.01.2000 BA000198 2/2
Ĺ
*) Water hardness:
Water which does not fulfil the above requirements must be hardened or softened.
Water with a hardness of < 12° (10°) dGH must be brought within the specified range by
mixing with condensate or fully de-ionized water (by ion exchange), see Diagram I
(A4.05.09.03).
Condensate and fully de-ionized water should be hardened up to 3° dPH. Magnesium
sulfate (Mg SO
4
) should be used for this purpose, if corrosion inhibiting oils are used.
Dosing:
For 1° dPH 21.4 mg Mg SO
4
per ton of water are required.
German total = Permanent hardness + Carbonate hardness
dGH = dPH + dKH
Comparison with other values:
1° dGH = 0,18° mmol/l
1° dGH = 1,79° French hardness
1° dGH = 1,25° British hardness
1° dGH = 17,9 USA hardness
**) pH value:
Concentration of hydrogen ions
< 7 = acid, 7 = neutral, > 7 = alkaline.
***) In general, the corrosion inhibiting effect of chemicals shows the best results with low
water hardness values (- 0). At higher hardness values and with missing hardness
stabilization the chemicals may react with water contents, what may result in
precipitations and in reduction of the inhibiting effect.
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