Cooling water assessment based on water substances
The following table provides an overview of the resistance of copper-nickel pipes to water content in non-drinking water.
Evaluation criterion | Approximate concentration | Evaluation CuNi10Fe1Mn |
|---|---|---|
pH value | < 6 | 0 |
6 to 9 | + | |
> 9 | 0 | |
Chloride | to 1000 | + |
> 1000 | + (< 25 000 mg/l) | |
Sulfate | Up to 70 | + |
70 to 300 | + | |
> 300 | + (< 25 000 mg/l) | |
Nitrate | Up to 100 | + |
> 100 | 0 | |
Free (aggressive) carbon dioxide | Up to 20 | + |
20 to 50 | 0 | |
> 50 | – | |
Oxygen | Up to 2 | + |
> 2 | + | |
Ammonium | Up to 2 | + |
2 to 20 | + | |
> 20 | – | |
Iron (dissolved) | Up to 10 | 0 |
> 10 | – | |
Manganese (dissolved) | Up to 1 | 0 |
> 1 | – | |
Free chlorine | Up to 5 | Permanently < 0.5 mg/l |
> 5 | Intermittently < 3.0 mg/l | |
Sulfide |
| 0 |
Ammonia |
| + (< 15 mg/l) |
+ | = usually good resistance |
0 | = corrosion problems can occur, particularly if multiple factors are valued at 0 |
– | = use is not recommended |
