A continuous level of 0.5 ppm should not be exceeded. For shock treatments, a maximum
limit of 2 ppm for maximum 30 minutes/day applies.
6.
Chlorides (Cl
-
)
Chloride ions will create pitting corrosion on stainless steel. Their concentration should be
limited, depending from the RSI value.
RSI < 5.5 5.6 < RSI < 6.2 6.3 < RSI < 6.8 6.9 < RSI < 7.5 7.6 < RSI
Cl
-
(ppm)
200 350 500 350 200
For energy recovery systems, the limit is 100 ppm.
7.
Sulphates (SO
4
2-
)
Sulphate (ppm)
Type of cooling system Standard Energy recovery
Single pass < 1000 < 200
Recirculating (with tower) < 1000 not applicable
Closed loop < 400 < 200
8. Iron and Manganese
Dissolved iron (ppm) Dissolved manganese (ppm)
Type of cooling
system
Standard Energy recovery Standard Energy recovery
Single pass < 1 < 0.2 < 0.2 < 0.05
Recirculating (with
tower)
< 1 not applicable < 0.2 not applicable
Closed loop < 1 < 0.2 < 0.2 < 0.05
The values in bold are rejection limits.
9. Copper
Copper (ppm)
Type of cooling system Standard Energy recovery
Single pass < 1 < 0.2
Recirculating (with tower) < 1 not applicable
Closed loop < 1 < 0.2
10. Ammonium
The limit of 0.5 ppm is a rejection limit.
The limitation only applies for copper containing systems.
11. Suspended solids
Large particles (size > 10 µm) should not be present as they can be filtered out.
Small particles (< 0.5 µm) are not taken into account.
For particles between 0.5 µm and 10 µm, the following limits apply:
Instruction book
74 2920 7110 05
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