Atlas Copco GA 11+ Instruction Book page 92

For energy recovery systems, the limit is 100 ppm.
7. Sulphates (SO
Type of cooling system
Single pass
Recirculating (with tower)
Closed loop
8. Iron and Manganese
Type of cooling
system
Single pass
Recirculating (with
tower)
Closed loop
The values in bold are rejection limits.
9. Copper
Type of cooling system
Single pass
Recirculating (with tower)
Closed loop
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:
Type of cooling system
Single pass
Recirculating (with tower)
Closed loop
12. Oil or grease
< 1 ppm (rejection value)
13. Biology
If biology is present, it must be aerobic. Anaerobic biology (in closed systems) must be
avoided.
90
2-
)
4
Standard
< 1000
< 1000
< 400
Dissolved iron (ppm)
Standard Energy recovery
< 1 < 0.2
< 1 not applicable
< 1 < 0.2
Standard
< 1
< 1
< 1
Standard
< 10
< 10
< 10
Sulphate (ppm)
Energy recovery
< 200
not applicable
< 200
Dissolved manganese (ppm)
Standard
< 0.2
< 0.2
< 0.2
Copper (ppm)
Energy recovery
< 0.2
not applicable
< 0.2
Suspended solids (ppm)
Energy recovery
< 1
not applicable
< 1
Instruction book
Energy recovery
< 0.05
not applicable
< 0.05
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