Chicago Pneumatic CPF 270 Instruction Book page 75

Instruction book
Total A
dissolved
solids
(mg/l)
Interpretation of the values obtained:
• RSI < 6: boiler scale formation
• 6 < RSI < 7: neutral water
• RSI > 7: corrosive water
5. Free chlorine (Cl
Disinfecting with chlorine is not done in closed systems, neither in energy recovery systems.
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.
-
Cl (ppm)
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
2920 1796 01
Temperature
(°C)
86 - 91
92 - 95
As a general rule, the RSI index should be between 5.6 and 7.5. If that is not the case, contact
a specialist.
)
2
-
)
RSI < 5.5 5.6 < RSI < 6.2
200 350
2-
)
4
Standard
< 1000
< 1000
< 400
Dissolved iron (ppm)
Standard
< 1
< 1
< 1
B Ca hardness
(ppm CaCO
0.7 356 - 446
0.6 447 - 563
564 - 707
708 - 892
893 - 1000
6.3 < RSI < 6.8
500
Sulphate (ppm)
Energy recovery
< 0.2
not applicable
< 0.2
C M-Alkalinity
) (ppm CaCO
3
2.2 356 - 446
2.3 447 - 563
2.4 564 - 707
2.5 708 - 892
2.6 893 - 1000
6.9 < RSI < 7.5
350
Energy recovery
< 200
not applicable
< 200
Dissolved manganese (ppm)
Standard Energy recovery
< 0.2 < 0.05
< 0.2 not applicable
< 0.2 < 0.05
D
)
3
2.6
2.7
2.8
2.9
3.0
7.6 < RSI
200
73