Atlas Copco GA 11+ Instruction Book page 91

Instruction book
Total A
dissolved
solids
(mg/l)
< 30 0.1
30 - 320 0.2
> 320 0.3
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)
2920 7118 31
Temperature
(°C)
0 - 1
2 - 6
7 - 11
12 - 16
17 - 22
23 - 27
28 - 32
33 - 38
39 - 43
44 - 49
50 - 55
56 - 61
62 - 67
68 - 73
74 - 79
80 - 85
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
B Ca hardness
(ppm CaCO
2.3 9 - 11
2.2 12 - 14
2.1 15 - 17
2.0 18 - 22
1.9 23 - 28
1.8 29 - 35
1.7 36 - 44
1.6 45 - 56
1.5 57 - 70
1.4 71 - 89
1.3 90 - 112
1.2 113 - 141
1.1 142 - 177
1.0 178 - 223
0.9 224 - 281
0.8 282 - 355
0.7 356 - 446
0.6 447 - 563
564 - 707
708 - 892
893 - 1000
6.3 < RSI < 6.8
500
C M-
) Alkalinity
3
(ppm
CaCO
0.6 10 - 11
0.7 12 - 14
0.8 15 - 17
0.9 18 - 22
1.0 23 - 28
1.1 29 - 35
1.2 36 - 44
1.3 45 - 56
1.4 57 - 70
1.5 71 - 89
1.6 90 - 112
1.7 113 - 141
1.8 142 - 177
1.9 178 - 223
2.0 224 - 281
2.1 282 - 355
2.2 356 - 446
2.3 447 - 563
2.4 564 - 707
2.5 708 - 892
2.6 893 - 1000 3.0
6.9 < RSI < 7.5
350
D
)
3
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.7
2.8
2.9
7.6 < RSI
200
89