Instruction book
2920 1472 03
40
C : depends on the calcium hardness (ppm CaCO
3
).
D : depends on the HCO
3
-
concentration or M-alkalinity (mval/l).
The values from A, B, C and D are found in the table below.
Total
dissolved
solids
Temperature
Ca-
hardness
M-Alkalinity
(mg/l)
A
(°C)
B
(ppm
CaCO3)
C (mval/l)
D
50 - 300
0.1
0 - 1
2.6
10 - 11
0.6
0.20 - 0.22
1.0
400 -
1000
0.2
2 - 6
2.5
12 - 13
0.7
0.24 - 0.26
1.1
7 - 9
2.4
14 - 17
0.8
0.28 - 0.34
1.2
10 - 13
2.3
18 - 22
0.9
0.36 - 0.44
1.3
14 - 17
2.2
23 - 27
1.0
0.46 - 0.54
1.4
18 - 21
2.1
28 - 34
1.1
0.56 - 0.70
1.5
22 - 27
2.0
35 - 43
1.2
0.72 - 0.88
1.6
28 - 31
1.9
44 - 55
1.3
0.90 - 1.10
1.7
32 - 37
1.8
56 - 69
1.4
1.12 - 1.38
1.8
38 - 44
1.7
70 - 87
1.5
1.40 - 1.76
1.9
45 - 50
1.6
88 - 110
1.6
1.78 - 2.20
2.0
51 - 56
1.5
111 - 138
1.7
2.22 - 2.78
2.1
57 - 63
1.4
138 - 174
1.8
2.80 - 3.54
2.2
64 - 71
1.3
175 - 220
1.9
3.54 - 4.40
2.3
72 - 80
1.2
230 - 270
2.0
4.6 - 5.4
2.4
280 - 340
2.1
5.6 - 7.0
2.5
350 - 430
2.2
7.2 - 8.8
2.6
440 - 550
2.3
9.0 - 11.0
2.7
560 - 690
2.4
11.2 - 13.8
2.8
700 - 870
2.5
14.0 - 17.6
2.9
880 -
1000
2.6
17.8 - 20.0
3.0
The interpretation of the values obtained is :
RSI < 6
boiler scale formation
RSI 6 – 7
neutral water
RSI > 7
corrosive water
