2920 1449 00
20
Instruction book
2.5.2 Cooling water parameters
The Rysnar stability index (RSI)
The Rysnar Index (RSI) is a parameter for predicting whether water will tend to dissolve or precipitate calcium carbonate. The
adhesion of scaling depositions and their effect are different on different materials, but the equilibrium of the water (scaling or
corrosive) is only determined by its actual pH value and by the saturation pH value (pH
S
).
The saturation pH value is determined by the relationship between the calcium hardness, the total alkalinity, the total solids
concentration and the temperature.
The Rysnar Index is calculated as follows :
RSI = 2*pH
S
- pH
where
pH =
measured pH (at room temp) of water sample
pH
S
=
pH at saturation.
The pH
S
is calculated by using :
pH
S
=
(9.3 + A + B) - (C + D)
A
:
depends on the total solids concentration (mg/l).
B
:
depends on the highest cooling water temperature (°C),
For GA/GR units take T = 75°C
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
Temperature
Ca-hardness
M-Alkalinity
solids (mg/l)
A
(°C)
B
(ppm CaCO
3
)
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
Содержание GR110
Страница 6: ...2920 1449 00 6 Instruction book Fig 1 4 GR Full feature during unloading ...
Страница 7: ...2920 1449 00 7 Instruction book Fig 1 5 GR Full feature during loading ...
Страница 14: ...2920 1449 00 14 Instruction book Fig 2 2 Dimension drawing GR110 W up to GR200 W ...
Страница 15: ...2920 1449 00 15 Instruction book Fig 2 3 Installation proposal 2 2 Installation proposals Fig 2 3 ...
