Atlas Copco GR110 User Manual

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

Atlas Copco GR110 Specifications

General

Brand	Atlas Copco
Model	GR110
Category	Air Compressor
Language	English