Quincy Compressor QOF 100 VSD Instruction Book page 91

Instruction book
16 Suspended
Solids (max
10μ)
17 Oil or Grease
18 Biology
Remarks on the technical specifications
Parameter
1 pH
2 Conductivity
6 Ryznar Stability Index (RSI) Recommended actions: refer table for RSI
7 Chlorides
8 Nitrates
10 Sulphates
11 Chemical Corrosion Index
15 Ammonium
16 Suspended Solids (max
10μ)
18 Biology
Ryznar Stability Index (RSI)
The Ryznar Stability Index (RSI) is a parameter for predicting whether water will tend to
dissolve or precipitate calcium carbonate. The adhesion of scaling deposits 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
The saturation pH value is determined by the relationship between the calcium hardness,
the total alkalinity, the total solids concentration and the temperature.
The Ryznar Stability Index is calculated as follows:
RSI = 2*pH
Reference
pH
pH
s
The pHs is calculated by using:
pH = (9.3 + A + B) - (C + D)
s
Reference
A
B
C
D
87
ppm < 10
ppm < 1
CFU / < 10 5
mL
– pH
s
Description
Measured pH (at room temperature) of water sample
pH at saturation
Description
( log(TDS) - 1)/10
10
13.12 x log(°C+273) + 34.55
10
log(Ca ) - 0.4 (Ca + expressed as ppm CaCO
10
2+ 2
log(M-Alkalinity) (M-Alkalinity expressed as ppm CaCO
10
< 1 < 10
< 1 < 1
< 10 5 < 10
Remarks
For stainless steel systems without other materials, pH can
be down to 6.
For closed loop systems, higher pH values are possible
Conductivity and TDS linked with conversion factor
(theoretical factor possible, but practical determination
recommended at least once)
or shock treatment max. 2 ppm for 30 min/day
(*) Limit 200 ppm applicable when RSI < 5.6 or RSI > 7.5
Rejection < 2000 ppm. To be measured for calculating RSI.
Index = (Chlorides + Sulphates + Nitrates) / (M-Alkalinity) (all
expressed in meq/l)
limit not applicable for Cu-free systems
No particles > 10μ allowed. (Particles <0.5μ not considered).
Anaerobic biology in closed system never allowed.
< 10
< 1
3 < 10 3
)
3
)
3
< 1
< 1
< 10 3
).
s
9829 3342 32-01