ϵϴ
1904 0504 83
monitoring of concentrations and properties, prevention of sludge formation and maintenance of the
system. This applies also to treatment with antifreeze products. They must be provided with suitable
stabilizers and inhibitors. Specifications are also depending on the type of cooling circuit (open, once
through / recirculating with tower / closed) and on the application (Standard – max 65 °C cooling water
temperature at the outlet) or Energy Recovery (water temperature up to 95 °C)
.
In case water is not in line with recommended values or if any doubt, consult the manufacturer.
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1.
í
/
The effect of pH is already included in the Ryznar Stability Index (RSI - see item 4 below), but also
the pH itself is subject to limitations:
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0 1
ß ß
2
Ø ç è
3
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3
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4 5 6
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6 2 3 7
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6
ç Û
6
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8
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1
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Single pass Containing copper
: ; <
-
=
; > : ; <
-
=
; >
Stainless steel with carbon
: ; <
- 9.3
: ; <
- 9.3
steel and / or cast iron
Stainless steel only
:
- 9.3
:
- 9.3
Recirculating (with tower) Containing copper
: ; <
-
=
; >
not applicable
Stainless steel with carbon
: ; <
- 9.3
steel and / or cast iron
Stainless steel only
:
- 9.3
Closed loop Containing copper
? ; @
-
=
; > ? ; @
-
=
; >
Stainless steel with carbon
? ; @
- 9.3
? ; @
- 9.3
steel and / or cast iron
Stainless steel only
:
- 9.3
:
- 9.3
The values in
*
ë ó
are rejection limits.
When the system contains Zn or Al, the pH must be < 8.5.
2.
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ï
ð ë ó
ð
A
'
þ
B
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The conductivity is expressed in ȝS/cm, the TDS in ppm.
Both parameters are related with each other. The conductivity is convenient for quick monitoring of general
water quality, but the TDS is required for calculating the RSI. If only one of both parameters is measured, an
estimation can be obtained by using a theoretical conversion factor (0.67):
TDS = conductivity x 0.67
3.
/
ò î
ï ð ð
Different types of hardness are in relation with each other and together with the pH and the
alkalinity of the water they determine the equilibrium situation of the water, determined and
specified by the RSI. In addition, the calcium hardness must be limited to:
C
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4
C
6
C E
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