−11−
Water Quality Criteria
Makeup water and cyclic water shall be the water within the range of water quality criteria
mentioned below.
If water quality is out of the range of criteria, it may cause a trouble such as scale adhesion and
corrosion.
Item
Cyclic water
(60°C
<
≦
90°C)
Makeup water
Standard items
pH (25°C)
−
7.0−8.0
7.0−8.0
Electric conductivity (25°C)
mS/m
≦
30
≦
30
Chloride ion
mgCl
−
/L
≦
30
≦
30
Sulphate ion
mgSO
4
2−
/L
≦
30
≦
30
Acid consumption (pH4.8)
mgCaCO
3
/L
≦
50
≦
50
Sulphate ion/Acid consumption
−
≦
0.5
≦
0.5
Total hardness
mgCaCO
3
/L
≦
70
≦
70
Calcium hardness
mgCaCO
3
/L
≦
50
≦
50
Ionic silica
mgSiO
2
/L
≦
30
≦
30
Reference items
Iron
mgFe/L
≦
1.0
≦
0.3
Copper
mgCu/L
≦
1.0
≦
0.1
Sulphide ion
mgS
2−
/L
Not detected
Not detected
Ammonium ion
mgNH
4
+
/L
≦
0.1
≦
0.1
Residual chlorine
mgCl/L
≦
0.1
≦
0.3
Free carbon
mgCO
2
/L
≦
0.4
≦
4.0
Stability index
−
−
Содержание ESA30EH2 Series
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