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4.4 - exhibit Le (cont.)
4.4.6 - Boiler water quality
Ref: JIS-B-8223-1989
Kind of boiler
Maximum operating pressure
Kind of make-up water
pH (at 25°C)
Calcium hardness
Fat and oils
Dissolved oxygen
Iron
residue on evaporation
Conductivity (at 25°C)
Acid consumption (pH 4.8) (M-alkalinity)
Acid consumption (pH 8.3) (P-alkalinity)
Hydrazine
Chloride ion
Phosphoric acid ion
Processing
pH (at 25°C)
Acid consumption (pH 4.8) (M-alkalinity)
Acid consumption (pH 8.3) (P-alkalinity)
residue on evaporation
Conductivity (at 25°C)
Chloride ion
Phosphoric acid ion
Sulphurous acid ion
Hydrazine
2
Cylindrical boiler
(MPa)
1
Softening water
7 - 9
(mgCaCo
/l)
below 1
3
(mg/l)
keep low
(mg o/l)
keep low
(mg Fe/l)
-----
(mg/l)
-----
(µS/cm)
-----
(mgCaCo
/l)
-----
3
(mgCaCo
/l)
-----
3
(mgN
H
/l)
-----
2
4
(mgCl
/l)
-----
-
(mgPo
/l)
-----
3-
4
Alkali treatment
11.0-11.8
(mgCaCo
/l)
100 - 800
3
(mgCaCo
/l)
80 - 600
3
(mg/l)
below 2500
(µS/cm)
below 4000
(mgCl
/lit)
below 400
-
(mgPo
/l)
20 - 40
3-
4
(mgSo
/l)
10 - 50
2-
3
(mgN
H
/l)
0.1- 1.0
2
4
Water tube boiler
Multibubular boiler
1
1
Softening water
Softening water
7 - 9
7 - 9
below 1
below 1
keep low
keep low
keep low
keep low
below 0.3
below 0.3
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
-----
Alkali treatment
Alkali treatment
11.0-11.8
11.0-11.8
100 - 800
100 - 800
80 - 600
80 - 600
below 2500
below 2500
below 4000
below 4000
below 400
below 400
20 - 40
20 - 40
10 - 50
10 - 50
0.1- 1.0
0.1- 1.0
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