IDX-OM-M051
Air Dryer
4. Checks and Inspection
4.2 Parts requiring regular maintenance
4 - 2
IDF100F~150F-W
Table 2
Item
Facility water system
Circulating type
Transient type
Circulating fluid
Filling of
circulating fluid
Transient fluid
S
tanda
rd ite
m
s
pH [25°C]
6.5 to 8.2
6.0 to 8.0
6.8 to8.0
Electrical conductivity (mS/m) [25°C]
80 or less
30 or less
40 or less
Chloride ions (mg/L)
200 or less
50 or less
50 or less
Sulfuric acid ions (mg/L)
200 or less
50 or less
50 or less
Acid consumption [pH4.8](mgCaCO
3
/L)
100 or less
50 or less
50 or less
Total hardness (mgCaCO
3
/L)
200 or less
70 or less
70 or less
Calcium hardness (mgCaCO
3
/L)
150 or less
50 or less
50 or less
Ionic state silica (mgSiO
2
/L)
50 or less
30 or less
30 or less
R
e
fe
re
nc
e
items
Iron (mg/L)
1.0 or less
0.3 or less
1.0 or less
Copper (mg/L)
0.3 or less
0.1 or less
1.0 or less
Sulfide ions (mg/L)
Shall not be
detected.
Shall not be
detected.
Shall not be
detected.
Ammonium ions (mg/L)
1.0 or less
0.1 or less
1.0 or less
Residual chloride (mg/L)
0.3 or less
0.3 or less
0.3 or less
Free carbon dioxide (mg/L)
4.0 or less
4.0 or less
4.0 or less
Stability index
6.0 to 7.0 or less
-
-
-
Water quality inspection (Once a month)
If tap water or ground water (well water) is used as the facility water for the water-cooled condenser, test
the items shown in Table 2 using JIS K 0101 (Test methods for industrial water) or methods based on these
methods, and determine the applicability of the water based on the criteria shown in Table 2.
If the values are outside of the criteria, the following measures shall be taken before using it.
a) Change of the water source (e.g. Change ground water to tap water.)
b) Consult a water treatment consultant about how to treat the water.
c) Change the cooling method from transient type to circulating type, and use applicable facility water.
If the facility water in a cooling tower is used, the water quality standard will be satisfied at the initial stage,
however, if it is used in an air contaminated environment, sulfurous acid gas in the air may dissolve into the
facility water, forming sulfuric acid which may corrode the electro-thermal surface. Therefore, control the
water quality regularly by inspecting and replacing the facility water regularly.