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MCAC-CTSM-2018-1
Flooded type water cooled screw chiller (MIC)
93
Fig.27 Low pressure at full load (standard unit)
Cleaning work must be done a lot of scale is found. Physical and chemical cleaning can be chosen
according to the device you have. Generally, chemical cleaning is much easier to carry out. Methods are
as below. Arrange for a qualified water treatment specialist to develop and monitor a treatment program.
a) Cycle under normal temp. (A):
(Volume of co volume of pipes+ volume of container)×1/3
Note: concentration of detergent
——33%
b) Cycle under normal temp. (B):
(Volume of cooling tower flume + volume of co volume of pipes)×1/10
Note: concentration of detergent
——10%
Warning
: When you do cleaning while the unit stops, the volume of the cooling tower flume can be 1/2
or 1/3 of rated value. The volume of cooling tower flume should keep at the rated value if cleaning is
performed when the unit is running. Midea assumes no responsibility for pressure vessel damage
resulting from untreated or improperly treated water.
Requirement for cleaning and maintenance
Water quality
Scale
Corrosion
Remark
1
PH≤6 Acid water
Hard
Strong
Generates insoluble CaSO
4
2
PH≥8 Alkali water
Soft
——
Soft fluid deposit may be
caused by ions iron or
aluminum
3
Water with much Ca
2+
and
Mg
2+
Hard
——
Easily generates hard scale.
4
Water with much Cl
-
Dirt
Ultra-strong
Corrosive to copper and
iron.
5
Water with much SO
4
2-
and
SiO
2
2-
Hard
Strong
Generates hard CaSO
4
and
CaSiO
2
6
Water with much Fe
3+
Large quantity,
hard
Strong
Generates deposits Fe(OH)
3
and Fe
2
O
3
7
Odorous water
Large quantity
Ultra-strong
Generates sulfide, ammonia
and marsh gas, especially
H
2
S which corrodes copper.
8
Water with organic
substances
Large quantity
——
Easily generates scale
9
Exhaust gas from auto,
chemical factory, plating
Strong
Copper tubes of condenser
may be eroded and