Ulvac C10T, Инструкция по эксплуатации

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Compressor Unit Instruction Manual
ULVAC CRYOGENICS INCORPORATED 3-3
Table 3-1 Recommended Cooling Water for Compressor
Item Unit Allowable Range
pH (25°C) ※１ pH 6.5 - 8.0
Conductivity (25°C) ※１ mS/m < 30
Chloride Ion, CI
-
※１ mg / L < 50
Sulfate Ion, SO
4
2-
※１ mg SO
4
2-
/ L < 50
Acid Consumption (pH4.8) ※１ mgCaCO
3
/ L < 50
Total Hardness ※１ mgCaCO
3
/ L < 50
Total Carbonic Acid ※１ mg/ L < 10
Calcium Carbonate mg/ L < 75
※１
The values of the items are based on the water quality management standards of
Japan Refrigeration and Air Conditioning Industry Association.
(*)The ground water may contain large amount of total carbonic acid and lower the pH value
excessively. Therefore, if the ground water is used in the transient style, accidents may occur by
corrosion even in a short-term use of the heat exchanger. Ensure that the density of carbonic
acid is less10mg/L. Since the dissolved ratio of total carbonic acid depends on the
temperature and the pressure, analyze the ground water immediately after take it in without
exposing to the atmosphere. Check the water supply whether it is the ground water or not
before use. It is highly recommended to use cooling tower to circulate the water containing a
large amount of carbonic acid.
３．
Cooling water should be stopped when the compressor is not running or it may cause
corrosion or clogged pipe and damage the heat exchanger.
If cooling water below 10°C keeps flowing while the compressor is not in operation, over heat
and starting difficulty may occur due to the viscosity rise of the compressor oil.
CAUTION
The cooling water must be drained and purged from the compressor unit when:
・
There is a possibility that the cooling water might freeze when the compressor unit is not
running. The water pipe can burst.
・
The compressor unit will not be turned on for a long time (more than a week).
・
Shipping the compressor unit.
Most of the cooling water can be purged from the compressor by blowing air into the compressor for
30 seconds at inlet pressure of 0.2MPaG with
the outlet opened.