INSTALLATION / HANDLING
44
SL, SM & SH 90, 110, 132, 150, 200, 250 &300 (50Hz)
L, H & HH 125, 150, 200, 250, 300, 350 & 400 (60Hz)
SIERRA SIZE
MINIMUM WATER FLOW
(m
3
/h) (gall/min)
S90 (125HP)
7,5 (33)
S110 (150HP)
8,6 (38)
S132 (–)
9,6 (–)
S150 (200HP)
11,0 (48)
S200 (250HP)
13,6 (60)
– (300HP)
– (72)
S250 (350HP)
19,1 (84)
S300 (400HP)
21,3 (94)
Water temperature and pressure gauges should be installed in the
water piping for use in any fault finding of the water system.
Water cleanliness is also extremely important. Strainers are
available from Ingersoll–Rand for units on open evaporative cooling
towers, etc., where precipitates and particulates are present in the
coolant stream. Cleaning of coolers as a result of fouling is a customer
responsibility. Therefore, it is highly recommended that proper water
strainers are utilised. In addition, water quality must meet the
requirements listed in WATER QUALITY RECOMMENDATIONS later
in this section.
VENTING THE WATER SYSTEM
At the initial installation, or for startup after draining the water
system, proceed to vent the system as follows.
1. Locate the water system vent cock on top of the intercooler.
2. Open the water valve(s) allowing water to flow to the package.
3. Open the vent cock and allow all air to escape from the system.
When water is observed at the vent cock, close it.
The system is now properly vented.
DRAINING THE WATER SYSTEM
Should it become necessary to completely drain the water system,
proceed as follows.
1. Disconnect the inlet and discharge water lines from the connections
located at the rear of the unit.
2. Locate the oil cooler by removing the left and centre rear panels.
Remove the two drain plugs located at the end of the cooler.
Allow the system to completely drain.
WATER QUALITY RECOMMENDATIONS
Water quality is often overlooked when the cooling system of a
water cooled air compressor is examined. Water quality determines
how effective the heat transfer rate, as well as the flow rate will remain
during the operation life of the unit. It should be noted that the quality
of water used in any cooling system does not remain constant during
the operation of the system. The water make–up is effected by
evaporation, corrosion, chemical and temperature changes, aeration,
scale and biological formations. Most problems in a cooling system
show up first in a reduction in the heat transfer rate, then in a reduced
flow rate and finally with damage to the system.
There are many constituents in the water system that must be
balanced to have a good, stable system. The following major
components should be monitored:
SCALE:
Scale formation inhibits effective heat transfer, yet it does help
prevent corrosion. Therefore, a thin uniform coating of calcium
carbonate is desired in the inner surfaces. Perhaps the largest
contributor to scale formation is the precipitation of calcium carbonate
out of the water. This is dependent on temperature and pH. The higher
the pH value, the greater the chance of scale formation. Scale can be
controlled with water treatment.
CORROSION:
In contrast to scale formation is the problem of
corrosion. Chlorides cause problems because of their size and
conductivity. Low pH levels promote corrosion, as well as high levels
of dissolved oxygen.
FOULING:
Biological and organic substances (slime) can also cause
problems, but in elevated temperature environments such as cooling
processes they are not a major concern. If they create problems with
clogging, commercial shock treatments are available.
To ensure good operation life and performance of the compressor
cooling system, the recommended acceptable ranges for different
water constituents are included below:
Corrosivity (Hardness, pH, Total dissolved solids, Temperature at inlet
and Alkalinity should be analysed monthly, or if stable for 3 to 4 months,
analysed quarterly.
Acceptable concentration:
Langelier Index 0 to 1
Iron content should be analysed monthly.
Acceptable concentration:
2 mg/l (2 ppm)
Sulphate content should be analysed monthly.
Acceptable concentration:
50 mg/l (50 ppm)
Chloride content should be analysed monthly.
Acceptable concentration:
50 mg/l (50 ppm)
Nitrate content should be analysed monthly.
Acceptable concentration:
2 mg/l (2 ppm)
Silica content should be analysed monthly.
Acceptable concentration:
100 mg/l (100 ppm)
Dissolved Oxygen content should be analysed daily, or if stable,
analysed weekly.
Acceptable concentration:
0 mg/l (0 ppm) (as low as possible)
Oil and Grease content should be analysed monthly.
Acceptable concentration:
5 mg/l (5 ppm)
Ammonia content should be analysed monthly.
Acceptable concentration:
1 mg/l (1 ppm)
ROTATION CHECK
CAUTION :
If the compressor is operated in the opposite direction of
rotation, airend damage may result and is not warrantable.
