R90 - 160N / R90 - 160I / R90 - 160NE / R90 - 160IE
http://www.ingersollrandproducts.com
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7.0 INSTALLATION
7.4 WATERCOOLED UNITS
Cooling Water Piping
Water piping to and from the compressor package must
be at least as big as the package connection size, or
larger. Do NOT undersize the water piping!
Isolation valves with side drains should be installed
on both the inlet and outlet lines. To maintain cooler
cleanliness and reliability, it is important to install a
strainer of 2mm mesh size on the inlet line. Strainers are
available from
Ingersoll Rand
.
For sea water applications (sea water option only) a zinc
anode is NOT recommended as it will deteriorate the
copper oxide film on the 70/30 Copper-Nickel alloy tubes
in contact with sea water. To minimize galvanic corrosion
and provide the greatest corrosion protection to your
coolers, it is strongly recommended that a section of iron
pipe (>300mm length) be connected as close as possible
to the air compressor package water inlet connection. The
iron pipe will act as the sacrificial anode for the Copper-
Nickel tubes and therefore must be considered a regular
maintenance & replacement item. For this reason the
section of iron pipe should be installed so that it can be
easily replaced (i.e.: with a union joint).
The air compressor has a normally closed solenoid valve
that is fitted to the water outlet side, within the package.
The valve is wired into the air compressor control circuit
and closes when the compressor stops.
Carefully inspect your water system before installing the
air compressor package. Ensure that the piping is free of
scale and deposits that may restrict water flow to the air
compressor package. If water cleanliness is poor, filtration
installed on your water inlet pipe line is recommended.
Proper operation of your compressor requires that
the cooling water flow listed below be provided at a
maximum supply temperature of 46° C (115° F). Please
see the compressor engineering data sheets for cooling
water flow rates.
CAUTION
If you have a Harsh Water air compressor option
and you are using sea water or brackish water as
the cooling medium, DO NOT exceed the water
flow values listed on the compressor’s engineering
data sheets. Salts are very abrasive and their
ability to erode the heat exchanger tubes increase
significantly as the water velocity (flow) increases.
It is recommended that the pipe fitter or engineer
responsible for the supply piping include an
appropriately sized flow control device such as an
orifice to limit the maximum potential flow to the
air compressor. Effects of erosion or corrosion are
specifically excluded from warranty considerations.
Water temperature and pressure gauges should be
installed in the water piping for use in any fault finding
of the water system. Water pressure should ideally be
between 3 and 5 bar (43.5 and 72.5 psi) but must not be
above 10 bar (145 psi)
Water cleanliness is also extremely important. Cleaning of
coolers as a result of fouling is a customer responsibility.
Therefore, it is highly recommended that proper water
quality must meet the requirements listed in WATER
QUALITY RECOMMENDATIONS later in this section.
Venting the water system
Air should be vented from the water side of the system
to avoid poor performance and water hammer. Since
the air compressor uses different type heat exchangers
depending on your selection of “fresh water cooled” or
“Harsh water cooled” system, the venting procedure is
different. Be sure to use the correct procedure below.
Fresh water coolers (brazed plate heat exchangers):
1.
Disconnect the water stop valve in the water outlet
line of the compressor.
2.
Open the inlet water valve(s) to allow the water to
flow to the package.
3.
Allow all the air to escape from the system and water
is observed at the water outlet port.
4.
Connect the water stop valve.
5.
The system is now vented.
Harsh water coolers (shell & tube heat
exchangers):
1.
Locate the water system vent cocks on top of the
aftercooler and oil cooler.
2.
Open the water valve(s) allowing water to flow to the
package.
3.
Open the vent cocks and allow all air to escape from
the system. When water is observed at the vent cocks,
close them.
4.
The system is now vented.
Draining the water system
Should it become necessary to completely drain the
water system, use the following procedures specific to the
water cooled option you have.
Fresh water coolers (brazed plate heat exchangers):
1.
Disconnect the inlet water line from the connection
located at the rear of the unit.
2.
Disconnect the water stop valve in the water outlet
line of the compressor.
3.
Allow the system to completely drain.
