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20
7.0 INSTALLATION
7.2 DISCHARGE AND CONDENSATE PIPING
It is essential when installing a new compressor [1],
to review the total air system. This is to ensure a safe
and effective total system. One item which should be
considered is liquid carryover. Installation of air dryers
[3] is always good practice since properly selected and
installed they can reduce any liquid carryover to zero.
A receiver [2] may be necessary to ensure that the total
system volume is not less than 2.0 U.S. Gal. per rated
delivery C.F.M.
Discharge piping should be at least as large as the
discharge connection of the compressor. All piping
and fittings should be suitably rated for the discharge
pressure.
It is good practice to locate an isolation valve close to the
compressor and to install line filters [4].
Include a means [6] to vent the discharge pipework
downstream from the minimum pressure check valve
located on the separator tank. Upstream of the first
system isolation valve [7].
The discharged air contains a very small percentage of
compressor lubricating oil and care should be taken to
ensure that downstream equipment is compatible.
When two rotary units are operated in parallel, provide an
isolation vaIve and drain trap for each compressor before
the common receiver.
The built−in aftercooler reduces the discharge air
temperature below the dew point (for most ambient
conditions), therefore, considerable water vapor
is condensed. To remove this condensation, each
compressor with built−in aftercooler is furnished with a
combination condensate separator/trap.
A dripleg assembly and isolation valve should be
mounted near the compressor discharge. A drain line
should be connected to the condensate drain in the base.
IMPORTANT: The drain line must slope downward from
the base to work properly. For ease of inspection of the
automatic drain trap operation, the drain piping should
include an open funnel.
NOTICE
For low volume systems that may not include a
receiver [2], compressor response time may need
adjusting. Contact your local IR service agent.
CAUTION
The use of plastic bowls on line filters and other plastic air line components without metal guards can be
hazardous. Their safety can be affected by either synthetic coolants or the additives used in mineral oils. From
a safety standpoint, metal bowls should be used on any pressurized system.
NOTICE
Do not use the compressor to support the discharge pipe.