SECTION 4 1800-3000 USER MANUAL
53
Pipe Sizing
Pipe should be sized at least as large as the
discharge connection of the compressor. Piping and
fittings should all be suitably rated for the discharge
pressure.
Use of Auxiliary Receiver Tank
An auxiliary receiver tank should be used in cases
where large demand swings are expected. This is not
necessary with a variable speed design.
Isolation Valve(s)
If isolation of the compressor from the service lines is
required, isolation valves should be installed close to
the discharge of the compressor. They should be
installed with drip legs that drain sloping downward
from the base in order to drain properly. Install a vent
to the piping downstream of the compressor outlet
connections, and upstream of the first isolation valve.
When two compressors are operated in parallel,
provide an isolation valve and a drain trap for each
compressor before the common receiver tank.
A built-in after-cooler reduces the discharge air
temperature below the dew point. For most ambient
conditions, considerable water vapor is condensed.
To remove the condensation, each compressor with
built-in after-cooler is supplied with a combination
condensate separator/trap. A drain line should be
installed on the condensate drain.
Fluid Containment
Compressors are equipped with a fluid containment
pan to catch any fluid in the event of a leak or spill.
The drain for the pan is located on the air intake end
of the machine. For indoor installations, the drain
should be plugged to contain fluids. For outdoor
applications, the drain must be connected to a
separate, customer supplied system to allow
rainwater or any accumulated compressor fluid to
drain out.
Figure 4-1: Service Air Piping, Typical Installation
1. Sullair Compressor
2. Sullair Dryer
3. Shut-Off Gate Valve
4. Sullair Filter
5. Water Leg Drain Valve
6. By-Pass Gate Valve
7. Standard Gate Valve
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