7
1.2. Compressed Air Flow
FIGURE 1 - COMPRESSED AIR FLOW
Air to be compressed enters the cabinet, then in to two air filter housings (See Figure 9).
The air then flows through a two-stage, high efficiency air filter. Filtered air flows through
a flex connector into the CCV, and then into the inlet of the compressor 1st stage.
The compressor 1st stage compresses filtered air to approximately 30 PSIG (2.11
kg/cm2). The compressed air is discharged into the air-cooled intercooler where it is
cooled to approximately 25°F (~14°C) above ambient air temperature. The cooled
compressed air then passes through a moisture separator to remove any condensed
moisture from the air stream before entering the compressor 2nd stage.
The 2nd stage compresses interstage air to the final compressor outlet pressure, as
controlled by PLC pressure settings. The compressed air then passes through an air-
cooled aftercooler, where it is cooled to approximately 25°F (~14°C) above ambient air
temperature. The compressed air exits the aftercooler into a moisture separator where
condensed moisture is removed before the system check valve. Then the air exits the
unit to the plant compressed air system. An ASME safety valve is located upstream of
the check valve.
The compressed air circuit is protected by the following discrete devices:
•
Discharge safety relief valve
The PLC (see Description of Operations) monitors the compressed air circuit for:
•
1st Stage Suction air pressure
•
2nd Stage Suction air pressure
•
Compressor Outlet air pressure
•
Inlet air temperature
•
1st Stage Discharge air temperature
•
2nd Stage Suction air temperature
