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COMPRESSOR SCHEMATIC

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VIBRATION MONITORING

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TEMP MONITORING

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DCS

PLC

GOVERNOR 

 CONTROL

OVER SPEED

DETECTION

VIBRATION

TEMP

SYSTEM

ANTISURGE

SYSTEM

ESD

MCC

LOCAL

PANEL

LOCAL

PANEL

CONTROL SYSTEMS BLOCK DIAGRAM

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LO SYSTEM

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LEVEL GAUGE

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PRESSURE SWITCH

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TRANSMITTER 

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TEMP SWITCH

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PRESSURE GAUGE WITH SWITCH

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RTD MOUNTED ON BEARING PAD

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VIBRATION PROBE

SPEED PROBE

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SEAL SYSTEM

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PLC

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+ 24 Vdc

RELAY

 NO CONTACT

 NC CONTACT- 24 Vdc

SWITCH

PRESSURE

TEMP

TRIP RELAY

LEVEL

TRIP

SOV

ALAR 

RELAY LOGIC   DCS

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Surge control Diagram:

The diagram below shows the performance map of a compressor with the surge

control lines .

1. SURGE L!T L"E #.SURGE $%"TR%L L"E

&.'ER(%R!)"$E $UR*ES +.%'ER)T"G '%"T

Pd

------

Ps

2

3

FLOW

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A!"s#$%& C'!$'( S)s!&*

Compressor 

Antisurge Valve

(T'T'T(TTT   TT

ANTI SURGE

CONTROLLER

(,