Technical data

EPI – New Delhi Volume-2B, Rev.0 Page 6 of 11
CONTROL & INSTRUMENTATION
General
Electronic type instruments generally working on 4- 20 mA DC signal system
will be used. The instrument panel will be suitably installed in the compressor
room. All instrumentation items will be selected to function satisfactorily in shop
floor environment.
List of measurements & controls
For each compressor, the list of measurements & controls will include, but not
limited to, the following:
i) Equipment/ local panel mounted measurements
i. Indication of differential pressure across suction air filter for each
compressor.
ii. Indication of pressure of compressed air after after-cooler and after
compressor.
iii. Indication of temperature of compressed air after after-cooler and air
compressor.
iv. Indication of pressure of compressed air in air receiver.
v. Indication of pressure of lube oil before & after oil cooler.
vi. Indication of temperature of lube oil before & after oil cooler.
vii. Indication of differential pressure across lube oil filter.
viii. Indication of temperature at the inlet & outlet of common header of
compressor cooling water circuit.
ix. Indication of pressure at the outlet of common header of compressor
cooling water circuit.
x. Indication of flow of compressed air.
ii) Alarms and interlocks
01 Following audiovisual alarms and interlocks will be provided for each
compressor:
1) Differential pressure of air across suction air filter high Alarm only.
2) Temperature of air after air compressor high- Alarm only.