SURGE PROTECTION/CAPACITY CONTROL FOR CRITICAL COMPRESSORS IN JAMNAGAR

·        HEAT PUMP COMPRESSOR

Ø MIN FLOW CONTROLLER IN DCS WITH OPERATOR ENTERED SET POINT

Ø MANUAL SPEED CONTROL THROUGH DCS

·        PLAT FORMER/ISOMAR GAS COMPRESSORS

Ø MIN MECHANICAL STOP IN SUCTION VALVES

Ø SURGE DETECTION AND TRIP MOTOR LOW CURRENT

Ø IGV CONTROL FROM DCS

·        TAIL GAS COMPRESSOR

Ø DEDICATED CONTROL SYSTEM "TURBOLOG" FROM GHH BASED ON COMPRESSOR PERFORMANCE MAP

Ø SURGE CONTROL BY RECYCLE VALVE

Ø MIN OPENING BY OPERATOR

Ø SUCTION PRESSURE CONTROL BY IGV IMPLEMENTED IN GHH

Ø TRIP ON SURGE

·        VGO HT COMPRESSOR

Ø DEDICATED CONTROL SYSTEM "TURBOLOG" FROM GHH BASED ON COMPRESSOR PERFORMANCE MAP

Ø SURGE CONTROL BY RECYCLE VALVE

Ø TO HASNDLE DIFFERENT PROCESS CONDITIONS (MOL WT CHANGE) SELECTION SWITCH IS PROVIDED IN THE UCP. MOL WT-2.0,4.3,7.2 28

Ø VISUALIZATION IS PROVIDED IN THE PIB.

Ø MIN OPENING BY OPERATOR

Ø CAPACITY CONTROL IS BY SPEED CONTROL BY OPERATOR.

·        HYDROGEN RFG COMPRESSOR

Ø DEDICATED MULTI VARIABLE CONTROL FROM CCC SERIES 3+ CONTROLLER

Ø SURGE CONTROL BY RECYCLE VALVE

Ø CAPACITY CONTROL BY DISCHARGE PRESSURE CONTROLLER

·        COKER GAS COMPRESSOR

Ø DEDICATED MULTI VARIABLE CONTROL FROM CCC SEREIS 3+ CONTROLLER

Ø SURGE CONTROL BY RECYCLE VALVE  SEPARATELY FOR FIRST AND SECOND STAGE

Ø ASC HAS PRESSURE OVERRIDE CONTROL(POC) FOR THE FIRST STAGE DISCHARGE PRESSURE

Ø AUTO CAPACITY CONTROL  BY SPEED VARIATION BASED ON SUCTION PRESSURE/COLUMN OVERHEAD PR.

Ø DECOUPLING BETWEEN PERFORMANCE AND ANTI SURGE CONTROLLER

·        PRT

Ø DEDICATED CONTROL SYSTEM FROM CCC

SERIES 4 SYSTEM

Ø CONTROL SYSTEM IS DUAL REDUNDANT AND FAULT TOLERANT

Ø SPEED/IGV POSITION CHANGE IS  TAKEN CARE BY USING INVARIANT CO ORDINATE SYSTEM

Ø FALL BACK STRATEGY IS IMPLEMENMTED

Ø PRT CONTROLS ARE VERY COMPLEX DUE TO MULTIPLE INTERACTING CONTROLS SUCH AS

          EXPANDER CONTROL

          DELTA P CONTROL RX/RG

          STEAM TURBINE CONTROLS

          BLOWER CAPACITY CONTROL

          LOAD SHARING CONTROL

          M/G CONTROL( LIMIT CONROL)

                  

Ø GHH TURBOLOG CONTROL SYSTEM FOR START UP AND MACHINE PROTECTION

Ø GHH SPECIAL SURGE DETECTOR BASED ON DP REVERSAL/ 'T' REVERSAL( FAST T/C) ACROSS SUCTION AND DISCHARGE OF THE BLOWER