Friday, August 26, 2011

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

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