| 1. MASTER FUEL TRIP1) Both ID Fans OFF 2/3 2) Both FD Fans OFF 2/3 3) Water wall Circulation incorrect 2/3 4) EMG PB & Release PB pressed together in desk 5) EMGPB & Release PB pressed together in UCP 6) Furnace Pressure Very low(<-175mmwc) 2/3 7) Furnace Pressure Very High(>150mmwc) 2/3 8) Drum Level Very High(>250mm) 2/3 TD10s 9) Drum Level Very Low(<-375mm) 2/3 TD5s 10) Total Air Flow<30%(<540tph) 11) Loss of Reheat ProtectionTD10s 12) Unit 24 V dc not available 13) Unit 220V DC not available TD2s 14) [ Less than Fireball AND Loss of 110 Vac in any elev. in service ] 15) Unit Flame Failure Trip 16) Loss of All Fuel Trip 17) Both SAH OFF 18) All BFP Tripped TD10s 19) Emergency trip command from any OWS 20) 2/3 MFT both net work fail 21) 2/3MFTDPU output frozen |
| 1.1) WATERWALL CIRCULATION INCORRECT1) All Three BCW ON AND Each DP< 10psi 2/3 2) Any Two BCW ON AND both DP<10psi 3) Any One BCW ON AND its DP<10psi 4) Boiler ON AND All BCW OFF TD5s1.2) LOSS OF ALL FUEL TRIP1) Loss of all fuel trip arming AND All feeders OFF AND [ LOTV not open OR Elev. AB all LONV closed OR Elev. AB backup trip] AND [ HOTV not open OR [ In all HO elev. Either HONV closed OR backup trip]1.2.1) LOSS OF ALL FUEL TRIP ARMING1) Any elev. any nozzle valve not closed1.3) LESS THAN FB AND LOSS OF110V AC IN ANY ELEV IN SERVICE1) All feeders OFF AND [ Any oil elev. start memory active AND Loss of 110 V ac ] TD2s 1.4) UNIT FLAME FAILURE TRIP1) Unit flame failure trip arming AND All elev. A-K voted no flame 1.4.1) UNIT FLAME FAILURE TRIP ARMING1) Any feeder proven for 2s |
| 1.4.2) NO FLAME VOTING LOGIC (forelevA)1) FeederAnotprovenformorethan2s 2) Elev. AA ¾ FB scanner no flame AND [[ Elev. AB started AND lossof110VacpowerTD2s] OR [ Elev. AB 2/4 nozzle v/v not proven AND Elev. AB ¾ FB scanner no flame ]]1.5) LOSS OF RE-HEATER PROTECTION1) Re-heater protection enabled AND Generator CB Opened AND [ Both HPBP closed(<2%) OR [ Either LPBP stop v/v OR LPBP CV in both LPBP line closed] 2) Re-heater protection enabled AND [ [ Turbine HP v/v& HPBP closed] OR [ Turbine IP v/v& LPBP closed]]1.5.1) RE-HEATER PROTECTION ENABLED1) Drum press.> 8ata AND [ Any feeder ON OR Boiler firing ON ] AND [ Any LPBP stop v/v open AND Corresponding LPBP CV>2% open] AND [ Any HPBP v/v> 2% open] AND No MFT1.5.2) TURBINE HP V/V & HPBP CLOSED1) [ Either HP stop v/v OR HP control v/v in both HP line closed ] AND Both HPBP v/v closed (<2%) |
| 1.5.3) TURBINE IP V/V & LPBP CLOSED1) [ Either IP Stop valve OR IP Control v/v in both IP line closed ] AND [ Either LPBP stop v/v OR LPBP control v/v in both LPBP line closed]1.5.4) GENERATOR CB OPENED1) Gen CB 3CB001 close to open AND Gen CB 3CB002 open 2) Gen CB 3CB002 close to open AND Gen CB 3CB001open2. UNIT PURGE LOGIC1) All PA Fans OFF AND HOTV closed AND All Elevations all HONV closed AND LOTV closed AND All Elevations all LONV closed AND All Feeders OFF AND All Hot air gates closed AND All Elevations disc scanner no flame AND All Elevations fireball scanners no flame AND All aux air damper modulating AND [Total Air Flow>30%(>540tph) AND <40%(<720tph)] AND No Boiler Trip AND All MFT DPU outputs not frozen |
| 3. OIL ELEVATION 3.1) CORNER STARTRELEASE1) Elevation start permit AND LGM switch in remote AND Oil gun engaged AND Scavenge valve closed AND Manual isolating v/v open3.2) ELEVATION START PERMIT1) LO select from APS 2) Lo selected AND LO elevation start permit 3) HO select From APS 4) HO selected AND HO elevation start permit3.3) MANUAL ISOLATING VALVE OPEN1) HO selected AND HO manual isolating v/v open AND atomizing steam manual isolating v/v open 2) LO selected AND LO manual isolating v/v open AND Atomizing air manual isolating v/v open3.4) OILGUN ENGAGED PERMISSIVE1) Associated corner nozzle valve not closed AND Corner atom. air/ steam manual isolation v/v open AND Local oil gun maintenance switch in remote |
| 4. LOTV 4.1) OPENING PERMISSIVES1) NO MFT AND Elev. AB all LONV closed AND LO supply pressure >14 ksc AND No protection closing conditions present AND 24 V dc power available(H/W)4.2) PROTECTION CLOSING CONDITIONS: 1) LO header pressure<3.0ksc 2/3 TD5s AND Elev. AB any LONV not closed AND LOTV not closed 2) MFT operated AND LOTV not closed 3) Atomizing air pressure <3.5ksc 2/3TD5s AND Elev. AB any LONV not closed AND No LO start/stop in elev AB AND LOTV not closed 4) Loss of 24 V dc power (H/W)5. LO ELEVATION5.1) LO ELEVATION START PERMIT1) No MFT AND LOTV fully open AND Pulv / oil elev. Start permit available AND Any LFO line between LOTV & LONV through 5.1.1) PULV/ OILELEV. STARTPERMIT 1) No MFT AND [Any oil elev. In service OR Any feeder ON OR [Burner tilt horizontal AND airflow<40%]] |
| 5.2) LO ELEVATION TRIP CONDITIONS: 1) MFT operated 2) LOTV not opened 3) Any LFO line between LOTV & LONV not through5.3) ANY LFO LINE BETWEEN LOTV & LONV THROUGH1) LOFCV23A> 2% open AND LFO isolation v/v before FCV open 2) LOFCV23B> 2% open AND LFO isolation v/v before FCV open6. LO CORNER STARTUP SEQUENCE 6.1) RELEASE LO CORNER STARTUP SEQUENCE1) Elevation start permit AND LGM switch in remote AND Oil gun engaged AND Scavenge valve closed AND Atomizing air isolating v/v open AND LO manual isolating v/v open AND LO selected AND Pair stop time expired(375s)6.2) LO CORNER STARTUP SEQUENCESequence step 101 : Command: Open atomizing air nozzle v/v Feedback: Atomizing air nozzle v/v opened Sequencestep102: Command: Advance HEA rod Feedback: HEA rod advanced |
| Sequencestep103: Command: Open LONV AND HEA igniter spark Feedback: LONV open AND HEA rod retracted AND Disc scanner flame Sequencestep104: Command: Start up complete7. LO CORNER SHUTDOWN SEQUENCE 7.1) RELEASE LO CORNER SHUTDOWN SEQUENCE1) LO selected AND [ [ Both HONV AND LONV closed ] OR LGM switch in scavenge]]7.2) LO CORNER SHUTDOWN SEQUENCESequencestep201: Command: Close LONV Feedback: LONV closed Sequencestep202: Command: Open atomizing air nozzle v/v Feedback: Atomizing air nozzle v/v opened Sequencestep203: Command: Open Scavenge v/v AND Advance HEA rod Feedback: Scavenge complete (5 min) |
| Sequencestep204: Command: Close Scavenge v/v AND Close atomizing air nozzle v/v Feedback: Scavenge v/v closed AND Atom air nozzle v/v closed AND AC power available Sequencestep205: Command: Shut down complete7.3) LO CORNER RESET SEQUENCESequencestep501: HO selected Any step time out8. ATOMISING AIR NOZZLE VALVE 8.1) RELEASE OPEN1) LO manual isolating v/v open 8.2) RELEASE CLOSE1) LONV closed8.3) AUTO OPEN1) Command from Startup sequence step# 101 2) Command from Shutdown sequence step# 2028.4) AUTO CLOSE1) Command from Shutdown sequence step# 202 2) MFT 8.5) PROTECTION CLOSE1) Light Oil corner trip |
| 8.5.1) LIGHT OIL CORNER TRIP1) Atomizing air manual isolating v/v not open 2) LO manual isolating v/v not open 3) Elevation AB HO selected 4) Elevation AB backup trip 5) LGM in OFF 6) Oil gun not engaged 7) LO corner start time expired( 70s) AND No scavenge AND [ Scanner show no flame OR LONV not open OR Atom air nozzle v/v not open ] 9. LO NOZZLE VALVE 9.1) RELEASE OPEN1) Atomizing air nozzle v/v open9.2) AUTO OPEN1) Command from Startup sequence step# 1039.3) AUTO CLOSE1) Command from Shutdown sequence step# 201 2) MFT 9.4) PROTECTION CLOSE1) Light Oil corner trip 2) Scavenge v/v open 3) Any LONV not closed for 10 s AND No flame |
| 10. HOTV 10.1) OPENING PERMISSIVE1) No MFT AND a) All elev. HONV closed AND b) HO supply pressure > 16ksc AND c) HO supply temperature > 120degc AND d) No HOTV protection close AND e) 24V dc power supply available(H/W) 2) HORV open AND 24V dc power supply available(H/W)10.2) HOTV PROTECTION CLOSE1) MFT operated AND HOTV not closed 2) Auto closing conditions AND HOTV not closed TD5s10.3) AUTO CLOSING CONDITIONS1) Any HONV not closed AND HO header temp very low(<105degc) 2/3 2) Any HONV not closed AND HO header press very low(<3.75ksc) 2/3 3) Any HONV not closed AND Atoms team press very low (<2.5 ksc) 2/3 AND No HO start /stop in any elev. |
| 11. HO LONG RECIRCULATION VALVE11.1) OPEN PERMISSIVE1) All elev. nozzle v/v closed AND No MFT operated11.2) PROTECTION OPEN1) All elev. all HONV closed AND Any feeder proven11.3) PROTECTION CLOSE1) Any elev. nozzle v/v not closed 2) MFT operated12. HO SHORT RECIRCULATION VALVE12.1) AUTO OPEN 1) HOTV not open12.2) CLOSE TRIP(upto10% opening) 1) HOTV open 13. HFO ISOLATING VALVE BEFORE CONTROL V/V13.1) OPEN PERMISSIVE1) Corresponding HO FCV 33 >2% open AND Isolating v/v closed13.2) CLOSE PERMISSIVE1) CorrespondingHOFCV33 <2% open AND Isolating v/v open |
| 14. HO ELEVATION14.1) HO ELEVATION START PERMIT1) Pulv / oil elev. Start permit AND No heavy oil elev. Trip AND Any HFO line between HOTV & HONV through14.1.1) PULV/OIL ELEV. START PERMIT1) No MFT AND [Any oil elev. In service OR Any feeder ON OR [Burner tilt horizontal AND airflow<40%(<720tph)]]14.1.2) NO HEAVY OIL ELEV TRIP1) HOTV open AND No MFT AND [ All elev. all HONV not closed OR [ HO supply pressure > 16 ksc AND HO supply temp > 120 degc ] ] 14.1.3) ANY HFO LINE BETWEEN HOTV & HONV THROUGH1) HOFCV33A>2% open AND Isolating valve before HO FCV33Aopen 2) HOFCV 33B>2% open AND Isolating valve before HOFCV 33B open 3) Bypass line inching valve HO41D open AND Isolating valve before HO41D open |
| 14.2) HO ELEVATION TRIP CONDITIONS1) MFT operated 2) HOTV not open 3) Any HFO line between HOTV& HONV not through15. HO CORNER STARTUP SEQUENCE15.1) RELEASE HO CORNER STARTUP SEQUENCEa) Elevation start permit b) LGM switch in remote c) Oil gun engaged d) Scavenge valve closed e) Atomizing steam isolating v/v open f) HO manual isolating v/v open g) HO selected Pair stop time expired(375s)15.2) HO CORNER STARTUP SEQUENCESequence step 101 : Command: Open atomizing steam nozzle v/v Feedback : Atomizing steam nozzle v/v opened Sequencestep102: Command: Advance HEA rod Feedback: HEA rod advanced Sequencestep103: Command: Open HONV AND HEA igniter spark Feedback: HONV open AND HEA rod retracted AND Disc scanner flame Sequencestep104: Command: Startup complete |
| 16. HO CORNER SHUTDOWN SEQUENCE16.1) RELEASE HO CORNER SHUTDOWN SEQUENCE1) HO selected AND [ [ Both HONV AND LONV closed ] OR LGM switch in scavenge ]16.2) HO CORNER SHUTDOWN SEQUENCESequencestep201: Command :Close HONV Feedback: HONV closed Sequencestep202: Command: Open atomizing steam nozzle v/v Feedback: Atomizing steam nozzle v/v opened Sequencestep203: Command: Open Scavenge v/v AND Advance HEA rod Feedback: Scavenge complete Sequencestep204: Command: Close Scavenge v/v AND Close atomizing steam nozzle v/v Feedback: Scavenge v/v closed AND Atom steam nozzle v/v closed AND AC power available Sequencestep205: Command :Shutdown complete |
| 17. ATOM. STEAM NOZZLE VALVE17.1) RELEASE OPEN1) HO manual isolating v/v open17.2) RELEASE CLOSE1) HONV closed17.3) AUTO OPEN1) Command from Startup sequence step# 101 2) Command from Shutdown sequence step# 20217.4) AUTO CLOSE1) Command from Shutdown sequence step# 202 2) MFT17.5) PROTECTION CLOSE1) Heavy Oil corner trip17.5.1) HEAVY OIL CORNER TRIP1) Atomizing steam manual isolating v/v not open 2) HO manual isolating v/v not open 3) Elev. AB LO selected 4) Pair back up trip 5) LG Min OFF 6) Oil gun not engaged 7) HO corner start time expired(70s) AND No scavenge AND [Scanner show no flame OR HONV not open OR Atom steam nozzle v/v not open] |
| 18. HO NOZZLE VALVE18.1) RELEASE OPEN1) Atomizing steam nozzle v/v open18.2) AUTO OPEN1) Command from Start up sequence step# 10318.3) AUTO CLOSE1) Command from Shutdown sequence step# 201 2) MFT18.4) PROTECTION CLOSE1) Heavy Oil corner trip 2) Scavenge v/v open 3) Any HONV not closed for 10s AND No flame19. SCAVANGE NOZZLE VALVE19.1) RELEASE OPEN1) Oil nozzle v/v closed AND Atomizing nozzle v/v open19.2) AUTO OPEN1) Command from Shut down sequence step# 20319.3) AUTO CLOSE1) Command from Shut down sequence step# 20419.4) PROTECTION CLOSE1) LGM switch OFF 2) Oil gun not engaged 3) Pair back up trip |
| 20. MILL20.1) MILL START PERMISSIVE1. SA header / mill bowl DP > 250 mmwc 2. Mill motor swgr available 3. Mill OFF 4. Ignition permit available 5. No mill unsuccessful elev. start 6. Bunker outlet gate open 7. Feeder inlet gate open 8. Mill discharge v/v open 9. Mill start permit from PLOS 10. Mill outlet temp < 90 degc 11. CAG open Trampiron hopper v/v open 12. Mill/ feeder start permit No mill trip Primary air permit 13. All burner isolation gates open EPB not pressed20.2)MILL START PERMIT FROM PLOSi. Any LOP ON AND b. Sump / Lube oil temp < 80 degc AND c. LOP discharge press > 3.5ksc AND d. LO filter DP < 1.5 ksc AND e. Sump oil level adequate (10mm below CL) ANDii. Lub oil pressure > 3ksc |
| 20.3) MILL/ FEEDER START PERMIT1) No MFT AND [ Any oil elev. in service OR Any feeder ON OR [ Airflow<40% AND burner tilt horizontal]]20.4) MILL PROTECTIONS1) Motor winding temp very high(>130degc) TD5s 2) Motor bearing temp very high(>90degc) TD5s 3) Mill bearing temp very high(>90degc) TD5s 4) Mill vibration very high(>15mm/s) TD15s 5) Mill trip from PLOS 6) Mill H/W trip from MCC 7) [ Mill ON AND SA header/ bowl DP low](<200mmwc) TD1m 8) MFT operated 9) [ Mill ignition support required AND permit N/A] 10) Mill discharge v/v not open 11) Any burner isolating gates not open 12) Loss of primary air 13) Unit runback 14) EPB pressed 15) Loss of elev. 24vpower supply (H/W)20.5) MILL TRIP FROM PLOS1) Mill ON AND LO temp high(>80degc) TD60m 2) Mill ON AND both LOP OFF TD2s 3) LO press very low(<3ksc) AND LOP in serviceTD10s 4) LO level very low TD10s |
| 20.6) LOSS OF PRIMARY AIR1) PA header press very low(< 500mmwc) 2/3 2) [[ Both PA fans OFFOR Both FD fans OFF] AND Any mill ON ] 3) PA header press low(< 625mmwc) TD1m20.7) UNIT RUN BACK1) 5or more mill ON AND [ Unit runback conditions OR PA header press lowTD5s] Applicable to mills K,J,H,G,F,E progressive time delay for 2sec starting from top running mill for which trip is instantaneous20.7.1) UNIT RUNBACK CONDITIONS1) One FD fan OFF TD1s 2) One ID fan OFF TD1s 3) One PA fan OFF TD1s 4) 2 out of 3BCWOFF TD15s 5) 2out of 3 BFP OFF TD5s 6) 2 out of 3CEP OFF TD15s 7) One SAH OFF TD30s 8) One PAH OFF TD30s 9) Turbine Trip TD1s 10) LSR operated TD1s 20.8) MILL IGNITION PERMIT(for Mill A) 1) ¾ AB elev. nozzle valve open 2) Boiler loading>30% AND Feeder B in service at>50% loading( 41tph) |
| 21. MILL LOP21.1) START PERMISSIVE1) LO level adequate AND No LO trip command21.2) STOP PERMISSIVE1) Mill OFF for>5m21.3) AUTO START1) Other LOP running for 1m AND LO press < 3.5ksc 2) Other LOP failed to start TD5s21.4) PROTECTION STOP1) Other LOP running for 1m AND LO press < 3ksc 2) LO tank level low22. MILL HOT AIR DAMPER22.1) AUTO CLOSE1) Hot air gate close command 22.2) TRIP TO MANUAL1) Mill air flow signal bad 2) No release to auto 22.3) RELEASE TO AUTO1) Mill ON AND Mill outlet temp < 90 degc AND HAG open AND HAG no close command persists
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| 23.3) HAG CLOSING CONDITIONS1) [ HAG not closed OR Mill outlet temp>100degc] AND [ Mill outlet temp > 100 degc OR Mill unsuccessful start OR Feeder trip ]24. MILL COLD AIR DAMPER24.1) AUTO CLOSE1) Mill OFF AND [ MFT not operated AND Any PA fan start pulse] 24.2) AUTO OPEN1) MFT operated for more than 5 min 2) Mill ON AND HAG closed24.3) TRIPTOMANUAL1) Mill outlet temp signal bad 2) No release to auto24.4) RELEASE TO AUTO1) Mill ON AND Mill outlet temp < 90 degc AND HAG open AND HAG no close command persists25. MILL COLD AIR GATE25.1) AUTO OPEN 1) CAG closed AND [ HAG protection close OR |
| [ Mill ON AND Mill outlet temp > 65 degc] ]25.1) CLOSE PERMISSIVES 1) MILLOFF 25.1) PROTECTIONCLOSE1) CAG not closed AND Mill ON AND Mill outlet temp < 60 degc |
| 26. RAW COAL FEEDER26.1) START PERMISSIVES1) Feeder switch in remote AND MFT not acted AND Mill ON AND Feeder seal air v/v open AND Mill ready AND Feeder speed minimum AND Feeder o/l gate open AND [ Mill ignition permit available OR Mill ignition support not required]26.2) TRIP PROTECTIONS1) Feeder switch not in remote 2) MFT operated 3) Mill OFF 4) Feeder ON for>5s AND No coal ON belt AND Mill motor current low 5) Mill ignition permit N/A AND Ignition support required27. SADC27.1) AUX AIR DAMPER OPENING CONDITION( applicable to AB,BC,CD,DE,EF,FG,GH,HJ,JK,KK) 1) Open command from FSSS 2) Furnace to wind box DP high (>240mmwc) |
| 27.1.1) OPEN command from FSSS is issued if1) MFT operated 2) Both ID fans OFF 3) Both FD fans OFF 4) Loss of 24 V dc27.2) AUX AIR DAMPER CLOSING CONDITION1) Associated Mills OFF AND Associated oil elevations OFF AND Purge over AND No MFT Once the boiler load increased above 30 % , the aux air dampers close in a timed sequence starting from top with a time delay of 10 sec provided all closing conditions are satisfied27.3) FUELAIRDAMPER(A-K)& OFADAMPEROPEN CONDITION1) MFT operated 2) Both ID fans OFF 3) Both FD fans OFF 4) Loss of 24 V dc Once the post purge time (5min) has expired AND No Opening conditions exist, the opening command is Removed for fuel air dampers F-J. After a time delay Of 30 sec opening command is removed for fuel air Dampers A-E. The close command is extended with a time delay of 50 sec after the corresponding feeder is out of service |
| 28. HPBP SYSTEM28.1) BP VALVE FAST OPENCONDITION1) Turbine trip AND No priority close AND Boiler ON 2) Generator breakerD11open AND No priority close AND Boiler ON 3) TurbineLSRD12ON AND No priority close AND Boiler ON 4) Emergency Fast open PB pressed AND No priority close AND Boiler ON 5) Pressure deviation too high(>8ksc) AND No priority close AND Boiler ON 6) Re-heater protection active AND No priority close AND Boiler ON28.2) BP VALVE PRIORITY CLOSE CONDITION1) Condenser vacuum low (<-0.6ksc) 2) Bypass downstream steam temp very high (>380degc)28.3) BP VALVE AUTO BLOCKING CONDITION1) BP v/v priority close command 2) BP v/v position transmitter failed 3) OSU-1ANDOSU-2oilpress< 90ksc 4) Main steam line pr. Transmitter disturbed28.4) BD VALVE AUTO OPEN CONDITION1) BP-1v/v>2% open 2) BP-2v/v>2% open28.5) BD VALVE AUTO CLOSE CONDITION1) BP-1 AND BP-2 v/v <2% open |
| 28.6) BPE VALVE AUTO BLOCKING CONDITION1) BPE downstream temp very high(>380degc) 2) BPE v/v position transmitter failed 3) Corresponding BP auto command blocking 4) BPE temp transmitter deviation high28.7) BPE VALVE SWITCH OVERTO AUTO1) BP v/v>2% open28.8) BPE VALVE FAST CLOSE CONDITION1) BP v/v<2% open29. OIL SUPPLY PUMP FOR HPBP29.1) PUMP AUTO OFF1) Oil pressure high(>160ksc)29.2) PUMP AUTO ON1) Oil pressure low (<120ksc)Alarms:1) Pressure too high>170ksc 2) Pressure too low <90ksc30. SCANNER AIR FAN30.1) AUTOON 1) No MFT ANDScan duct to furnace DP low (<150mmwc) TD5s30.2) RELEASE OFF1) [ MFT operated OR Scan duct to furnace DP >150mmwc] AND [ Both scanner fan running OR [ MFTAND Any scanner fan ON ] ] |
| 31. SCANNER AIR FAN OUTLET DAMPER31.1) SCANNER FAN OUTLET DAMPER OPEN1) Outlet damper closed AND Scanner air fan ON31.2) SCANNER FAN OUTLET DAMPER CLOSE1) Outlet damper open AND Scanner air fan OFF32. SEAL AIR FAN32.1) AUTO START1) Any PA fan ON AND Sec air header/ Cold PA header DP<125mmwc TD10s 2) Other seal air fan trips32.2) PROTECTION OFF1) Both fan started TD10s 2) Both PA fans OFF TD15s32.3) RELEASE OFF1) Both fan running AND Sec air hdr/ Cold PA hdr DP >125mmwc32.4) START PERMISSIVE1) O/l damper closed33. SEAL AIR FAN OUTLET DAMPER33.1) SEAL AIR FAN OUTLET DAMPER OPEN1) Outlet damper closed AND Seal air fan ON33.2) SEAL AIR FAN OUTLET DAMPER CLOSE1) Outlet damper open AND Seal air fan OFF |
| 34. ID FAN34.1) VFD CHANNEL-1 DRIVE START PERMISSIVES 1. Ch-1Source breaker not disturbed 2. Ch-1Source breaker ON 3. VFDCh-1 no Alarm 4. VFDCh-1 Ready 5. VFDCh-1Start Permissive available 6. VFDCh-1NoFault 7. [[ Reg Damper Pos Min AND Both inlet gates closed 8. AND Both outlet gates closed] 9. OR ID Fan VFD Ch-2 ON] 10. Any LOP ON 11. ID Fan Exciter Winding temp < 100degc 12. Lube oil pressure > 0.8ksc 13. Fan/motor bearing temp < 85 degc 14. Motor winding temp < 125 degc 15. VFD System Aux Supply OK 16. Lube oil temp at cooler outlet < 50 degc 17. Lube oil tank level not low 18. [ Flue gas path available OR Other IDF an ON]34.2) VFD CHANNEL-2 DRIVE START PERMISSIVES1. Ch-2 Source breaker not disturbed 2. Ch-2 Source breaker ON 3. VFD Ch-2 no Alarm 4. VFD Ch-2Ready 5. VFD Ch-2StartPermissiveavailable 6. VFD Ch-2NoFault 7. [[ Reg Damper Pos Min AND Both inlet gates closed AND Both outlet gates closed |
| OR ID Fan VFD Ch-1 ON] 8. Any LOP ON AND 9. ID Fan Exciter Winding temp < 100degc 10. Lub oil pressure > 0.8ksc 11. Fan/ motor bearing temp < 85degc 12. Motor winding temp < 125 degc 13. VFD System Aux Supply OK 14. Lub oil temp at cooler outlet < 70 degc 15. Lub oil tank level not low 16. [ Flue gas path available OR Other ID Fan ON]34.2.1) FLUE GAS PATH AVAILABLE1) Any ESP path available AND Any FD fan path available AND [ Any SAH AND Corresponding SCAPH path available] AND All aux air dampers modulating34.2.2) FD FAN PATH AVAILABLE1) FD fan o/l gate open AND Blade pitch position >95%34.2.3) SAH AVAILABLE1) [ SAH electric motor ON AND Air path available AND FG available] AND No SAH fire AND No SAH rotor stopped34.2.4) SCAPH PATH AVAILABLE1) [ SA SCAPH i/l isolating damper open AND SA SCAPH o/l isolating damper open] 2) SA SCAPH bypass damper open |
| 34.3) VFD CHANNEL-1 TRIPPROTECTIONS1) VFDCh-1Fault 2) Ch-1Sourcebreakerelectricaltrip 3) Fan/ motor bearing temp very high(> 90degc) 4) Motor winding temp very high (> 130 degc) 5) Fan/mtr bearing Vibration very high(> 10mm/s) TD15s 6) Exciter winding temp very high (> 105 degc) 7) ID Fan Post Purge trip 8) ID Fan ON* for 2.5 min AND Both outlet gate closed 9) ID Fan ON* for 2.5 min AND Both inlet gate closed 10) Both ID fan ON AND Both FD fan ON AND Corresponding FD trip *VFD Ch-1or 2 min speed achieved34.4) VFD CHANNEL-2 TRIP PROTECTIONS1) VFD Ch-2Fault 2) Ch-2Source breaker electrical trip 3) Fan/ motor bearing temp very high(> 90degc) 4) Motor winding temp very high (> 130 degc) 5) Fan/mtr bearing Vibration very high(> 10mm/s) TD15s 6) Exciter winding temp very high (> 105 degc) 7) ID Fan Post Purge trip 8) ID Fan ON* for 2.5 min AND Both outlet gate closed 9) ID Fan ON* for 2.5 min AND Both inlet gate closed 10) Both ID fan ON AND Both FD fan ON AND Corresponding FD trip *VFDCh-1or2min speed ( 90rpm) achieved |
| 34.4.1) ID FAN POST PURGE TRIP1) Boiler tripped, purged but not lighted up for 5 min AND Airflow> 30%(> 540tph) AND [ Furnace press Very high (> 150mmwc) OR Furnace press Very low ( < -175 mmwc) ]34.5) VFD CH-1 AUTO START1) Command from sequence step# 10534.6) VFD CH-2 AUTO START1) Command from sequence step# 10634.7) VFD CH-1 AUTO STOP1) Ch-1 Source breaker change from ON to OFF 2) Command from sequence step# 20134.8) VFD CH-2 AUTO STOP1) Ch-2Source breaker change from ON to OFF 2) Command from sequence step# 20134.9) VFD CH-1 SOURCE BREAKER START PERMISSIVE1. Ch-1 source breaker switch gear available 2. Ch-1 source breaker not disturbed 3. Ch-1source breaker close permissive available from VFD34.10) VFD CH-2 SOURCE BREAKER START PERMISSIVE1. Ch-2sourcebreakerswitchgearavailable AND 2. Ch-2 source breaker not disturbed AND 3. Ch-2sourcebreakerclosepermisiveavailablefromVFD34.11) VFD CH-1 SOURCE BREAKER PROTECTION1) Ch-1 SRC Breaker trip command from VFD |
| 34.12) VFD CH-2 SOURCE BREAKER PROTECTION1) Ch-2 SRC Breaker trip command from VFD34.13) VFD CH-1/2 SOURCE BREAKER AUTO ON1) Command from sequence step# 10335. ID FAN LOP35.1) START PERMISSIVES1) Lub Oil Tank Level not low35.2) AUTO START1) ID fan ON AND Other LOP ON to OFF 2) ID Fan LOP Group Control Selected AND Other LOP tripped 3) Other LOP ON AND Lub oil press.< 0.6kscTD10s35.3) STOP RELEASE1) ID Fan OFF for 30min 2) Other LOP ON AND Lub oil press > 0.8 ksc35.4) AUTO STOP1) ID Fan OFF for 30min 2) Command from sequence step# 20536. ID FAN INLET GATE 1,236.1) PROTECTIONOPEN 1) Both ID Fans OFF |
| 36.2) OPEN RELEASE1) Fan OFF AND Other Fan ON Condition not present36.3) AUTO OPEN1) ID Fan ON for10sec 2) Command from ID fan startup sequence step# 107 3) Command from ID fan shutdown sequence step# 203 AND other ID fan not ON 4) Command from other ID fan shutdown sequence step# 203 AND ID fan not ON36.4) CLOSE RELEASE1) Fan OFF36.5) AUTOCLOSE1) Fan OFF AND Other Fan ON 2) Command from ID fan start up sequence step# 102 3) Other ID fan not OFF AND Command from ID fan shutdown sequence step# 202 4) ID fan not ON AND Command from other ID fan startup sequence step# 10837. ID FAN OUTLET GATE 1,2 37.1) PROTECTION OPEN1) Both ID Fans OFF37.2) OPEN RELEASE1) Fan OFF AND Other Fan ON condition not present 37.3) AUTO OPEN 1) ID Fan ON for 10sec |
| 2) Command from ID fan startup sequence step# 107 3) Command from ID fan shutdown sequence step# 203 AND Other ID fan not ON 4) Cmd from other ID fan shutdown seq step# 203 AND ID fan not ON37.4) CLOSE RELEASE1) Fan OFF37.5) AUTO CLOSE1) Fan OFF AND Other Fan ON 2) Command from ID fan startup sequence step# 102 3) Other ID fan not OFF AND Command from ID fan shutdown sequence step# 202 4) ID fan not ON AND Command from other ID fan startup sequence step# 10838. ID FAN O/L GATE BLOWER 1,238.1) AUTO ON1) Other blower ON AND Outlet damper SA press. low 2) Any ID fan ON AND Other blower tripped38.2) OFF RELEASE1) Both ID Fans OFF OR Other blower ON38.3) AUTO OFF1) Both ID fan OFF TD2m 2) Command from ID fan shutdown seq step# 204 3) Command from other ID fan shutdown seq step# 204 |
| 38.4) BLOWER KNIFE GATE AUTO ON1) Any o/l gate blower ON for 3 sec 2) Open command from sequence step# 10138.5) BLOWER KNIFE GATE AUTO OFF1) Both o/l gate blower OFF for 3 sec39. ID FAN INLET GUIDE VANE39.1) AUTO CLOSE1) No MFT AND Furnace pressure< 75mmwc 2/3 AND Corresponding ID fan OFF AND Other ID fan ON39.2) AUTO OPEN1) MFT operated AND Both ID fans OFF AND Furnace Press not low>-100mmwc39.3) TRIP TO MANUAL1) Feedback deviation high 2) Feedback quality bad 3) MFT operated 4) No release to auto39.4) RELEASE TO AUTO
|
| 40. FD FAN40.1) FD FAN DRIVE START PERMISSIVES1. Motor winding Temperature < 120degc 2. Fan/ motor bearing temperature < 95 degc 3. Lube oil pressure > 0.8ksc 4. Control oil pressure > 8 ksc 5. Lube oil cooler outlet temp < 70 degc 6. Any LOP ON 7. Lube oil tank level not low 8. [Impeller position min(<2%) AND manual] 9. Fan outlet gate closed 10. Switch gear available Switch gear not disturbed 11. FG path available 12. EPB not pressed40.1.1) FG PATH AVAILABLE1. [ Both ID Fans Through OR [ Any ID Fan Through AND Other FD Fan OFF]]40.1.2) ID FAN THROUGH |
| Both I/L gates open AND Both O/L gates open ID Fan ON40.2) FD FAN TRIP PROTECTIONS1. FD Fan Post purge Trip 2. Fan/ motor bearing temperature very high(> 105degc)3. Motor winding temperature very high (> 140degc |
| position minimum]] | Both I/L gates open AND Both O/L gates open ID Fan ON40.2) FD FAN TRIP PROTECTIONS1. FD Fan Post purge Trip 2. Fan/ motor bearing temperature very high(> 105degc)3. Motor winding temperature very high (> 140degc |
| 1. Fan/ mtr bearing vibration very high(> 10mm/s)TD15s 2. Both ID Fans OFF 3. Both FD Fans ON AND Corresponding ID fan OFF 4. FD Fan ON for 2min AND o/l gate closed 5. Electrical Protection acted40.3) FD FAN AUTO ON1) Command from FD fan Startup Sequence step# 10440.4) FD FAN AUTO OFF1) Command from FD fan Shutdown Sequence step# 20141. FD FAN LOP41.1) START PERMISSIVES1) Lube Oil Tank level not low41.2) AUTOSTART1) FD fan ON AND Other LOP ON to OFF 2) FD fan ON AND [ Lub oil press < 0.6 ksc OR Control oil press < 5 ksc ] 3) FD fan LOP Group Control Selected AND Other LOP tripped41.3) STOP RELEASE1) FD Fan OFF for 30min 2) Other LOP ON AND Lub oil press > 0.8ksc AND Control oil press > 8 ksc41.4) AUTO STOP1) FD Fan OFF for 30min 2) Command from sequence step# 204 |
| 42. FD FAN OUTLET GATE42.1) PROTECTION OPEN1) Both FD Fans OFF for15min42.2) AUTO OPEN1) FD Fan ON for 10sec42.3) AUTO CLOSE1) FD Fan OFF AND [ Other FD Fan ON AND Its outlet gate Open]42.4) CLOSE PERMISSIVE1) FD Fan OFF43. FD FAN BLADE PITCH43.1) AUTO CLOSE1. Corresponding FD fan OFF 2. Other FD fan ON AND Its outlet gate open 3. Control oil press not low >6 ksc 4. Furnace press not low 5. No MFT 6. [ Control damper in manual OR position>5%]43.2) AUTO OPEN1. FD fan OFF 2. Control oil press not low 3. Furnace press not high 4. [ Air to fuel ratio not ok OR Both FD fans OFF ]5. No MFT6. [ Control damper in manual OR position<75%] |
| 42. FD FAN OUTLET GATE42.1) PROTECTION OPEN1) Both FD Fans OFF for15min42.2) AUTO OPEN1) FD Fan ON for 10sec42.3) AUTO CLOSE1) FD Fan OFF AND [ Other FD Fan ON AND Its outlet gate Open]42.4) CLOSE PERMISSIVE1) FD Fan OFF 43. FD FAN BLADE PITCH43.1) AUTO CLOSE1. Corresponding FD fan OFF 2. Other FD fan ON AND Its outlet gate open 3. Control oil press not low >6 ksc 4. Furnace press not low 5. No MFT 6. [ Control damper in manual OR position>5%]43.2) AUTO OPEN1. FD fan OFF AND Control oil press not low 2. Furnace press not high 3. [ Air to fuel ratio not ok OR Both FD fans OFF ] 4. No MFT5. [ Control damper in manual OR position<75% |
| 43.3) TRIP TO MANUAL1) MFT operated 2) Control oil pressure low (< 6 bar) 3) Air to fuel ratio not ok 4) No release to auto43.4) RELEASE TO AUTO1. Auto open command from SGC logic 2. Corresponding FD fan ON AND 3. [ Other FD fan ON OR [ Other FD fan OFF AND outlet gate closed ] ]44. PA FAN44.1) PA FAN DRIVE START PERMISSIVES1. Motor winding temperature < 125degc 2. Fan/ motor bearing temperature < 85degc 3. Lube oil pressure > 0.8ksc 4. Control oil pressure > 8 ksc 5. Lube oil cooler outlet temp < 70 degc 6. Any LOP ON 7. Lube oil tank level not low 8. [Impeller position min(<2%) AND manual] 9. Fan outlet gate closed Switchgear available Switchgear not disturbed 10. [ Both FD Fans ON OR [ Any FD Fan ON Other PAFan OFF]] |
| 11. Start permissive from FSSS ( All CAG closed ) 12. [ Both PAH ON AND air path available] OR [ Any PAH ON AND Air path available AND other PA fan OFF]44.2) PA FAN TRIP PROTECTIONS1. MFT operated 2. Fan/ motor bearing temperature very high(> 90degc) 3. Motor winding temperature very high(> 130degc) 4. Fan/mtr bearing vibration very high(>10mm/s) TD15s 5. Both FD Fans OFF 6. PA Fan ON for 2min AND Outlet gate closed 7. Electrical Protection acted45. PA FAN LOP45.1) START PERMISSIVES1) Lub Oil Tank level not low45.2) AUTO START1) PA fan ON AND Other LOP On to OFF 2) PA fan ON AND [ Lub oil press < 0.6 ksc OR Control oil pressure < 5 ksc ] 3) PA fan LOP Group Control Selected AND Other LOP tripped45.3) STOP RELEASE1) PA Fan OFF for 30min 2) Other LOP ON AND Lub oil press.> 0.8ksc AND Control oil press. > 8 ksc45.4) AUTOSTOP1) PA Fan OFF for 30 min 2) Command from sequence step# 204 |
| 48. BCW P/P48.1) START PERMISSIVES1. Pump protection criteria not present 2. LP cooling water flow > 1.26 lps 3. Pump casing to suction manifold DT< 38 degc 4. Motor Cavity temp >2 degc & < 63 degc 5. Discharge Valve Stem-1 open 6. Discharge Valve Stem-2 open 7. Switchgear available 8. Boiler drum vent valves closed 9. Switchgear not disturbed 10. CW supply to BCW pumps normal48.1.1) BOILER DRUM VENT VALVES CLOSED1. Drum N2 fill v/v B3 closed 2. Drum N2 fill v/v B4 closed 3. Drum N2 fill v/v B5 closed 4. Drum N2 fill v/v B6 closed48.1.2) CW SUPPLY TO BCW PUMPS1) BCW EMG CW tank level not low48.2) TRIP PROTECTION1) Motor Cavity temp very high ( > 66 degc) 2) Discharge Valve Stem-1 not open 3) Discharge Valve Stem-2 not open 4) Electrical Protection acted |
| 48.3) AUTO START(in standby selection): 1) Any other running BCW p/p tripped 2) Any other BCW p/p ON for 30sec AND DP low TD5s49. BCW CW BOOSTER PUMP 49.1) AUTOSTART1) Other running booster pump tripped 2) Other booster pump ON AND discharge press < 3ksc 3) Overhead tank level low49.2) AUTO OFF1) Overhead tank level high50. SAH ELECTRIC MOTOR50.1) START PERMISSIVES1. SAH GB oil temp < 70 degc 2. SAH SB oil temp < 70 degc 3. MCC not disturbed50.2) AUTO ON1) Command from SAH Startup Sequence step# 10450.3) AUTO OFF1) Command from SAH Shutdown Sequence step# 205 |
| 51. SAH AIR MOTOR51.1) START PERMISSIVES1. SAH GB oil temp < 70 degc 2. SAH SB oil temp< 70degc 3. SAH Elect Motor OFF51.2) AUTO ON1) SAH Elect Motor tripped51.3) AUTO OFF1. SAH Elect motor ON 2. SAH Elect motor not OFF 2) Command from SAH Shutdown Seq step# 20552. SAH GUIDE BRG LOP52.1) START PERMISSIVE1) GB oil temp> 40degc52.2) AUTO START1. SAH SGC Startup Sequence step# 102 2. SAH ON 3. [Other GB LOP ON for 30s GB Oil flow low ( < 3 lpm )] 4. GB oil temp> 40degc 5. SAH ON AND Other GB LOP ON to OFF AND 6. GB oil temp> 40degc52.2.1) SAH ON1) SAH electric motor ON 2) SAH air pr. after solenoid v/v not low (> 5 ksc ) |
| 52.3) AUTO STOP1) Command from SAH Shutdown Sequence step# 209 2) SAH GB Oil temp< 35degc53. SAH SUPPORT BRG LOP53.1) START PERMISSIVE1) SB oil temp > 35 degc53.2) AUTO ON1) SAH SGC Startup Sequence step# 101 2) SAH ON AND [Other SB LOP ON for 30s AND SB Oil flow Low ( < 7 lpm )] SB oil temp> 35degc 3) SAH ON AND Other SB LOP ON to OFF 4)SB oil temp> 35degc53.3) AUTO OFF1) Command from SAH Shutdown Sequence step# 209 2) SAH SB Oil temp < 30degc54. SAH AIR O/L DAMPER54.1) PROTECTION OPEN1) Corresponding SAH ON AND MFT operated TD5s54.2) AUTO OPEN1) Command from SGC Startup Sequence step# 105 2) Command from SGC Shutdown Sequence step# 20354.3) OPEN PERMISSIVE1) Corresponding SAH ON OR boiler not working |
| 54.4) AUTOCLOSE1) FG i/l damper closed 2) Command from Other SAH Startup seq step# 108 3) Command from SAH Shutdown seq step# 202 4) SAH OFF AND Other SAH ON TD 90s54.5) CLOSE PERMISSIVES1. Corresponding SAH FG i/l dampers closed 2. [[ Other SCAPH air path available AND Both other air O/L dampers opened] OR Both ID Fans OFF]54.5.1) SCAPH AIR PATH AVAILABLE1) SCAPH bypass damper open OR [ Inlet AND Outlet dampers open ]55. SAH AIR O/L DAMPER BLOWER 1,255.1) AUTO ON1) Other blower OFF AND Command from other SAH Startup Seqstep# 109 2) Other blower OFF AND Command from SAH Shutdown Seq step# 207 3) Other blower ON to OFF AND Both air O/L dampers closed AND Any SAH ON 4) Both air O/L dampers closed AND Any SAH ON AND Other blower OFF |
| 55.2) AUTO OFF1) Both SAH OFF 2) Command from SAH Startup Sequence Step# 107 3) Both air O/L dampers opened55.3) PROTECTION OFF1) Blower ON AND Knife Gate Closed55.4) BLOWER KNIFE GATE AUTO OPEN1) Any blower ON 2) Command from other SAH Startup Seq step# 109 3) Command from SAH Shutdown Seq step# 20755.5) BLOWER KNIFE GATE AUTO CLOSE1) Both Blowers OFF 2) Command from SAH Startup Sequence Step# 10756. SAH FG I/L FLAP DAMPER56.1) OPEN RELEASE1) SCAPH air path available AND Both SAH air O/L dampers open AND SAHON 2) Both SAH OFF56.2) AUTOOPEN1) Command from SAH Startup Seq step# 106 2) Command from SAH Shutdown Seq step# 203 56.3) PROTECTION OPEN 1) MFT Operated AND SAH ON TD5s |
| 56.4) CLOSE RELEASE1) Other SAH FG I/L damper opened AND Other SAH both FG outlet reg dampers not min AND Both RAPH outlet FG dampers open 2) Both ID Fans OFF56.5) AUTO CLOSE1) Command from other SAH Startup Seq step# 108 2) Command from SAH Shutdown Seq step# 201 3) SCAPH bypass damper closed AND Inlet damper AND Outlet damper closed 4) Both Air outlet dampers closed 5) SAH OFF AND Other SAH ON TD30s57. SAH FG I/L FLAP DAMPER BLOWER-1,257.1) AUTO ON1) Other blower ON AND Blowers inter space pr. low 2) Command from other SAH Startup Seq step# 110AND Other blower OFF 3) Command from SAH Shut down Seq step# 206 AND Other blower OFF 4) Any SAH ON AND FG inlet damper closed AND Other blower ON to OFF |
| 57.2) AUTOOFF1) Both SAH OFF 2) Command from SAH Startup Sequence Step# 107 3) FG I/L damper Opened57.3) PROTECTION OFF1) Blower ON AND Seal air v/v Closed TD15s57.4) I/L FLAP DAMPER SEAL AIR VALVE AUTO OPEN1) Any blower ON57.5) I/LFLAP DAMPER SEAL AIR VALVE AUTO CLOSE1) Both blowers OFF 2) Command from SAH Startup Sequence step# 10758. SAH FG O/L DAMPER58.1) AUTO CLOSE1) Corresponding SAH OFF AND Other SAH ON 2) Both air outlet dampers closed 3) [ SCAPH inlet OR outlet damper closed ] AND SCAPH bypass damper closed58.2) AUTO OPEN1) MFT operated AND SAHON58.3) TRIP TOMANUAL1) No release to auto |
| 58.4) RELEASE TO AUTO1) Command from sequence logic 2) Corresponding SAH ON AND FG inlet flap damper open AND No MFT AND Both RAPH outlet damper open AND Both air outlet dampers open AND [ [ SCAPH inlet AND outlet damper open] OR SCAPH bypass damper open]59. SA SCAPH I/L DAMPER59.1) AUTO OPEN1) Both SAH OFF 2) SA SCAPH in service 3) Command from Sequence step# 20259.2) AUTO CLOSE1) Command from sequence step# 20359.3) PROTECTION OPEN1) MFT operated60. SA SCAPH O/L DAMPER60.1) AUTO OPEN1) Both SAH OFF 2) SA SCAPH in service 3) Command from sequence step# 202 |
| 60.2) AUTO CLOSE1) Command from sequence step# 20360.3) PROTECTION OPEN1) MFT operated 61. SA SCAPH BYPASS DAMPER 61.1) PROTECTION OPEN 1) MFT operated61.2) AUTO OPEN1) SA SCAPH not in service 2) Command from SAH shutdown seq step# 20361.3) AUTO CLOSE1) SA SCAPH in service 2) Command from SAH shutdown seq step# 20262. PAH ELECTRIC MOTOR62.1) START PERMISSIVES 1) PAH GB oil temp< 70degc AND PAH SB oil temp < 70degc62.2) AUTO ON1) Command from PAH Startup Seq step# 10462.3) AUTO OFF1) Command from PAH Shutdown Seq step # 204 |
| 63. PAH AIR MOTOR63.1) START PERMISSIVES1. PAH GB oil temp < 70degc 2. PAH SB oil temp < 70degc 3. PAH Elect Motor OFF63.2) AUTO ON1) PAH Elect Motor tripped63.3) AUTO OFF1) PAH Elect Motor ON 2) Command from PAH Shutdown Sequence step# 21264. PAH GUIDE BRG LOP64.1) START PERMISSIVES1) GB oil temp high> 40degc64.2) AUTO ON1) Command from PAH Startup Seq step# 102 2) PAHON AND [ OtherGBLOPONfor30secAND GB Oil flow low ( < 3 lpm ) ] AND GB oil temp > 40degc 3) PAH ON AND Other GB LOP ON to OFF AND GB oil temp > 40degc64.2.1) PAH ON1) PAH electric motor ON 2) PAH air pr. after solenoid v/v not low ( > 5 ksc |
| 64.3) AUTO OFF1) Command from PAH Shutdown Seq step# 209 2) PAH GB Oil temp < 35degc65. PAH SUPPORT BRG LOP65.1) STARTPERMISSIVES 1) SB oil temp > 35 degc65.2) AUTO ON1) Command from PAH Startup seq step# 101 2) PAH ON AND [ OtherSBLOPONfor30sec AND SB Oil flow low ( < 7 lpm ) ] AND SB oil temp > 35 degc 3) PAH ON AND Other SB LOP ON to OFF AND SB oil temp> 35degc65.3) AUTO OFF1) Command from PAH shutdown seq. step# 209 2) PAH SB Oil temp < 30degc66. PAH AIR O/L DAMPER66.1) PROTECTION CLOSE1) Both PA Fans OFF66.2) AUTO OPEN1) Command from Sequence step# 10566.3) OPEN PERMISSIVE1) PAH ON AND boiler not working |
| 66.4) AUTO CLOSE1) PAH OFF AND boiler working 2) Command from Sequence step# 107 3) Command from Sequence step# 20266.5) CLOSE PERMISSIVE1) PAH FG i/l damper closed AND Both FG ecobypass dampers closed 67. PAHAIRO/LDAMPERBLOWER1,267.1) AUTO OFF1) Both SAH OFF 2) PAH air o/l damper open 3) Command from PAH sequence step# 10667.2) PROTECTION OFF1) Blower ON AND knife gate closed67.3) AUTO ON1) Other blower ON to OFF AND PAH air o/l damper closed AND Any SAH ON 2) Other blower ON AND Blower o/l pr. Low AND PAH air o/l damper closed AND Any SAH ON 3) [ [ Any SAH ON AND PAH air o/l damper close ] OR SGC startupseq108OR SGCshutdownseq202] AND Other blower OFF |
| 67.4) BLOWER KNIFE GATE AUTO OPEN1) Any blower ON67.5) BLOWER KNIFE GATE AUTO CLOSE1) Both blower OFF 68. PAHFGI/LDIVDAMPER68.1) PROTECTION CLOSE1) Both PA Fans OFF68.2) AUTO OPEN1) Command from SGC sequence step# 112 2) PAH FG charging from eco o/l selected68.3) OPEN PERMISSIVE1) [[ PAH ON AND air i/l AND o/l damper open ] AND [ Any PA fan ON AND Its o/l damper open ]] 2) Boiler not working68.4) AUTO CLOSE1) [ PAH SCAPH path not available OR Air o/l damper closed] AND Boiler working 2) Command from SGC sequence step# 107 3) Command from SGC sequence step# 201 4) PAH FG charging from eco bypass selected 5) PAH OFF for 30s |
| 69. PAH FG I/L DAMPER BLOWER1,269.1) AUTO STOP1) Both SAH OFF 2) PAH FG i/l damper not open / close69.2) PROTECTION STOP1) Blower ON AND [ Both seal air v/v closed OR FG i/l damper SA blower o/l knife gate closed69.3) AUTOSTART1) Other blower ON AND hdr pr. low 2) Other blower OFF AND [command from SGC step114 OR 109 OR Command from SGC step 205] 3) Other blower On to OFF AND Any SAH ON AND FG i/l damper not open/close69.4) PAH FG I/L DAMPERSA V/V AUTO OPEN1) Command from sequence step# 109 2) Command from sequence step# 205 3) FG inlet damper closed AND Any FG inlet damper blower ON69.5) PAH FG I/LDAMPERS AV/V AUTO CLOSE1) PAH FG inlet damper open AND Any FG inlet damper blower ON |
| 70. PAH FG O/L DAMPER70.1) AUTO CLOSE1) Corresponding PAH OFF AND Other PAH ON 2) Air outlet damper closed70.2) TRIP TO MANUAL1) No release to auto70.3) RELEASE TO AUTO1) Command from sequence logic 2) PAH ON AND Any PA fan ON AND Its outlet gate open AND Both RAPH outlet damper open AND Air outlet damper open AND [ [ FG inlet div damper close AND Eco bypass damper open] OR FG inlet div damper open]71. PAH ECONOMISER BYPASS DAMPER71.1) AUTO OPEN1) Command from PAH sequence step# 113 2) PAH FG charging from eco bypass selected AND FG i/l damper closed AND [ PAH ON AND PAH air o/l damper open] AND [ Any PA fan ON AND PA fan o/l gate open]71.2) RELEASE OPEN1) [ PAH ON AND Air o/l damper open] AND [ Any PA fan ON AND PA fan o/l gate open] 2) Boiler not working |
| 71.3) AUTO CLOSE1) Command from PAH seq step# 201 2) Command from PAH seq step# 112 3) Boiler working AND PAH o/l damper closed 4) Boiler working ANDPAHOFFTD30s 5) PAH OFF 6) PAH FG charging from eco o/l selected72. PAH ECO BYPASS DAMPER BLOWER72.1) AUTO START1) Command from Sequence step# 109 2) Command from Sequence step # 206 3) PAH eco bypass damper closed AND Any SAH ON72.2) AUTO STOP1) Command from sequence step# 115 2) PAH eco bypass damper open 3) Both SAH OFF TD 15m 73. PA SCAPH I/L DAMPER73.1) AUTO OPEN1) Command from PAH sequence step# 209 2) PAH SCAPH in service73.2) AUTO CLOSE1) Command from PAH sequence step# 107 |
| 74. PA SCAPH O/L DAMPER74.1) AUTOOPEN 1) Command from PAH sequence step# 209 2) PAH SCAPH in service74.2) AUTO CLOSE1) Command from PAH sequence step# 107 75. PA SCAPH BYPASS DAMPER75.1) AUTO OPEN1) Command from PAH sequence step# 209 2) PAH SCAPH not in service75.2) AUTO CLOSE1) Command from PAH sequence step# 107 2) PAH SCAPH in service 76. RAPHFGCONTROLDAMPER 1,276.1) AUTO OPEN1) SAH ON 2) PAH ON 3) Command from PAH Startup Sequence step# 111 4) Command from SAH Startup Sequence step# 106 5) Command from SAH Shutdown Sequence step# 203 6) Both SAH OFF76.2) PROTECTION OPEN1) MFTOperatedANDSAHONTD5s |
| 76.3) CLOSE RELEASE1) SAH OFF AND Corresponding PAH OFF AND [ Other SAH ON OR Other PAH ON] 2) Both ID Fans OFF76.4) AUTO CLOSE1) [ Corresponding PAH AND SAH both OFF] AND [ Both other PAH AND SAH are not OFF]77. LDO PUMP77.1) START PERMISSIVE1) MCC not disturbed 2) Pump not overloaded 3) Suction pressure not low (>-0.1ksc)77.2) TRIP PROTECTION1) Pump overload 2) LDO tank level very low 3) LDO suction pressure before strainer low (<-0.1ksc) 78. HFO PUMP78.1) START PERMISSIVE1) MCC not disturbed 2) Pump not overloaded 3) Suction pressure not low78.2) TRIPP ROTECTION1) Pump overload 2) HFO tank level very low 3) HFO suction pressure before strainer low |
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