Write Up for Boiler Interlock System (TCL)-Rev.1

TATA CHEMICALS LIMITED MITHAPUR1 X 200 TPH CFBC BOILER (HPB#4) – Rev.1

WRITE UP ON BOILER LOGIC SYSTEM

IMPORTANT NOTE:This write up is meant for general guidelines and better understanding of the system. However it may be noted that All the logic conditions spelt in English Language may not be exact equivalent of pictorial representations of logics.It is mandatory that the operating personal should refer to the respective contract logics.It must be recognized that no amount of written instruction can replace intelligent thinking and reasoning on the part of boiler operators, especially when coping with unforeseen operating conditions. It is operator’s responsibility to become thoroughly familiar, not only with immediate steam generating equipment but also with all pertinent control equipment. Satisfactory performance and safety depend to a great extent on proper functioning of controls and auxiliary equipment.The Boiler Logic System has been designed for ENERGISED to Open and De-energise to Close philosophy.

1.0

ID FAN START / STOP LOGIC

STARTING LOGIC

ID FAN will start after ID Fan start command is given from DCS only when the following conditions are satisfied:

1. Drive remote selected (05-MF-202G)2. Module Ready (05-MF-202R)3. Feild Stop PB not operated(05-MF-202K)4. ID Fan-A Disc damper closed (05ZSC-279)5. ID Fan not running

6. {ID Fan vane minimum (05ZSC285) AND Fluid Coupling Bypass selected OR Fluid Coupling Bypass selected

AND Scoop minimum (05ZSC-278) } 7. ID Fan-A motor bearing (DE) temp not high8. ID Fan –A motor bearing (NDE) temp not high9. ID Fan-A bearing (DE) temp not high10. ID Fan-A bearing (NDE) temp not high 11. { (Coal Feeder – 1 discharge gateS closed ( 05ZSC-310/311) 12. Coal Feeder – 2 discharge gate closed (05ZSC-333/334) 13. SWGR.Read (05-MF-202E)

14. Trip Circuit Healthy (05-MF-202C) 15. SWGR. Ready to start(05-MF-202A)

STOP / TRIPPING LOGIC If any one of the following signals is present ID Fan will stop / trip

1. ID Fan stop command from DCS2. Feild Stop PB(Local) operated(05-MF-202K)3. O/L acted(05-MF-202C)3. ID Fan – A bearing (DE) temp high4. ID Fan- A bearing (NDE) temp high5. ID Fan – A motor bearing (DE) temp high6. ID Fan – A motor bearing (NDE) temp high7. Furnace Pressure very low 8. Module not ready(05-MF-202R)9. ID Fan-A Bearing (DE) VIB. Very high10. Scop outlet temperature very high11. ID Fan running for 30 sec

AND Oil Pressure low

12. SWGR. Not ready (05-MF-202E)13. ID Fan Bearing (NDE) VIB Very High14. ID Motor Bearing (NDE) VIB Very High15. ID Motor Bearing (DE) VIB Very High16. ID Fan inlet Pressure very low

2.0

ID FAN DISCHARGE DAMPER LOGICIDFan discharge damper will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Damper not fully opened (05ZS0-279)2. Valve closing logic not present3. Module Ready(05-MV-129R)4. O/L not operated(05-MV-129L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-279)7. {(Remote selected AND Open command from CRT AND ID Fan running and 60sec time count over) 8. Field stop not operated (05-MV-129K)

ID Fan discharge damper will close if the following signals are present:

1. Damper not fully closed (05ZSc-279)2. Valve opening logic not present3. Module Ready(05-MV-129R)4. O/L not operated(05-MV-129L)5. Stop command not operated from CRT6. Valve opening torque not high(05TSc-279)7. {(Remote selected AND Open command from CRT AND ID Fan not running )

8. Field stop not operated (05-MV-129K)

3.0SA FAN – A/B START / STOP LOGIC

SA Fan-A will start after SA Fan-A start command is received from the CRT only when the following conditions are satisfied:

1 Drive remote selected (05-MF-203G) 2 Module Ready (05-MF-203R) 3. Feild Stop PB not operated(05-MF-203K) 4. SA Fan not running (05-MF-203M) 5. {SA Fan vane minimum (05ZSC-280) AND Fluid Coupling Bypass selected

OR Scoop minimum (05ZSC-268)

AND Fluid Coupling selected}

7. SA Fan motor bearing (DE) temp not high 8. SA Fan –A motor bearing (NDE) temp not high 9. SA Fan-A bearing (DE) temp not high 10. SA Fan-A bearing (NDE) temp not11. Furnace Pressure > min 12. Furnace Pressure < max 13. SWGR.Ready (05-MF-203R)

14. Trip Circuit Healthy (05-MF-203C) 16. ID Fan Running (05-MF-202M) 17. SWGR.Ready to start (05-MF-202A)

SA Fan –A will stop /trip if any one of the following signals is present:

1. SA Fan stop command from DCS2. Feild Stop PB(Local) operated(05-MF-203K)3. O/L acted(05-MF-203C))4. SA Fan bearing (DE) temp high5. SA Fan bearing (NDE) temp high6. SA Fan motor bearing (DE) temp high7. SA Fan motor bearing (NDE) temp high8. ID FAN not running (05-MF-202M)9. Module not ready(05-MF-203R)10. SA Fan Bearing (DE) VIB. Very high11. Scop outlet temperature very high12. SA Fan running for 30 sec

AND Oil Pressure Low

13. Trip Ckt. Not healthy (05-MF-203L)

14. Boiler tripped

15. SA Fan Bearing (NDE) VIB Very High

16. SWGR. Not ready (05-MF-203E)

17. SA Motor Bearing (NDE) VIB Very High

18. SA Motor Bearing (DE) VIB Very High

4.0PA FAN START / STOP LOGIC

PA Fan will start after receiving PA Fan –A start command from CRT only if the following conditions are satisfied:

1 Drive remote selected (05-MF-201G)2 Module Ready (05-MF-201R)3. Feild Stop PB not operated(05-MF-201K)4. PA Fan not running (05-MF-201M)5. {PA Fan vane minimum (05ZSC283) AND

Fluid Coupling Bypass selected OR

7. Scoop minimum (05ZSC-273) AND Fluid Coupling Bypass selected}8. PA Fan motor bearing (DE) temp not high9. PA Fan –A motor bearing (NDE) temp not high10. PA Fan-A bearing (DE) temp not high11. PA Fan-A bearing (NDE) temp not high 12. Furnace Pressure > min 13. Furnace Pressure < max

14. SWGR.Ready (05-MF-201E)15. Trip Circuit Healthy (05-MF-201C)16. ID Fan Running (05-MF-202M)17. Drum Level > min18. Drum Level max19. TA Flow > min20. SA Flow > min21. SA Fan running (05-MF-203M)22. SWGR. Ready to start (05-MF-201A)

PA Fan will stop / trip if any one of the following signals is present:1. PA Fan stop command from DCS

2. Feild Stop PB(Local) operated(05-MF-201K)3. PA Discharge Pressure >max4. PA Fan bearing (DE) temp high5. PA Fan bearing (NDE) temp high6. PA Fan motor bearing (DE) temp high7. PA Fan motor bearing (NDE) temp high8. ID FAN not running (05-MF-202M)9. Module not ready(05-MF-201R)10. PA Fan Bearing (DE) VIB. Very high11. Scop outlet temperature very high12. PA Fan running for 30 sec

AND Oil Pressure Low

13. Trip Ckt. Not healthy (05-MF-201C

14. )

15. Boiler tripped

16. PA Fan Bearing (NDE) VIB. Very High

17. SA Fan not running (05-MF-203M)

18. SWGR.not ready (05-MF-201E)

19. PA Motor Bearing (NDE) VIB. Very High

20. PA Motor Bearing (DE) VIB. Very High

5.0

FEED TRANSFER PUMP 1/2 START/STOP LOGIC

Feed Transfer pump1/2 will start if the following conditions are satisfied :1. Pump 1/2 not running(05-MP-106M/107M)2. Feild Stop PB not operated(05-MP-106K/107K)3. Level not very low.4. O/L not acted (05-MP-106L/107L)5. Stop command not operated from CRT6. Module Ready (05-MP-106R/107R)7. [{(Remote selected AND Open command from CRT)

Cooling water pump will stop if any one of the following signal is present1. Feild Stop PB operated(05-MP-106K/107K)2. Level very low.3. O/L acted (05-MP-106L/107L)4. Stop command operated from CRT

5. Module not Ready (05-MP-106R/107R)

6.0

COAL FEEDER-1/2 START / STOP SEQUENCE

Coal feeder will start after start command is given from CRT if the following conditions are satisfied :

1. Remote selected (05-MK-301G/302G)2. Module Ready (05-MK-301R/302R)3. Fuel Conveyor –1 running(05-MC-301M/302M)

4. Bed temp > min 1A (2 out of 4 logic)5. Air protect ok6. Boiler not tripped7. C oal Feeder not running(05-MK-301M/302M)8. PA fan running( 05-MF-201M)9. DOL not selected (05-MK-301O/302O)10. Coal feeder Field stop PB not operated 905-MK-3013/3023)11. Ready for start (05-MK-3014/3024)

Coal feeder will stop / trip if any one of the following signal is present :

1. PA fan not running2. Boiler tripped3. Bed temp > 920deg C4. Fuel Conveyor not running (05-MC-301M/302M)5. Coal feeder stop PB (DCS) operated6. Feild stop PB operated.(05-MK-3013/3023)7. Module not ready (05-MK-301R/302R)8. O/L acted(05-MK-3015/3025)9. Bed Temperature < min310. Syphon-1 outlet temperature > max(450 Deg C)11. Syphon-2 outlet temperature > max(450 Deg C)12. Ready for start signal not present (05-MK-3014/3024)

7.0

COAL CONVEYOR 1/2 START/STOP SEQUENCE

Coal Conveyor 1/2 will start after a Start command is given from CRT only when the following conditions are satisfied :

1. Remote selected (05-MC-301G/302G) 2. Module Ready (05-MC-301R/302R) 3. Fuel Feeder not running(05-MK-301M/302M) 4. Lime Screw Feeder not running(05-MK-303M/304M) 5. O/L not acted(05-MC-3015/3025) 6. Coal Conveyor not running(05-MC-301M/302M) 7. Coal Conveyor outlet gates not closed 8. DOL not selected (05-MC-3010/3020) 9. Coal Conveyor Field stop PB not operated (05-MC-3013/3023) 10. Ready for start (05-MC-3014/3024)

COAL CONVEYOR-1/2 will stop/trip if the following signals are present:

1. Boiler tripped 2. Both Outlet gates closed. 3. Coal feeder stop PB (DCS) operated 4. Feild stop PB operated.(05-MC-3013/3023) 5. Module not ready (05-MC-301R/302R) 6. O/L acted(05-MC-3015/3025) 7. Ready for start signal not present (05-MC-3014/3024)

8.0

BOILER TRIP CONDITIONS

Master fuel trip is initiated by one of the following conditions:

1. Bed temp > max 2 (940 Deg C)2. Furnace pressure very high (100 mmwcl)3. Furnace pressure very low (-150 mmwcl)

4. Drum level very high 5. Drum level very low 6. Total PA flow < min (50T/HR)7. PA discharge pressure < min(900 mmwcl)8. Bed height very low(600 mm)9. Bed height very high(1400mm)10. Both ID tripped11. Emergency PB (DESK) operated12. MFT operated from CRT

9.0

BOILER AIR PROTECT OK

Boiler air protect ok signal will be on if the following signals are present :

1. Furnace draft > min2. Furnace draft < max3. Bed temp < max 34. Syphon 1 temp < max5. Syphon 2 temp <max6. Drum level > min7. Drum level < max8. PA flow > min.9. Bed Temp >min 1A

10.0AIR / FLUE TRIPPING SEQUENCE

When the boiler trips the air and flue tripping sequence will be as follows:

Step 1.

Both the coal feeders will trip and associated outlet gates will also close if Bed Temp >max3 (920Deg C)

Step 2.Both PA fans will trip after coal feeders trip if Bed Temp> max 2 (940 Deg C)

Step 3. Both SA fans will trip 5mins after PA fans trip if Bed Temp > max2

11.0

HOT GAS GENERATOR - 1/2

FURNACE PURGE

Before any fuel firing can take place a satisfactory Purge cycle must be completed. To start a furnace Purge cycle the following conditions must be satisfied:

1. Primary air pressure not low2. Atomising air pressure not low (05PSL-631/645)3. Fuel oil pressure not low (05PSL-622/637)4. Fuel oil pressure not high 5. No flame6. Oil S30V in closed position ()7. HAG outlet gas temp not high high8. HAG bypass isolation damper fully closed (P26SD5/6ZS1)9. No scavenging on

10. Instrument Air Pressure not low(05PSL-619/634)11. PA flow > min12. Diff pressure across HGG not low.(05DPS-657/670)

With all the above conditions satisfied Purge Ready lamp will be on.After Purge Start PB operated furnace purging will start Purge Ready lamp will be off, Purge Progress indication will be available in CRT and after a time delay of 5 mins BURNER READY and Purge Complete indication will be available on CRT.

BURNER START COMMAND

With BURNER READY signal on

AND

(Local mode selected

ANDBurner start PB operated)

OR(Remote mode selected

ANDBurner start command from CRT)

Following cycle will be initiated :

Step 1

Ignitor will be inserted and when Ignitor Retract limit switch is released Ignitor Transformer will be energisedFor 15 sec

Step 2

When Ignitor is inserted oil valve and atomizing air valve will open simultaneously.

Step 3

CONDITION 1Ignition time over and oil flame established

Oil valve and Atomising valve will remain in open position.

CONDITION 2

Ignition time over, oil valve opened but oil flame not establishedOil valve will be closed. Ignitor will be inserted and energized .Scavenge on / start indication will be available on CRT and Atomising valve will remain in open condition.Scavenge valve will open.

After 20secs HEA will be de-energised and after 25secs both scavenge and atomising valve will be closed

Step 4

Oil burner firing and burner stop PB operatedOil valve will close

Atomising valve remain openScavenge on/start indication will be available on CRTIgnitor will be inserted and energized.

Scavenge valve will open. After 20secs Ignitor will be de-energised and retracted after 20 sec and after 25 secs both scavenge and atomising air valve will close.

CONDITIO 3

Oil burner firing and HAG trips due to any one of the following conditions :

Prmary air pressure low Atomising air pressure low

HAG outlet temp high high Emergency stop PB operated Oil pressure low Oil pressure high. DP across HGG low PA flow low

Then the following occurs:Oil valve will close

Atomising air valve will close

No scavenging will take place.

12.0

CYCLONE ASH SCREW FEEDER 1/2

Cyclone ash screw feeder will start after Cyclone ash screew feeder – 1 start command is given from DCS if the following conditions are satisfied :

1. Remote selected (05-MK-505G/506G) 2. Module Ready (05-MK-505R/506R) 3. Screw Feeder not running(05-MK-505M/506M) 4. Ash Static Cooler Level not high (05LSH-516/509) 5. O/L not acted(05-MK-5055/5065) 6. Cooling Water Flow ok(05FSL-725/732) 7. Inlet gates closed(05ZSC-512/505) 8. DOL not selected (05-MK-5050/5060) 9. Coal Conveyor Field stop PB not operated (05-MK-5053/5063) 10. Ready for start (05-MK-5054/5064)

Cyclone ash screw feeder will stop if any one of the following signals is present :

1. Boiler tripped 2. Ash Static Cooler Level high (05LSH-516/509) 3. Screw feeder stop PB (DCS) operated 4. Feild stop PB operated.(05-MK-5053/5063) 5. Module not ready (05-MK-505R/506R) 6. O/L acted(05-MK-5055/5065) 7. Ready for start signal not present (05-MK-5054/5064)

13.0

CYCLONE-1/2 DISCHARGE GATE VALVE

Cyclone discharge gate will open if the following conditions are satisfied:

1. Cyclone no discharge gate valve not fully opened ( 05ZSO-512/505)2. Cyclone ash screw feeder -1/2 running(05SAL-514/508)3. Solenoid valve power supply available4. (Bed temp < 830deg C.AND Auto selected)OR(Manual selected AND Open command from CRT)

Cyclone discharge gate will close if any one of the following signal is present 1. Cyclone ash screw feeder – 1/2 not running(05SAL-514/508/)2. Solenoid valve power supply not available3. (Close command given from CRT AND Manual selected)OR(Auto selected AND Bed Temp>860 Deg C)4. Boiler tripped. AND

. Cyclone-1/2 disc gate is not full closed (05ZSC-512/505)

14.0

BED ASH SCREW FEEDER - 1/3

Bed ash screw feeder – 1/3 will start after receiving start command from CRT if the following conditions are satisfied :

1. Remote selected (05-MK-501G/502G) 2. Module Ready (05-MK-501R/502 R) 3. Screw Feeder not running(05-MK-501M/502M) 4. Cooling water flow ok (05FSL-723/727) 5. O/L not acted(05-MK-5015/5025) 6. Bed Ash Screw Feeder 2/4 not running(05SAL-522/528) 7. Inlet gate closed(05ZSC-518/525) 8. DOL not selected (05-MK-5010/5020) 9. Bed Ash Screw Feeder Field stop PB not operated (05-MK-5013/5023) 10. Ready for start (05-MK-5014/5024)

Bed ash screw feeder – 1/2 will stop if any one of the following signals is present:

1. Boiler tripped 2. Bed Ash Screw Feeder 2/4 not running (05SAL-522/528) 3. Screw feeder stop PB (DCS) operated 4. Feild stop PB operated.(05-MK-5013/5023) 5. Module not ready (05-MK-501R/502R) 6. O/L acted(05-MK-5015/5025) 7. Ready for start signal not present (05-MK-5014/5024)

15.0

BED ASH DISCHARGE GATE VALVE 1/2

Bed ash discharge gate valve will open if the following conditions are satisfied :

1. Bed ash gate valve not fully opened (05ZS0-518/525)2. Bed ash screw feeder speed 1/3 running (05SAL-521/527)3. ( Auto selected

AND4. Bed level high)

OR5. ( Auto not selected

AND6. Open command given from DCS).7. Solenoid valve power supply available(P64SG10-SK/P64SG14-SK)

Bed ash discharge gate valve will close if any one of the following signals is present :

1. Bed ash screw feeder 1/3 not running(05SAL-521/527)2. (Auto selected

AND3. Bed level low)4. (Auto not selected

AND5. Close command given from CRT)6. Boiler tripped.7. Solenoid valve power supply not available8. Bed ash gate valve not fully closed (05ZSC-518/525)

16.0 EMERGENCY BLOWDOWN VALVE

EBD valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. EBD valve not fully opened (05ZS0-145)2. Valve closing logic not present3. Module Ready(05-MV-116R)4. O/L not operated(05-MV-116L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-145)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-116K)

EBD Valve will close if the following signals are present:

1. EBD valve not fully closed (05ZSC-145)2. Valve opening logic not present3. Module Ready(05-MV-116R)4. O/L not operated(05-MV-116L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-145)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-116K)

17.0

FEED WATER MOTORISED 0 - 100% ISOLATION VALVE Feed Water Motorised valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Isolation valve not fully opened (05ZS0-125)2. Valve closing logic not present3. Module Ready(05-MV-118R)4. O/L not operated(05-MV-118L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-125)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-118K)

Feed Water Motorised Valve will close if the following signals are present:1. Isolation valve not fully closed (05ZSC-125)2. Valve opening logic not present3. Module Ready(05-MV-118R)4. O/L not operated(05-MV-118L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-125)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-118K)

18.0 MAIN STEAM BYPASS VALVE

Main Steam Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Bypass valve not fully opened (05ZS0-169)2. Valve closing logic not present3. Module Ready(05-MV-104R)

4. O/L not operated(05-MV-104L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-169)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-118K)

Main Steam Bypass Valve will close if the following signals are present:1. Bypass valve not fully closed (05ZSC-125)2. Valve opening logic not present3. Module Ready(05-MV-104R)4. O/L not operated(05-MV-104L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-169)7. {(Remote selected AND Close command from CRT AND Auto not selected) OR (Auto selected AND Main

steam stop valve full open) ) 8. Field stop not operated (05-MV-104K)

19.0 FEED WATER MOTORISED 0 - 40% ISOLATION VALVE

Feed Water Motorised Isolation valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Isolation valve not fully opened (05ZS0-124)2. Valve closing logic not present3. Module Ready(05-MV-117R)4. O/L not operated(05-MV-117L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-124)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-117K)

Feed Water Motorised Isolation Valve will close if the following signals are present:

1. Isolation valve not fully closed (05ZSC-124)2. Valve opening logic not present3. Module Ready(05-MV-117R)4. O/L not operated(05-MV-117L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-124)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-117K)

20.0

FEED WATER MOTORISED (0% - 100%) BYPASS ISOLATION VALUE

Feed Water Motorised Isolation valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Isolation valve not fully opened (05ZS0-127)2. Valve closing logic not present3. Module Ready(05-MV-119R)4. O/L not operated(05-MV-119L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-127)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-119K)

Feed Water Motorised Isolation Valve will close if the following signals are present:1. Isolation valve not fully closed (05ZSC-127)2. Valve opening logic not present3. Module Ready(05-MV-119R)

4. O/L not operated(05-MV-119L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-127)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-119K)

21.0 MOTORISED ISOLATION VALVE BEFORE START-UP VENT VALVE

Start –up Vent Motorised Isolation valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Isolation valve not fully opened (05ZS0-168)2. Valve closing logic not present3. Module Ready(05-MV-102R)4. O/L not operated(05-MV-102L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-168)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-102K)

Start-up Vent Motorised Isolation Valve will close if the following signals are present:1. Isolation valve not fully closed (05ZSC-168)2. Valve opening logic not present3. Module Ready(05-MV-102R)4. O/L not operated(05-MV-102L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-168)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-102K)

22.0 START-UP VENT VALVE (INCHING TYPE)

Start-up vent valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Start-up vent valve not fully opened (05ZS0-167)2. Valve closing logic not present3. Module Ready(05-MV-101R)4. O/L not operated(05-MV-101L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-167)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-101K) 9. Up stream valve full opened (05ZSO-168)

Start-up vent valve will close if the following signals are present:

1. Start-up vent valve not fully closed (05ZSC-167)2. Valve opening logic not present3. Module Ready(05-MV-101R)4. O/L not operated(05-MV-101L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-167)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-101K)

23.0 DRUM VENT VALVE

Drum vent valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Drum vent valve not fully opened (05ZS0-146)2. Valve closing logic not present3. Module Ready(05-MV-128R)4. O/L not operated(05-MV-128L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-146)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-128K)

Drum vent valve will close if the following signals are present:1. Drum vent valve not fully closed (05ZSC-146)2. Valve opening logic not present3. Module Ready(05-MV-128R)4. O/L not operated(05-MV-128L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-146)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-128K)

24.0

MAIN STEAM LINE TO EXISTING HEADER VALVE ½

Main Steam Line to Existing Header Isolation valve will open after a Open command is given from CRT only when the following conditions are satisfied :

1. Main Steam Line to Existing Header valve 1/2 not fully opened (05ZS0-199B/199A)2. Valve closing logic not present3. Module Ready(05-MV-126/127R)4. O/L not operated(05-MV-126/127L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-199B/199A)7. {(Remote selected AND Open command from CRTAND Integral Bypass Valve full opened) 8. Field stop not operated (05-MV-126/127K)

Main Steam Line to Existing Header Isolation valve will close after a Close command is given from CRT only when the following conditions are satisfied :

1. Main Steam Line to Existing Header valve 1/2 not fully closed (05ZSC-199B/199A)2. Valve opening logic not present3. Module Ready(05-MV-126/127R)4. O/L not operated(05-MV-126/127L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-199B/199A)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-126/127K)

25.0 BFP DISCHARGE VALVE 1/2

BFP Discharge Valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Isolation valve not fully opened (05ZS0-117A/118A)2. Valve closing logic not present3. Module Ready(05-MV-122/123R)4. O/L not operated(05-MV-122/123L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-117A/118A)7. {(Remote selected AND Open command from CRT AND BFP 1/2 running and 30 sec time count over) 8. Field stop not operated (05-MV-122/123K)

BFP Discharge Valve will close if the following signals are present:

1. Isolation valve not fully closed (05ZSC-117A/118A)2. Valve opening logic not present3. Module Ready(05-MV-122/123R)4. O/L not operated(05-MV-122/123L)5. Stop command not operated from CRT6. Valve opening torque not high(05TSC-117A/118A)7. {(Remote selected AND Close command from CRT AND BFP 1/2 not running )

8. Field stop not operated (05-MV-122/123K)

26.0 ATTEMPERATOR SPRAY BLOCK VALVE (P29GL46 )

Spray Water Block valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Spray Block valve not fully opened (05ZS0-197)2. Valve closing logic not present3. Module Ready(05-MV-105R)4. O/L not operated(05-MV-105L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-197)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-105K)

9. Steam Flow >10% 10. Boiler not tripped

Spray Water Block Valve will close if the following signals are present:1. Spray water Block valve not fully closed (05ZSC-197)2. Valve opening logic not present3. Module Ready(05-MV-105R)4. O/L not operated(05-MV-105L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-197)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-105K) 9. Steam flow< 10%

10. Boiler Tripped

27.0 ATTEMPERATOR MOTORISED ISOLATION VALVE BEFORE SPRAY CONTROL VALVE 1 & 2

Attemperator-1/2 Motorised Isolation valve before Spray Control Valve ½ will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Spray Block valve fully opened (05ZS0-197)2. Valve closing logic not present3. Module Ready(05-MV-109/111R)4. O/L not operated(05-MV-109/111L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-191/188)

7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-109/111K) 9. Isolation valve not full opened (05ZSO-191/188)

Attemperator-1/2 Motorised Isolation Valve will close if the following signals are present:

1. Isolation valve not fully closed (05ZSC-191/188)2. Valve opening logic not present3. Module Ready(05-MV-109/111R)4. O/L not operated(05-MV-109/111L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-191/188)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-109/111K)

9. Boiler Tripped

28.0

ATTEMPERATOR – ½ MOTORISED ISOLATION VALVE BEFORE MOTORISED BYPASS VALVE Attemperator-1/2 Motorised Isolation valve before Bypass Valve 1/2 will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Spray Block valve fully opened (05ZS0-197)2. Valve closing logic not present3. Module Ready(05-MV-110/112R)4. O/L not operated(05-MV-110/112L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-190/189)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-110/112K) 9. Isolation valve not full opened (05ZSO-190/189)

Attemperator-1/2 Motorised Isolation Valve before Bypass Valve will close if the following signals are present:

1. Isolation valve not fully closed (05ZSC-190/189)2. Valve opening logic not present3. Module Ready(05-MV-110/112R)4. O/L not operated(05-MV-110/112L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-190/189)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-110/112K)

9. Boiler Tripped.

29.0DEAERATOR LEVEL CONTROL BYPASS VALVE Deaerator Level Control Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Deaerator level control bypass valve not fully opened (05ZS0-194B)2. Valve closing logic not present3. Module Ready(05-MV-125R)4. O/L not operated(05-MV-125L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-194B)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-125K)

Deaerator Level Control Bypass Valve will close if the following signals are present:

1. Deaerator level control bypass valve not fully closed (05ZSC-194B)2. Valve opening logic not present3. Module Ready(05-MV-125R)4. O/L not operated(05-MV-125L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-194B)7. (Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-125K)

30.0DEAERATOR PRESSURE CONTROL BYPASS VALVE

Deaerator Pressure Control Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Deaerator pressure control bypass valve not fully opened (05ZS0-194A)2. Valve closing logic not present3. Module Ready(05-MV-124R)4. O/L not operated(05-MV-124L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-194A)7. {(Remote selected AND Open command from CRT AND Integral Bypass Valve full open) 8. Field stop not operated (05-MV-124K)

Deaerator Pressure Control Bypass valve will close after Close command is given from CRT only when the following conditions are satisfied :

1. Deaerator pressure control bypass valve not fully closed (05ZSC-194a)2. Valve opening logic not present3. Module Ready(05-MV-124R)4. O/L not operated(05-MV-124L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-194A)7. (Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-124K)

31.0

MAIN STEAM STOP VALVE Main Steam Stop valve will open after a Start command is given from CRT only when the following

conditions are satisfied :1. Main Steam Stop valve not fully opened (05ZS0-170)2. Valve closing logic not present3. Module Ready(05-MV-103R)4. O/L not operated(05-MV-103L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-170)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-103K) 9. Main Steam Bypass valve full opened (05ZSO-169)

Main Steam Stop Valve will close if the following signals are present:

1. Main Steam Stop valve not fully closed (05ZSC-170)2. Valve opening logic not present3. Module Ready(05-MV-103R)4. O/L not operated(05-MV-103L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-170)7. {(Remote selected AND Open command from CRT)

8. Field stop not operated (05-MV-103K)

32.0 ATTEMPERATOR - 1 NOZZLE ISOLATION VALVE

Attemperator –1 nozzle valve will open after open command is received from CRT only if the following conditions are satisfied :

1. Isolation valve not fully opened (05ZSO-158)2. Valve closing logic not present3. Module Ready(05-MV-106R)4. O/L not operated(05-MV-106L)5. Stop command not operated from CRT6. Valve opening torque not high(05TSO-158)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-106K)

9. Boiler not Tripped 10. Spray water Flow >1T/HR

Attemperator-1 nozzel Valve will close if the following signals are present:1. Isolation valve not fully closed (05ZSC-158)2. Valve opening logic not present3. Module Ready(05-MV-106R)4. O/L not operated(05-MV-106L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-158)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-106K)

9. Boiler Tripped 10. Spray water Flow <.5T/HR

33.0 ATTEMPERATOR - 2 NOZZLE ISOLATION VALVE 1/2

Attemperator –2 nozzle valve 1/2 will open after open command is received from CRT only if the following conditions are satisfied :

1. Isolation valve not fully opened (05ZSO-161/160)2. Valve closing logic not present3. Module Ready(05-MV-107/108R)4. O/L not operated(05-MV-107/108L)5. Stop command not operated from CRT6. Valve opening torque not high(05TSO-161/160)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-107/108K)

9. Boiler not Tripped 10. Spray water Flow >1T/HR

Attemperator-2 nozzel Valve 1/2 will close if the following signals are present:1. Isolation valve not fully closed (05ZSC-161/160)2. Valve opening logic not present3. Module Ready(05-MV-107/108R)4. O/L not operated(05-MV-107/108L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-161/160)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-107/108K)

9. Boiler Tripped 10. Spray water Flow <.5T/HR

34.0

CO VENT VALVE ( P26LD9 )CO Vent valve will open only if the following conditions are satisfied :

1. PA Fan not running2. Solenoid Valve Power Supply available

CO Vent valve will close only if the following conditions are satisfied :1. PA Fan running2. Solenoid Valve Power Supply available

35.0 BLOWDOWN TRANSFER PUMP 1/2 START/STOP LOGIC

Blow Down Transfer pump will start if the following conditions are satisfied :1. Pump 1/2 not running(05-MP-108M/109M2. Feild Stop PB not operated(05-MP-108K/109K)3. Level not very low.4. O/L not acted (05-MP-108L/109L)5. Stop command not operated from CRT6. Module Ready (05-MP-108R/109R)7. [{(Remote selected AND Open command from CRT)

Blow Down Transfer pump will stop if any one of the following signal is present1. Feild Stop PB operated(05-MP-108K/109K)2. Level very low.3. O/L acted (05-MP-108L/109L)4. Stop command operated from CRT

5. Module not Ready (05-MP-108R/109R)

36.0 CLOSED LOOP COOLING WATER PUMP 1/2 START/STOP LOGIC

Cooling water pump will start if the following conditions are satisfied :1. Pump 1/2 not running(05-MP-701M/702M2. Feild Stop PB not operated(05-MP-701K/702K)3. Level not very low.4. O/L not acted (05-MP-701L/702L)5. Stop command not operated from CRT6. Module Ready (05-MP-701R/702R)7. [{(Remote selected AND Open command from CRT)

Cooling water pump will stop if any one of the following signal is present1. Feild Stop PB operated(05-MP-701K/702K)2. Level very low.3. O/L acted (05-MP-701L/702L)4. Stop command operated from CRT

5. Module not Ready (05-MP-701R/702R)

37.0 HSD PUMP 1/2START/STOP LOGIC:

HSD pump will start if the following conditions are satisfied :1. Pump 1/2 not running(05-MP-601M/602M2. Feild Stop PB not operated(05-MP-601K/602K)3. Level not very low.4. O/L not acted (05-MP-601L/602L)5. Stop command not operated from CRT6. Module Ready (05-MP-601R/602R)7. [{(Remote selected AND Open command from CRT)

HSD pump will stop if any one of the following signal is present1. Feild Stop PB operated(05-MP-601K/602K)2. Level very low.

3. O/L acted (05-MP-601L/602L)4. Stop command operated from CRT

5. Module not Ready (05-MP-601R/602R)

38.0BFP-1 START / STOP LOGICSTARTING LOGICBFP1/2/3will start after start command is given from DCS only when the following conditions are satisfied:1. Drive remote selected(05-MP-101G)2. SWGR ready to start (05-MP-101A)3. Feild Stop PB not operated(05-mp-101K)4. BFP-1 disc valve closed (05ZSC-117A)5. BFP not running (05-MP-101D) 6. BFP1 motor bearing(DE) temp not high7. BFP1motor bearing (NDE)temp not high8. BFP1 bearing (DE) temp not high9. BFP1 bearing (NDE) temp not high 10 BFP suction pressure not low11. Module Ready (05-MP-101R)12. SWGR. Ready (05-MP-101E)13. Trip Ckt Healthy (0-MP-101C)

STOP / TRIPPING LOGIC If any one of the following signals is present BFP will stop / trip

1. BFP1/2/3 stop command from DCS2. Feild Stop PB operated(05-MP-101K)3. Trip Ckt not Healthy (0-MP-101C)4. BFP1 bearing (DE) temp high5. BFP1 bearing (NDE) temp high6. BFP1 motor bearing (DE) temp high7. BFP1 motor bearing (NDE) temp high8. DEAERATOR Level very low(P2BLS2) 9. BFP Suction pressure very low.10. BFP1 Bearing (DE) VIB. Very high11. BFP1 Bearing (NDE) VIB. Very high12. Module not Ready (05-MP-101R)13. SWGR.not Ready (05-MP-101E)14. DP across Strainer very high

39.0LP DOSING PUMP 1/2/3/4 START/STOP LOGICLP Dosing pump1/2/3/4 will start if the following conditions are satisfied :

1. Pump 1/2 not running(05-MP-102M/103M/104M/105M2. Feild Stop PB not operated(05-MP-102K/103K/104M/105M)3. Level not very low.4. O/L not acted (05-MP-102L/103L/104L/105L)5. Stop command not operated from CRT6. Module Ready (05-MP-102R/103R/104R/105R)7. [{(Remote selected AND Open command from CRT)

LP Dosing pump1/2/3/4 will stop if any one of the following signal is present1. Feild Stop PB operated(05-MP-102K/103K/104K/105K)2. Level very low.3. O/L acted (05-MP-102L/103L/104L/105L)4. Stop command operated from CRT

5. Module not Ready (05-MP-102R/103R/104R/105R)

40.0

STIRRER 1/2 START/STOP LOGICStirrer1/2/ will start if the following conditions are satisfied :

1. Stirrer 1/2 not running(05-MK-101M/102M2. Feild Stop PB not operated(05-MK-101K/102K)3. O/L not acted (05-MK-101L/102L)4. Stop command not operated from CRT5. Module Ready (05-MK-101R/102R)6. [{(Remote selected AND Open command from CRT)

Stirrer1/2/3/4 will stop if any one of the following signal is present1. Feild Stop PB operated(05-Mk-101K/102K)

2. O/L acted (05-MP-102L/103L)3. Stop command operated from CRT

4. Module not Ready (05-Mk-101R/102R)

41.0ATTEMPERATOR 1/2 MOTORISED BYPASS SPRAY CONTROL VALVE Attemperator Spray Control Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Attemperator Spray control bypass valve not fully opened (05ZS0-184/187)2. Valve closing logic not present3. Module Ready(05-MV-113/114R)4. O/L not operated(05-MV-113/114L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-184/187)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-113/114K)

Attemperator Spray Control Bypass Valve will close if the following signals are present:

1. Attemperator Spray control bypass valve not fully closed (05ZSC-184/187)2. Valve opening logic not present3. Module Ready(05-MV-113/114R)4. O/L not operated(05-MV-113/114L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-184/187)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-113/114K)

42.0SAND/LIME STONE FEEDING SCREW FEEDER 1/2Sand/LIME STONE Screw Feeder will start after receiving start command from CRT if the following conditions are satisfied :

1. Remote selected (05-MK-303G/304G) 2. Module Ready (05-MK-303R/304 R) 3. Screw Feeder not running(05-MK-303M/304M) 4. Inlet gate closed(05ZSC-307/326) 5. O/L not acted(05-MK-3035/3045) 6. Fuel Conveyor 1/2 running(05SAL-355/354) 7. Inlet gate closed(05ZSC-308/331) 8. DOL not selected (05-MK-303O/304O) 9. Screw Feeder Field stop PB not operated (05-MK-3033/3043) 10. Ready for start (05-MK-3034/3044)

Sand/LIME STONE Screw Feeder will stop if any one of the following signals is present:

1. Boiler tripped 2. Fuel Conveyor 1/2 not running (05SAL-355/354) 3. Screw feeder stop PB (DCS) operated 4. Feild stop PB operated.(05-MK-3033/3043) 5. Module not ready (05-MK-303R/304R) 6. O/L acted(05-MK-3035/3045) 7. Ready for start signal not present (05-MK-3034/3044)

43.0LIME STONE FEEDING SCREW FEEDER (P1ESC1))

Lime Stone screw feeder will start after receiving start command from CRT if the following conditions are satisfied :

1. Module Ready(P1FESC1-D_RDY)2. Drive in remote mode3. O/L not acted(P1ESC1-D_TRP)4. Screw feeder – 1 not running(P1ESC1-D_RUN)

Sand/ESP screw feeder will stop if any one of the following signals is present:1. Stop command given from DCS2. Module not ready(P1ESC1-D_RDY)3. O/L acted(P1ESC1-D_TRP)

44.0MOTORISED FEED CONTROL BYPASS VALVE

Motorised Feed Control Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Feed control bypass valve not fully opened (05ZS0-127)2. Valve closing logic not present3. Module Ready(05-MV-120R)4. O/L not operated(05-MV-120L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-127)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-120K)

Motorised Feed Control Bypass Valve will close if the following signals are present:1. Feed control bypass valve not fully closed (05ZSC-127)2. Valve opening logic not present3. Module Ready(05-MV-120R)4. O/L not operated(05-MV-120L)5. Stop command not operated from CRT6. Valve closing torque not high(05TS0-127)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-120K)

45.0SLIDE GATE 1/2 AT LIME BUNKER OUTLET

Slide Gate 1/2 will open if the following signals are present:

1. Gate1/2 not fully opened (05ZSO-308/326)2. Gate opening logic not present3. Module Ready(05-MV-301R/302R)4. O/L not operated(05-MV-301L/302L)5. Stop command not operated from CRT6. Gate opening torque not high(05TS0-308/326)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-301K/302K)9. Lime Screw Feeder 1/2 running(05-MV-303M/304M)

Slide Gate 1/2 will close if the following signals are present:1. Gate1/2 not fully closed (05ZSC-308/326)2. Gate closing logic not present3. Module Ready(05-MV-301R/302R)4. O/L not operated(05-MV-301L/302L)5. Stop command not operated from CRT6. Gate closing torque not high(05TSC-308/326)7. {(Remote selected AND Close command from CRT) OR (Lime Screw Feeder1/2 not running)}8. Field stop not operated (05-MV-301K/302K)

46.0SLIDE GATE 1/2 AT SAND BUNKER OUTLET

Slide Gate 1/2 will open if the following signals are present:1. Gate1/2 not fully opened (05ZSO-307/331)2. Gate opening logic not present3. Module Ready(05-MV-303R/304R)4. O/L not operated(05-MV-303L/304L)5. Stop command not operated from CRT6. Gate opening torque not high(05TS0-307/331)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-303K/304K)9. Lime Screw Feeder 1/2 running(05-MV-303M/304M)

Slide Gate 1/2 will close if the following signals are present:1. Gate1/2 not fully closed (05ZSC-307/331)2. Gate closing logic not present3. Module Ready(05-MV-303R/304R)4. O/L not operated(05-MV-303L/304L)5. Stop command not operated from CRT6. Gate closing torque not high(05TSC-307/331)7. {(Remote selected AND Close command from CRT) OR (Lime Screw Feeder1/2 not running)}8. Field stop not operated (05-MV-303K/304K)

47.0SLIDE GATE 1/2/3/4 AT COAL CONVEYOR OUTLET

Slide Gate 1/2/3/4 will open if the following signals are present:1. Gate1/2/3/4 not fully opened (05ZSO-310/311/333/334)2. Gate opening logic not present3. Module Ready(05-MV-501R/502R/503R/504R)4. O/L not operated(05-MV-501L/502L/503L/504L)5. Stop command not operated from CRT6. Gate opening torque not high(05TS0-310/311/333/334)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-501K/502K/503K/504K)

Slide Gate 1/2/3/4 will close if the following signals are present:

1. Gate1/2/3/4 not fully closed (05ZSC-310/311/333/334)

2. Gate opening logic not present3. Module Ready(05-MV-501R/502R/503R/504R)4. O/L not operated(05-MV-501L/502L/503L/504L)5. Stop command not operated from CRT6. Gate closing torque not high(05TSC-310/311/333/334)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-501K/502K/503K/504K)

48.0

MAIN STEAM LINE TO EXISTING HEADER INTEGRAL BYPASS VALVE 1/2

Main Steam Line to Existing Header Isolation Integral Bypass valve will open after a Open command is given from CRT only when the following conditions are satisfied :

1. Main Steam Line to Existing Header Integral Bypass valve 1/2 not fully opened (05ZS0-199C/199D)2. Valve closing logic not present3. Module Ready(05-MV-130/131R)4. O/L not operated(05-MV-130/131L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-199C/199D)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-130/131K)

Main Steam Line to Existing Header Isolation Integral Bypass valve will close after a Close command is given from CRT only when the following conditions are satisfied :

1. Main Steam Line to Existing Header valve 1/2 not fully closed (05ZSC-199C/199D)2. Valve opening logic not present3. Module Ready(05-MV-130/131R)4. O/L not operated(05-MV-130/131L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-199C/199D)7. {(Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-130/131K)

49.0DEAERATOR PRESSURE CONTROL INTEGRAL BYPASS VALVE

Deaerator Pressure Control Integral Bypass valve will open after a Start command is given from CRT only when the following conditions are satisfied :

1. Deaerator pressure control Integral bypass valve not fully opened (05ZS0-194C)2. Valve closing logic not present3. Module Ready(05-MV-121R)4. O/L not operated(05-MV-121L)5. Stop command not operated from CRT6. Valve opening torque not high(05TS0-194C)7. {(Remote selected AND Open command from CRT) 8. Field stop not operated (05-MV-121K)

Deaerator Pressure Control Integral Bypass valve will close after Close command is given from CRT only when the following conditions are satisfied :

1. Deaerator pressure control bypass valve not fully closed (05ZSC-194a)2. Valve opening logic not present

3. Module Ready(05-MV-121R)4. O/L not operated(05-MV-121L)5. Stop command not operated from CRT6. Valve closing torque not high(05TSC-194C)7. (Remote selected AND Close command from CRT) 8. Field stop not operated (05-MV-121K)