S.No
|
Fault
|
Consequence
|
Actions
|
1
|
1 mill Tripped out of
6
|
Ø Runback
will Act
Ø Capability
- 466 MW
Ø Machine
Comes in IP mode
|
Ø Reduce
Load
Ø Observe
Drum Level( will go up)
Ø Reduce
Throttle Pressure SP
Ø Take
another Mill
|
2
|
2 mills Tripped out of 6
|
Ø Runback
will Act
Ø Capability
- 372 MW
Ø Machine
Comes in IP mode
|
Ø Reduce
Load
Ø Observe
Drum Level( will go up)
Ø Observe
Flame Scanner
Ø If
Necessary take Oil gun at an elevation
Ø Reduce
Throttle Pressure SP
Ø Take
another Mill
|
3
|
Any one ID Fan Trips
|
Ø Runback
will Act
Ø Unit
Capability-300 MW
Ø Trip
command to Respective FD Fan/ If not Tripped, Trip FD
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø Machine
Comes in IP Mode
|
Ø Observe
Furnace Pressure
Ø Observe
Total Air Flow
Ø Ensure
Tripped FD Discharge Damper Closed
Ø Ensure
running FD Fan current in limit
Ø Ensure
Tripped ID Fan IGV closed on auto
Ø Observe
Drum Level
Ø Observe
Scanner
Ø Reduce
throttle Pr SP
Ø Inform
Maintenance for check
|
4
|
Both ID Fans Tripped
|
Ø Unit
will trip on MFT
|
Ø Do
shutdown Activities
|
5
|
Any one FD Fan Trips
|
Ø Runback
will Act
Ø Unit
Capability-300 MW
Ø Trip
command to Respective ID Fan/ If not Tripped, Trip ID
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø Machine
Comes in IP Mode
|
Ø Observe
Furnace Pressure
Ø Observe
Total Air Flow
Ø Ensure
Tripped FD Discharge Damper Closed
Ø Ensure
running FD Fan current in limit
Ø Ensure
Tripped ID Fan IGV closed on auto
Ø Observe
Drum Level
Ø Observe
Scanner
Ø Reduce
throttle Pr SP
Ø Inform
Maintenance for check
|
4
|
Both FD Fans Tripped
|
Ø Unit
will trip on MFT
|
Ø Do
shutdown Activities
|
5
|
Anyone PA Fans Trip
|
Ø Unit
Capability-300 MW
Ø If
PA Header comes to 625 mmWC and not increased within 5 Seconds, all Mills
will Trip on PA Header Pressure Low and Unit will trip on Loss of All Fuel
Ø If
PA Header comes to 500 mmWC, all Mills will Trip on PA Header Pressure Low
and Unit will trip on Loss of All Fuel
|
Ø Observe
PA Header Pressure
Ø Ensure
Discharge Damper of PA Fan got closed
Ø Observe
Drum, Furnace, Total air flow
Ø Observe
Flame Scanner, Take Oil gun in elevation if required
Ø Inform
concerned Department for Tripping of Fan
|
4
|
Both PA Fans Tripped
|
Ø all
Mills will Trip on PA Header Pressure Low and Unit will trip on Loss of All
Fuel(MFT)
|
Ø Do
shutdown Activities
|
5
|
Any1 BCW trips out of 2
|
Ø Standby
will come
Ø If
standby BCW pump do not come, runback will Act
Ø Capability-
300 MW
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
|
Ø Inform
Concerned /department for the Tripping
Ø Observe
Drum level
Ø Observe
Flame Scanner
Ø Observe
running Pump DP
|
6
|
2 BCW pumps Trip
|
Ø Standby
BCW will come
Ø Runback
will Act
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø If
standby donot come, Boiler will trip on MFT due to Waterwall Circulation Incorrect
|
Ø Observe
Drum,Furnace, BCW DP, flame Scanner
Ø If
unit trips, Follow the shutdown activities
|
7
|
Anyone SAPH Trips
|
Ø Air
Motor Comes in auto
Ø If
air Motor do not come, runback will act
Ø Capability:300
MW
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
|
Ø Observe
SAPH FG /Air Outlet Temperature
Ø Inform
concerned deptt for Tripping of SAPH
Ø If
air Motor does not come , Ensure Closing of SAPH FG & Air Inlet &
Outlet dampers
Ø Observe
Secondary air temperature at Windbox inlet
|
8
|
Both SAPH Trips
|
Ø Air
motor comes in auto
Ø Air
motor do not come, Unit will trip on Both SAPH Tripped (MFT)
|
Ø Observe
SAPH FG /Air Outlet Temperature
Ø Inform
concerned deptt for Tripping of SAPH
Ø If
air motor do not come, Follow the shutdown activities
|
9
|
Anyone SAPH Trips
|
Ø Air
Motor Comes in auto
Ø If
air Motor do not come,
|
Ø Observe
PAPH FG /Air Outlet Temperature
Ø Inform
concerned deptt for Tripping of SAPH
Ø Ensure
Closing of PAPH FG & Air Inlet & Outlet dampers
Ø Observe
PAPH FG /Air Outlet Temperature
Ø Reduce
load to 300 MW
Ø Keep
4/5 Mills in service
Ø Observe
Mill Outlet temp
|
10
|
Both PAPH Trips
|
Ø Air
Motor Comes in auto
Ø If
air Motor do not come,
|
Ø Observe
PAPH FG /Air Outlet Temperature
Ø Inform
concerned deptt for Tripping of SAPH
Ø Try
to restore at least one PAPH
Ø Take
Maximum Oil guns
Ø Stop
All Mills One by One, Stop PA Fan
Ø Observe
Furnace Pr, Total air Flow, Reduce Throttle Pr SP
Ø Take
MDBFP & Maintain Drum Level
Ø Load
May get stabilized at 100 MW
|
11
|
Anyone TDBFP Trips
|
Ø MDBFP
will come in auto
Ø MDBFP
do not come in 10 seconds, Runback will Act
Ø Unit
Capability: 270 MW
Ø Only
4 mills will remain
Ø Machine
will come in IP mode
|
Ø MDBFP
R/C Valve close on Auto, If not Close it
Ø Inform
Concerned Deptt
Ø Ensure
running TDBFP in auto, Drum Level in auto. Otherwise Increase Speed Reference
Ø Observe
Difference b/w BLI and FW, If its still High, Reduce Coal flow
Ø Still
Drum is not Rising, Trip 1 mill and take one oil gun
Ø Reduce
Th Pr SP
Ø Inform
concerned Deptt
|
12
|
Both TDBFP trips
|
Ø MDBFP
comes in Auto
Ø Only
4 mills remains
Ø Machine
comes in IP Mode
|
Ø Increase
MDBFP Scoop to maintain Drum Level. Close its r/c valve
Ø Still
Drum is not Rising, Trip 1 mill and take one oil gun
Ø Reduce
Th Pr SP
Ø Inform
concerned Deptt
|
13
|
Both TDBFP Trips
|
Ø MDBFP
does not come in auto
Ø Unit
will trip on MFT(No BFP)
|
Ø Do
shutdown activities
Ø Inform
concerned Deptt
|
14
|
Any 1 CEP Trips
|
Ø Standby
CEP comes in auto
Ø If standby does not come , runback will act, Capability:
275 MW
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø Machine
comes in IP Mode
|
Ø Inform
concerned Deptt
Ø Close
D/A CV to raise CEP discharge Header Pr
Ø Observe
D/A level
Ø Reduce
Pressure SP
|
15
|
Both CEP Trips
|
Ø Standby
CEP comes in auto
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø Machine
comes in IP Mode
Ø Standby
CEP does not come in auto
Ø Only
5 mills will Remain , rest will trip from top/ If not tripped, Trip from top
leaving only 5 mills
Ø Machine
comes in IP Mode
|
Ø Close
D/A CV to raise CEP discharge Header Pr
Ø Observe
D/A level
Ø Reduce
Pressure SP
Ø Try
to restore at least one CEP
Ø Trip
Mills one by one & Reduce load < 100 MW
Ø Take
one/two elevation guns
Ø Observe
D/A , H/W and Vacuum
Ø Take
MDBFP to maintain Drum
Ø Unit
May trip on D/A Level Low, Vacuum if any of the CEPs cannot be revived
|
Tuesday, December 31, 2019
Main Equipments Tripped
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