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TURBINE AND AUXILIARIES Presentation Transcript
1.TURBINE & AUXILIARIES
2.Presentation outline
CEP Starting
BFP Starting
VACUUM PULLING
HP, LP BYPASS CHARGING
TURBINE ROLLING
CEP Starting
BFP Starting
VACUUM PULLING
HP, LP BYPASS CHARGING
TURBINE ROLLING
3.CEP
For starting first CEP
Checks at LOCAL
No maintenance staff is working.
CEP suction valves are OPEN.
Hot well level is ADEQUATE
Bearing temperature of CEPs is NOT HIGH 60 0 C.
Condensate pump gland sealing water isolating valve is OPEN.
Condensate pump priming (pressure equalizing) valve is OPEN.
CEP bearing cooling water line isolating valve is OPEN.
CEP bearing oil level is adequate.
Emergency push button is released.
ENSURE condensate system is lined up before starting CEP.
Main ejectors inlet/outlet- valves are OPEN & Bypass valve is closed.
Gland steam cooler inlet/outlet valves are open and bypass valve is CLOSED.
LPHs (1-2-3) inlet/outlet valves are CLOSED.
LPHs (1-2-3) bypass valves are OPEN.
LPHs are bypassed initially to minimise corrosion.
4. START the CEP motor.
CEP starting current comes down to 20A after 5 sec.
CEP discharge pressure increases to 25 Kg/cm2. Approx.
CEP's discharge valves open 100%.
CLOSE the air vents on condensate lines.
LOAD the condensate pump by opening V/V on condensate to D/A line.
INSTRUCT the local operator to check bearing temperatures and vibrations.
CHECK that the second condensate pump is ready for starting and is available on STANDBY.
Breaker control switch is on Normal
Pump OK standby - All permissive are SATISFIED.
All local line ups are COMPLETE
For starting first CEP
Checks at LOCAL
No maintenance staff is working.
CEP suction valves are OPEN.
Hot well level is ADEQUATE
Bearing temperature of CEPs is NOT HIGH 60 0 C.
Condensate pump gland sealing water isolating valve is OPEN.
Condensate pump priming (pressure equalizing) valve is OPEN.
CEP bearing cooling water line isolating valve is OPEN.
CEP bearing oil level is adequate.
Emergency push button is released.
ENSURE condensate system is lined up before starting CEP.
Main ejectors inlet/outlet- valves are OPEN & Bypass valve is closed.
Gland steam cooler inlet/outlet valves are open and bypass valve is CLOSED.
LPHs (1-2-3) inlet/outlet valves are CLOSED.
LPHs (1-2-3) bypass valves are OPEN.
LPHs are bypassed initially to minimise corrosion.
4. START the CEP motor.
CEP starting current comes down to 20A after 5 sec.
CEP discharge pressure increases to 25 Kg/cm2. Approx.
CEP's discharge valves open 100%.
CLOSE the air vents on condensate lines.
LOAD the condensate pump by opening V/V on condensate to D/A line.
INSTRUCT the local operator to check bearing temperatures and vibrations.
CHECK that the second condensate pump is ready for starting and is available on STANDBY.
Breaker control switch is on Normal
Pump OK standby - All permissive are SATISFIED.
All local line ups are COMPLETE
5.For starting first CEP
Checks at UCB
CHECK if all start permissive for starting CEP is satisfied.
Hot well level is ADEQUATE (UCB Indicator).
Bearing temperature of CEPs is NOT HIGH 60 0 C.) UCB indications.
CEP re-circulation valve is OPEN.
Hotwell level controller output is zero.
CEP electrical supply is AVAILABLE.
Deaerator inlet valve is OPEN.
CEP header vents and line vents OPEN.
HW level controller, DA level controller and cycle make-up controller valves are CLOSED.
Bypass valves of HW, DA and cycle make-up controllers are also CLOSED.
Local operator intimated prior to starting of pump.
Checks at UCB
CHECK if all start permissive for starting CEP is satisfied.
Hot well level is ADEQUATE (UCB Indicator).
Bearing temperature of CEPs is NOT HIGH 60 0 C.) UCB indications.
CEP re-circulation valve is OPEN.
Hotwell level controller output is zero.
CEP electrical supply is AVAILABLE.
Deaerator inlet valve is OPEN.
CEP header vents and line vents OPEN.
HW level controller, DA level controller and cycle make-up controller valves are CLOSED.
Bypass valves of HW, DA and cycle make-up controllers are also CLOSED.
Local operator intimated prior to starting of pump.
6.For starting first BFP
Checks at LOCAL
No maintenance staff is working.
All control and measuring instruments are in place.
Check availability of compressed air for pneumatically operated valves.
Check that Deaerator level is normal. Make local check and confirm by draining the gauge glass and recharging it.
BFP suction v/v is fully open.
BFP booster pump suction pressure is ADEQUATE (>3.0 KSC).
BFP motor air box cooling water-inlet/ outlet manual valves are OPEN.
BFP suction strainer DP is not more than 0.2 Kg/cm2
BFP manual re-circulation valves at the Deaerator are 100% OPEN.
Check that oil level in lub. oil tank is normal.
Take out EPB of auxiliary lub. oil pump. Confirm that it starts and develops required lub. oil pressure. Check lub. oil flow through drain line is normal. Check that both lub. oil and working oil coolers are charged from water as well as oil side.
Check BFP discharge valve & its bypass valve is closed.
All air vents on suction and discharge lines of BFP and feed regulating station are OPEN.
Check that drain valves are closed.
Take out EPB of main pump and give clearance to UCB for starting.
Checks at LOCAL
No maintenance staff is working.
All control and measuring instruments are in place.
Check availability of compressed air for pneumatically operated valves.
Check that Deaerator level is normal. Make local check and confirm by draining the gauge glass and recharging it.
BFP suction v/v is fully open.
BFP booster pump suction pressure is ADEQUATE (>3.0 KSC).
BFP motor air box cooling water-inlet/ outlet manual valves are OPEN.
BFP suction strainer DP is not more than 0.2 Kg/cm2
BFP manual re-circulation valves at the Deaerator are 100% OPEN.
Check that oil level in lub. oil tank is normal.
Take out EPB of auxiliary lub. oil pump. Confirm that it starts and develops required lub. oil pressure. Check lub. oil flow through drain line is normal. Check that both lub. oil and working oil coolers are charged from water as well as oil side.
Check BFP discharge valve & its bypass valve is closed.
All air vents on suction and discharge lines of BFP and feed regulating station are OPEN.
Check that drain valves are closed.
Take out EPB of main pump and give clearance to UCB for starting.
7.BOILER FEED PUMP
For starting first BFP
Checks at UCB
No PTW is pending.
Check feed pump gauges in UCB are in proper working order.
Check all remote operated valves have been given power supply & confirm their proper operation with local operator.
Check D/A level is normal.
Check lub. oil pressure is O.K.
Check all the protection and interlocks of the pump have been checked and found O.K.
Check feed water line has been properly lined up.
Feed regulating station control valve are in CLOSED position.
Check the valve indications (OPEN/CLOSE) are O.K.
BFP pneumatic recirculation valve is 100% OPEN.
Check scoop tube is in minimum position.
Get electrical supply for the pump.
Check all the flag relay provided for the pump are reset.
Check that the boiler requires feed water.
Announce for feed pump starting &. ask local operator to be near pump.
For starting first BFP
Checks at UCB
No PTW is pending.
Check feed pump gauges in UCB are in proper working order.
Check all remote operated valves have been given power supply & confirm their proper operation with local operator.
Check D/A level is normal.
Check lub. oil pressure is O.K.
Check all the protection and interlocks of the pump have been checked and found O.K.
Check feed water line has been properly lined up.
Feed regulating station control valve are in CLOSED position.
Check the valve indications (OPEN/CLOSE) are O.K.
BFP pneumatic recirculation valve is 100% OPEN.
Check scoop tube is in minimum position.
Get electrical supply for the pump.
Check all the flag relay provided for the pump are reset.
Check that the boiler requires feed water.
Announce for feed pump starting &. ask local operator to be near pump.
8.START BFP
Check starting current and time.
Check that recirculation valve opens and proper suction flow in maintained.
Check electrically operated cooling water valve opens & proper cooling water flow is established.
Check warm up valve has closed.
Check auxiliary lub. oil pump has stopped.
Check feed pump vibration are normal (local check)
Check balancing leak off’ chamber pressure is normal.
Check bearing temperatures of main pump, motor and hydraulic coupling bearings are normal.
INSTRUCT Local operator to check bearing vibration and temperatures locally
Command is given for opening of main pump discharge valve first integral bypass v/v Opens and their after main v/v opens up. the feed pump
Suction flow increases to 150 T/Hr. approximately.
Check starting current and time.
Check that recirculation valve opens and proper suction flow in maintained.
Check electrically operated cooling water valve opens & proper cooling water flow is established.
Check warm up valve has closed.
Check auxiliary lub. oil pump has stopped.
Check feed pump vibration are normal (local check)
Check balancing leak off’ chamber pressure is normal.
Check bearing temperatures of main pump, motor and hydraulic coupling bearings are normal.
INSTRUCT Local operator to check bearing vibration and temperatures locally
Command is given for opening of main pump discharge valve first integral bypass v/v Opens and their after main v/v opens up. the feed pump
Suction flow increases to 150 T/Hr. approximately.
9.RAISE BFP scoop tube position to get desired feed water.
BFP discharge pressure rises. If on auto BFP scoop tube can be operated through BFP master.
Re-circulation valve auto release becomes available, if BFP flow exceeds 150 T/Hr.
OPEN feed regulating station low range controllers isolating valves.
Open feed regulating station control valves as per the feed water requirement in the boiler.
10.WHEN ONE PUMP IS RUNNING
CHECKS before starting the second BFP.
All pre-start checks are OVER.
All BFP start Permissive is AVAILABLE.
BFP main discharge valve OPEN.
Aux. oil pump is ON and lub oil pressure is ADEQUATE.
BFP scoop tube position is MINIMUM
BFP selector switch is on NORMAL.
START the BFP motor.
BFP scoop tube controller transfers to auto and follows master controller output.
Motorised cooling water valve, open up.
BFP aux. oil pump trips automatically as the main oil pump takes over.
Re-circulation flow control transfers to auto.
ADJUST scoops of the two running BFPs to equalise loads.
ADJUST BFP bias to 50% and ADJUST BFP master controller equal to BFPs scoop tube position.
TRANSFER running BFP SCOOP control to auto.
BFP discharge pressure rises. If on auto BFP scoop tube can be operated through BFP master.
Re-circulation valve auto release becomes available, if BFP flow exceeds 150 T/Hr.
OPEN feed regulating station low range controllers isolating valves.
Open feed regulating station control valves as per the feed water requirement in the boiler.
10.WHEN ONE PUMP IS RUNNING
CHECKS before starting the second BFP.
All pre-start checks are OVER.
All BFP start Permissive is AVAILABLE.
BFP main discharge valve OPEN.
Aux. oil pump is ON and lub oil pressure is ADEQUATE.
BFP scoop tube position is MINIMUM
BFP selector switch is on NORMAL.
START the BFP motor.
BFP scoop tube controller transfers to auto and follows master controller output.
Motorised cooling water valve, open up.
BFP aux. oil pump trips automatically as the main oil pump takes over.
Re-circulation flow control transfers to auto.
ADJUST scoops of the two running BFPs to equalise loads.
ADJUST BFP bias to 50% and ADJUST BFP master controller equal to BFPs scoop tube position.
TRANSFER running BFP SCOOP control to auto.
11.BFP SHUTDOWN PROCEDURE
TRANSFER scoop control of the BFP to manual.
BFP master also transfers to manual.
REDUCE scoop tube controller of the BFP to minimum position.
BFP discharge pressure and flow start decreasing
STOP the BFP motor.
BFP motor breaker opens.
BFP re-circulation valve opens 100%
Motorised cooling water valve starts closing.
If no other BFP is in service the discharge valves of all BFPs start closing.
Close the BFP suction valve and rack out breaker if any maintenance to be carried out.
TRANSFER scoop control of the BFP to manual.
BFP master also transfers to manual.
REDUCE scoop tube controller of the BFP to minimum position.
BFP discharge pressure and flow start decreasing
STOP the BFP motor.
BFP motor breaker opens.
BFP re-circulation valve opens 100%
Motorised cooling water valve starts closing.
If no other BFP is in service the discharge valves of all BFPs start closing.
Close the BFP suction valve and rack out breaker if any maintenance to be carried out.
12.VACUUM PULLING
CHECK before starting vacuum pulling operation.
Auxiliary steam header charged and its pressure ADEQUATE.
Ejector PRDS is CHARGED and Ejector steam pressure is ADEQUATE ( 7.5 Kg/cm2)
At least one condensate pump is ON.
Main ejectors and GSC CHARGED from the waterside.
Condenser air valve air valves to main ejectors are OPEN.
CHECK before starting vacuum pulling operation.
Auxiliary steam header charged and its pressure ADEQUATE.
Ejector PRDS is CHARGED and Ejector steam pressure is ADEQUATE ( 7.5 Kg/cm2)
At least one condensate pump is ON.
Main ejectors and GSC CHARGED from the waterside.
Condenser air valve air valves to main ejectors are OPEN.
13.CHECK before starting vacuum pulling operation.
Surge tank level ADEQUATE.
Condenser siphon filling COMPLETED.
Condenser vacuum breaker valve must be CLOSED. Water sealing done.
Condenser inlet & outlet valves are CLOSED.
Steam line drains to flash tank, are CLOSED
MOT level is NORMAL and "MOT level low" alarm is RESET.
At least one MOT vapour extractor fan is ON.
Generator hydrogen pressure must be 3.5 Kg/cm2.
Generator hydrogen purity > 97%.
Surge tank level ADEQUATE.
Condenser siphon filling COMPLETED.
Condenser vacuum breaker valve must be CLOSED. Water sealing done.
Condenser inlet & outlet valves are CLOSED.
Steam line drains to flash tank, are CLOSED
MOT level is NORMAL and "MOT level low" alarm is RESET.
At least one MOT vapour extractor fan is ON.
Generator hydrogen pressure must be 3.5 Kg/cm2.
Generator hydrogen purity > 97%.
14.SWITCH-ON SLCs of AOPs, JOPs, EOP, Gate valve gearing and the Lub. Oil temp controller.
Turbine starts barring at 110 rpm approximately.
Lub oil temperature controller modulates to maintain set lub oil temperature.
CHARGE condenser priming ejector from steam & airside. Condenser water box priming initiated.
INSTRUCT local operator to start one CW pump and CHARGE both condensers 50 % approx., to curb CW power consumption.
CW header pressure increases, slightly.
Condenser inlet & outlet valves are partially opened.
Condenser flow starts increasing.
Turbine starts barring at 110 rpm approximately.
Lub oil temperature controller modulates to maintain set lub oil temperature.
CHARGE condenser priming ejector from steam & airside. Condenser water box priming initiated.
INSTRUCT local operator to start one CW pump and CHARGE both condensers 50 % approx., to curb CW power consumption.
CW header pressure increases, slightly.
Condenser inlet & outlet valves are partially opened.
Condenser flow starts increasing.
15.CUTOUT the priming ejector after CW water starts coming from the air vents of priming ejector.
Priming ejector's steam airside valves are closed.
OPEN seal steam line and header drains & CHARGE gland sealing steam into the turbine glands.
Gland seal steam control opens up and gland steam header pressure starts increasing.
TRANSFER seal steam control to auto.
CHARGE starting ejector by opening ejector’s steam supply & air suction valve.
Condenser vacuum starts increasing to 0.7 Kg/cm2.
OPEN steam supply valve to any one main ejector as per desired vacuum.
Vacuum builds up to 0.92 Kg/cm2 i.e 72 mm Hg (approx)
Turbine barring speed increases up to 220-RPM approx.
"Condenser vacuum low" alarm gets cleared off.
Priming ejector's steam airside valves are closed.
OPEN seal steam line and header drains & CHARGE gland sealing steam into the turbine glands.
Gland seal steam control opens up and gland steam header pressure starts increasing.
TRANSFER seal steam control to auto.
CHARGE starting ejector by opening ejector’s steam supply & air suction valve.
Condenser vacuum starts increasing to 0.7 Kg/cm2.
OPEN steam supply valve to any one main ejector as per desired vacuum.
Vacuum builds up to 0.92 Kg/cm2 i.e 72 mm Hg (approx)
Turbine barring speed increases up to 220-RPM approx.
"Condenser vacuum low" alarm gets cleared off.
16.ISOLATE starting ejector by closing air suction valve first and then steam supply valve.
MAINTAIN rated condenser vacuum of 73 mm Hg (back pressure)
Condenser vacuum is maintained at 0.92 Kg/cm2.
MAINTAIN rated condenser vacuum of 73 mm Hg (back pressure)
Condenser vacuum is maintained at 0.92 Kg/cm2.
17. CHECK before charging HP/LP bypass system.
M S pressure 12 Kg/cm2 CRH and HRH steam line drains are OPEN.
HP bypass oil unit's oil level NORMAL, its Pump ON and its pressure ADEQUATE.
LP bypass rack is LINED UP and all setting & tripping values checked.
HP bypass downstream temperature set point is at 200 O C approx.
HP bypass spray pressure set point: 70 Kg/cm2.
All isolating valves before the spray pressure controller are OPEN.
HP bypass upstream
pressure (main steam pressure) set point is at 10 Kg/cm2.
18.HP AND LP BYPASS CHARGING
TRANSFER LP bypass control to auto and SWITCHON the Automatic Control Interface (ACI).
HRH fixed set point comes to 3 Kg/cm2.
TRANSFER HP BP control to auto.
HP bypass valves (BP-1/BP-2) start opening if MS pr. is more than the set point.
CRH pressure starts increasing.
HP bypass temp controller and spray pressure controller transfer to auto and maintain set values of downstream temp & spray pressure.
ADJUST main steam pressure set point to obtain desired MS pressure.
HP bypass valves open or close, depending on whether set point is less or more than the MS pressure respectively.
19.CRITERIA FOR COLD WARM AND HOT STAR UP
M S pressure 12 Kg/cm2 CRH and HRH steam line drains are OPEN.
HP bypass oil unit's oil level NORMAL, its Pump ON and its pressure ADEQUATE.
LP bypass rack is LINED UP and all setting & tripping values checked.
HP bypass downstream temperature set point is at 200 O C approx.
HP bypass spray pressure set point: 70 Kg/cm2.
All isolating valves before the spray pressure controller are OPEN.
HP bypass upstream
pressure (main steam pressure) set point is at 10 Kg/cm2.
18.HP AND LP BYPASS CHARGING
TRANSFER LP bypass control to auto and SWITCHON the Automatic Control Interface (ACI).
HRH fixed set point comes to 3 Kg/cm2.
TRANSFER HP BP control to auto.
HP bypass valves (BP-1/BP-2) start opening if MS pr. is more than the set point.
CRH pressure starts increasing.
HP bypass temp controller and spray pressure controller transfer to auto and maintain set values of downstream temp & spray pressure.
ADJUST main steam pressure set point to obtain desired MS pressure.
HP bypass valves open or close, depending on whether set point is less or more than the MS pressure respectively.
19.CRITERIA FOR COLD WARM AND HOT STAR UP
20.TURBINE START- UP
CHECK that all the turbo-Supervisory instrumentations are functional.
All UCB indicators and recorders are functional and healthy.
All recorders are inked and all instruments are calibrated.
CHECKS before starting the turbine run-up
Electro-hydraulic controller for turbine is ON.
EHC isolating valves on sec oil lines to control valves are open.
Electro-hydraulic controller's output is zero.
"EHC control fault" and "EHC Plunger coil off" alarms do not appear in the UCB.
Speed reference set point for the Speed Controller is zero or less than the barring speed.
CHECK that all the turbo-Supervisory instrumentations are functional.
All UCB indicators and recorders are functional and healthy.
All recorders are inked and all instruments are calibrated.
CHECKS before starting the turbine run-up
Electro-hydraulic controller for turbine is ON.
EHC isolating valves on sec oil lines to control valves are open.
Electro-hydraulic controller's output is zero.
"EHC control fault" and "EHC Plunger coil off" alarms do not appear in the UCB.
Speed reference set point for the Speed Controller is zero or less than the barring speed.
21. Load reference set point for the Load Controller and the load limiter output are zero.
Speeder gear position is 100%.
Starting device is at 0% position.
The alarms "TSE influence off" "Turbine stress effects off" and "Turbine stress cubicle fault" are not on.
TSE influence is ON.
Unit trip relay (A & B) are in RESET condition
"Turbine Trip" and "Turbine Trip gear operated" alarms are not on and Trip oil pressure > 5 Kg/cm2
All differential expansions of the turbine are NORMAL and within the alarms values.
22.X1 CURVE IS STEAM TEMP BEFORE HPBYPASS/MIDWALL HPCV
X2 CURVE IS MAIN STEAM TEMP BEFORE HPCV/MIDWALL HPCV
X3 CURVE IS STEAM TEMP BEFORE HPCV/ MAINSTEAM SATURATION TEMP
X4 CURVE IS MAIN STEAM TEMP BEFORE HPESV/MIDWALL HPCASING
X5 CURVE IS HRH TEMP BEFORE LP BYPASS/MIDWALL IP SHAFT
X6 CURVE IS MAIN STEAM TEMP BEFORE HP BYPASS/MIDWALL HPCASING
X7 CURVE IS HRH TEMP BEFORE LP BYPASS/MIDWALL IP CASING
Speeder gear position is 100%.
Starting device is at 0% position.
The alarms "TSE influence off" "Turbine stress effects off" and "Turbine stress cubicle fault" are not on.
TSE influence is ON.
Unit trip relay (A & B) are in RESET condition
"Turbine Trip" and "Turbine Trip gear operated" alarms are not on and Trip oil pressure > 5 Kg/cm2
All differential expansions of the turbine are NORMAL and within the alarms values.
22.X1 CURVE IS STEAM TEMP BEFORE HPBYPASS/MIDWALL HPCV
X2 CURVE IS MAIN STEAM TEMP BEFORE HPCV/MIDWALL HPCV
X3 CURVE IS STEAM TEMP BEFORE HPCV/ MAINSTEAM SATURATION TEMP
X4 CURVE IS MAIN STEAM TEMP BEFORE HPESV/MIDWALL HPCASING
X5 CURVE IS HRH TEMP BEFORE LP BYPASS/MIDWALL IP SHAFT
X6 CURVE IS MAIN STEAM TEMP BEFORE HP BYPASS/MIDWALL HPCASING
X7 CURVE IS HRH TEMP BEFORE LP BYPASS/MIDWALL IP CASING
23.TURBINE ROLLING PROCEDURE
Maintain boiler side steam parameters as required for turbine start-up.
The MS/HRH temp and pressures are within the determined ranges.
HRH steam pressure should not be more than 15 Kg/cm2 during rolling.
RAISE starting device to 70% gradually.
Start-up oil pr. Falls to 1.8 KSC and HP ESVs (1&2) open 100% at 42% position of starting device.
Interceptor stop valves (1&2), open 100% at 56% position of starting device.
Start-up oil pre. = 0 at 70% of starting device position. Aux Sec oil pressure increases up to 4 KSC.
24.SWITCH ON SLC "Warm-up controller“ is required (during cold rolling)
Drains before HP control valves, (HPCV-1/2), start opening, 100%.
HP ESVs and control valves, heating starts and their respective temp. start increasing.
Surface and mean temp start rising.
Wait until the mean temperatures of HPCVs come to min. 200 - 250 oC.
Min. temp requirement for HPSV/HPCV is only for absolute cold startups
Upper TSCmargin for admission channel starts droping slowly & after minimum temp are attained, starts improving again.
Maintain all TSE margins of Admission channel > 30 K.
The metal temperatures of ESV/CV body are within 30oC of the MS temp preferably.
The heating-up of stop/control valves is complete.
RAISE speed reference set point to 600 rpm.
EHC starts increasing from its initial zero position.
Speed controller is in action during turbine rolling.
Maintain boiler side steam parameters as required for turbine start-up.
The MS/HRH temp and pressures are within the determined ranges.
HRH steam pressure should not be more than 15 Kg/cm2 during rolling.
RAISE starting device to 70% gradually.
Start-up oil pr. Falls to 1.8 KSC and HP ESVs (1&2) open 100% at 42% position of starting device.
Interceptor stop valves (1&2), open 100% at 56% position of starting device.
Start-up oil pre. = 0 at 70% of starting device position. Aux Sec oil pressure increases up to 4 KSC.
24.SWITCH ON SLC "Warm-up controller“ is required (during cold rolling)
Drains before HP control valves, (HPCV-1/2), start opening, 100%.
HP ESVs and control valves, heating starts and their respective temp. start increasing.
Surface and mean temp start rising.
Wait until the mean temperatures of HPCVs come to min. 200 - 250 oC.
Min. temp requirement for HPSV/HPCV is only for absolute cold startups
Upper TSCmargin for admission channel starts droping slowly & after minimum temp are attained, starts improving again.
Maintain all TSE margins of Admission channel > 30 K.
The metal temperatures of ESV/CV body are within 30oC of the MS temp preferably.
The heating-up of stop/control valves is complete.
RAISE speed reference set point to 600 rpm.
EHC starts increasing from its initial zero position.
Speed controller is in action during turbine rolling.
25.HP CVs start opening.
Turbine speed starts rising to 600 rpm at a rate selected by TSE.
The gate valve for turbine barring starts closing when turbine speed comes to 240 rpm. "Gate valve gearing not closed" alarm starts flashing and resets after the valve gets fully closed.
The JOP trips in auto as the turbine speed comes to 540 rpm.
MAINTAIN turbine speed and soak till required HP shaft temp is attained.
DT (MS temp. – Mean HP shaft temp) becomes less than the value specified by turbine start-up curve X-6.
Maintain all TSE margins more than 30 K.
RAISE turbine speed reference set point to 3030 rpm.
Turbine EHC's output starts increasing slowly.
Turbine control valves (HPCV & IPCV) start opening more.
26.TURBINE ROLLING PROCEDURE
DT (HRH steam temp- Mean IPS temp) becomes less than the value specified by turbine startup curve X-7.
CHECK all the turbine / generator parameters before synchronisation.
All bearing pedestal vibration is less than 35 microns.
All relative shaft vibrations are less than 150 microns
All bearing babbit metal temp are less than 80 oC
Bearing return oil flow is normal and temp < 77 oC.
All casing absolute expansions are within normal range. HPT - < 15 mm. IPT - < 10 mm.
Thrust bearing oil filters are clean (not choked).
Axial shift < + 0.3 mm.
Turbine casing top/ bottom temperature is< 30 oC.
Condenser vacuum is normal at 0.92 Kg/cm2
Gen hydrogen pressure is normal at 3.5 KSC
Stator water flow is More than 27 m3/Hr.
Stator water specific conductivity is less than 5 micro mho/cm.
Seal oil to hydrogen DP is normal (1.2-1.50 Kg/cm2).
Turbine speed starts rising to 600 rpm at a rate selected by TSE.
The gate valve for turbine barring starts closing when turbine speed comes to 240 rpm. "Gate valve gearing not closed" alarm starts flashing and resets after the valve gets fully closed.
The JOP trips in auto as the turbine speed comes to 540 rpm.
MAINTAIN turbine speed and soak till required HP shaft temp is attained.
DT (MS temp. – Mean HP shaft temp) becomes less than the value specified by turbine start-up curve X-6.
Maintain all TSE margins more than 30 K.
RAISE turbine speed reference set point to 3030 rpm.
Turbine EHC's output starts increasing slowly.
Turbine control valves (HPCV & IPCV) start opening more.
26.TURBINE ROLLING PROCEDURE
DT (HRH steam temp- Mean IPS temp) becomes less than the value specified by turbine startup curve X-7.
CHECK all the turbine / generator parameters before synchronisation.
All bearing pedestal vibration is less than 35 microns.
All relative shaft vibrations are less than 150 microns
All bearing babbit metal temp are less than 80 oC
Bearing return oil flow is normal and temp < 77 oC.
All casing absolute expansions are within normal range. HPT - < 15 mm. IPT - < 10 mm.
Thrust bearing oil filters are clean (not choked).
Axial shift < + 0.3 mm.
Turbine casing top/ bottom temperature is< 30 oC.
Condenser vacuum is normal at 0.92 Kg/cm2
Gen hydrogen pressure is normal at 3.5 KSC
Stator water flow is More than 27 m3/Hr.
Stator water specific conductivity is less than 5 micro mho/cm.
Seal oil to hydrogen DP is normal (1.2-1.50 Kg/cm2).
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