Nitin patel WTPS

1. Gujarat State Electricity Corporation Ltd.
Thermal Power Station WTPS
 TURBINE ROLLING AND GOVERING SYSTEM
• NITIN S PATEL
• DE
• OPERATION STAGE I
1NS PATEL

2. 210 MW LMW TURBINE
The turbine is three cylinder, horizontal diaphragm type with nozzle governing
and regenerative feed heating. The double flow LP turbine.
Boiler enters in two Emergency Stop Valves (ESVs) of high pressure turbine.
From ESV, steam flows to four Control Valves (CVs) mounted on the casing.
of High Pressure Turbine(HPT) at the central pedestal side
High pressure turbine comprises 12 stages , first stage being governing
stage. The steam flow in HPT being in reverse direction . The blades in HPT
are designed for anticlockwise rotation, when viewed in direction of steam
flow
The intermediated pressure turbine has 11 stages . HP & IP rotors are
connected by rigid coupling and have a common bearing
After flowing through IPT, steam enters the middle part of low pressure turbine
through two cross over pipes. In Low Pressure Turbine (LPT) 08 stages.

3. In order to heat the feed water in the regenerative cycle of the turbine ,
condensate from the hot well of condenser is pumped by the Condensate
Extraction Pump ( CE Pumps ) and supplied at the Deaerator through
Ejectors, Gland Steam Cooler, four number L.P. Heaters and Gland Cooler.
From Deaerator , the feed water is supplied to boiler by boiler feed pumps
through three number H.P. heaters. Extracted steam from various points of
the turbine is utilized to heat the condensate in these heat exchangers.
TURBINE MAIN DATA:
Rated output of the Turbine : 210 MW.
Rated Speed : 3000 rpm.
Rated pressure of steam before ESV : 130 kg/cm2.
Rated live steam temperature : 535 °C
Rated live steam temperature at inlet of IV : 535 °C
Steam flow at valve wide open condition : 670 Tons/hr.
Rated CW flow through condenser : 27000 M 3 / hr.

4. Cold start( when casing temperature is less than 150°c)
Worm start (when casing temperature is between 150°c to 350°c)
Hot start (when casing temperature is more than 350°c)
Eccentricity of the rotor at barring gear speed is more than 0.07 mm
For a healthy turbine normally the vibrations are less than 40 microns
Turn the speeder gear hand wheel in anti-clockwise direction and CHECK THAT following
events occurs:
Reading on the scale of Event
Speeder gear drum
4.6 mm Interceptor valves begin to open
5.5 mm Emergency stop valves begin to open
5.9 mm Interceptor valves fully open
6.65 mm Emergency stop valves fully open
9.6 mm Control valves begin to open
12.8 mm All control valves fully open.

5. Droop Calculation
• FLY BALL GOVERNING SYSTEM
• 120. F = 3000 RPM
p
• 50% 2900= 3.3 %
• 33% 2850 = 5.0 % ( all M/C)
• 25% 2800 = 6.66 %
• 0- 125 IP control valve All
• 125-230 HP control valve 1 & 2
• 230-270 HP control valve 3
• 270 to 300 HP control valve 4
5
% Droop
No Load Speed - Full Load Speed
Rated Speed
X 100=

6. Steam generation principle
 Steam power plants operate on
Rankine Cycle, DM water as
working fluid.
 Sensible heat is added in
economizer +furnace
 Steam generation takes place in
water wall.
condenser
CEP
LPH
BFP
HPH+Eco
w/w
SH
HPT
IPT
RH
LPT

7. INTERLOCK & PROTECTION OF TURBINE :
Turbine lockout relay (TLR) will trip if,
Unit Lockout Relay trips (ULR).
Master Fuel Relay trips (MFT)
Oil level in damper tank is very low.
DM cooling Water flow to stator winding is less than 13 M³ / hr.
DM cooling water specific resistivity is less than 50K. ohm/cm.
Condenser vacuum is less than 540 mm of Hg.
Boiler drum level is very high / low.
H.P. turbine exhaust temperature is above 420 °C.
H.P. heater level is very high
Lub oil pressure is low 0.3 kg/cm² ).

8. Shaft axial shift is high ( +1.2 , – 1.7 mm.).
‘Low lub oil pr.’ & ‘High axial shift ‘ will also operate the following valves as
under :
Open Vacuum Breaker.
Close steam to main ejectors.
Close steam to starting ejector.
Open air extraction valve of starting air ejector
The following condition will close the turbine ESVs and IVs :
Turbine Trip solenoid (TTS) operated.
Turbine over-speed trip operated ( 11- 12 %) .
Turbine over-speed trip addl. Protection operated ( 15% ).
Turbine relay oil pressure is less than 10 kg/cm2.
Turbine Manual Trip operated

9. COLD START UP OF TURBINE
The turbine is considered to be cold if the temperature of lower part of HPT casing is
less than 150 0C.
ECCENTRICITY :
Eccentricity of the rotor in barring speed is more than 0.07 mm.
During steam rolling , if the readings as indicated on eccentricity meter exceed 0.20
mm ( 200 micron) , the turbine should be shut down and put on barring gear and
cause of excessive indication be investigated.
BEARING VIBRATION
For healthy turbine, normally the vibrations are less than 40 microns
Critical speed of the shaft system are given below :
I II III IV V
1585 1881 2017 2489 4500

10. METAL TEMPERATURE:
While heating the casing of ESV, HPT & IPT and also while increasing speed and
loading turbine, metal temperature should be raised gradually, avoiding sudden
sharp rises. The rate of rise of metal temperature should not exceed the limits given
below :
Temperature Rate
From 100 to 200 °C 20 °C per minute
From 200 to 300 °C 15 °C per 5 minute
From 300 to 400 °C 10 °C per 5 minute
From 400 to 500 °C 10 °C per 10 minute
From 500 to 535 °C 6 °C per 10 minute
The rate of heating of steam pipes should not exceed 25-30 0C per five minutes.

11. While heating the main steam and reheat steam pipes, the difference in temperature
of pipes should not exceed 150C. But when the turbine is on load , this difference
should not be more than 100C. While raising the speed of set up to 3000 rpm the
difference of metal temperature between the left hand and right hand ESV should
not exceed 30 0 C.
The temperature difference between the upper and lower halves of HPT & IPT casing
should not exceed 50 0C near the regulation stage in case of HPT and near the zone
of steam admission in case of IPT.
Temperature difference between upper and lower flanges does not exceed 10 0C .

12. DIFFERENTIAL EXPANSION :
It is prohibited to raise the speed of turbine rotor or the load if the relative expansion (+) or
contraction (-) of the rotor reaches the maximum permissible values given below :
For Rotor of HPT: (+) 4.0 mm or (-) 1.2 mm
For Rotor of IPT : (+) 3.0 mm or (-) 2.5 mm
For Rotor of LPT: (+) 4.5 mm or (-) 2.5 mm
(+) sign indicates that Rotor is longer than cylinder and vice versa for (-) sign.
In case of further increase in the differential expansion of rotor, stop further increase in live
steam temperature and suspend further loading. If measures mentioned above are not
sufficient, decrease the live steam temperature.
If HP rotor contracts quicker than the HP casing increase temperature of live steam and
increase load or supply fresh steam to the front sealings of HPT and the entry of leak-off
steam into heater no. 4.
If IP rotor expands quicker than the IP cylinder, stop the increase the temperature of steam
after reheat or lower its temperature. If these measures are not sufficient, stop the increase
in load too.

13. Bearing No.1
IP overall Expansion
Bearing No.2 Bearing No.3 Bearing No.4 Bearing No.5
HP overall Expansion
HPT DIFF
EXPANSION
IPT DIFF
EXPANSION
LPT DIFF
EXPANSION
AXIAL SHIFT
LP overall Expansion
HPT DIFF -1.2 TO 4.0 MM
IPT DIFF – 2.5 TO 3.0 MM
LPT DIFF -2.5 TO 4. MM
AXIAL SHIFT +1.2 TO -1.7 MM
HPT DIFF – 0.8 MM give Rotor heating
IPT DIFF – 1.50 MM give Rotor heating
LPT DIFF - ve sign improve vacuum

14. If IP rotor contracts quicker than the IP casing , increase temperature of steam after reheater
and increase load or supply fresh steam to the front sealings of IPT and the entry of leak-off
steam into heater no. 4
If LP rotor expands quicker than the LPT cylinder, worsen the vacuum and stop recirculation
of condensate in the condenser.
If LP rotor contracts quicker than the LP casing, improve vacuum in the condenser.
During heating , speeding and loading of turbine, carefully watch the readings of the
instruments indicating :
Vibration of bearings.
Axial shift of rotors.
Differential expansion of all the three rotors.
Metal temperature of upper and lower halves of HPT flanges and studs and upper half of IPT
flanges.
Oil temperature at the inlet and outlet of the bearings.
Babbit temperature of thrust bearings.
Pressure and temperature of steam at the control panel.

15. HPT
IPT
LPT
m m
LPH-4
GC-II
AS-39 AS-40
40 Kg/cm²AS-1
AS-2
AS-3
AS-4
AS-5 AS-6
AUXI PRDS
GC-I
210MW LMZ TURBINE GLAND SEALING SYSTEM
07 kg/cm²
m
CONDENSOR
ES-12

16. Line up of turbine , MS, CRH and HRH lines :
MS Line, In-between drain, HP- bypass up/down steam drain valves.
HRH, CRH, LP –bypass drain valves to flash box.
PRDS, Gland seal steam supply line and ejector line drains.
HP and IP cylinder steam loop drains to flash box.
HPT and IPT cylinder drains.
Before drain of extraction NRV of extraction line to HP heater no. 7 & 5 to flash box.
Before drain of extraction NRV of extraction to LP heater no. 2, 3 & 4 to flash box.

17. The following valves are to be kept closed :
Main steam stop valve (turbine side).
Main steam stop valve bypass isolating and regulating valves.
ESV, IV and control valves of HPT and IPT.
Before isolating valve of gland steam controller.
Before isolating steam valve of GC-1 ejector.
First isolating steam valve of starting and main steam ejectors.
After ensuring the closing and opening of all the above the following procedure are
to be followed:
Open Main steam stop valve (Boiler end) equalizer both side when M.S. pressure is
10 kg/cm2. and temperature is around 200 0 C
after opening drains of CHR/HRH line, slowly charge the turbine auxiliary steam line
by opening HP BYPASS controller (5-10%) and after sometime increase the pressure.
Check that operation and LP Bypass Full Open condition

18. Charge the steam supply header to turbine gland sealing and air ejector from PRDS
for heating the lines. Check that line drains are operating.
Maintain MS Lines pressure at 14 kg/cm2 and temperature at 220 0C by raising MS
pressure at 25 kg/cm2 and temperature at 280 0 C
Start starting Oil pump and maintain oil temperature at around 42 0 C
VACUUM PULLING :
Close Reheater vents of Boiler and atmospheric drain of HRH and CRH drains
Close vacuum breaker (CA-6).
Open first isolating valve to ejectors
Open steam valve to starting ejector and maintain steam pressure at 7.0 kg/cm2and
open air off-take valves CA valves
When condenser vacuum reaches to 150 mm of Hg, charge the turbine gland steam
and maintain the gland the gland steam header pressure at 0.10 to 0.15 kg/cm2.
Charge GC-1 steam side to maintain the GC-1 vacuum 60-80 mm hg by maintaining
steam pressure 1.5 to 3.0 kg/cm2. Before charging the GC-1

19. When vacuum reaches to 400 mm Hg open MC-49 and MC-50 ( Condensate line to
condenser steam throwing device (STD)
Check that the HPT evacuating valves CA-21, 22 and bypass valves across CRH line
NRV’s (Ex-20, 21) are closed
Open LP bypass and HP bypass valves manually about 5% and allow the steam to
flow in HP / LP bypass
HP bypass up stream pressure at 25 kg/cm2 and LP bypass upstream pressure at 0.5
kg/cm2 and Temperature of MS should be maintained around 300 0C
When MS line metal temperature before ESV have reached to 270 0C and super
heater outlet temperature of steam is above 50 0C superheat , open bypass valves of
MSV for heating the pipe line up to turbine
Open bypass valves across NRV’s in CRH (ES-20,21) and heat HP turbine up to a
temperature of 150 0C. close CA-21 and CA-22
Open both the ESVs by 10-20 mm as per scale by operating the hand wheel and
heat ESV body steam pipe up to HPT control valves to 150 °C. While opening ESVs,
care should be taken so that the HPT control valves closed and steam Loop drains to
flash box are open

20. Open both side IV about 10-15 mm as per scale by opening the hand wheel and heat
the steam loops up to CVs up to 80 0C. Care should be taken so that during this
operation IPT CVs remain closed and the steam loop drains to flash box are open.
Check the steam pressure in HRH line, which should be less than 1 kg/cm2 before
starting the heating of steam loops up to control valves (CVs) at IPT. If the pressure in
the line is more than 1 kg/cm2, adjust and reduce the pressure by opening the LP
bypass valve manually
The said CVs of IPT have been provided within built relief holes through which steam
leaks into IPT which may cause disengagement of rotor from barring gear, if the
pressure in hot reheat line exceeds 1 kg/cm2
The steam parameters at MSV by this time shall be 25 kg/cm2 and temperature of
300 0C
Close ESV and IV by operating the hand wheel, Close Speeder Gear to Zero position
When pressure in the RH line comes to condenser pressure, manually close the LP
bypass valves. Thus bypass stations are manually closed before admitting steam in
the turbine for rolling the set.

21. Metal temperature of pipes before MSV.
Metal temperature of ESV.
Metal temperature of steam admission lines of HPT & IPT.
Metal temperature of HR lines.
Metal temperature in the zone of regulating stage.
Metal temperature of IV.
Steam pressure and temperature before MSV,
Differential expansion of HP, IP & LP rotors. Axial shift.
HPT and IPT overall expansion
Before rolling turbine, ensure that condensate level, Deaerator level and drum level
are within allowable limits.
Check that the eccentricity of the rotor is within limit (less than 70 microns).
Open CVs of HPT and IPT completely, with the help of speeder gear.

22. TURBINE IS READY FOR ROLLING:
Open the MSV bypass isolating valves of both sides.
Open the bypass regulating valve slowly thereby allowing steam to roll the turbine.
Being certain the turbine is in healthy condition, again raise the speed to 500 rpm by
opening the regulating valve and soak the set for 10 minutes at this speed.
Smoothly raise the speed to 1000 rpm at the rate of about 50 rpm/ min by slow
opening of the MSV bypass regulating valve. Soak the set for 20 minutes at this
speed.
Raise the speed smoothly to 3000 rpm without pause. It is dangerous to run the set
near the critical speeds and hence it is prohibited to hold the set in the critical speed
zone
When turbine main oil pump develops pressure of 18 k/cm2 before NRV at about
2800 rpm, slowly close the discharge valve of Starting Oil Pump (SOP). See that the
oil pressure in the governing system remains constant. Stop SOP and again open the
discharge valve for operation during stopping of turbine

23. While raising the speed, control the temperature of oil entering the bearings.
Maintain oil cooler outlet temp. around 45 0
During speeding up of the turbine increase the boiler firing rate so that the steam
parameters before synchronization are as follows :
M.S. steam pressure : 25-30 k/cm2.
M.S. Temperature : 300 – 330 0C.
R.H Temperature : 300 – 330 0C.
Synchronize the machine and load the machine at 10-20 MW
After soaking the turbine for about 20 minutes at a load of 20 MW, close all the drain
valves of steam lines, steam admission pipes, HR drain collector and IP drain collector
During heating of turbine under load, constantly monitor the differential expansion
of HPT, IPT and LPT and the overall expansion of HPT & IPT

24. LOAD LIMIT PILOT
VALVE
FOLLOW PILOT
VALVE
SUMMATION PILOT
VALVE
DIFFEREN
TIATOR
INTERMID
IATE PILOT
VALVE
EHT
FEED
BACK
PILOT
VALVE
SERVO
MOTOR
PILOT
VALVE
CONTROL
VALVE
SERVO
MOTOR
EGPV
ESV
IV
ISPUG
Control oil 20 atg
Primary sensitive oil 7.7 atg
Secondary senst. Oil 10.3 atg
Miscellaneous oil
Speeder Gear
Load limitor
210 MW LMZ GOVERNING SYSTEM BLOCK DIAGRAM
MOP
Protection oil
TTS

26. Turbine Cold Start up producer 210 MW LMZ
Cooling water system:-
 બન્ને condenser ready હોવા જોઇએ. Line vent/ water box vent Open હોવા જોઇએ.
 બન્ને condenser ના Inlet/Outlet valve open રાખવા
 Water box ના Drain Open રાખવા પાણી full આવ્યા બાદ drain બંધ કરવા.
 Interconnecting valve ખોલી Intake tunnel charge કરવી
 Proper venting થયા બાદ એક C.W pump ready કરી ચાલુ કરવો
 CW system charge હોવાથી ACW Booster pump system ready કરી એક ACW
booster pump ચાલુ કરવો, જો ACW system લેવી હોય તો પહેલા Tank level Normal
કયાા બાદ system ready કરી એક pump ચાલુ કરવો
BCW system Tank level Normal કયાા બાદ system ready કરી એક pump ચાલુ કરવો

27. Seal Oil System:-
1. MOT level normal હોવું જોઈએ અને oil purifier service માં હોવું જોઈએ
2. Turbine floor filter પહેલા ના isolating valve બંધ, Damper tank ના valve બંધ રાખવા
3. Seal oil system panel પર Auto/manual switch “Manual mode” પર રાખવી
4. D.C seal oil pump નો supply “ Off ” રાખવો
5. A.C seal oil pump suction valve open, R/C valve open તથા discharge valve closed રાખવા
6. A.C seal oil pump નો supply ready કરી pump ચાલુ AMP 20 થી ૨૨ જેટલા રાખવા તથા pressure
12.0 થી 14.0 kg/cm² રાખવું જો AMP વધારે હોય તો R/C valve ઓછો કરવો
7. Seal oil filter oil charge કરી Damper tank level Normal લઈ લેવું
8. સૌ પ્રથમ OPR દ્વારા thrust oil pressure 1.0 to 1.5 kg/cm² આપી return oil flow ચેક કરી લો
9. ત્યાર બાદ DPR ના bypass valve દ્વારા 0.6 to 0.9 kg/cm² આપી return oil flow ચેક કરી લો.
10.H2 seal oil tank માં ઓઇલ level maintain કરવા drain ખોલી 01 pot જેટલું maintain રાખવું
11. Seal oil system normal હોય તો TMD/EMD ની સ ૂચના મુજબ Air pressure 01 kg/cm² જેટલું રાખી
Damper tank/DPR/OPR “ Auto mode” પર મુકી float valve service માં મૂકવો
12.TMD ની સ ૂચના મુજબ air leak test માટે air pressure 3.5 kg/cm² જેટલું લઈ લેવું (24 hrs.)
13.D.C seal oil pump નો supply “ ON ”
14.Seal oil system panel પર Auto/manual switch “Auto mode” પર મૂકવી.

28. LUB Oil System:-
 MOT level normal હોવું જોઈએ અને oil purifier service માં હોવું જોઈએ
 Turbine box-up condition માં અને TMD ના clearness મુજબ system service માં
લેવી
 Lub oil cooler ના oil side ના Inlet/Outlet valve open કરવા
 D.C Lub oil pump નો supply “ Off ” રાખવો
 A.C Lub oil pump suction valve open, તથા discharge valve closed રાખવો
 A.C Lub oil pump નો supply ready કરી pump ચાલુ કરી ધીમેધીમે discharge valve
open કરવો
 Turbine ની બધી bearing માં return oil flow ચેક કરી D.C Lub oil pump નો supply “
ON ” કરવો
 Jacking oil pump supply ready કરી pump ચાલુ કરવો
 Barring gear નો supply ready કયાા બાદ engage કરી ચાલુ કરવું
 Lub oil system normal થયા બાદ SOP ચાલુ કરવો

29. Condensate system:-
1. CST level normal હોવું જોઈએ, Hot well pump ready and available
2. Hot well level normal maintain કરવું
3. GC-I, GC-II, ejector, LP heaters ના vent open કરવા
4. C.E pump suction valve open, Discharge valve closed હોવા જોઈએ
5. Mc-21 closed અને R/C open તથા MC-49/50 open રાખી C.E pump ચાલુ કરવો
6. Proper venting થયા પછી LP heaters venting કરી Deareator level normal કરવું
Auxiliaries PRDS Adjacent unit inter connecting valve ખોલી steam charge કરવું
Feed water system ready કરી બધા BFP ના supply ready કરવા
Boiler Lit-up કરતા પહેલા ચેક કરી લો
Boiler MSV અને equalizing valve બંધ હોવા જોઈએ
Cold fill pump ચાલુ કરી Boiler Drum level normal maintain કરવું (-50 to -100)
Drum, super heater અને Re-heater ના vent open હોવા જોઈએ (Eco ના vent બંધ)
Super heater Drain 1, 4, 8 અને master drain open હોવા જોઈએ
Water wall ના બધા drain બંધ હોવા જોઈએ
Bottom ash hopper sealing અને Filling કરેલું હોવું જોઈએ
Burner Tilting “0” position પર હોવું જોઈએ

30. બન્ને APH ના Flue gas અને Air pass ready હોવા જોઈએ તથા બન્ને APH ના GB અને SB ના LO pump
ચાલુ હોવા જોઈએ અને બન્ને APH Electric drive motor પર ચાલુ હોવા જોઈએ
Start-up vent open હોવા જોઈએ તથા Eco R/C valve open હોવા જોઈએ
Spray Zone totally isolated condition માં હોવા જોઈએ
LDO/FO pump/scanner air fan/Igniter air fan ચાલુ હોવા જોઈએ
ID Fan System:-
Instrument Air Pressure 06 kg/cm² જેટલું maintain રાખવું
IGV minimum, suction damper open, Discharge damper closed અને Electric supply ready હોવા જોઈએ
હવે ID Fan ચાલુ કરો. Discharge damper full open confirm કરી લો ત્યારબાદ IGV ધીમે ધીમે open કરી
draught -5 mmwcl જેટલો maintain રાખવો.
FD Fan System:-
L.O pump ચાલુ હોવા જોઈએ
IGV minimum, suction damper open, Discharge damper closed અને Electric supply ready હોવા જોઈએ
હવે FD Fan ચાલુ કરો. Discharge damper full open confirm કરી લો ત્યારબાદ IGV ધીમે ધીમે open કરી
total airflow 250 to 280 mmwcl જેટલો maintain રાખવો. અને furnace DP 15 to 20 mmwc જેટલું રાખવું

31. Purging માટે:-
બધા જ Trip valve બંધ હોવા જોઈએ
Airflow > 30% (280 mmwc)
FO/LDO gun ના Hydro motor valve બંધ હોવા જોઈએ
બધી Mills OFF અને Feeders OFF હોવા જોઈએ તથા બધા HAG બંધ હોવા જોઈએ
કોઈપણ BOILER TRIP command ન હોવો જોઈએ (MFT સસવાય )
NO flame scanner બધા OFF હોવા જોઈએ
Start Purging command (6 mins) Purging completed (MFT Reset)
બધા જ Trip valve open કરી Igniter નો command આપવો ત્રણ Igniter આવ્યા બાદ LDO/FO નું selection
LDO પર આપવું ત્યારબાદ AB Tire LDO gun નો command આપી ત્રણ gun Service માં રાખવી
Flue gas temp 180 °C થી વધારે થયા બાદ CD tire માં FO gun ready કરી command આપવો.
હવે CD tire માં ત્રણ FO ની Service માં રાખી AB tire માં LDO gun cutoff કરવી
હવે LDO/FO નું selection FO પર આપવું ત્યારબાદ AB Tire માં બે FO gun service માં રાખવી
હવે CD tire માં ત્રણ FO dummy કરવી. Drum pressure 2.0 kg/cm² થયા બાદ vent બંધ કરવા
Drum level વધશે જેથી CBD/EBD દ્વારા maintain કરવું

32. Turbine start-up procedure
CW pump બીજો ચાલુ કરવો. Deareator steam line charge કરવી. PCV-17 ના Isolating valve 02 turn
જેટલા OPEN કરવા, PCV-14 ના Isolating valve 50% જેટલા OPEN કરવા.
Steam ejector line અને Gland sealing line charge કરવી
Drum pressure 5.0 kg/cm² થયા બાદ Super heater Drain 1, 4, 8 ના master drain 1T open રાખવો
Starting Ejector service માં લઈ vacuum puling Start કરવું જ્યારે vacuum 150 mm of hg થયા બાદ Gland
sealing valve open કરી GC-1 Ejector charge કરવું. ત્યારબાદ GS pressure 0.10 kg/cm² રાખવું
AS-40 IPT seal chamber OPEN કરવો
હવે M.S line charge કરતા પહેલા ચેક કરી લો.( TR-3,TR-10 READING)
TMSV તેના Bypass valve, ESV/IV, HP/LP Bypass valve, ES-20/21, CA-21/22 બંધ હોવા જોઈએ
M.S line atmosphere drain, In between drain અને HP/LP upstream line drain OPEN હોવા જોઈએ
Drum pressure 8.0 kg/cm² થયા બાદ BMSV ના Bypass ખોલી M.S pipe metal temperature 100 °C થયા
પછી BMSV ધીમે ધીમે Full OPEN કરવા. M.S pressure 10 kg/cm² Temp 200°C
M.S Pressure 20 kg/cm² Temperature 250 °C
હવે એક BFP ચાલુ કરો Boiler blow down 10-10 mints આપવું Drum level maintain કરવું
Turbine side બધા જ Drain full open કરવા અને જે main steam side atmospheric drain છે તેને Flash
tank માં divert કરી લેવા
હવે condenser vacuum વધારો ૩૦૦ થી 350 mm of hg

33. HP/IP Bypass system charge કરતા પહેલા:-
HP pump ચાલુ હોવો જોઈએ અથવા pump નું pressure adequate હોવું જોઇએ
Starting oil pump start કરી Lub oil temperature maintain 42°C
CRH/HRH line drain, HP bypass down steam drain અને LP bypass up/down steam drain OPEN
પહેલા LP Bypass valve 20 % ખોલવો ત્યારબાદ HP Bypass 5% open કરી line haunting ન આવવું
જોઇએ એ પ્રમાણે valve ધીમે ધીમે વધારે open કરી pressure અને temperature maintain રાખવું
M.S Pressure 25 kg/cm² Temperature 280 to 300 °C
HRH Pressure 02 kg/cm² Temperature 280 °C
હવે HRH pipe metal temperature નોંધી લો. HRH Pressure 05 kg/cm² જેટલું maintain કરવું
HP Turbine Back Heating:- (TR-27,TR,22,)
HP exhaust temperature, Differential Expansions નોંધી લો.
જો M.S pressure વધે તો AB tire માં એક FO gun dummy કરવી
HP casing drain Full open, CA-21/22 Closed, After CRH NRV’s drain Closed.
CRH NRV’s bypass valve ES-20/21 open કરી HP casing temp> 150°C અને HPOE> 07 mm
HPT exhaust temperature maintain up to 200°C અને HPT differentials 1.0 to 2.0 mm વધશે
LP exhaust temperature વધે તો MC-49/50 નો spray ચાલુ હોવા જોઈએ

34. Loop Heating:- (TR-11)
Open ESV/IV loop drains સાથે DW-13/14, IP casing drain, IV manually locked
કરવા
હવે HRH pressure reduce કરો 1.0 kg/cm² જેટલું ત્યારબાદ speeder Gear દ્વારા
ESV/IV 20% ખોલવો
IV manually lock હોવાથી unlock કરી 20 % open કરવા
Turbine MSV bypass valve open કરી Turbine Inlet pressure 05 to 10 kg/cm² જેટલું
રાખવું
HPT loop temperature >150°C અને IPT loop temperature > 100°C
IPT casing temperature increased trend અને HPT exhaust temperature down થયા
હોય તો LP bypass throttle કરી HRH pressure થોડું વધારવું
HRH pressure વધવા થી Barring gear disengage થઈ જશે.
HPT/IPT casing Top-bottom differential <50 °C
Both ESV metal temperature raising trend and Left/Right differential < 30°C
HPT Top/Bottom differential વધતો હોય તો HP casing drain throttle કરવા.

35. • Rolling પહેલા ચેક કરી લો:-
• હવે condenser vacuum વધારો 5૦૦ થી 550 mm of hg
• Closed TMSV bypass valve, Closed CRH NRV’s bypass valve ES-20/21, Closed HP
bypass valve
• HRH pressure “0” થયા પછી LP bypass બંધ કરી CA-21/22 valve Open કરી બંધ
કરવા
• જો M.S pressure વધે તો 1.4.8 master drain open કરવો અથવા FO gun dummy
કરવી
• હવે speeder gear દ્વારા ESV/IV અને Control valve FULL open કરવા
• Turbine MSV bypass valve ખોલી Turbine speed 500 RPM (socking 10 mints)
• AS-39 valve OPEN કરવો Lub oil temperature maintain 42°C
• ત્યારબાદ Raise Turbine speed 1000 RPM ( 50 rpm/min ) 700 RPM generator ની
critical speed છે
• 1000 RPM socking 30 to 45 mints રાખવું HPT exhaust temp down આવવા થી
HPT differential - ve તરફ down આવશે હવે condenser vacuum વધારો 6૦૦ થી
650 mm of hg Full લઈ લો

36. 3000 RPM speed લેતા પહેલા:-
Drum level -50 to -100 જેટલું રાખવું
ID/FD Fan બીજી pair લઈ લેવી, ત્યારબાદ PA fan ચાલુ કરી Base mill A ready કરવી heating માં રાખવી
AB Tire માં ચાર FO gun service માં રાખવી M.S pressure 25 kg/cm² Temp 300 to 330 °C
ત્યારબાદ Raise Turbine speed 3000 RPM (Speeder gear વધારી up to 27 mm જેટલું )
Turbine speed 2600 RPM થયા બાદ TMSV Open કરવા (3000 RPM socking 10 mints)
A. When Turbine(3000 RPM) slowly close the discharge valve of Starting Oil Pump (SOP). See that the
oil pressure in the governing system remains constant. Stop SOP and again open the discharge valve
for operation during stopping of turbine
Synchronise કરતા પહેલા:-
Field Breaker “ON “કરવું Excitation “ON” કરવું, DC supply switch “ON” કરવી
Incoming / Running voltage સરખા match કરવા ત્યારબાદ synchro-scope “ON” કરી speeder gear દ્વારા speed
maintain કરી machine Grid જોડે Synchronise કરો અને machine Load at 15 MW
The steam parameters
MS pressure : 30 kg/cm²
MS temperature : 330 °C
HR temperature : 300 °C
During heating of turbine under load, constantly monitor the differential expansion of HPT, IPT and LPT and
the overall expansion of HPT & IPT.
Turbine side ના બધા જ drain બંધ કરવા, LPH ના extraction આપી દેવા,

37. HPC
metal
temp
MS
pressu
re
-ve
misma
tch
Extrac
t
match
+ ve
match
100 20 - 280 280
30 280 280
200 20 280 280 280
30 280 280 280
250 20 280 310 360
30 280 330 370
50 300 340 380
70 325 360 400
275 20 300 340 380
30 310 350 390
50 335 370 400
70 350 385 420
300 20 320 360 405
30 330 370 415
50 350 385 430
70 365 400 440
Temperature matching for turbine rolling (M.S Temp)