steam turbine3

8/11/2019 steam turbine3

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LESSON

3LECTURE

MAJOR TURBINE OVERHAULINGPROCEDURE

SUB - OBJECTIVE

At the end of the lesson the T!"nee #"ll $e !$le to de%onst!te !n &ndest!nd theM!'o O(eh!&l"n) Po*ed&e+

,+ PRE-CONDITIONS .ACTION B/ OPERATION SECTION0

The following tests are to be carried out by Operation Section and the results to besent to MMS.

Check and record vibration and temperatures of all bearings.

Carry out over speed oil trip test for turbine.

Carry out lub. Oil trip test.

Carry out thrust bearing wear test.

Carry out throttle valve stem freedom test.

Check the function of extraction non return valves trip in sequence of turbine trip.

erform characteristic test of hydraulic controller of throttle valves.

erform characteristics test of hydraulic controller of governing valves.

Carry out simulation test of extraction non return valves with de!aerator and highpressure heaters at high level.

Carry out extraction non return valves leak test by opening drain line after nonreturn valves with de!aerator actual high level.

Carry out air leak test of generator.

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /


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INSTRUMENT DISCONNECTION

"rrange with *MS to disconnect and remove the field instruments on the turbine andgenerator as listed below and when required.

/. Thermocouples0. overnor and Throttle $alves limit switches.-. 1ront gauge panel.2. land steam temperature controller.3. "ll vibration pick ups.4. Speed pick ups.5. Turbine rotor position pickup.6. #ifferential expansion pickup.7. &ccentricity pick up./8. Thermocouples and (T#s of turbine and generator bearings.//. Turning ear +imit Switches.

ELECTRICAL DISCONNECTION

"rrange with &MS to disconnect the electrical connections as and when required.

/. Turning gear motor connection0. &xciter brushes.-. (otor grounding device.

DISASSEMBL/

(emove the cladding.

(equest the scaffolding Section to erect the scaffolding as per requirement.

(emove the sheet metal lagging and their thermal insulation from the turbine

casing9 valve bodies and steam piping as required.

#isconnect and remove the throttle valves and servo motors.

#isconnect and remove the governor valves and servo motors.

THROTTLE VALVES

/. :ith reference to the diagrams 1ig. -!/9 -!09 -!- ; -!29 disassemble thethrottle valve.

0. Clean and inspect all the parts paying special attention to sticking on thestem9 excessive clearance of bushings9 wear of plugs and scored seats.

-. Check clearance between stem9 bushings9 inner and outer valve plug.2. "rrange with *M# to overhaul and ad


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1")+ 3-,+ Thottle V!l(e+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& -


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1")+ 3-2+ Thottle V!l(e+

M&C)"%*C"+ M"*%T&%"%C& "#$"%C CO'(S&+&SSO% - "& 2 ST&"M T'(,*%& O$&()"'+


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1")+ 3-3+ Thottle V!l(e+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& 3


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1")+ 3-+ Thottle V!l(e+



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THROTTLE PARTS LIST+

/. Operation lever connecting link pin0. Operation lever connecting link =in pairs>-. ,olt2. Spherical washer =male and female>3. Connecting link4. ,ushing5. in6. %ut7. Spacer /8. Stud//. Connecting bushing/0. Connecting pin/-. 1ulcrum link/2. Spring seat =upper>/3. 1ulcrum pin/4. 1ulcrum bushing/5. Servo motor support and spring housing/6. Compression spring =inner>/7. Compression spring08. Compression spring =outer>0/. Spring seat =lower>00. Spring guide0-. &xtension nut02. Spherical washers =male and female>03. &xtension nut04. Spherical washers =male and female>05. $alve bonnet06. Stud07. Stud-8. in

-/. $alve stem bushing-0. $alve stem bushing--. Spring seat guide-2. $alve stem-3. uide bushing-4. $alve =main>-5. $alve bushing-6. $alve ring-7. Compression spring28. Spring seat shims2/. Spring seat20. $alve stem end

2-. ilot valve22. ilot valve nut23. $alve seat24. (etaining screw25. asket26. (etaining Screw27. ,ushing38. in3/. Spacer30. +ink



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3-. Spherical bearing32. %ut33. :asher special ,olt special34. Switch box35. Switch support bracket36. in37. %ut



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GOVERNING VALVES

/. :ith reference to the diagram -!39 -!4 ; -!59 disassemble the governingvalves.

0. (emove all deposits from stem and plug.-. erform contact check of the seat and disc.2. Check the pilot valve freeness.3. "rrange for #ye enetrant Test of the disc and seats.4. (epair or replace any parts if necessary.5. (eassemble the governing valves.

1")+ 3-4+ Go(en"n) V!l(e+



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1")+ 3-5+ Go(en"n) V!l(e

M&C)"%*C"+ M"*%T&%"%C& "#$"%C CO'(S&+&SSO% - "& /8 ST&"M T'(,*%& O$&()"'+


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GOVERNING VALVE 6 PARTS LIST

/. $alve0. in-. $alve nut2. Stop Screw3. Socket head screw4. %ut5. Spring seat6. Support7. %ut/8. Servo motor link//. Servo motor link pin/0. Spring/-. Spring support/2. Spring support pin/3. Operating lever /4. (etainer/5. +ock nut/6. Operating lever stop bar/7. Support rod08. %ut0/. (etaining screw00. Connecting link pin =upper>0-. Operating lever connecting link02. Connecting link pin =lower>03. Support bracket04. Set screw05. $alve stem bushing06. :asher =female>07. :asher =male>%ut-8. %ut

-/. Stud-0. $alve stem--. +oad spring support-2. $alve bonnet-3. uide bushing-4. in-5. in-6. Cross head pin-7. Cross head28. +oading spring2/. +oading spring20. %ut

2-. Stud22. +oading spring seat =lower>23. +oading spring seat =upper>24. "d


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1")+ 3-7+ Coss-se*t"on t&$"ne thottle !n )o(eno (!l(es+ Al-8ho$! Pl!nt+



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1")+ 3-7!."0+ Le(e O9e!ted B!-L"ft V!l(e Ge!+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /-


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1")+ 3-7!.""0+ D"e*t o9e!ted B! L"ft V!l(e Ge!+



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1")+ 3-7$."0+ T:9"*!l C!% O9e!ted Contol V!l(e .A;"!l Se*t"on0

1")+3-7$.""0+ T:9"*!l M<"9le Contol V!l(e A!n)e%ent+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /3


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(emove bearing %o. 0 pedestal cover after disconnecting in!board and out boardseals.

(emove the coupling guard.

Measure and record the coupling run out readings and record in the alignmentcheck value sheet.

Measure and record the coupling bolt length.

:ith reference to the diagram -!6 ?(igid Coupling@9 disassemble the turbine andgenerator coupling.

/. Mark all the bolts and holes0. (emove the bolts.-. 'sing .



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1")+ 3-


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)old the rotor in ?A@ position.

:ith reference to diagram -!7 (otor ?A@ Setting &nd Mic (eading9 measure andrecord the rotor position as described belowB

/. Open the micrometer hole in the end cover by rotating the cover plate.0. *nsert he micrometer spindle.-. )old the sleeve firmly against the boss on the end cover.2. Screw the thimble inwards until it


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1")+ 3-,+ Re*od of 1"n)e P"e*e+



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:ith reference to the diagram -!// ; -!/09 remove the upper half casing of themain oil pump.

1")+ 3-,,+ M!"n O"l P&%9 !nd Go(eno I%9elle+



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1")+ 3-,2+ M!"n o"l P&%9 !nd Go(eno I%9elle+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& 0/


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Measure and record the seal ring clearance of the main oil pump.

Measure and record the governor impeller sleeve clearance.

(emove the upper halves of outer glands on generator and governor ends.

'nbolt9 ack the uppercasing up to bolt dowel height and then remove the uppercasing of the turbine.

NOTE@

D&"n) &n$olt"n) "f !n: $olt "s st&* do not t: to o9en "t #"th e;*ess fo*e+M!e $o"n) on the n&t #"th o&t d!%!)"n) the the!d of the $olt !nd thene%o(e the $olt+

,lank off all openings and connections to the turbine casing and pedestals.

JOURNAL BEARINGS No+ , !nd 2+

Check the %ip and ,earing Clearance before removing the bearing cover.

Check and record the radial clearance on %o. / and %o. 0 bearings.

(emove the upper halves of %o. / and %o. 0


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1")+ 3-,3+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& 0-


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1")+ 3-,+ T:9"*!l s9he"*!ll:-se!ted t&$"ne $e!"n)+



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1")+ 3-,4+ Jo&n!l Be!"n)+



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1")+ 3-,4.!0."0+ T:9"*!l Jo&n!l $e!"n) &sed "n H")h-Pess&e T&$"ne+

1")+ 3-,4.!0.""0+ Be!"n) P"n*h A*t"on+

1")+ 3-,4.!0."""0+ Be!"n) L"ne !nd Se!t+



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1")+ 3-,4.$0."0+ T"lt"n) P!d Be!"n) S*he%!t"*+

1")+ 3-,4.$0.""0+ Blo* !nd P!d Asse%$l:+

1")+ 3-,4.$0."""0+ T"lt"n) P!d Be!"n)+

1")+ 3-,4.$0."(0+ Be!"n) D"!%ete !nd P"n*h+



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THRUST BEARING

1loat the rotor to the governor and generator end positions9 measure and record thethrust float clearance.

:hile disassembling the thrust bearing with reference to the diagrams 1ig. -!/4 D -!/79 observe the position markings.

(emove the upper half of the thrust bearing and main oil pump.

Check and record the thrust bearing and MO oil seal clearances.

(emove thrust pads and cages.



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CLEANING INSPECTION AND MAINTENANCE

Clean and inspect all the parts.

*nspect the babbitt surface of the pads.

Check wear of the shoe pivot. &nsure flatness to be not more than 3 mm.

Check leveling plates condition.

olish the thrust collar if required.

Check run!out of collar.

"rrange for a compulsory die penetration check of the babbitt linings bonding..

"rrange for the inspection of the thermocouples by *MS.



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1")+ 3-,5+

M&C)"%*C"+ M"*%T&%"%C& "#$"%C CO'(S&+&SSO% - "& -8 ST&"M T'(,*%& O$&()"'+


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1")+ 3-,5.!0."0+ T"lt"n) P!d Th&st Be!"n) .P!t"!l V"e#0

1")+ 3-,5.!0.""0+ Th&st Be!"n) Const&*t"on+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& -/


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1")+ 3-,5.$0."0+ Do&$le R&nne th&st Be!"n) S"n)le R&nne th&st Be!"n)T!9eed L!nd Th&st Be!"n)+



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1")+ 3-,5.*0."0+ T!9eed L!nd Th&st Be!"n) Det!"l1&nd!%ent!ls Th&stBe!"n)+ Se*t"on of ! t"lt"n) P!d Be!"n) T:9"*!l T"lt"n) P!d Const&*t"on

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& --


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1")+ 3-,7+ T"lt"n) P!d th&st Be!"n)+



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1")+ 3-,


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1")+ 3-,=+ M!"n T&$"ne Th&st Be!"n)+



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1")+ 3-2+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& -5


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THRUST BEARING CLEARANCE+

"ssemble the thrust bearing as per S*. :ith reference to the diagram Thrust,earing clearance 1ig. -!0/. Measure the clearances marked "9 ,9 and C. (ecordthe measured values on the thrust ,earing Clearance.

Check and record the oil seal rings axial and radial clearances.

Compare the as found value with the design value and ad


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1")+ 3-22+ Cle!!n*e Che* De("*e+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& -7


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OIL SEAL RINGS

:ith reference to the diagrams 1ig. -!0- ; -!029 disassemble the upper and lowerhalves of the seal rings at the generator end and bearings / and 0.

Clean and inspect all parts.

Check for wear of the seal ring.

(eplace the gasket.

(epair or replace any parts if required.

"d


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1")+ 3-2+ O"l Se!l R"n)+ .Be!"n)s , !nd 20+

GOVERNOR IMPELLER SEELVE

Check governor impeller sleeve clearance.

*f clearance is more than the design limit =8.83 to 8./3 mm>9 the following actionshould be taken.

(emove the stud shaft.

olish the coupling at the place of rubbing of vibration pickup if required.

(eplace or refurbish the governor impeller sleeve if necessary.

1ix back the stud shaft and align it.



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MAIN OIL PUMP

:ith reference to the diagrams 1ig. -!03 ; -!04 ?Main Oil ump and overnorimpeller ? disassemble the main oil pump.


*nspect the impeller for corrosion and excessive clearance.

Checking wearing ring clearance and replac2e if necessary.

(epair or replace any parts if required.

"ssemble the pump.

ut back pedestal covers and maintain oil defector seal clearance at in and at outboard.



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1")+ 3-24+ M!"n O"l 9&%9 !nd Go(eno I%9elle+



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1")+ 3-25+ M!"n O"l 9&%9 !nd Go(eno I%9elle+



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MAIN TURBINE GENERATOR BEARING

O11ICE NOTICE

Shot C&ts B:-P!sses J&%9es C&t o&ts et*+ !e NOT to $e *!"ed o&t#"tho&t 9"o !99o(!l fo% :o& D"("s"on M!n!)e+

Obtain T:.

%OT&B

"ttempt the enerator ,earings one after the other.

DISASSEMBL/

"rrange with *MS for removal of vibration ick!ups.

#isassemble the outside oil deflectors.

"rrange with &MS for checking of ,earing *.(. values.

(emove the bearing cover.

Check %ipE Clearance and (ecord.

:ith reference to the diagrams 1ig. -!05 ; -!06 respectively9 remove 'pper half ofthe bearing rings and the bearings.

Check the bearing clearance and record.

osition the rotor lifting device and lift the rotor by about 8.08 mm.

"rrange with *MS to remove (T#.

(oll out lower half of the bearing.

(emove lower half of the bearing and bearing ring9 making them rotating around theshaft neck.

CLEANING AND INSPECTION

:ith reference tot he diagrams clean all parts of bearings and housings.

Check for wear of the oil seal rings.

*f oil seal rings are partially damaged9 restore the sealing edges. Otherwise replacethe seal rings.

Check oil drain passages of oil seal rings for obstruction.

Check for any marks on babbitt surfaces and corrosion.

"rrange with T; * Section to check bonding of ,abbitt lining.



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*nspect the


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ASSEMBL/

NOTE@

Befoe e!sse%$l"n) ens&e *le!nl"ness of !ll 9!ts of the $e!"n) ho&s"n)s!nd o"l 9"9"n)+

1or assembling follow the reverse sequence to the disassembly procedure. :hileassembling the bearing9 apply stop oil =ST treatment> to the


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1")+ 3-27+ Be!"n) !nd H:do)en Se!l Bo; "n) s"de+



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1")+ 3-2


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T!$le 3-,+ Re*od of Ins9e*t"on .C5 Gene!to Be!"n)s+0

ROTOR .See 1")+ 3-2=0

Carry out rotor aluminum grit blasting. Shaft


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"rrange for liquid enetration *nspection9 'ltrasonic Testing and Magnetic articlesinspection of the bladings and rotor.

(eport and repair any defects found.



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1")+ 3-2=+



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1")+ 3-3+



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1")+ 3-3,+



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1")+ 3-32+



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1")+ 3-33+



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1")+ 3-33.!0."0+ T:9"*!l+Roto heel Det!"ls+

1")+ 3-33.!0.""0+ Ro&)h M!*h"n"n) Roto D&"n) M!n&f!*t&"n)+



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1")+ 3-33.$0."0+ T&$"ne Roto D&"n) M!n&f!*t&e+

1")+ 3-33.$0.""0+ 1!*e-M!*h"n"n) Sho&d B!nds on Do&$le-1lo# Roto+



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1")+ 3-33.*0 O99osed-flo# Roto Asse%$l: "n Lo#e-H!lf C!s"n)s+



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1")+ 3-33 .d0."0+ Asse%$l"n) B&*ets on R"% T&$"ne Roto "n Lo#e-H!lf shellSho#"n) B&*et heels !nd St!t"on!: P!ts+

1")+ 3-33 .d0."""0+ 1"tt"n) Sho&d B!nds O(e B&*et Tenons+



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1")+ 3-33 .e0."0+ B&*et Lo*"n) P"e*e !nd P"ns+



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1")+ 3-33 .e0.""0+ P!t"!ll: Asse%$led heel Sho#"n) Ad%"ss"on Slot+



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1")+ 3-33 .e0."""0+ heel "th $&*ets Inst!lled !nd Lo*"n) P"e*e "n Pl!*e+



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1")+ 3-33 .e0."(0+ Co%9leted heel Asse%$l: Sho#"n) Sho&d B!nds+



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BLADE RINGS

Carry out blade ring aluminum grit blasting.

*nspect the seal strips.

(epair or replace if necessary.

GLAND SEALS

:ith reference to the diagrams -!-49 -!-5 ; -!-69 disassemble the inner and outerglands of the governor and generator ends.


Check the seal rings for excessive wear.

(epair or replace any parts if necessary.



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1")+ 3-3+ T:9"*!l HP t&$"ne )l!nd+



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1")+ 3-34+ C:l"nde L!:o&t Inne C!s"n)+

/. '*#& ,+"#&

0. #(*++ )O+& 1O( O*%T "SS&M,+G ,O+T.

-. +"T)&!T'(% C*(C'M1&(&%T*"+ (OO$&.

2. 1"C& O1 MO'%T*% +' 1O( "#'STM&%T S)*MS.



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1")+ 3-35+ Inne Gl!nd .Go(eno End0



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1")+ 3-37+ Inne Gl!nd .Gene!to End0



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1")+ 3-3


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1")+ 3-3=+ B!l!n*e P"ston+



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CASINGS

Carry out oil stoning for upper and lower casing faces and blading ring seating.

Clean the casing using a petroleum base solvent..

*nspect the upper and lower casing.

Carry out dye enetrant test for upper casing.

"rrange for liquid enetration Test for Stationary blades and bolting.

"rrange for liquid enetration Test9 and Magnetic article *nspection for noHHleblock and welding.

(eport any abnormalities found and repair or replace any parts if required.

CASING BOLTS

*nspect and clean the casing bolts and dowel area.

(epair or replace any bolts if required.

TURNING GEAR .SEE 1IG+ 3- 3-, 3-20

Carry out S* for the overhaul9 Maintenance and Calibration of the turning gear"ssembly.

Carry out for the Overhaul9 Maintenance and Calibration of the Turning ear Motor.

O11ICE NOTICE

Shot C&ts B:-9!sses J&%9es *&t o&ts et*+ !e NOT to $e *!"ed o&t#"tho&t 9"o !99o(!l fo% :o& D"("s"on M!n!)e+

PREPARATION

Obtain T:.

Make sure that all relevant valves are properly close and tagged.

Make sure that engaging lever is already disengaged.



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DISMANTLING PROCEDURES

"rrange with &M# to disconnect the related electrical connections.

"rrange with *M# to disconnect the instruments and its connections.

(emove bolts holding hand wheel cover and adopter.

(emove hand wheel cover.

(emove base bolts of the unit the from housing.

,y using Crane9 Chain blocks9 slings9 shackle and eye bolts9 lift unit from its positionand place in a safer area.

Take out the engaging lever guard and remove rubber below.

osition the Crane with connections above the motor and fix slings.

(emove motor anchor bolts and pull out the motor.

"rrange with &M# to overhaul or service the motor.

Check the condition of coupling9 rubber insert and hand wheel below. (eplace ifnecessary.

+oosen align screw on the lower half and remove coupling.

(emove thrust bearing cover with packing.

Check thrust bearing and guide bearing. (eplace with new one if required.

(emove pin from the main pinion shaft.

Check gears and replace the bush if required.

ull out reduction gear. (emove spacer ring and shaft.

Take out stop ring of the worm gear. (emove worm gear and pinion shaft.

(emove retaining screw holding the slash pi6nion shaft and pull out the shaft9leaving slash pinion gear in the position.

*nspect all bushing9 shaft and contact surface for the respective gear for any

damage and excessive wear. (eplace the part as necessary.

Clean all parts thoroughly.

Check condition of fulcrum9 neumatic unit below and springs. (epair or replace asnecessary.



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LIST O1 PARTS

/. :orm ear 0. :orm gear pinion-. uide bearing assembly2. :orm3. Thrust bearing assembly4. Coupling assembly5. Turning gear place6. Turning gear housing7. Stud/8. %ut//. )and operating mechanism/0. &lectric motor /-. Socket head screw/2. ,ellows/3. Clash pinion gear /4. Clash pinion shaft/5. (eduction gear/6. Main pinion/7. &ngaging lever 08. Shift lever handle0/. %ame plate00. Cover support0-. Spring02. +ever cover 03. Trigger pin04. Trigger 05. ,ushing06. Spacer ring07. Aey-8. Snap ring

-/. Spacer ring-0. ,ushing--. (etaining screw-2. ,ushing-3. Spacer ring-4. ,ushing-5. Spacer ring-6. late assembly-7. ,ushing28. ,ushing2/. ,ushing20. Aey

2-. Stop ring22. Spacer ring23. Spacer ring24. neumatic cylinder25. +imit switch25a +imit Switch25b +imit switch26 in27 Clevis38 Tubing support3/ Tubing assembly



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1")+ 3-+ M!"n T&$"ne T&n"n) Ge!+



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1")+ 3-,+ M!"n T&$"ne T&n"n) Ge!



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1")+ 3-2+ M!"n T&$"ne T&n"n) Ge!



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RIGID COUPLING .SEE 1IG+ 3-30

Clean and inspect the coupling faces.

Scrap off any bruises or burrs. #o not file the coupling surfaces.

Clean and inspect all bolt holes and spot facings.

1")+ 3-3+ R")"d Co&9l"n)+



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Go(eno T!nsfo%e o S9eed Ch!n)e

Carry out S* for the Overhaul9 Maintenance and calibration of the overnorTransformer or Speed Changer.

Lo!d L"%"t V!l(e

Carry out S* for the Overhaul9 Maintenance and Calibration of the +oad +imit $alve.

&xhaust ressure (egulator

Carry out S* for the Overhaul9 Maintenance and Calibration of the &xhaustressure (egulator.

Multiple Orifice and Check valve

Carry out S* for the Overhaul9 Maintenance and Calibration of the Multiple Orificeand Check $alve.

Orifice and Oil (elief $alve

Carry out S* for the Overhaul9 Maintenance and Calibration of Orifice and the Oil(elief $alve

Throttle $alve Controller

Carry out S* for the Overhaul9 Maintenance and Calibration of the Throttle $alveController.

overning $alves

Carry out S* for the Overhaul9 Maintenance and Calibration of the overning

$alves.

Over Speed Trip Mechanism

Carry out S* for the Overhaul9 Maintenance and Calibration of the Over Speed TripMechanism.

&xtraction %on (eturn $alves9 Servo motors9 oil Operated "ir ilot $alves.

Main oil Tank9 "uxiliary Oil ump9 turning ear Oil ump9 &mergency Oil ump9 OilCoolers and Oil purifier9 Oil 1ilters =) ; +>.

Carry out the followingB

OIL COOLERS

"rrange to carry out S* of the main tube oil coolers I minor overhaul9 inspectionand maintenance.



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1ILTERS

"rrange to carry out S* Main Turbine Oil tank for cleaning of all oil filters.

NOTE@

1o !ll the !$o(e *o%9onents these #"ll $e *o(eed on the >*ontol o"ls:ste%? %od&le+

Turn the upper casing up side down.

(emove upper half blade rings after


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'sing the special lifting beam and slings install the rotor.

:ith reference to the diagram below and using a 1eeler auge9 Measure andrecord the value of ?A@ on the (otor ?A@ Clearance (ecord.

1")+ 3-+ Roto >8? Sett"n)+



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NOLE BLOC8 SETTING .1IG+ 3-40

:ith reference to the diagram below and using a 1eeler auge9 Measure andrecord the value of ?'@ on the %oHHle block Setting ) impulse ,lading Clearance(ecord.

:ith the rotor set in the ?A@ position9 install the rotor position pick up coil9 thrustbearing trip device and differential expansion pick up.

1or reference during Minor Overhaul9 with reference to diagram ?(ecord of 1ingeriece@ measure and record the finger gap to rotor which is mounted on J / pedestaland also distance between coupling to casing at J 0 pedestal



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1")+ 3-4+ HP I%9&lse Bl!d"n)+



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RADIAL CLEARANCE SO1 ROTOR AND CASING SEAL STRIPS .1IG+ 3-50

:ith reference to the diagram below9 measure the clearances marked ?"@9 ?,@9 ?C@and ?#@ by +ead :ire *mpression method. (ecord the measured values on the(otor ; Casing Seal strips (adial Clearance (ecord.



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1")+ 3-7+



86/133

1")+ 3-


87/133

A;"!l Cle!!n*es fo C:l"nde Bl!des .3-=0

1")+ 3-=+



88/133



89/133

1")+ 3-4+ A;"!l 1lo#+



90/133

1")+ 3-4,+



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LIST O1 PARTS .1IG+ 3-4 0

/. Turbine (otor 0. (otating ,lade-. (otating ,lade Shroud Strip2. ,lade (ing3. Stationary ,lade +ocking iece4. Seal Strip5. Stationary ,lade6. Stationary ,lade Shroud Strip7. (otating ,lade Caulking Segment

LIST O1 PARTS .1IG+3-4,+0

/. Turbine (otor 0. (otating ,lade-. (otating ,lade Shroud Strip2. ,lade (ing3. Stationary ,lade +ocking iece4. Seal Strip5. Stationary ,lade6. (otating ,lade (etaining in.



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1")+ 3-42+ Be!"n) No+ ,+ Cle!!n*e+



93/133

No+ , Pedest!l Se!l Cle!!n*e .1")+ 3-420

:ith reference to the diagram below9 measure the clearances marked ?"@ and ?,@.(ecord the measured values on the %o./ edestal Seal Clearances (ecord.



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1")+ 3-43+ Be!"n) No+ 2+ Cle!!n*e+



95/133

NO+ 2 BEARING OIL DE1LECTOR SEAL CLEARANCE .1IG+ 3-430

:ith reference tot he diagram below9 measure the clearances marked ?"@ and ?,@.(ecord the measured values on the %o.0 ,earing Oil #eflector Seal Clearances(ecord.



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1")+ 3-4+ No+2+ Pedest!l Se!l Cle!!n*e .Co&9l"n) G&!d0+



97/133

1")+ 3-44+ Th&st Be!"n) Cle!!n*e+



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MOVEMENT O1 TURBIEN .COLD END TRAVEL0

Set the rotor to ?A@ position

Move the rotor to the limit of the governor end.

Measure and record the movement.

The design value is -.- mm

"d


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H+P+ BALANCE PISTON RING CLEARANCE .1IG+ 3-450

1")+ 3-45+ H+P+ B!l!n*e P"ston R"n)+



100/133

H+P+ IMPULSE BLADE RING .1IG+ 3-470

1")+ 3-47+ H+P+ I%9&lse Bl!de R"n)+



101/133


102/133

ROTOR CLEARANCE AFIAL L+P+ GLAND CASE TO EFHAUST HOOT.1IG+ 3-4=0

1")+ 3-4=+ Roto Cle!!n*e 6 A;"!l L+P+ Gl!nd C!se to E;h!&st Hood+



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MAIN OIL PUMP GOVERNOR IMPELLER AND OIL SEAL CLEARANCES.1")+ 3-50

1")+ 3-5+ M!"n o"l 9&%9 )o(eno "%9elle !nd o"l se!l *le!!n*es+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /8-


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H+P+ BALANCE PISTON SEAL RINGS CLERANCE .1IG+ 3-5,0

:ith reference to the diagram below9 measure the clearances marked "9, and C.(ecord the measured values on the ,alancing iston (ing9 Seal (ing Clearances(ecord.

1")+ 3-5,+ H+P+ B!l!n*e P"ston Se!l R"n)s Cle!!n*e+



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H+P+ AND L+P+ GLAND CLEARANCE

:ith reference to the diagram below9 measure the clearances marked "9 , and C.(ecord the measured values on the + and ) land Clearance (ecord.

1")+ 3-52+ LP HP Gl!nd Cle!!n*e+



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CASING LEVELING BE1ORE AND A1TER SHIMMING THE ANCHOR BOLTS1")+ 3-53+

:ith reference to the diagram below9 level the lower casing to ad


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"ssemble the thrust bearing and Main Oil ump as final.

(eassemble upper casing of the main oil pump and governor pedestal cover.

*nstall upper half of the gland seals and upper blade rings.

"ssemble the upper casing with sealing compound.

Check for Hero touch of upper and lower casings.

Bolt 9os"t"ons !nd *!s"n) $olts t")hten"n)

Bolt Pos"t"ons

,olt ositions and bolt dimensions are shown on 1igs. 6!-459 -!46 ; -!47.



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1")+ 3-5+ C:l"nde L!:o&t O&te C!s"n)+



109/133

1")+ 3-5.!0."0+ T:9"*!l Inte-st!)e D"!9h!)%+



110/133

1")+ 3-5.!0.""0+ T&$"ne Shell Sho#"n) Se(e!l D"!9h!)% H!l(es "n Pl!*e+

M&C)"%*C"+ M"*%T&%"%C& "#$"%C CO'(S&+&SSO% - "& //8 ST&"M T'(,*%& O$&()"'+


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1")+ 3-5.$0."0+ Coss-Se*t"on of T:9"*!l Inte-st!)e P!*"n) A!n)e%ent+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& ///


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1")+ 3-5.$0.""0+ T:9"*!l P!*"n) C!s"n) Det!"ls .U99e H!lf Re%o(ed0+



113/133

1")+ 3-5.*0."0+ Close U9 ("e# of Inst!lled P!*"n)s R"n)s+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& //-


114/133

1")+ 3-5.*0.""0+ T:9"*!l Se)%ented Sh!ft P!*"n)+



115/133

1")+ 3-54+ Bolt D"%ens"ons+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& //3


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1")+ 3-55+ Bolts Pos"t"on D!#"n)+



117/133

1")+ 3-57.!0.I230Thottle V!l(e Bonnet Bolt Pos"t"on 2+



118/133

CASING BOLT TIGHTENING



119/133



120/133

1")+ 3-5


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Bolts U9 To < %% D"!%ete

Tighten with torque wrench to the required torque as indicated in the table below.

TORUE TABLE

THREAD DIAMETER.MM0

PITCH.MM0

TORUE.8)%0

/2 0.8 4.0

/4 0.8 /0.208 0.3 08.5

00 0.3 --.2

05 -.8 38.6-8 -.3 5-.5

-- -.3 /8-.4-4 -.8 /2/.8

-7 -.8 /44.820 -.8 006.8

23 -.8 -/8.826 -.8 2/2.8

"fter tightening9 measure the elongation of the bolt.

The required elongation is ?8.88/3 x 1ree +ength@

:ith references to the diagram on page 249 determine the free length =1+> for theprincipal bolting member types.

Check that the measured elongation is with in KL! /8 of the required value andad


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1")+ 3-5=+ Bolts &9 to 42 %% D"!%ete !nd A$o(e+



123/133

1")+ 3-7+ N&t o S*e# T&n Ch!t+

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /0-


124/133

1")+ 3-7.!0+ Bolt He!te T!$le+

BOLT HEATER BOLT POSITION

DIS+ A,44=33 2RSOA ,3,2

RSOB ,,,2,=RSOC , and tighten them again to get the requiredelongation.

(ecord the lengths and elongation values9 in the coupling bolt tightening recordsheet furnished 1ig. -!52.

Take the turbo enerator Couplings run out at each bolt position after finaltightening of the coupling.



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ASSEMBL/ PROCEDURES 1OR TURNING GEAR

"ssemble all parts in the reverse order of dismantling.

"pply silicon liquid sealant to the housing

Carryout oil flushing S* till the oil samples are in satisfactory status.

Tuning and ad


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SIMULATION TEST O1 THROTTLE VALVE

1")+ 3-74++ SIMULATION TEST O1 THROTTLE VALVE

"#$"%C CO'(S& M&C)"%*C"+ M"*%T&%"%C&ST&"M T'(,*%& O$&()"'+ +&SSO% - "& /-/


132/133

1")+ 3-75 S"%&l!t"on Test of Go(eno V!l(es ,23 B: O9e!t"n) Lo!d L"%"te+

M&C)"%*C"+ M"*%T&%"%C& "#$"%C CO'(S&+&SSO% - "& /-0 ST&"M T'(,*%& O$&()"'+


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