Z03Aersq

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STEAM TURBINE (500 MW)ERECTION

ERECTION SEQUENCE

ERECTION SEQUENCE BAR CHART OF 500 MW TG WITHSPRING LOADED FOUNDATION

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3

1

2

3

4

5

6

7

8

9 Prepare, install, align/ level both the LP girder along with their carrier plates.

10

11

12

13 Prepare and install LP inner outer casing along with gusset plates in position

14

15

16 Prepare and install LP rotor along with their bellows in position.

ACTIVITY WEEK 0

Cleaning and checking of Turbine and Generator foundations as per thetransverse and longitudinal axis including their elevation.

Prepare and install LP base plates, HP front pedestal, HP rear pedestal, LPfront pedestal, LP rear pedestal along with their anchor bolts and anchor plates.Provisionally align and level all the pedestal and LP base plates as per thetransverse and longitudinal axis including their elevation.

Matching of anchor plates of pedestal and LP base plates to ensure their

perfect seating.

Finally align and level HP front, HP rear, LP front and LP rear pedestalsalong with LP base plates as per the transverse and longitudinal axisincluding their elevation and catenary as per the design.

Prepare and install steel bars for LP casing centralising keys in foundationslab as per the required center line .

Weld locating ring of LP front pedestal and steel bars of LP front and LP rear centralising keys.

Prepare shuttering and grouting of the pedestals and LP base platesincluding anchor plates of HP rear pedestal.

Prepare , install and assemble LP front and rear end walls with the LPgirders.Level / align LP outer casing lower half as per the transverse andlongitudinal axis of the machine.

Install permanent packers of LP outer casing including their radial and axialkeys.

Align LP inner outer casing lower half and level it. Install LP casing partingplane plateform .

Prepare and install LP front and LP rear lower half shaft seals housing andalign it provisionally.

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ERECTION SEQUENCE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ACTIVITY WEEK 0

17 Align LP rotor radially and axially in position and record free run out of rotor.

18

19 Box up LP inner inner casing and heat tighten the parting plane bolts.

20 Box up LP inner outer casing .

21 Prepare and place HP module in position on temporary packers.

22

23 Check free run out of HP rotor on journal and coupling face including its float.

24 Prepare and place IP module in position on temporary packers.

25 Loading of IP rear end of the shaft on bearing and removal of tranport device.

26 Provisionally align HP , IP and LP rotor .

27

28 Record/ Ensure IP rotor float by shifting HP casing axially.

29

30 Conduct Horn drop test of IP casing without IP inlet upper half pipe lines.

31 Assembly of breach nut of Main Steam Stop & Control Valve

32 Erection of Reheat Stop & Contro valve assembly.

33

34

35

36 MOP alignment and its dowelling.

Record/ Ensure radial and axial clearances of the LP casing including rotor float including fitting of final axial keys of the LP inner casing .

Transfer the load of HP rotor on bearings from the transport device and alignit radially and axially.

Couple HP / IP rotor on temporary Bolts and align rotor / casing radially andaxially.

Conduct Horn drop test of HP casing without any radial and axial keys andpipe lines.

Weld IP inlet upper half pipe and record Horn drop values without radial.axialkeys.

Alignment of HP/IP/LP rotors and their coupling on temporary bolts includingits couple runout.

Swing check of HP rotor on its front end with temporary alternate bolttightened on HP / IP coupling .

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ERECTION SEQUENCE

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 ACTIVITY WEEK 0

37

38

39

40

41

42 Preparations of the bearing for oil flushing.

43 Oil flushing of the machine and normalizing the bearing after oil flushing.

44 Preparation and floating of TG deck as per the laid down procedure .

45

46

47

48

49

50

51

52 Barring gear.

Reaming/honing of HP/IP and LP/IP coupling including fitting of final couplingbolts.

Fixing of axial position of shaft and assembly of thrust bearing including itscolour matching.

Roll check of HP/IP casing and fixing of radial and axial keys of the casing(Casing final packers need not to be put at this stage).

Assembly of bearings and checking of all clearances including fittings of sidepads of bearing, yoke keys etc.

Turbovisory works in all the pedestal i .e. assembly and calibration of thrustbearing axial shift,LP rotor expansions pick up, Hall generator andthermocouples of bearing .

Decoupling of HP / IP, LP/IP, LP/Gen., Gen./Exciter coupling and recheckingof alignment/catenary after floating of TG deck spring.

Final tightening of HP/IP, IP/LP , LP/Generator and Generator / Exciter coupling after correcting the alignment including their couple run out and

swing check of rotor on HP Front and exciter rotor.

Checking /Correction of LP shaft seal clearance after floating of TG deck withCW pump in operation and water in the hot well of condenser upto operatinglevel.

Roll check of HP, IP casing in up and down direction only with TG deck infloating condition and CW pump in operation including water in hot well uptonormal level. Assembly of final packers of the HP, IP casing after completing the roll checkin up and down direction.

Recording of final Horn drop of HP and IP casing after completing thewelding of HP inlet,HP exhaust , IP inlet and Cross around piping.

Prepration and boxing up of LP casing after competing the Roll check of LPcasing and fitting of final casing packers and radial keys.

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ERECTION SEQUENCE

Bharat Heavy Electricals LimitedRev 00, 7-98

Ti-08-0303GPage No. 8 of 7

43

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7/30/2019 Z03Aersq



ERECTION SEQUENCE

Bharat Heavy Electricals LimitedRev 00, 7-98

Ti-08-0303GPage No. 10 of 7

43

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