Erection Sequence Of Steam Turbine 1x2u4k

ERECTION SEQUENCE (For 500 MW Fixed pedestal type Turbine with spring loaded foundation) 1. Cleaning and checking of Turbine and Generator foundations as per the transverse and longitudinal axis including their elevation. 2. Prepare and install LP base plates, HP front pedestal, HP rear pedestal, LP front pedestal, LP rear pedestal along with their anchor bolts and anchor plates. 3. Provisionally

align and level all the pedestal and LP base

plates as per the

transverse and longitudinal axis including their elevation. 4. Matching of anchor plates of pedestal and LP base plates to ensure their perfect seating. 5. Finally align and level HP front, HP rear, LP front and LP rear pedestals along with LP base plates as per the transverse and longitudinal axis including their elevation and catenary as per the design. 6. Prepare and install steel bars for LP casing centralising keys in foundation slab as per the required center line . 7. Weld locating ring of LP front pedestal and steel bars of LP front and LP rear centralising keys. 8. Prepare shuttering and grouting of the pedestals and LP base plates including anchor plates of HP rear pedestal. 9. Prepare, install, align/ level both the LP girder along with their carrier plates. 10. Prepare , install and assemble LP front and rear end walls with the LP girders. 11. Level / align LP outer casing lower half as per the transverse and longitudinal axis of the machine. 12. Install permanent packers of LP outer casing including their radial and axial keys. 13. Prepare and install LP inner outer casing along with gusset plates in position Bharat Heavy Electricals Limited Rev 00, 7-98

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14. Align LP inner outer casing lower half and level it. Install LP casing parting plane platform . 15. Prepare and install LP front and LP rear lower half shaft seals housing and align it provisionally. 16. Prepare and install LP rotor along with their bellows in position. 17. Align LP rotor radially and axially in position and record free run out of rotor. 18. Record/ Ensure radial and axial clearances of the LP casing including rotor float including fitting of final axial keys of the LP inner casing . 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. Transfer the load of HP rotor on bearings from the transport device and align it radially and axially. 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. (In case IP module is sent to site in disassembled condition, refer Instruction T1-08-0606G. 25. Loading of IP rear end of the shaft on bearing and removal of transport device. 26. Provisionally align HP , IP and LP rotor . 27. Couple HP / IP rotor on temporary Bolts and align rotor / casing radially and axially. 28. Record/ Ensure IP rotor float by shifting HP casing axially. 29. Conduct Horn drop test of HP casing without any radial and axial keys and pipe lines. 30. Conduct Horn drop test of IP casing without IP inlet upper half pipe lines. 31. Assembly of breech nut of HP casing and Main Steam Stop & Control valve assembly.

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32. Erection of Reheat Stop & Control valve assembly. 33. Weld IP inlet upper half pipe and record Horn drop values without radial-axial keys. 34. Alignment of HP/IP/LP rotors and their coupling on temporary bolts including its couple runout. 35. Swing check of HP rotor on its front end with temporary alternate bolt tightened on HP/IP coupling . 36. MOP alignment and its doweling. 37. Reaming/honing of HP/IP and LP/IP coupling including fitting of final coupling bolts. 38. Fixing of axial position of shaft and assembly of thrust bearing including its colour matching. 39. 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). 40. Assembly of bearings and checking of all clearances including fittings of side pads of bearing, yoke keys etc. 41. Turbovisory works in all the pedestal i.e. assembly and calibration of thrust bearing axial

shift, LP rotor expansions pick up, Hall generator and thermocouples of

bearing . 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 Instruction No. T1-08-0909G. 45. Decoupling of HP / IP, LP/IP, LP/Gen., Gen./Exciter coupling and rechecking of alignment/catenary after floating of TG deck spring. 46. 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.

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47. Checking /Correction of LP shaft seal clearance after floating of TG deck with CW pump in operation and water in the hot well of condenser upto operating level. 48. Roll check of HP, IP casing in up and down direction only with TG deck in floating condition and CW pump in operation including water in hot well upto normal level. 49. Assembly of final packers of the HP, IP casing after completing the roll check in up and down direction. 50. Recording of final Horn drop of HP and IP casing after completing the welding of HP inlet, HP exhaust , IP inlet and Cross around piping. 51. Preparation and boxing up of LP casing after competing the full Roll check of LP casing and fitting of final casing packers and radial keys. 52. Barring gear.

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