Turbine Overhaul 2f2r11

INTERNAL USE ONLY

Turbine#2 Overhaul Activities. Presented by1

© Wärtsilä 28 June 2012 VAL site / Neeraj Chourasia.

Neeraj Chourasia

Major Activities in TG Overhaul. • • • •

Collecting all required data/drawings/old protocols/Vibration levels etc. Dismantling of all enclosures around the Turbine. Locking of the Turbine. Dismantling of the coupling guard and couplings between turbine to gear box, gear box to generator. • Checking and recording of the alignment readings between turbine to gear box, gear box to generator. • Removal of Turbine Parting Plane Bolts. • Dismantling and taking out of upper halfs of journal bearings and thrust bearing.

INTERNAL USE ONLY 2

© Wärtsilä 28 June 2012 VAL site /Neeraj Ch

Major Activities in TG Overhaul. • • • • • • •

Dismantling & Overhauling Governing Components. Jacking & Lifting the Turbine Top Casing. Dismantling & Lifting of top guide blade carriers. Record the centering of the turbine rotor. Checking of Axial & Radial clearances of steam glands & inter stage fins. Removal of rotor from position. Removal of bottom halves of journal bearings, thrust bearing housing, steam glands, oil glands, guide blade carriers (all bottom internals) • Bottom guide carriers PP level and thermal gaps checking. • Removal bottom guide blade carriers • Sand blasting of rotor and top and bottom guide blade carriers.

INTERNAL USE ONLY

Major Activities in TG Overhaul.

• • • • • • • • • •

Turbine Bearing Inspection, DP test and Blue matching. Inspection of all seals. Overhauling of Governing Control valves. Overhauling of all the LP and MP control valves trip controller and shaft lifting controller. Servicing and fixing of both ESV. Servicing of Turbine Main Oil pump. Thorough cleaning of the bottom & top casings. Cleaning of the Steam Strainer. Cleaning and polishing of casing bolts Overhauling of Barring Gear and motor.

INTERNAL USE ONLY

Major Activities in TG Overhaul.

• • • • • • • • •

Thorough cleaning of front & rear bearing pedestals. Blue matching & placement of bottom half bearings. Placing & centering of the rotor, if required correct the same. Removal of rotor from position. Placement and maintain PP levels & thermal gaps of bottom guide blade carriers. Checking of radial & axial clearances between rotor blades to stationary blades. Checking of steam gland, inter stage fin clearances. Checking of axial float of rotor and rectification if required. Boxing up of the turbine top guide blade carriers and checking of vertical float of carrier.

INTERNAL USE ONLY

Major Activities in TG Overhaul.

• Casing box up tightening of casing bolts with bolt heating equipment. • Dismantling, Servicing & resetting of trip controller & its associate solenoids. • Alignment between turbine to gear box. • Coupling between turbine to gear box. • Re-assembly of Lube oil and control oil lines around the machine. • Re-starting of the lube oil pump, oil flushing, governing calibration. • Calibration of all governing valves. • Commissioning of the TG set. • Load test of the TG at different loading condition.

INTERNAL USE ONLY