Tamil Nadu Generation And Distribution Corporation Limited Tender

Dismantling of hot end static seals provide at a hot end sector plate by arresting the static seal plates using Chain Blocks, gas cutting and goughing of static seals without damaging the sector plate and centre section plate at inside the APH and re-erection of a new hot end static seals of sector plate in position by welding with center section plate and a new sector plate erected with proper clearence between guiding surfaces.

Dismantling of a hot end Sector plate Guide pins located at in board and out board of APH by gas cutting and removing from the top of centre section plate at the top of Air Pre Heater and mechanical cleaning of pins and re-erection of dismantled Sector plate Guide pins in position by welding with center section plate after the erection of a new hot end sector plate.

Removing of Inboard adjuster screw and out board adjust screw of a hot end sector plate one by one after arresting and supporting the sector plate. Mechanical cleaning of all adjuster screw and threaded holes in center section plate and re-assembling the adjuster screw with center section plate and sector plate after positioning of a new hot end sector plate in exact location.

Cutting and removing of bracing support pipes at APH flue gas hot end side to facilitate to mobile the lowered the sector plate by rotating the APH rotor and re-erection of removed bracing pipes by welding in position after the erection of new hot end sector plate.

Arresting of existing wornout sector plate by chain block and hydraulic jack after removing of adjuster screws and guide pins, lowering of sector plate gradually and placing it on APH rotor by providing proper packing and releasing of chain block supports, Lifting of a sector plate at in-board mounted on self aligning roller by means of jack and keep it without touching the guide bearing spool and static part of APH, cutting of roller brackets, releasing of lowered sector plate by mobilizing on flue gas side, lifting and drawing outside of Air pre heater through the opening made in Air pre heater flue gas side shell body mother plate, leading and lowering of removed worn-out hot end sector plate from 19.15mtr Air pre heater floor level to '0' mtr boiler floor by means of motor operated winch, transporting and devoluting to store.

Erection of a new hot end sector plate, this work includes transporting of sector plate from store to site, leading and lifting of a new hot end sector plate from '0' mtr boiler floor to 19.15mtr Air pre heater floor level by means of motor operated winch and inserting the new sector plate through the flue gas shell body mother plate opening by means of chain blocks support, placing the sector plate on rotor out board by packing with hydraulic jacks in proper orientation on the APH rotor, lifting of a sector plate at in-board by means of jack without touching the static part of APH and sector plate in board mounting roller, releasing of chain block supports from static body of APH, mobilizing the new sector plate to the existing wornout sector plate removed location by means of rotating the APH rotor and re-assembling the new hot end sector plate in position as per standard procedure and aligning of sector plate as per the standard alignment protacal.

Commissioning after the completing of new hot end sector plate erection works and providing field support for monitoring the performance till the Unit attain maximum generation.