OT-28/20-21

Amount

Opening of all manhole doors & closing manhole doors after completion of work including changing of asbestos ropes and clamps in the doors.

Removal of Ash deposit inside the APH.

Cutting and removing of rigid stoppers checking and correction of rotor leveling, checking and correction of critical distance between guide bearing housing and housing sleeve and fixing, welding the rigid stoppers and provide shim packing in between guide bearing housing and permanent stoppers

Removal of worn-out/damaged bypass seals (complete assembly CE & HE) fixing and positioning properly with new seals, new HT bolts. (Including transporting of new materials from stores to site and scraps from site to stores).

Fixing up straight edge after finding the low point of sector plate adjusting the radial seals to correct clearance, clamping the seals in both hot end and cold end of APH.

Fixing up straight edge after finding the low point of axial seal plate, adjusting the axial seals to correct clearance, clamping the seals properly in both hot end and cold end of APH

Removal of damaged / eroded 'L' bars, refixing new / old 'L' bar and adjusting to correct radius and clamping properly.

Replacing of rotor post seal at hot end cutting of sealing ring segments, cutting of tracking rod stuffing boxes, kawool packing, patch up sealing ring segments, leak arresting works around the guide bearing area fixing of rotor post seals and rectification works on the eroded portions of spool seal assembly.

Overhaul of APH soot blower mechanism including inspection,changing the bearings if required and lubrication etc., (Bearing supplied by TANGEDCO)

Removal of worn - out radial seal in both cold end and hot end and re fixing with new HT bolts & nuts and positioning (including transporting of new materials from stores to site and scraps from site to stores).

Removal of worn-out axial seal in both cold end and hot end re fixing with new HT bolts and positioning. (including transporting of new materials from stores to site and scaps from site to stores).

Cutting the 6mm MS Plate in to required size, leading, lifting, positioning on the eroded portions of APH duct, welding the same and transporting of scrap materials to stores. (M.S. Welding electrode (Overcord-S/D&H Medio or other equivalent) is on contractor's scope).

Reconditioning / renewal of static seal assembly in the Radial sector plate.

Water washing of Air Pre Heater.

Removal of Cold end heating elements from its position, leading to the adjacent area of the Air Pre heater, dry cleaning, high jet pressure water cleaning and then air cleaning and putting back the same / New heating elements after renewal of Cold end support frame and diaphragm plate.

Loading, transporting the new Cold end heating elements to boiler area, unloading and lifting the new baskets (300 mm height) from ground floor to 14 mtr floor and lowering the eroded Cold end heating elements from 14 mtr level to ground floor and devoluting to stores.

Removal of Hot end sacrificing heating elements from its position, leading to the adjacent area of the Air Pre heater, dry cleaning, high jet pressure water cleaning and then air cleaning and putting back the same / New heating elements after renewal of Hot end support frame and diaphragm plate.

Rectification of hot end stationary spool and renewal of the retainer ring, packing rings and etc.,

Providing platform at cold end area for rectficaction work in soot blower

Renewal / Rectification of eroded soot blower nozzle (5 Nos)

Renewal / Rectification of eroded soot blower pipe assembly.

Overhauling of the Air Pre Heater eroded portion of the center section of the guide bearing.

Checking of Guide bearing/ Support bearing, the work includes draining of lub oil from bearing, removal of lub oil inlet and outlet pipe lines from guide bearing housing, removal of guide bearing housing cover, checking and correcting the guide bearing level, providing necessary lock cleaning and flushing of guide bearing, inspection of guide bearing, checking and correcting the level og guide bearing and renewal of new oil and assembly the same including cost of consumables and T & P's etc.,

Renewal of the APH (Gear box) motor shaft oil seal and air motor shaft oil seal.

Renewal of Air motor clutch assembly APH 'A'.

Overhauling of rotor shell, Diaphragm plate above 300 mm and intermediate heating elements support bars.

Patch up work on the eroded portion of the cold end Diaphragm plate

Transpoting the refractory from Mtps II central store to boiler "0" mtr and leading and lifting to Boiler required area required elevation by providing chain block, pulley and rope.

Removing of old refractory and bringing to ‘0’m, including cost of all consumables, tools and plants etc.,

Providing shuttering for refractory and Applying new refractory in the required area including consumables and hire charges for T&Ps.

THIAGARAJAN ENGINEERING CONTRACTOR