NCTPS II MI Circle Boiler Maintenance Division Unit I 600MW Boiler Annual Overhaul of Air Pre Heater A pass

Charges for checking and cleaning of APH main gear drive unit including decoupling of APH drive from motor, dismantling of fluid coupling, draining of gear box lube oil from gear box, opening of gear box inspection doors and bottom pinion door, cleaning, inspection and Checking of all components inside the gear box and pinion, checking the tapper lock bush, root gap and bottom gap of pinion and pin rack, and grinding the bur projected on bottom surface of the pinion and renewal of lubricant oils and assembly the same. Including cost of consumables and T&P’s.

Charges for checking of Guide bearing, the work includes draining of lube oil from bearing, removal of lube 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 of guide bearing and renewal of new oil and assembly the same including cost of consumables and T & P’s etc.

Charges for dismantling the APH lube oil coolers from bed, removing the internal copper tube assembly, cleaning, servicing, checking and plugging the defective tubes and testing of cooler by hydraulic testing method and reassembling. Including cost of consumables and T&P’s.

Charges for complete overhauling of manhole doors. Including cost of consumables and hire charges for T&P’s.

Charges for providing of scaffolding / temporary platform below the APH inside primary, secondary air duct, flue gas duct side of the APH for renewal of rotor angle, 'T' bar, By pass & CE radial seal setting and removal of scaffolding after completion of renewal work. Including cost of consumables and T&P’s.

Charges for removing the cover of support bearing, cleaning of sump, flushing, rinsing, inspection of internals, overhauling of lubricating lines, checking support bearing levels and providing covers etc in B pass. Including cost of consumables & hire Charges for T & P's.

Charges for checking the rotor level by master level and correcting by loosening / tightening of rotor lock bolt, further providing necessary locking arrangements for rotor, alignment of radial sector plates on both hot and cold end sides and setting of seal clearance by loosening of all radial and By pass seals,fixing of straight edge, removing the bolts and lock nuts By gas cutting, renewal of worn out and damaged radial and by pass seals and refixing of all seals and setting the required seal clearance and tack welding of sector plates & final alignment including cost of consumables and T&P’s.

Charges for loosening and dismantling the cold end / hot end all axial seals, removing the bolts and lock nuts by gas cutting & adjusting the Axial seal plate, the gap between Axial seal plate to sector plate, renewal of worn out and damaged axial seals and refixing of all seals and setting the required seal clearance and tack welding of sector plates and final alignment including cost of consumables and T&P’s.

Charges for lifting of hot end heating element (850mm) baskets by providing lifting arrangements, water washing of the baskets with water & air blowing to remove chocking and refixing in position inside the APH compartment including cost of consumables and T&P’s.

Charges for water washing of the Hot Intermediate Baskets (850 mm) with water wash and air blowing to remove chocking in position inside the compartment including cost of consumables and T&P’s.

Charges for withdrawing, lifting of cold end heating element basket by providing Necessary pulling & lifting arrangements, water washing & air blowing the baskets by keeping outside the APH to remove the Chocking, lifting, aligning, placing in Position inside the APH compartments including cost of consumables and T&P’s.

Charges for erection of high pressure capacity booster pump / jet pump @ 100Ksc discharge pressure, drive motor , electrical push button and its accessories in Unit I boiler for Airpreheater water washing of Cold end baskets, Hot end baskets and hot intermediate baskets including necessary suction & discharge lines and isolation valves. After completion of Airpreheater water washing the same will be dismantled and returned.

Charges for removal of fluid coupling, half multi disc, out put half coupling, damaged worn-out oil seals from the APH gear box and fixing of new oil seal and assembling of all dismantled components. Including cost of consumables and T&P’s.

Charges for removal of coupling half multi disc oil seals, damaged worn-out overrunning clutch/shaft of APH for the main gear box fixing of new or overhauled clutch/reconditioned shaft, assembling of all dismantled components, aligning, commissioning charges inclusive of consumables and T&P’S.

Charges for removal and refixing of support bearing water shield and air sealing ring including cost of consumables & T & P’s.

Charges for reconditioning of the sector plate surfaces by Grinding the high spots & burrs, building of metal by welding in dents and then grinding to get plain surface keeping in position inside the Air Pre Heater. Including cost of consumables and T&P’s.

Charges for Complete overhaul of APH soot blower gear box. Including cost of oil seal & bearings, consumables and T&P’s.

Charges for chipping, breaking and removing of refractory super ceramic packing, graphite rope of Stationary spool retainer ring, dismantling & removal of worn out sealing ring cover cutting, machining fixing new sealing ring Welding grinding, reconditioning of Stationary spool retainer ring in Worn-out portions, reassemble of all Components cutting bending, fabrication & Fixing of guide bearing oil flow Inspection door & breather in cover.

Charges for removal of accumulated ash in ECO outlet to APH inlet area, centre section area, APH inner casing area, SCAPH area of APH A side.

Charges for dismantling of Air motors / inspection the lubricating oil for internals, vanes, bearings and reassembling works. Including cost of consumables and T&P’s.

Overhauling of APH lub oil pumps and its valves for support bear

Charges for cleaning, complete inspection and water washing of SCAPH A pass and attending minor defects if any. Including cost of consumables and T&P’s.

Renewal / Reconditioning of various sizes of metallic expansion joints in Air preheater mentioned below :This work involves arresting the upstream and down stream of duct, cutting and removal of existing eroded cover plate and metalic expansion joints and gauching, leading, lifting, positioning of new expansion joint aligning with the duct channel and complete welding / visual inspection of bellow and marking of wornout and eroded spots, checking of bellow pitch gaps, cutting, grinding and wornout & eroded eroded part of bellow, rectification of expansion joint by patch up work including consumables, scaffolding arrangement and T&p's. 1. Primary air inlet / outlet expansion joint size (Size - 4510 mm x 5860 mm x 186 mm ) - 10 Mtr2. Secondary air inlet / outlet expansion joint size (Size - 7280 mm x 5693 mm x 186 mm ) - 10 Mtr3. SCAPH by-pass Expansion joint Size (Size - 3910 mm x 3910 mm x 186 mm ) - 5 Mtr4. SCAPH inlet Expansion joint size (Size - 3910 mm x 3910 mm x 186 mm ) - 5 Mtr

Charges for leading, lifting and transportation of iron and steel materials from store to site. Charges including for T&P's and consumables. (Elevation -> 20 - 50 Mtr)

Charges for fabrication and erection of MS structurals and patch up work. Charges including for T&P's and consumables. (Elevation -> 20 - 50 Mtr)

Charges for renewal of eroded / wornout bracing pipe supports with new / old pipes of dia 80/100 mm or suitable angle / channel (ECO outlet to APH outlet in flue gas duct) : This work involves cutting and removal of existing eroded / wornout bracing pipe supports in flue gas duct, gouching and edge preparation for the existing gusset plates, notch preparation for bracing pipe supports and fixing with gusset as its original position and welding to complete as directed by Engineer in charge. Charges including for leading, lifting, T&P's and consumables.

Charges for transportation of retrived material and scrap from 23mtr APH to the NCTPS II stores. Charges including charges for T&P's and consumables.

Consumables for overhauling of APH - Door rope 20mm square size

Consumables for overhauling of APH - Oil seals for gear box cover

Consumables for overhauling of APH - Kawool blanket super ceramic fibre blankets

Consumables for overhauling of APH - Special type 'O' ring for LOP cooler

Supply of MS Plate 6mm thkMaterial : IS 2062Including loading, transporting & unloading charges

Supply of Bracing pipeSize : OD 88.9 mm x 5.49 mm thkMaterial : SA 106 Gr BIncluding loading, transporting & unloading charges

Supply of Bracing pipeOD 114.3 mm x 6.02 mm thkMaterial : SA 106 Gr BIncluding loading, transporting & unloading charges