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| 1 | Round the clock Routine and Preventive Maintenance works of Bowl Mills (HHP-803) Raw Coal Feeders. [03 shifts X 730 (365+365) days=2190 shifts]. |
| 2 | Break down maintenance works of Bowl Mills (HHP-803) (Round the clock) |
| 3 | Replacement of Roller Journal assembly. (One RJ assy makes one Job). |
| 4 | Changing trunnion position of RJ assembly. (One trunnion of one mill makes one Job). |
| 5 | Replacement of worn out grinding roll with new /healthy one, including servicing RJ assembly. |
| 6 | Overhauling of pressure spring assembly (One spring assy of any mill shall be considered as one qty.) |
| 7 | Replacement of pressure spring assembly (One spring assy of any mill shall be considered as one qty.) |
| 8 | Servicing/ repairing of spring support cover by machining/ tapping etc. |
| 9 | Replacement / Servicing of Journal stop bolt. |
| 10 | Attending dust leakage from Journal opening cover by refitting it. |
| 11 | Replacement of bull ring segment assembly when replacement of RJ assembly has been given as separate job (Separate Job for removing and fixing of all three RJ assembly shall be given). |
| 12 | Replacement of bull ring segment assembly while at least one RJ assembly is inside the bowl mill. |
| 13 | Refitting of dislocated clamping ring/bull ring segment, when replacement of RJ assembly has been given as separate job (Separate job for removing and fixing of all three RJ assembly shall be given). |
| 14 | Refitting of dislocated clamping ring/bull ring segment, while at least one RJ assembly is inside the bowl mill. |
| 15 | Replacement of airport ring assembly, when replacement of RJ assly has been given as separate job. Complete one set (one set consist of 06 pieces). |
| 16 | Repairing of airport ring assembly in installed condition, When replacement of RJ assembly has been given as separate job (Separate job for removing and fixing of all three RJ assembly shall be given). |
| 17 | Repairing of airport ring assembly in installed condition, while at least one RJ assembly is inside the bowl mill. |
| 18 | Repairing/Replacement of bowl extension ring segment, when replacement of RJ assembly has been given as separate Job. |
| 19 | Repairing/Replacement of venturi, while replacement of MPO & MDV are awarded as separate Job. |
| 20 | Repairing/Replacement of venturi, while MPO & MDV are in their installed condition. |
| 21 | Repairing of venturi outlet in installed condition. |
| 22 | Replacement of MPO. |
| 23 | Replacement of MDV. |
| 24 | Replacement of (leaking) Victaulic coupling silicon gasket of MPO/MDV/ transition piece. |
| 25 | Replacement of classifier inner cone, when replacements of RJ assemblies have been given as separate Jobs. |
| 26 | Fabrication and fixing of air duct vanes. |
| 27 | Repairing of \"O\" collar assly. |
| 28 | Repairing Eroded portion of classifier inner cone. |
| 29 | Replacement/refitting/ Servicing of classifier blade. |
| 30 | Adjustment of classifier blade operating linkage mechanism. |
| 31 | Replacing/Repairing of scrapper guard assembly. |
| 32 | Replacement of mill side liner, when replacement of RJ assembly has been given as separate Job. |
| 33 | Repairing of Mill side liners by patching/welding (MS plate of thickness-10/12mm for patching may be arranged from scrap). |
| 34 | Repairing/Replacement of mill side bottom liner. |
| 35 | Replacement of bottom insulation cover plate (Complete set). |
| 36 | Repairing of bottom insulation cover plate. |
| 37 | Checking and inspection / Replacement of Labyrinth seal set inside the mill liner body of mill. |
| 38 | Refitting/Replacement of dislocated upper skirt assembly. |
| 39 | Decoupling, performing alignment of mill-motor complete coupling and final coupling. |
| 40 | Replacement of damaged mill motor and worm input shaft coupling with new one/repaired of bowl mill and perform alignment. |
| 41 | Repairing of separator body, when replacement of RJ assemblies have been given as separate Jobs . |
| 42 | Replacement of bowl hub cover, when replacement of RJ assemblies has been given as separate Job. |
| 43 | Making threaded hole of any diameter on any surface of bowl mill by drilling and tapping. |
| 44 | Servicing of oil coolers of mills in installed condition. (one cooler of one mill make one Job). |
| 45 | Replacement/Refitting of braided hose of lube oil pipe line. |
| 46 | Servicing of seal air valve on seal air header of mills. |
| 47 | Hard facing of bowl mill spares by 2” chequering pattern using sequence welding technique in installed condition. |
| 48 | Complete dense hard facing of cap of airport ring assly & Bowl extension ring with hard facing electrode. |
| 49 | Fabrication & Fitting of Guard/covering/ shroud of RJ assembly housing by 8/10/12mm thick MS/ sailma plate. |
| 50 | Complete Overhauling of RJ assembly. |
| 51 | Servicing of Hot air gate. |
| 52 | Servicing of Hot air damper. |
| 53 | Servicing of Cold air gate. |
| 54 | Servicing of Cold air damper. |
| 55 | Attending coal dust leakage from centre feed pipe/coal pipe. (One patch (min size-200x200mm) makes one Job). |
| 56 | Servicing of lube oil system of mills (one mill make one Job). |
| 57 | Servicing of oil coolers of mill lube oil system by taking out the cooler from the lube oil system. (One cooler of one mill make one Job). |
| 58 | Metalizing & hard facing of clamping rings of bull ring segment (All 4 rings make one job). Metalizing welding electrode is in firm scope. Hard facing welding electrode shall be provided by Nigam . |
| 59 | Repairing / Welding work in Cold air Duct/ Hot air duct. |
| 60 | Changing worn out coal pipe (full length or piece)/bend with new one (One pipe/bend make one Job). |
| 61 | Changing of worn out /damaged centre feed pipe of milling system. |
| 62 | Cleaning, Greasing, Servicing of electrical operated hoist (one job for fifteen days). |
| 63 | Servicing of all electrical operated hoist of mill site.(5+1). |
| 64 | Taking out one no R.J. assembly from any bowl mill by taking out Journal cover. |
| 65 | Fixing of one no RJ assembly in any bowl mill when Journal opening cover is already opened. |
| 66 | Checking & Inspection / Replacement of (If found damaged) bearings with new one of input shaft (Worm shaft) of Gear Box of Bowl Mill. |
| 67 | Replacement of broken bolt of mill body to separator top and bottom liner. |
| 68 | Repairing & Reconditioning of eroded portion of bowl ( erosion due to worn out of bull ring segment) in installed condition by metalizing, hard facing, grinding and blue matching of bowl surface with bull ring segment erosion size up-to or less than 4\" X 4\" of 1 segment. |
| 69 | Repairing & Reconditioning of eroded portion of bowl ( erosion due to worn out of bull ring segment) in installed condition by metalizing, hard facing, grinding and blue matching of bowl surface with bull ring segment erosion size more than 4\" X 4\" and up-to 6\" X 5\" of 1 segment. |
| 70 | Repairing & Reconditioning of eroded portion of bowl ( erosion due to worn out of bull ring segment) in installed condition by metalizing, hard facing, grinding and blue matching of bowl surface with bull ring segment erosion size more than 6\" X 5\" of 1 Segment. |
| 71 | Replacement of worn out grinding roll with New / healthy one. |
| 72 | Replacement of Broken bolt of R.J. Pressure Spring assembly cover. |
| 73 | Replacement of Oil seal of Main shaft of mill Gear box . |
| 74 | Replacement of Oil seal of worm shaft (DE / NDE) of mill gear box. |
| 75 | Servicing of mill lube oil pump. |
| 76 | Replacement of serviced / New Lube oil pump of Bowl mill. |
| 77 | Servicing / Replacement of stop bolt bushing by opening R.J. cover of mill. |
| 78 | Dismantling of bowl hub from mill gear box housing and then making arrangement for the lifting up of bowl hub to decouple the bowl hub from gear box housing. |
| 79 | Removal and shifting of mill gear box from its base to take it out side in maintenance way. |
| 80 | Dismantling of gear box and removal of vertical shaft from mill gear box. |
| 81 | Dismantling of worm gear from its hub. |
| 82 | Replacement of all bearing of vertical shaft assembly with new one. (Upper Radial bearing, thrust bearing and lower radial bearing). |
| 83 | Assemble the New/Repaired worm gear on its hub by proper heating arrangement. |
| 84 | Shifting of assembled mill gear box on its base from maintenance way. |
| 85 | Shift the Bowl hub to its original position and matched with the gear box top. Couple the Bowl hub with Gear box and tighten all the bolts fully. |
| 86 | Assembling of Bowl hub cover of mill and install the liner with mill plate of thickness-12 to 16 mm of air port assembly after the fitment of bowl at their original position. |
| 87 | Servicing of Pyrite Hopper Inlet / Outlet valves of Mill reject system of bowl mill. |
| 88 | Repairing of pyrite hopper of Mill reject system by patch work /welding work. |
| 89 | Breakdown Maintenance works of Raw Coal Feeders (Round the clock). |
| 90 | Complete overhauling of RCF. |
| 91 | Repairing/ Replacement of RCF Chain Link (scrapper) (one link make Job). |
| 92 | Replacement /Repairing of double roller chain of driving arrangement. |
| 93 | Servicing of clutch assembly. |
| 94 | Repair of RCF Body worn out portion. |
| 95 | Servicing/overhauling of Gear Box of RCF. |
| 96 | Fabrication and Replacement of RCF Hopper chute to center pipe of mill. |
| 97 | Replacement of Main gear box / clutch assembly of RC Feeder with new/serviced. |
| 98 | Alignment of Main Gear Box and clutch with feeder motor. |
| 99 | Checking and removing defects of Scrapper chain tensioning arrangement (Tension end assy). |
| 100 | Checking and removing defects of chain link drive arrangement. |
| 101 | Checking and Replacement of DE / NDE side Bearings of Feeder |
| 102 | Checking and Replacement of DE / NDE side Sprocket of scrapper chain of Feeder |
| 103 | Repairing of scrapper chain link Guard of raw coal feeder |
| 104 | “Round the clock dragging, accumulating lifting and shifting of CMR to coal yard, General cleaning and removal of cocking of mill and fan area of Unit#7 HTPS \" . |
| 105 | Round the clock lifting and shifting of coal Mill rejects spelled out from Pyrite Hopper and Mills (at ‘0’ Meter) of Unit # 7, 1X110MW, HTPS, Kasimpur to Coal yard of old Plant or other specified places within the HTPS, Plant. |
| 106 | Cleaning of mill floor (‘0’ & ‘3.5’ meter), mill associated auxiliaries, pulverize coal pipes, structure of mill, duct connected to mill at 3.5 meter floor, classifier top, Removing of settled coal/coal dust at Hot air gate/cold air gate and its platform, and ID/FD/ PA/Seal air fan foundation floors of Unit # 7. |
| 107 | Cleaning of Feeder floor & associated structure to feeder floor of Unit #7 . |
| 108 | Cleaning of ID, FD, PA and seal air fan floor, area infront of site store, trenches etc. and cutting and removal of grass/wild vegetation in ‘0’ meter (except Ash handling area) of Unit # 7 |
| 109 | Removal of major chocking of bowl mill & center pipe of bowl mill (From feeder outlet gate to liner body of mill) of Unit #7. |
| 110 | Removal of chocking/foreign material of Coal feeder to facilitate normal running of feeder of Unit # 7. |
| 111 | Cleaning of P.A. duct internally from hot air gate to mill side liner body of Unit # 7. |
| 112 | Round the clock dragging and accumulating the CMR from outlet gate of Pyrite hopper during running of bowl mills |
| 113 | Round the clock manual operation of Pyrite hopper manual gate of mill reject system |
| 114 | Breakdown Maintenance works of Coal Pipe of Unit#7, CTPS, HTPS |
| 115 | Removing Chocking of Coal Pipe whenever any coal pipe found chocked. One coal pipe any mill make one job. |
| 116 | Patch work of coal Pipe |
| 117 | CHANGING OF VICTAULIC COUPLING GASKET |
| 118 | REPAIRING OF COAL PIPE BENDS |
| 119 | REPLACEMENT OF COAL PIPE HANGERS |
