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| 1 | Chain Replacement of Re-Cycle Elevator - A at NP Plant, FACT CD during ATA 2026 |
| 2 | Chain Replacement of Re-Cycle Elevator - A at NP Plant, FACT CD during ATA 2026The scope of work involves - Collection & transportation of the necessary chain links, buckets, bolts, chain blocks, tools, and tackles from the tool crib/ store/ NP Mechanical Maintenance Storeroom to the worksite.In addition, all required site arrangements shall be carried out to facilitate the chain replacement work. Upon receiving clearance from the Officer-in-Charge to commence the work, the top cover, boot doors, side covers, and necessary inspection doors shall be opened.The top covers shall be removed and shifted to the SF Conveyor floor.Necessary arrangement for manual rotation of the Elevator to be done, including the decoupling of the motor-gearbox unit and fixing of cranking lever in the high speed shaft of the gear box.The Back-stopper of the gearbox shall be removed, and suitably position the chain links and buckets by manual rotation of the elevator chain for delinking. The bottom side sprocket assembly shall be lifted with the chain block.Manually rotate the elevator’s top head sprocket to suitably position the buckets at the bottom side of the elevator for ease of dismantling.The buckets, lock pins, and connecting pins of the links shall be removed to dismantle the chain.Delink the chain at the bottom side of the elevator.The new chain shall be linked to the free end of the existing chain and start the dismantling of elevator buckets one by one.The dismantled elevator buckets shall be handed over to the Process Department for cleaning.Any assistance required for repositioning of the buckets during cleaning shall be arranged by the Contractor. Remove all the elevator buckets (approximately 130 Nos.) and the full chain (approximately 400 feet) and replace the existing chain with new one. Free ends of the newly erected chain shall be linked properly with the chain link connecting pin and lock pins.Once the Process Department has cleaned and cleared the buckets for reassembly, the Contractor shall refix the buckets to the new chain.Minor repair/welding of the buckets, drilling holes & providing shim plates etc., wherever necessary for suitably fixing the buckets to the chain is also in the scope of the contractor. The boot covers shall be fixed back in position after releasing the tail end sprocket. Rotate the top head end sprocket manually, tight the bucket bolts and also provide additional check nut if required for securing the buckets.Provide assistance in the removal of coupling spacer, dismantling couplings from the shaft, opening of Head Sprocket Assembly bearing units and servicing and locking of the bearings.Arrange necessary lifting tools, chain blocks etc. at the site as per the instructions from the Technician/Officer-in-Charge for this purpose.Assist in the inspection/repair/replacement of the bottom tail end sprocket shaft bearings.All guide angles shall be checked for tightness, position & damage and shall be rectified/fabricated & replaced properly, if required.Rotate the elevator manually for checkup before trial run and remove the crank lever attachment after getting clearance from the Technician/Officer-in-Charge.Release the chain blocks.Box-up top cover, boot doors, side covers and inspection doors. Fix the back-stopper of the gearbox.The equipment shall be coupled back and take trial run. Satisfactory performance of the equipment shall be ensured and any pending work for achieving this, which is connected with this work, shall be arranged.After one month of commissioning, all the bucket fixing bolts & nuts shall be checked for tightness and to be rectified if required.Any fixture/support fabrication for removing/fixing/shifting of the equipments is under the scope of the contractor.After a successful trial, clear the site, return the chain blocks, tools, and tackles to the tool crib/store, and transport damaged or worn-out parts to the scrap yard or workshop area, as instructed by the Technician/Officer-in-Charge. |
| 3 | Fabrication & Replacement of Elevator Casing Panel of RC ElevatorThe scope of work involves organizing site arrangements and collecting the necessary plates and structural elements from the Store/Plant area.Upon receiving clearance to start the work, the damaged casing panel along with related fittings shall be removed by cutting or grinding or unbolting. The contractor shall fabricate and erect a new set of casing panel using CS/MS plates and appropriate structural members, including provision for handles, hinges, guide angles, manholes, flanges, inspection doors, blind dummies and other related fittings. The scope of work includes cutting, shaping, and assembling CS/MS plates and structural components as per the existing casing panel design. The contractor shall be responsible for fabricating the casing panel from raw materials and replacing the existing damaged casing panel with the newly fabricated one.Full welding shall be carried out on all joints, both internally and externally, followed by thorough grinding to remove any sharp edges/burr.Standard welding procedures shall be followed at every stage.Additional temporary supports shall be arranged as required to ensure safe and smooth progress of the erection activities.Fabrication of hinges, latches, handles, guide angles, manholes, flanges, inspection doors, blind dummies and other related fittings shall be in the scope of this contract.The fabricated parts shall be painted with two (02) coats of zinc chromate yellow primer of approved make / quality and two (02) coats of synthetic enamel paint of distinct colours of approved make / quality. The surfaces to be painted shall be cleaned manually using a wire brush to the extent that the entire surface is free from dirt, dust, oil, grease, or any foreign material.All costs incurred in painting, including the cost of paints, primers, painting equipment, cleaning equipment, handling charges, and any other incidental expenses, shall be within the contractor\"s scope.During panel removal, erection, and throughout the course of the work, the Contractor shall exercise utmost care to support the casing in a manner that ensures its shape is preserved and prevents any deformation.Necessary temporary support structures shall be provided for this purpose. |
