(A.) Repairing of critical cracks in Live Ring Roller Pads (baseANDrotate Frame), Base Centre pintail, Base ChambersANDRotate frame structure above Rail segment machining pad of 24/96 Krishna DL (B.) Estimate of Repairing of cracks in swing shaft be

Amount

Name and scope of Part A: Repairing of critical cracks in Live Ring Roller Pads (base & rotate Frame), Base Centre pintail, Base Chambers & Rotate frame structure above Rail segment machining pad of 24/96 Krishna DL having scope of work as follows: 1. Thorough Joint cleaning: Ensuring that the joint is thoroughly cleaned prior to welding is essential to achieve high-quality welds. 2. Crack Removal Confirmation: It is crucial to confirm the complete removal of any cracks through DP Test. 3. Preheating the joint: Preheating the joint before welding helps to prevent thermal shock and reduce the risk of cracking. 4. Maintaining Interpass Temperature: Carefully maintaining the Interpass temperature is necessary to ensure the integrity of the weld. 5. Post-Heating the Weld Joint : Post-Heating the weld joint after completion helps to relieve residual stresses and reduce the risk of cracking 6. UT test 7. Controlled cooling Rate: After welding is completed, it is imperative to properly cover the weld joint to control the cooling rate, preventing the formation of undesirable microstructures. 8. Submission of Report. Note: 1. Welding electrode per crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure: 8018 , 3.15 mm : 5 kg & 8018 , 4mm : 10kg 2. Welding electrode per crack in various chambers of Dragline : 8018 , 3.15 mm : 2 kg & 8018 , 4mm : 5 kg

Cost/ charges for Grinding of crack for V preparation including charge of grinders , grinding wheel & accessories (average grinding hrs/ crack is 8 hrs) for 01 crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure . ( Total 45 Nos. cracks)

Cost/ charges for DP test 3 times (after root , after 03 layer, after final welding) (3 nos per crack) for 01 crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure . ( Total 45 Nos. cracks)

Cost/ charges for UT test for 01 crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure . ( Total 45 Nos. cracks)

Cost/ charges for Stress relieving control heating up to 600 degree celcius & cooling for 01 crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure . ( Total 45 Nos. cracks)

Cost/ charges for Repairing of 01 no. crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure including labour charges , contractor profit , etc. (labour consisting of Skilled fitter , Skilled welder/Gas Cutter , Unskilled helper ) . ( Total 45 Nos. cracks)

Cost/ charges for Hiring of Welding machines with all accessories for 01 crack in Roller pads (base & rotate frame ) Base Center pintle , Rotate frame structure . ( Total 45 Nos. cracks)

Cost/ charges for Grinding of crack for V preparation including charge of grinders , grinding wheel & accessories (average grinding hrs/ crack is 8 hrs) for 01 crack in various chambers of the dragline. ( Total 40 Nos. cracks)

Cost/ charges for DP test 3 times (after root , after 03 layer, after final welding) (3 nos per crack) for 01 crack in various chambers of the dragline. ( Total 40 Nos. cracks)

Cost/ charges for UT test for 01 crack in various chambers of the dragline. ( Total 40 Nos. cracks)

Cost/ charges for Stress relieving control heating up to 600 degree celcius & cooling for 01 crack in various chambers of the dragline. ( Total 40 Nos. cracks)

Cost/ charges for Repairing of 01 no. crack in various chambers of the dragline including labour charges , contractor profit , etc. (labour consisting of Skilled fitter , Skilled welder/Gas Cutter , Unskilled helper ) . ( Total 40 Nos. cracks)

Cost/ charges for Hiring of Welding machines with all accessories for 01 crack in various chambers of the dragline ( Total 40 Nos. cracks)

Name and scope of Part B: Estimate of Repairing of cracks in swing shaft bearing housing and lower swing shaft spacer housing by mean of dismantling of both swing shaft (upper & lower)of 24/96 Krishna Dragline having scope of work as follows: 1. Cleaning of entire working area. 2. Cutting & removing of damaged portion of Housing area. 3. ‘V’ groove making by grinding, etc. in cracked area. 4. Welding of Cracks by suitable electrode. 5. D.P. Test (after root , after 3 layer & after final welding) 6. Welding of stiffener plates where required. Note: Welding electrode 8018 as per requirement will be provided by NCL

Cost/ charges for Cleaning of working area of 01 no. including labour charges , contractor profit , etc. (labour consisting of Unskilled helper ) . ( Total 03 nos)

Cost/ charges for Crack repairing including labour charges , contractor profit , etc. (labour consisting of Skilled fitter , Skilled welder , Semi skilled manpower ) . ( Total 03 Nos.)

Cost/ charges for DP test (after root , after 03 layer, after final welding) (3 nos per crack) 3 times in 10 cracks. ( Total 03 Nos.)

Name and scope of Part C: Repair of cracks in RHS rear A-frame leg & both LHS & RHS Boom foot points of 24/96 KRISHNA Dragline at Nigahi Project having scope of work as follows: 1. Cleaning of cracks by removing dust, grease & paint, etc. 2. ‘V’ groove making by grinding, etc. in cracked area. 3. Welding of joint by suitable electrode. 4. Perform D.P. test after root layer and every 2-3 layers. 5. Performing NDT. 6. Providing re-enforcement bars/plates if required.

Cost/ charges for removing 01 no. crack by grinding , 'V' groove making & welding , etc.including labour charges , contractor profit , etc. (labour consisting of Skilled fitter , Skilled welder ,Semi-skilled manpower) . ( Total 3 Nos. cracks)

Cost/ charges for DP test 3 times (after root , after 03 layer & after final welding) (3 nos per crack) for 01 crack . ( Total 3 Nos. cracks)

Cost/ charges for UT test for 01 crack . ( Total 3 Nos. cracks)

Cost/ charges for Hiring of Gas Cutting Sets. with all accessories for 01 crack . ( Total 3 Nos. cracks)

Cost/ charges for Hiring of welding machines with all accessories for 01 crack . ( Total 3 Nos. cracks)

Cost/ charges for Hiring of grinding machines , grinding wheels with all accessories for 01 crack . ( Total 3 Nos. cracks)

Cost/ charges for Welding Electrode L&T NH660 4mm : 20kg for 01 crack . ( Total 3 Nos. cracks)

Total impact of GST for the purpose of CTC