MID/AN/92

1. Repairs to 63 KVA voltage stabilizer at LIS Lower Manda. The job involves disconnecting of the Voltage stabilizer from the main power supply (Incoming and Outgoing cables). Loading the voltage stabilizer in the vehicle by using crane and suitable tools and tackle and shifting the voltage stabilizer to workshop. Opening and removing of the panel, loosening /dismantling of the top cover, nut and bolts. Lifting of inside transformer assembly with the chain pulley block for extraction of the complete unit. Dismantling/Extraction of the coils. Thereafter dismantling of the core assembly and extraction of the all burnt copper wire with the help of manual labour and suitable tools/tackles. Rewinding of copper wire of the superior quality and then complete insulating and varnishing of coils. Assembling of the coils to make it a complete unit. Replacement of the rotor switch (3 nos.) by way of p/f of new components, replacing all the damaged /burnt components. Filling of 160litreT.oil in stabilizer after heating of the T.oil. Reinstallation of the stabilizer frame with transformer assembly. Lowering of complete unit in tank after p/f of shock proof gasket and body with nuts/bolts. Shifting the voltage stabilizer to LIS and unloading of the voltage stabilizer at site by using crane Connecting power cables by p/f of new thimbles of the requisite capacity and testing on load. Complete job includes the cost of material, labour charges, transportation charges, hiring charges of tools/tackles required at site. Complete Job 1 Job 2. Repair to 20 HP 3 phase induction motor of pumping unit no.01 installed at LIS Lehrian. The job involves disconnecting the electrical connections from the main supply and disassembling the motor by unfastening the foundation nuts and bolts and decoupling from the pump. Shifting of the motor to workshop by mechanical transport. Then complete dismantling of the motor involves extraction of rotor from stator followed by cleaning of stator and rotor using compressed air, organic solvent, CCL4 etc. to remove the dust particles /silt etc. Extraction of burnt winding from the stator, cleaning of stator with petrol. P/F of new winding wire of suitable gauge & size in the stator, varnishing the stator winding with superior quality of varnish. Drying the stator winding with hot air circulation process. Assembling of the motor. Shifting the motor back to LIS. Refitting the motor at its installed position and coupling with pump, making of electrical connections, alignment with pump, testing of motor on full load. Complete job includes the cost of material, labour charges, hiring charges of tools & tackles, transportation charges. Complete 1Job 3. Repairs to 4 cusec discharge HC pump unit 01 at LIS Lehrian. The job involves decoupling of pump from the motor and removing the top cover, extraction of shaft and impeller assembly together with bearing bracket by using suitable tools & tackles and skilled technicians. Carriage of the impeller shaft assembly by using manual labour, loading in transport vehicle, carriage to the workshop in the mechanical transport for repairs. Repair to impeller shaft assembly at workshop by way of dismantling and extraction of damaged parts. Job includes repairs to pump shaft and impeller at damaged spots by way of re metaling then finishing to proper size so the shaft and impeller should be balanced. Providing and fitting of 2 nos. bearings at driving and non-driving end (according to the sample size). Providing and fitting of new bushes-2 Nos., and applying sufficient amount of grease to avoid excessive wear and tear. Fabrication of glands and studs with nuts. Repair to bearing brackets. Re-assembling of impeller shaft assembly and shifting back to site and there after lowering at proper position, placement of oil seal and closing the top cover along with P/F of new nuts, bolts and studs. Coupling the pump with the motor. P/F of gland packing. Priming the pump. Testing the pump on full load. The Job includes cost of material, labour (skilled and unskilled), loading charges, hire charge of tool and tackles, to and fro carriage charges. Complete Job 01 Job 4 Repairs to 250 mm dia foot valve assembly of pumping unit no.01&2 installed at LIS Lehrian. The job involves disconnecting / dismantling of the foot valve assembly from the suction pipe by deploying manual labour and allied tools & tackles. Shifting / transporting to the workshop. Cleaning by washing with water to make the foot valves completely silt free. After drying them completely, carrying out necessary repair works on the valve surfaces and flanged joints by welding using good quality electrodes. Dismantling of damaged / worn-out foot valve mechanism with flap & rings etc. Complete repair to the damaged flap plate and strainer by way welding. Providing / fitting of new rubber washer cut as per size of the flap plate. Reassembling the foot valve and transporting back to the installation site at LIS. Fitting the valves to the respective suction lines with replacement of damaged rubber gaskets of flanged joints and worn-out nuts, bolts etc. Complete job including cost of material, labour charges, transportation charges and hire charges for tools & tackles. Complete Job 2 Jobs