Recapitalization of 1500 H.P (1120 kw) HT Induction Motor (Cromptom Greaves Make) of

Amount

Recapitalization of 1500 H.P (1120 kw) HT Induction Motor (Cromptom Greaves Make) of unit no 05 along with allied works installed at LIS Basantpur (As per scope of work Annexure C of SBD)Recapitalization of 1500 H.P (1120 kw) HT Induction Motor (Cromptom Greaves Make) along with allied works installed at LIS Basantpur by way of disconnecting all electrical connections, LRS junction box connections, decoupling/ dismantling of slip ring assembly and driving coupling of motor. Lifting and shifting of motor by EOT crane on motor stand with coupling hub clear off the ground. Dismantling of motor, complete dismantling of driving and non driving ends of motor and then extraction of rotor form stator. Cleaning the stator with blower, De-soldering all the connections of the stator coils to make each coil independent. Extraction of damaged coils by heating with D.C. Magneto type welding set. The coils are to be extracted in such away that no further damage is caused to the coils. Scrapping off old insulation material from all the coils and their grooves. The coils are to be scrapped in such a way that copper strip coils are not damaged. Rebuilding, Reconditioning the damaged slots of the stator with the help of angular grinder, replacement of the damaged coils by way of providing new copper conductors. Joining the same with high class joining copper material ( brazing ). Complete re-insulation of all the coils with the new “F” class insulation material of high quality such as glass tape, mica tape, liner nomax paper, tiresome tape, Bakelite separator wedges etc, insertion of same in slots of stator with the help of nomax paper and separator wedges. Also insertion of packing / anti-vibration blocks and locking the same properly. Soldering all the coil connections properly, insulating the connections of the stator coils and also the connections connecting the stator winding to the stator cable leads. Cleaning the complete stator with CRC-226. Applying Becktol red / grey varnish to stator and drying out the stator under controlled temperature of 90 degree C max. Continuing the drying out process till the required IR value and PI value is achieved. Complete job including the cost of material and labour charges. Extraction of worn out bearings from drving end and non driving ends of the rotor with pullers and other tools/ tackles. Providing and fitting of new bearing set i.e. bearing no 6040 C3 at DE and 7322 X 2 no,s at NDE sides and then greasing them properly. Re-assembling the motor after repairs. The job further involves cleaning the complete rotor by removing the dirt deposits from rotor by cleaning them thoroughly by using high pressure blower & then with CRC-226 compound thoroughly and varnishing with varnish by using air pump gun. Assembling of all the dismantled components of motor such as rotor, stator, top cover & bottom cover with replacement of damaged worn out nuts/bolts. The job also includes replacement of damaged/worn-out carbon brushes, brush holders and copper cables etc from slip ring assembly and then renovation of slipring surface by way of cleaning, brushing and removing the carbon deposits & pits with the help of wire brush and sand paper. Rebuilding of copper linings & finishing for smooth surface and then providing and fitting of new carbon brushes-18 no’s and brush holders -12 no’s. in place of old damaged one. Providing/fitting of 5 meter new 185 sq. mm copper cables for slip ring as per existing sample, size & specification. Taking IR value after drying out varnish by making temporary temperature drying up process and is to be continued till required IR value is achieved. The job involves Re-installation of motor on motor stool and coupling it with V.T pump, making of electrical connections and testing of motor on no load and then coupling of motor with VT pump set and then testing of motor on full load. The job also involves painting of motor and motor stool by way of removing all dust/oil deposit, cleaning of surface and then applying one coat of metal primer followed by two coats of superior quality paint. The job also includes the cost of material, skilled/unskilled labour charges, hire charges of tools and tackles required for execution of work at site, to and fro carriage charges etc. Complete job

M/S RAGHUNATH MECHANICAL AND ELECTRICAL ENGINEERING WORKS

NATIONAL ELECTRO-MECH COMPANY

GS ENGG WORKS