NIT No-23 EE (SDW) II/ (22-23) Item No. 17

Providing/ Fixing of motor covers and other accessories to the motors installed at aeration unit of 37MGD STP Okhla by carrying out following works including all the required works, materials, arrangements tools & tackles workmanship, safety arrangements & equipments as per NHRC guidelines etc. and as per site requirement, re-modelling all the damages up to standard if occurred any complete in all respect satisfactorily. The job is also including that job/item also which are necessary to make the equipments/site operational but not taken into the estimate. Dismantling the 50HP vertical induction motor from the gearbox after disconnecting the power supply from main control panel with the help of lowering /lifting tool and tackles. Removing the damaged pin bush coupling from the motor shaft as well as from gearbox and placing the 50HP vertical induction motor to a safe place at the aeration chamber after covering the motor with PVC flexible sheet cover to avoid the entry of moisture into the motor.

Switch off the power supply of motor from the main control panel one by one as per instructions of engineer-in-charge. Dismantling the damaged/ rusted motor covers, damaged plastic fans and removing the damaged nut bolts help up in motor by spanner, wrench, cutter, drilling etc and making of holes and taping to accommodate new nut-bolts accordingly.

Switch off the power supply of motor from the main control panel one by one as per instructions of engineer-in-charge and removing the damaged nut bolts help up in motor by spanner, wrench, cutter, drilling etc and making of holes and taping to accommodate new nut-bolts accordingly.

Dismantling of existing damaged connection plates from motors by disconnecting the cables with proper safety and by duly removing the nut bolts by spanner, wrench, and cutter, drilling etc and making of holes and taping to accommodate new nut-bolts accordingly.

Proving/fixing of flexible plastic motor cooling fans of suitable size as per motor shaft with key to lock the fan as per 50HP 3phase motor having 1470RPM.

Providing/Fixing of new motor fan cover made of MS sheet of suitable size duly holed as per motor tapped holes and having 6 holes of 2inch dia on top of the motor for air circulation with a second MS sheet/canopy of suitable size at a gap of 3inch duly welded with four nos. MS flat in order to avoid the rain water entry into the motor top and painting the same with putting one coat of epoxy primer and two coats of epoxy paint of phirozi colour.

Providing/Fixing of new connection box with cover plate made of CI/MS sheet (6mm) duly holed as per motor tapped holes suitable for 50 HP Vertical Aeration Motors and painting the same with putting one coat of epoxy primer and two coats of epoxy paint of phirozi colour.

Providing/fixing of new connection/ terminal plates of insulating material as per sample for 50 HP Vertical Aeration Motors. Making connection of dismantled cables with proper nut-bolts and taping as required.

Providing/Fixing of new hooks to lift motors made of CI suitable for 50 HP Vertical Aeration Motors as per sample and painting the same with putting one coat of epoxy primer and two coats of epoxy paint of phirozi colour.

Providing/fixing of new 6 pin bush coupling (complete in all respect) suitable for couple the 50HP 1470rpm induction motor with VH3M225, 31.4/1 ratio gearbox as per sample and bore as per dia of the shafts of motor and gearbox with coupling key. Make: Unique/Fenner or DJB approved make.

Fixing the 50HP vertical induction motor with the concerned gearbox at site and put the same in working order after fixing the nut bolts etc. & making of electric connection.

Testing the motors one by one after switch ON the power supply from the main control panel on full load for :- Checking all for phase to phase, neutral to body, neutral to earth and phase to earth Functional Test Installed accessories vibration test.

N.R. Enterprises