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

Dismantling of complete Gear Box unit along with 50 HP Vertical induction Motor from its installed position after disconnection of cable etc. with the help of lowering /lifting tool and tackles and removing the damaged nut bolts.

Removing of all the parts of aerator i.e. Gear box, propeller shaft, input coupling, foundation Etc. with the help of lowering/Lifting tool and tackles.

Stacking of all above dismantled equipment at one place with the help of lowering/ lifting tools & tackles, loading the elements in road conveyance with the help of Heavy labour.

Safety arrangements as per NHRC guidelines for execution of work safely.

Providing of High Tensile Harden foundation bolt size 25 mm dia. x 450 mm long with 4 Nos. nuts & washers etc.

Fabrication/Supply of coupling protector as per sample in terms of shape, size, machining and metallurgy i.e. cast iron in terms of existing shape and size complete in all respect including machining job as required.

Fabrication of Input coupling with locking plate, fabricated by M.S /C.I as per sample in terms of existing shape and size complete in all respect including machining job as required.

Providing of M.S. nuts & Bolts of different sizes as per site requirement.

Providing of Rotating Parts for Fixed Slow Speed Surface Aerators having gear ratio 31.4:1 to Suit 37 KW, 1500 RPM, 415 Volt, 50 Hz Vertical Induction Motor at12MGD, STP Okhla. Propeller fan fabricated as per sample in terms of shape, size, machining and metallurgy i.e. Mild Steel to deliver at least 1.1 Kg oxygen per KW along with set of male & female flanges. The propeller will be statically and dynamically balanced duly coated with anticorrosive paint after sand blasting.

Hollow propeller shaft made out of En-9 having outer/ inner dia. and length as per sample with proper machining and finishing. The hollow shaft will be complete in all respect and in ready to use condition having provision for fitting male & female couplings. The hollow shaft will have two coats of anticorrosive paint.

Base frame fabricated by M.S. channel as per sample in terms of existing shape & size suitable for Triple Reduction Vertical Parallel Mechanical Gear box model VH3-M-225 complete in all respect.

Laying of one number PVC insulated and PVC sheathed / XLPE power cable of 1.1 KV grade of following size direct in ground including excavation, sand cushioning, protective covering and refilling the trench etc. as required. Above 35 sq. mm and up-to 95 sq. mm. (Cable will be provided by the department)

Laying of one number PVC insulated and PVC sheathed/ XLPE power cable of 1.1 KV grade of following size in the existing RCC/ HUME/ METAL pipe as required. Above 35 sq. mm and up-to 95 sq. mm.

Supplying and making end termination with brass compression gland and aluminium lugs for following size of PVC insulated and PVC sheathed / XLPE aluminium conductor cable of 1.1 KV grade as required. 3½ X 95 sq. mm DSR 7.1.24

Supply and fixing of 6 hole pin bush coupling to couple the motor with gearbox. The work also include the boring of coupling, key, key way as per the site requirement.

Replacement/Installation of propeller fan and allied items on aeration units after completing all required repairing/assembling of propeller and hollow shaft in aeration chamber with the help of required mechanical equipment men power and crane and make it fully functional after assembling all units and parts including propeller and hollow shaft, gear box, motor, base frame and electrical connections. Supply of N/B/W as required for the job (i/c old Propeller, Hollow Shaft & Half Rigid coupling etc. will be deposited in the store of concerned engineer.) Arrangement of all required safety equipment (i.e. safety belts, folding ladders, safety helmets, safety shoes etc.) for the safety of manpower during execution of work. The work is to be carried out in 20 feet deep tank.

Re-installation of the complete gear box unit, motor, propeller & propeller shaft with the base frame after fixing/ grouting foundation bolt in RCC slab i/c cutting suitable size holes with power drill and pouring suitable strength Cement concrete mortar with the help of chain pulley block, man power, tools & tackles as required at site.

Painting of aerator with two or more coats of super enamel paint as per color shade of engineer-in-charge.

Supply and fixing of LT rubber insulation sheet 1x1.5 mtr. of suitable thickness on aeration no. 2 & 19.

Cartage to & fro from site to workshop. The job includes hiring of heavy labour for loading & unloading.

Testing & Commissioning of the Aerators and No Load and full Load.

M/S ARYAN TRADERS AND ENGINEERS