NIT No-15 EE (SDW) II/ (20-21) Item No. 19

Renovation of Primary Settling Tank No.2 (A unit of 37 MGD) STP, Okhla by carrying out following works:- Isolating the PST by operating Sluice Gate and providing gunny bags to ensure no flow in the PST. Dewatering the PST with the help of sump pumps and D.G. Set. Cleaning the PST with the help of machines/manually for execution of work

Dismantling of electric motor, primary gear box and other mechanical accessories from the top of center mechanism and shifting to workable place.

Making temporary platform as safety measures on the sides of the centeral cage as per site requirement for dismantling of drive head

Dismantling of Central cage & turn table, lifting & taking out from the PST & shifting to ground level etc.

Dismantling the damaged structure of the both side scrapper arm structure and shifting the same to a workable place with the help of mobile crane & heavy labour etc.

Renovation of Centre drum i/c replacement of the damaged stiffeners of the drum and making required patch work with 5 mm thick M.S. sheet 10 sq meterwith the help of electric welding as per site requirement.

Renovation of the reduction gear box fixed on the top i/c replacement of damaged spares of the gear box, the job also include replacement of bearings (7306, 7204 & 32216= 2 Nos. Each) & gear oil etc. for the same. Make of Bearings: - SKF/FAG

Renovation and strengthening of scrapper arms structure by way of Providing/ Fixing new elements of the structure made out of MS Angle Iron of size 65x65x6mm Approx 50 meter & 50x50x6mm approx 80 meter by using new fasteners and homogenous electric Arc wending and balancing the both side Arm with the help of Tie Rod and with adjustment bolts.

Replacement/Renovation of the bottom scrapper made out from 8mm thick MS sheet of size 200x1700 mm approx. i/c replacement of the rubber squeezers with MS flat after making holes at equal distance and fastening through the nut bolts.

Replacement of turn table balls of size 38mm approx.

Replacement of strip liner of High quality spring steel of centre mechanism

Providing the S.S nut bolts as per sample for fixing the ‘V’ notch.

Fixing the nut bolts the V-notch in PST after drilling in RCC with power hammer including all civil work with all tools and tackles.

Fabrication the scum box (Size 1800x1500mm approx) made out of 6mm thick M.S. sheet i/c providing the heavy duty out let pipe of 200mm dia and 8mm thick, including flange with nut bolts & gasket. Fixing the box at site with the help of angle/channel after alignment the scum box with the help of all tools and tackles and loading, unloading arrangements.

Dismantling of 2 HP 415 Volt 3 PH 960 RPM crompton Greaves make Induction Motor. The work includes replacement of stator Leads, varnishing, baking with Dr. Back Varnish, replacement of connection plate & box. Assembling the complete motor & put on the foundation tightening of the same i/c replacement of New Tyre Coupling.

Replacement of MS chequered sheet, 8mm thick, 0.950 mtr. wide in a length of 22 Mtr. Approx. by cutting of old rusted/ corroded sheet & fixing of new sheet with welding work

Painting of the complete structure after removing the rust from the structure with the wire brush. Painting the surface with the one coat of red oxide primer and two coat of anti corrosive paint.

Assembling, Testing & Commissioning of complete unit on No Load/Full Load after removing gunny bags and temporary plate form.

V.K. ENTERPRISES

Darshan Engineering Works