NIT No-16 EE (SDW) II/ (21-22) Item No.10

Renovation of Secondary Clarifier No. 2 having capacity 8 MGD at 16 MGD, STP, Okhla by carrying out the following works: - Isolating the Secondary Clarifier by closing sluice gate and providing gunny bags to ensure no flow in the FST. Dewatering the stagnant water and cleaning the FST with the help of submersible pumps and D.G. sets De-Sludging and cleaning the F.S.T. manually for execution the work.

Dismantling of central primary gear drive unit after disconnection from main electric supply. Taking out motor after mechanical dismantling of sprocket chain. Removing of gear box from the base and shifting equipments in safe place.

Making temporary plate form as safety measures on the sides of the central cage as per site requirement of drive head.

Dismantling of main gear driving unit after cutting rusted fasteners by gas welding set. Dismantling of internal gear heavy unit of turn table, other gears and pinion, dismantling of bearing. Taking out vertical shaft. This includes lifting arrangement by mechanical means.

Providing/fixing of sitting arrangement near reduction gear box for safety purpose with M.s angle 40x40x6 mm length approx 10 meter and M.S sheet of 5 mm approx 5 meter and M.S pipe 40mm dia. Approx 12 meter for safety arrangement.

Renovation/ Strengthening of Scrappers arms and scrappers, by carrying out following works:- Dismantling of rusted/corroded bottom scrappers along with arms with the help of Gas Cutter, all tools & tackles.

Providing of M.S. Angle Iron of sizes 90mm x 90mm x 10mm and in a length of 7’ fit for scrappers Arms.

Fab./Providing of Bottom Scrappers by 5 mm M.S Sheet of sizes appx. 2700 x 200 x 8 mm along with Rubber Squeezers & M.S. Flat.

Providing of M.S Nut Bolts of different sizes

Providing the 4 Nos. tie rod with support on both side of central drum for holding & balancing the scrappers arms with adjustment assembly

Labour charges for fixing the above M.S Angle Iron for scrapper Arms, Bottom scrappers along with squeezers i/c making hole for tightening of Nut Bolts i/c all welding & cutting work.

Renovation of M.S Central Drum by carrying out following works: - Cutting of worn out/ portion of Central Drum.

Providing of M.S Sheet having thickness 5 mm for Central Drum.

Fixing of above M.S. Sheet of Central Drum at different places with the help of Electric Arc welding i/c the work of cutting, bending/ shaping of sheet as per site requirement.

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

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

Cutting of worn out/ corroded M.S. sheet of walkway with the help of gas cutter, all tools & tackle.

Providing of M.S chequered sheet having 8 mm thick

Fixing of above M.S. chequered sheet on the walkway bridge by cutting welding with required size.

Providing of Lubricating oil 320. Make: - Servo.

Painting of the complete structure by carrying out following works: - Providing of Red oxide metal primer in 20 kg packing. Make: - Asian/Nerolec/Burger.

Providing of synthetic Enamel paint in Black/Red Colour in 20 Ltrs. Make: - Asian/Nerolec/Burger

Painting of the complete structure after removing of rust with brush with one coat of primer & two coat of enamel paint i/c petty items.

Testing and commissioning the complete FST after completion in all respect on no load / full load.

Darshan Engineering Works