NIT No-25 EE (SDW) II/ (19-20) Item No. 3

Repairing/Strengthening of 8 MGD Capacity primary Settling Tank No. 1, STP Okhla, by carrying out the works as under: - Isolating the PST from inflowing and out flowing channel by closing sluice gate and providing gunny bags to ensure no flow in the PST. Dewatering the stagnant water from the PST with the help of submersible pump and D.G. set. Cleaning the site manually for execution the work.

Dismantling of motor, Primary gear box and other mechanical fixtures from the top of centre mechanism and shifting to workable safe place.

Dismantling all the gears in turn table after removing the Broken bearings form the gears and wheels

Making temporary platform in the PST around the central post as per site requirement.

Dismantling of drive head by cutting nut & bolts with the help of gas cutter and dismantling the shaft & complete transmission unit.

Dismantling the all worn out angle iron, scrappers, and damaged portion of the drum by cutting nut & bolt with the help of Gas cutter, man power, and labour as per site requirement / strategy.

Providing a set of sleeve fabricated as per sample in terms of shape and size

Overhauling of reduction gear on the side by repairing and replace the wheel, gears/Broken Bearings of turn table and oil seals as per required size on the site.

Providing of set of scrapper arms comprising of arms, made out of M.S. angle iron size 65 x 65 x 8mm, 20mtrs., 75x75x8mm, 30mtrs. 50x50x6mm, 21mtrs. aprx. and Vertical channel size 150x70x6mm, 8 mtrs. Appx. of main arm as per sample and manufacturers standard.

Repairing of damaged vertical structure of central drum, M.S. angle iron of size 150x150xx8mm (Approx. 10Mtr) and 70x70x8mm (Approx. 25mtr). By welding & providing nut bolt etc as per requirement at site.

Repairing of centre drum by patch work using 5mm thick M.S. sheets and homogenous electric and welding i/c replacement of the damaged stiffeners of the drum with the help of electric welding by providing of size 50x8mm M.S. flat as per site requirement. The job also includes replacement of the damaged portion of the drum and restringing with 50x50X8mm angle iron fixed on the top and bottom of the drum with the help of electric welding.

Providing of SS Tie Rod of size 5/8” dia x length 5 Mtrs. Apprx.

Replacement of MS chequered sheet, 6mm thick , 900 mm wide in a length of 22 Mtr. Approx. by cutting of old rusted/ demanded sheet & fixing of new sheet with welding work

Fixing of above Tie Rod at both side of central drum for holding the scrapper arms with adjustment assembly.

Alignment of the complete structure after assembling fixing the above material with the provision of weight to align the same.

Painting: - Providing of Red Oxide Metal primer Black Enamelled. Painting the complete structure after removing the rust with the wire brush and putting one coat of epoxy primer and two coats of epoxy paint etc. Make: - Asian/Nerloc/Burger.

Replace of Gear Oil. Servo-40 in the central mechanism as well in reduction gear boxes.

Testing and commissioning of complete PST with all auxiliary material as lowering/ lifting tools and tackles.

paramount systems