NIT No-14 EE (SDW) II/ (22-23) Item No. 06

Repairing/Strengthening of Final Settling Tank (FST) at 12 MGD STP Okhla by carrying out the following works:- Isolating the clarifier from upper and down streams of its flow and dewatering the water from the FST with the help of submersible, clean the site manually for execution the work including providing of gunny bags if required.

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

Making temporary platform around the central post of FST for safe working of staff on central cage as per requirement.

Dismantling/Cutting of all worn out structure i/c scrapper, scrapper arms, bridge, chequered sheet, damaged central drum, angle iron structure and nut-bolts/rivets with the help of gas cutter, manpower and lowering lifting, tools & tackles as per requirement.

Dismantling the motor and primary gear box, central gear box and other mechanical fixtures from the top of central mechanism with the help of gas cutter/tools & tackles and shifting the same to workable place.

Repairing/Overhauling of the primary reduction gear box fixed on the top and central mechanism i/c replacement of damaged spares of the gear box and central mechanism, the job also include replacement of bearings (roller/ball) & gear oil etc. for the same. Make of Bearings: - DJB approve make.

Strengthening of rotating structure by providing/fixing damaged M.S. Angle size 50x50x6mm, 65x65x8mm, 75x75x8mm and 230x130x8mm M.S. sheet for joints as per sample in terms of shape, size & MOC.

Proving/Fixing the M.S. chequerred sheet of size 0.910x26 mtr and 8mm thick for walk way.

Proving/Fixing the bottom scrappers made out from 6mm thick sheet as per sample in terms of shape, size and metallurgy.

Providing/Fixing of rubber squeeze of 100% synthetic rubber. Make:- Jyoti/National

Providing/Fixing of damaged M.S. Sheet having thickness 6mm 15 sqm approx. and MS angle 50x50x8mm 30 Mtr approx. for central drum with workmanship charges.

Repairing of damaged vertical structure of central drum, M.S. angle iron of size 150x150x8mm and 75x75x8mm by welding & providing nut bolt etc as per requirement at site.

Strengthening of bridge structure by providing/Fixing of MS angle of size 75x75x8 mm, 65x65x8 mm, MS channel of size 100x50 or suitable size.

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

Assembly and alignment of complete and fixing the above material i/c all nut bolts and fasteners as per requirement.

Providing/Fixing the v-notch of the FST made out from I.S.O. resin 5mm thick i/c cutting the notch as per sample and fixing the same with fasteners as per sample.

Painting the complete structure by carrying out following works:- Providing the metal primer red oxide (in 20 Ltrs. Packing)

Providing the synthetic enamel black paint (in 20 Ltrs. Packing) Make:- Asian/Nerolec/Berger

Providing the synthetic enamel paint Tractor Orange (in 20 Ltrs. Packing) Make:- Asian/Nerolec/Berger

Providing of thinner (General propose) for diluting the paint (in 20 Ltrs. Packing)

Painting the complete structure with one coat of epoxy primer and two coat of enamelled paint.

Testing & Commissioning the complete FST including filling of lubricating oil approx. 160 ltrs. (shall be given by the department) after completion in all respect on No Load/Full Load.

MITTAL TRADING COMPANY