NIVALI-WBS...M and R to Nivali WSS.... Repairs and Strengthening of CLF Bridge, Replacement of Flash Mixer along with allied works at WTP Nivali.

Dismantling complete old CLF Bridge walkway assembly, inner suspender assembly, outer suspender assembly, flocculator assembly, traction drive assembly and all other sub-assemblies on temporary support and removing old worn out, corroded rusty parts and stacking the scrap with in a lead of 100 mtrs.

Repairs to mechanical flocculator drive assembly by replacement of faulty gear box,faulty electric motor, G.I. base frame. Replacement of corroded worn out MS Paddles ,shaft, paddle arms by new G.I. MS parts of higher sections and retaining existing paddle geometry and strength. All the new steel parts shall be sand blasted, and painted with epoxy paint/ galvanized etc. complete

Repairs to traction drive assembly : -All MS parts such as base frame, trolley assembly :- New end carriage assembly consisting of a sturdy G.I. trolley with required degree or curvature suitable for smooth circular motion of the bridge walkway and a independent drive assembly consisting of worm gear reducer of adequate size and capacity driven by a three phase electric motor of adequate rating and power, interconnected by C.I. couplings and finally transmitting motion to traction wheels via chain sprocket assembly. The drive assembly shall be mounted on a sturdy base frame fabricated from ISMC 100 x 50.The traction assembly shall have 2 polyurethane coated wheels, the shaft of the wheels shall be provided with self align bearings housed in cast iron pedestal housing. The drive assembly shall also be provided with suitable chain drive to derive necessary speed. (all M.S. parts such as base frame ,trolley assembly shall be painted / galvanized etc. complete.

Repairs to central bearing assembly and central turn table : -This item includes supply of new central bearing assembly consisting of imported thrust bearing having adequate vertical load carrying capacity of not less than 2.5 ton to carry the vertical load of the equipment and two radial ball bearings to counter the radial load of the walkway. The bearings are housed in a bearing housing fabricated from high grade seamless pipes specially used for manufacturing heavy duty bearings and high carbon steel plate having high shear strength properties. The fabricated housing is machine on high precision lathe machine and cylindrical grinding machine to close tolerances required for press fit of N9 grade. The housing along with the outer race of radial ball bearing shall rotate where as the inner race of the bearing shall be press fit on a spindle with plate .The spindle with plate is fabricate from high carbon high chromium steel machined on high high precision lathe machine and cylindrical grinding machine to close tolerances to achieve n-9 finish. The bearing assembly is also provided with hinge pin joint to cope the misalignment caused due to level difference if any between the traction path and central shaft top. The central bearing assembly is welded to a base plate or a foundation plate which is firmly anchored to the central column. The bridge walkway is supported on the bearing assembly via a sturdy central support frame fabricated from MS channel and angle. The central support frame / turn table and all other steel parts shall be epoxy painted/ galvanized etc. complete

Repairs and strengthening of bridge Walkway : - Replacing all the corroded and worn out parts by new m. s. parts with G.I. coating and bolted by G.I. hardware the bridge walkway shall be designed for self load, flocculator load, the suspender load and live load confirming to IS. The walkway shall have a width not less then 1.00 Mtr and shall cover full diameter of flocculator on both sides of the central shaft and extend up to the outside diameter of the clarifier tank. The walkway shall accommodate two numbers paddle type flocculator assemblies suitably located on either side of the central column. The walkway bridge shall be supported on two supports only , one at the centre of the tank on the central brg. Assembly at the centre of the tank and the other on the traction trolley on the launder beam. The walkway shall have G.I. railing of 1 mtr. Height on both the sides along its total length. The walkway shall be covered with chequered plate. The entire structure shall be sand blasted, pickled and then epoxy painted/galvanized etc. complete.

Repairs to inner suspender assembly in flocculator tank : -Providing ,erecting and commissioning new inner suspender assembly consisting of framed structure fabricated from m. s. structural steel such as angles and channels of adequate size and section, The entire shall be sand blasted, pickled and then epoxy Painted/ galvanized including bottom scrapers 6 Nos etc. complete.

Repairs to outer suspender assembly in clarifier tank :-Providing, erecting and commissioning new outer suspender assembly consisting of framed structure fabricated from m. s. structural steel such as angles and channels of adequate size and section. The entire structure shall sand blasted, pickled and then epoxy Painted/ galvanized including bottom scrapers 9 Nos. etc. complete.

Electrical control panel : Replacing worn out and faulty parts such as contactors, starters, other electric parts by new parts. Replacing the old cubical panel by new cubical panel fabricated from 16 SWG C.R. Sheet with powder coating. All the parts in the panel shall be interconnected by copper wire. This item also includes replacing the old faulty slip ring assembly by new slip ring assembly.

Providing, erecting and commissioning of turbine type flash mixing assembly suitable for 24 MLD. Water treatment plant including stainless steel shaft Electric motor, couplings, electric control panel etc. confirming to CPHEOO manual and relevant Indian standards. etc. complete.