MTPS I CA CWS II De-watering complete cleaning and sludge removal cleaning with bleaching powder painting the structure of clarifier IV and O/H of Sludge disposal pump during AOH 2020 21

Amount

Charges for de-watering of clarifier, mixing the mud / fine sludge deposits with water while de-watering in clarifier of size 18 M radius x 6.5 M depth

Charges for removing sludge and other foreign particles from the clarifier of size 18 M x 6.5 M depth

Charges for cleaning the algae deposits on the side walls of both inner and outer rings of clarifier and bottom surface with coir/wire brush. Applying and cleaning with bleaching powder on both side walls of inner ring & outer rings and also at bottom surface in clarifier – IV including Bleaching powder, ( Bleaching powder under contractor scope )

Charges for de-watering of sludge disposal pit, removal of sludge from sludge disposal pit, and also tunnel pipes from clarifier to sludge pit. Cleaning of algae deposits with coir / wire brush, and applying & cleaning with bleaching powder on inside walls of sludge pit, flash mixing chamber.(Bleaching powder under contractor scope )

Charges for removing the rust and old paint from the structure immersed in the water and above the water level exposed to atmosphere , RW line, inlet and outlet and tunnel vent valves exposed to atmosphere of clarifier – IV

Charges for painting with one coat of rust convertor (Impodex / Impodor), one coat of epoxy red oxide primer and one coat of epoxy high build coal tar one over the other with proper intervals for clarifier structures immersed in the water and above the water level exposed to atmosphere and structure frame inside flash mixing chamber of unit – IV and RW line , inlet and out let valves and tunnel vent valves. (Required quantities of Rust convertor, Epoxy red oxide primer, Epoxy high built coal tar/Sea green, thinner etc are of contractor scope) .

Charges for painting with one coat of rust convertor (Impodex / Impodor), one coat of epoxy red oxide primer and one coat of epoxy high build coal tar one over the other with proper intervals for clarifier inner and outer ring fabricated sun shield roof structures and man hole door frames. (Required quantities of Rust convertor, Epoxy red oxide primer, Epoxy high built coal tar, thinner etc are of contractor scope)

Charges for dismantling and reassembling of roofing the G.I. corrugated sheet over the fabricated M.S. structural truss including cost of materials such as G.I. J – bolt & nut, cup washer of size 150 mm length with bituminous washer

Overhauling of 200 /150 mm size NRV & Gate valve of sludge disposal pump and Gate valves of cold & Hot water Tunnel Vent in Cooling Water system including dismantling of vent pipe , complete dismantling the valve, Lapping the valve disc & seat area , renewal of spares , Gland Packing and rubber gasket and assembling including cost of consumables and charges for T&Ps Etc. (Cost of gasket and gland packing are to be borne by the contractor.

Charges for overhauling of Sludge disposal pump includes dismantling of pump components, cleaning, inspection and renewal of worn-out parts and reassembling.

Complete alignment & checking the operation of clarifier sludge disposal pumps motor, sludge disposal pumps and its suction & delivery pipe lines and its150 mm gate valves

Charges for cutting and removal of existing deteriorated bolts of scrappers, removing damaged scrapers, cutting of scrapper rubber to required dimension from old conveyor Belt, marking and making holes on scrapper rubber and fixing with new G.I Bolts and nuts in the traction drive in clarifier-IV[G.I. hex bolts of size M 12 x 70 mm (104 Nos.) with nuts and 2 Nos. plain washers/clarifier are on contractor scope

Charges for complete cleaning rust with wire brush, applying one coat of rust remover, again cleaning the rust, applying one coat of epoxy red oxide primer and one coat of epoxy high built coal tar one over the other for the immersed pump components.[Cost of Rust remover, epoxy red oxide primer and high built coal tar are under contractor’s scope and Painting quantity Rust remover-34 Litre, Epoxy red oxide primer-37 Litre, Epoxy high built coal tar-64 Litre and Epoxy Thinner -15Litre are under contractor’s scope ].

Charges for leading, lifting, positioning and inserting the stop log gate in the cold water Outlet canal of CT-IV to facilitate the cold water dewatering work. After completion of dewatering work removing , leading and placing the stop log gate on the floor during AOH of the Unit –IV

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