MTPS I CA CWS I Cooling Tower II Overhauling of Flow Control Valves including reconditioning of worn out spares during AOH 2021 2022 of Unit II

Amount

Charges for reconditioning of worn-out Flow Control Valve (FCV) spares released from Cooling Tower –II at outside workshop, boring of worn-out GI Disc, fabrication and assembling of M.S. flange on CI Disc, molding of new CI guide bush, boring and thread cutting on the inner surface of the bush to suit with the existing S.S. Stem. Reconditioning of worn-out S.S. Stem by thread cleaning and provide S.S. stem end nut and two Nos plate washers per stem, including the transporting charges ( Cost of materials M.S. flange for CI disc, CI guide bush, S.S. stem end lock nut and plate washers and machining charges are on contractor scope)

Charges for removing the existing damaged Nitril rubber from the M.S. Flange Cooling tower-I, Cleaning and sand blasting on both the surface for Nitril rubber impregnation, moulding the Nitril rubber over the flange for 5 mm thick on each side (the size of the flange to be impregnated is OD-640 mm; ID-450 mm) trimming and steam vulcanizing , including the cost of Nitril rubber, adhesive and also charges including transporting charges of worn-out spares from MTPS-I to outside work shop and return back to MTPS-I.

Charges for dismantling of inspection doors provided at Flow Control Valve assembly casing. Dismantling of Flow Control valve assembly (about300 kg weight) from taping pipe flange of hot water header line. Reassembling the same by using Rubber gasket properly without water leakage. Open/close operation checking works.(Cooling towers of Paharpur make Model 1514-11 )

Charges for Dismantling of Flow control valve spares from Flow Control Valve assembly, cleaning, inspection and renewal of worn-out spares like guide bush, stem, CI disc, lock nut, locking bar and operating handle etc. and reassembling the Flow Control Valve assembly (Cooling towers of Paharpur make Model 1514-11

Charges for removing the rust and old paint from the Flow control valve casing.

Painting charges for two coats of enamel light / smoke grey, black, green paint including cleaning the surface[Required all paints Asian/ Berger make, first quality paint on, Epoxy sea Green / gray - 8 Liter, Epoxy red oxide primer-5 liter , Epoxy Thinner – 2 liter, including cost of paints contractor scope)

Charges for reconditioning Flow control valve casing for fixing inspection doors by drilling and removal of existing 8 Nos. of eroded M10 / M12 stud, making 8 Nos of new M 10 /M12 thread on the valve body by using tap set in Cooling Tower –II(Material M10 / M12 stud supplied by the TANGEDCO)

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

Charges for dismantling the GI casing of FC valve to facilitate the OH of FCV & renewal of nozzles etc., and assembling back after completion of work in CT-II .

Charges for Cleaning, painting with one coat of epoxy red oxide primer and one coat of epoxy high build coal tar one over the other with proper intervals in Stop log gate. [Required of all paints Asian/ Berger make, first quality paint on Red oxide primer 0.11 lit - 5 Liter, Epoxy High built Coal tar -9 liter, Epoxy Thinner – 2 liter, including cost of paints contractor scope).

Charges for Material cost