NCTPS_II_UII_Spec_107_BM

Marking of defective tubes identified, during tube thickness survey, transportation, of T&P’s gas and consumables, cutting of defective portion of tubes edge preparation, welding of new spool piece with IBR welder and assisting for hydraulic test. Charges inclusive of consumables, argon gas and T&P's.

Replacing of Oxide scale deposited tubes /bends by new bends/ tubes :Cutting and removing of Oxide scale deposited front re-reheater tubes / bends by arc cutting by using special electrodes for a affected length portion from the coil assembly, edge preparation of tube ends , Positioning and new tubes/ bends by tag welding.Welding the tube joint with IBR welder.(argon gas, welding generator, TIG set and special welding electrodes will be the scope of contractor.) Charges inclusive of cost of consumables and T&Ps.

Erosion filling: This work involves filling up of eroded portion of tubes by arc welding with IBR welder up to 100 mm length. It involves, cleaning the surface of the eroded tubes and filling with IBR welder. Charges inclusive of T&P’s and Consumables such as grinding wheels, emery sheets, gada cloth etc.,

FIN/SEAL WELDING BY IBR WELDER Fabrication, grinding, welding with arrangement of scaffolding for welding of fin / seal plates in the boiler inter pass steam cooled wall and other areas of boiler to arrest the ash leakage/air ingression wherever required. Charges inclusive of cost of T&P’S and consumables(fin welding to be done by IBR welder)

Strengthening of existing joints: Charges for identification of less eroded existing joints in the steam cooled wall and economizer area transportation of tools and plants and consumables, grinding less eroded joints and strengthening the joints by welding with IBR welder.

This work involves removing the existing damaged cassette baffle plate by leading, lifting from its position and fixing the cassette baffle plate / end shield old/new in the existing Eco.coil assembly inside the boiler and devolute the scrap materials to the store after completion of work.

Charges for fixing shrouding at erosion prone Boiler tubes & bends by Tag welding.

Providing special type platform to access the rear re-heater coils for the entire re heater bottom area and back pass screen tube area for facilating Oxide scale thickness measurement and renewal of oxide scale formed tubes. The charges for transportation of scaffolding materials and consumables to the boiler rear arch slope area, erecting at 64mtrs height for a width of 3 mtrs, scaffolding and temporary platform for facilitating attending the above work. After completion work, removing the scaffolding and temporary platform from the area and shifting back the scaffolding materials. Charges inclusive of T&P's and consumables.

Fabrication charges for making bends in screen tubes / LTSH tubes / Economizer tubes: charges for marking, cutting , sizing and bending the tube to the required size and shape including cost of consumable and T&P's