overhauling of windbox, sadc and coal pipe of 883 xrp bowl mill of unit-4, bktpp during unit overhauling - coal burner, nox, sadc & wind box oh 2 coal/oil burner oh 3 burner isolating gate oh 4 sadc with windbox and nox system oh 5 coal pipe oh work 6 removal of mill o/l 7 replacement of feeder chute-ii 8 replacement of mpo/mdv 9 replacement of the orifices of coal pipe 10 replacement of fuel inlete lbow, offset 11 servicing of rock well coupling 12 replacement of ms straight coal pipe 13 replacement of ss drop pipe 14 hanger support servicing 15 gst as applicable will be paid extra on production of proper documents