ttps mech.ii bm - unit i and iii - removal of ash accumulated over the mechanical dust collector path a,b,c and d and id fan a and b suction side ducts and welding the eroded weld joints in the mechanical dust collector path a, b, c and d and suction side duct of id fan aandb, cleaning the ash deposited below the pa, fd and id fans and in airpreheater guide bearing area and overhauling of air and flue gas dampers and actuators in unit-i and iii aandb pass during overhauling for the year 2021 2022 note: prospective bidders may get the specification free of cost by down loading from tangedco website .