procurement of bag filters and cages for esp at unit no . 1 and 2 of 2x600mw sstpp , mppgcl , dongalia , bag filters for buffer hopper material of construction- nomex-550 gm / mt sq . , aramid fibre , size- 160 x 2000 mm , fibre composition- polyaramide , weight-550 gm / mt sq . , density-0 . 29 gm / mt cube , air permeability-150l / d mtsq / min , wrap strength , - 800 n / 5x20 cm , weft strenfth- 1000 n / n 5x20 cm , wrap tensile elongation-35 % , weft tensile elongation-45 % , working temperature-204 deg centigrade , short working temperature- 250 deg centigrade , anti acid- good anti alkali- excellent , surface treatment- singeing , calandering and heat setting . , cages with venturi for bag filters material : ss304 size 145mm ( inner dia ) x1980mm ( long ) ring wire thickness:3 . 5mm no . of vertical wires :12 nos . no . of horizontal wires: 13 nos .