supply of gi, non return valve, rubber insertion required for maintanance of different rli scheme within purulia-i (a-m) sub-division under purulia (a-m) division under np/mtn programme 2022-23 , 90 degree m.s. long priming bend 150 mm nominal dia. (both end flanged), m.s. erw pipe conforming to is: 1239 (part-i)/2004, 4.8 mm thickness medium class, isi marked,bend shall be as per is: 1239 (part-ii)/2011 and flange conforming to is: 6392/1971isi marked with raised surface (table-17). galvanized , 150mm dia, 2 mm thickness,45mm width m.s. (galvanized) heavy duty hose clamp fitted with m.s. bolt & nuts. , 150 mm nb swing check type reflux (non-return) (single door) valve. as per is-5312 and duly isi marked. pn 1.0 , rubber insertion 5mm thick with proper reinforcement 2 ply conforming to i.s.638/79 with latest amendmentssuitable for m.s.flange as per i.s.6392/71 with standard drilled holes.(table17)