Tender For supply of orifice cast flange as per drg. no. ng-14836 (r-1) , orifice cast flange as per drg. no. ng-14837 (r-1) , orifice cast flange as per drg. no. ng-14838 (r-1) , orifice cast flange as per drg. no. ng-14839 (r-1) , orifice cast flange as per drg. no. ng-14840 (r-1)