tender for rate contract for supply of set of top & middle flange for 24 months from approval at bhel, bhopal. , rate contract for supply of set of top & middle flange for 24 months from approval at bhel, bhopal. evaluation shall be doen packagewise. splitting as per nit applicable. , fully machined unplated top flange (pvn 36) to drg no. 25217001503-001 rev.25. (casting drg. 25217001516-001 rev.07). pvc ratio for aluminium is 1:3.7. base rate of aluminium alloy ingot ia10, as declared by nalco, is rs. 362.35/kg. , fully machined unplated middle flange (pvn 36) to drg no. 25217001595-var. 00, rev.06. (casting drg. 25217001518-001 rev.10). pvc ratio for aluminium is 1:4.6. base rate of aluminium alloy ingot ia10, as declared by nalco, is rs. rs. 362.35/kg.