procurement of spares for strong acid cation (sac), weak base anion (wba), strong base anion (sba) ion-exchanger tanks installed at dm plant of ph-iv,s.t.p.s , sarni. , spares for 2000 dia x 3000 hos strong acid cation exchanger tanks ( sac- a/b ) for middle collecting system , 150 nb header in 2 pcs with gaskets in msr/l , r/c , msr/l,r/c lateral clamping member (50x50x6th angle) (4 pcs/ set) , msr/l ,r/c lateral support members-150 ismc (4 pcs/set) , 33 nb pvc laterals without mark-801 strainers (24 pcs/set) , loose mark-801 strainers , 33 nb rubber grommets , pvc (derlin) lateral locating pegs , pvc packing for vessel cleats (2 pcs/set) , 150 nb resin trap screen , 100 nb resin trap screen , spares for 1800 dia x 3000 hos strong base anion exchanger tanks ( sba-a/b) for middle collecting system , 150 nb header in 2 pcs with gaskets in msr/l , r/c , msr/l, r/c lateral clamping member (50x50x6th angle) (4 pcs/ set) , msr/l, r/c lateral support members-150 ismc (4 pcs/set) , 33 nb pvc laterals without mark-801 strainers ( 20 pcs/set ) , 33 nb rubber grommets , pvc (derlin) lateral locating pegs , pvc packing for vessel cleats(2 pcs/set) , 150 nb resin trap screen , 100 nb resin trap screen , spares for 1800 dia x 2500 hos waek base anion exchanger tanks ( wba -a/b ) for middle collecting system , sp- 15 strainers