procurement of high pressure ibr valves of size 15nb,20 nb,25 nb used in boiler of 2x660 mw sstpp dongalia , valve size:- nb 25mm (1), 4500 class, forged carbon steel (sa105), globe valve, hand operated, socket welded end. certificate: ibr in form iiic issued by director of boilers , valve size- nb 20mm (3/4), 2500 class, forged alloy steel (f22), globe valve, hand operaled, socket welded end. certificate: ibr in form iiic issued by director of boilers , valve size-nb 15mm (1/2), 4500 class, forged alloy steel (f91), globe valve, hand operated, so ket welded end. certificate: ibr in form iiic issued by director of boilers , valve size:- nb 25mm (1), 2500 class, forged alloy steel (f22), globe valve, hand operated, socket welded end. certificate: ibr in form iiic issued by director of boilers , valve size:- nb 25mm (1), 4500 class, forged alloy steel (f91), globe valve, nmanual operated socket welded end. certificate: ibr in form iiic issued by director of boilers