NOTICE INVITING TENDER FOR-: Biennial rate contract for Replacement of various sizes of IBR approved pipes, pipe fittings & High Pressure Gate/Globe isolation Valves i.e Start up vent valve, Main steam stop valve, Rack valve etc. /Control valve of PRDS, safety valves of PRDS, Hydra-step of steam drums of Boilers in Steam Generation Plant, RCF (Trombay Unit).