Feed water heaters for steam turbine plant

Claim 1

A FEED WATER HEATER FOR STEAM TURBINE PLANT COMPRISING A CASING, AN INTERNAL DUCT LOCATED WITHIN THE CASING AND EXTENDING THROUGH THE MAJOR PORTION OF THE LENGTH OF SAID CASING TO FORM AN ANNULAR SPACE BETWEEN THE OUTER SURFACE OF THE DUCT AND THE INNER SURFACE OF THE CASING, A HEADER AT EACH END OF THE DUCT EACH HEADER COMPRISING CURVED WALLS, A PLURALITY OF TUBES ARRANGED IN RADIAL PLANES WITHIN SAID ANNULAR SPACE, INLET ENDS OF ALL THE TUBES PASSING THROUGH THE CURVED WALLS OF ONE HEADER AND OUTLET ENDS OF ALL THE TUBES PASSING THROUGH THE CURVED WALLS OF THE OTHER HEADER, INLET AND OUTLET PIPES FOR FEED WATER ATTACHED TO ONE OF THE HEADERS, ONE PIPE PASSING THROUGH SAID HEADER AND COMMUNICATING WITH T THE INTERNAL DUCT, TO PROVIDE A FLOW PATH FOR FEED WATER THROUGH THE HEADERS, TUBES AND THROUGH THE FULL LENGTH OF THE INTERNAL DUCT, INLET MEANS FOR STEAM ADJACENT THE HEADER CONNECTED TO THE OUTLET ENDS OF THE TUBES AND OUTLET MEANS FOR CONDENSED STEAM ADJACENT THE OTHER HEADER; THE FLOW PATH FOR STEAM THROUGH THE CASING COMPRISING A DESUPERHEATER SECTION, A CONDENSING SECTION AND A CONDENSATE SECTION, THE CONDENSING SECTION BEING LOCATED IMMEDIATELY ABOVE THE CONDENSATE SECTION AND HAVING RADIAL WALLS THEREIN DIVIDING THE ANNULAR SPACE INTO A NUMBER OF SECTOR-SHAPED COMPARTMENTS EXTENDING FROM THE SURFACE OF CONDENSATE IN THE CONDENSATE SECTION, THERE BEING A PASSAGE AT ONE AXIAL END OF EACH RADIAL WALL, THE PASSAGE AT THE END OF