Heat exchanger

Claim 1

A HEAT EXCHANGER FOR TRANSFERRING HEAT FROM A HEATING FLUID TO A SECOND FLUID, COMPRISING: A CYLINDRICAL VESSEL HAVING A CYLINDRICAL WALL HAVING TWO END PORTIONS, A CLOSURE PLATE AT EACH END OF SAID VESSEL, AN APERTURE IN EACH OF SAID PLATES, ONE OF SAID APERTURES FORMING AN INLET AND THE SECOND APERTURE FORMING AN OUTLET FOR THE HEATING FLUID, A PLURALITY OF TUBES PLACED IN SAID VESSEL FOR CONDUCTING THE SECOND FLUID, A HOLLOW CONNECTING ELEMENT AT EACH END PORTION OF SAID CYLINDRICAL WALL, EACH OF SAID CONNECTING ELEMENTS HAVING A PART EXTENDING THROUGH SAID CYLINDRICAL WALL INTO SAID VESSEL AND BEING TIGHTLY CONNECTED TO SAID CYLINDRICAL WALL, SEPARATE TUBE SHEETS PLACED INSIDE SAID VESSEL AND FACING AND BEING SPACED FROM THE INSIDE WALL OF SAID VESSEL, SAID TUBE SHEETS BEING CONNECTED TO AND CLOSING SAID PART OF SAID CONNECTING ELEMENTS INSIDE SAID VESSEL, EACH OF SAID TUBES HAVING A FIRST END TIGHTLY CONNECTED TO ONE OF SAID TUBE SHEETS AND HAVING A SECOND END TIGHTLY CONNECTED TO THE SECOND TUBE SHEET FOR COMMUNICATING SAID TUBES AND THE INTERIORS OF SAID HOLLOW ELEMENTS, SAID TUBE SHEETS BEING PARALLEL WITH THE LONGITUDINAL AXIS OF SAID VESSEL AND FORMING WITH SAID TUBES A TUBE BUNDLE SUBSTANTIALLY FILLING SAID CASING, SAID TUBE SHEETS BEING CAPABLE OF BEING INSERTED INTO AND REMOVED FROM SAID CYLINDRICAL VESSEL AS A UNIT WITH THE TUBES ATTACHED THERETO IN THE DIRECTION OF THE LONGITUDINAL AXIS OF SAID VESSEL, EACH OF SAID ELEMENTS HAVING A CLOSED PORTION OUTSIDE OF SAID VESSEL, AND A CONDUIT CONNECTED TO EACH OF SAID CLOSED PORTIONS FOR CONDUCTING THE FLUID PASSING THROUGH SAID TUBES.