Heater for multiple effect evaporators

Claim 1

A HEATER FOR USE WITH TWO EVAPORATOR BODIES IN SERIES COMPRISING AN UPRIGHT CYLINDRICAL SHELL HAVING END CLOSURES, AN UPRIGHT IMPERFORATE PARTITION IN THE SHELL SEALED AT ITS SIDES AND ENDS TO THE SHELL AND CLOSURES RESPECTIVELY AND DEFINING ISOLATED FIRST AND SECOND CHAMBERS SIDE BY SIDE, TRANSVERSE PLATES SEALED IN THE SHELL SPACED FROM EACH OTHER AND FROM SAID CLOSURES DEFINING IN EACH OF SAID CHAMBERS AN UPPER LIQUID ZONE AND A LOWER LIQUID ZONE SEPARATED BY AN INTERVENING VAPOR ZONE, A PLURALITY OF TUBES IN EACH OF THE CHAMBERS INTERCONNECTING THE RESPECTIVE UPPER AND LOWER LIQUID ZONES THEREOF AND EXTENDING THROUGH THE VAPOR ZONE OF SAID CHAMBER, A VAPOR INLET AND A LIQUID OUTLET FOR EACH VAPOR ZONE, A LIQUID INLET FOR EACH OF THE LOWER LIQUID ZONES, AND A LIQUID OUTLET FOR EACH OF THE UPPER LIQUID ZONES, SAID LIQUID INLETS AND OUTLETS COOPERATING WITH THE TUBES EXTENDING THROUGH THE RESPECTIVE CHAMBERS TO DEFINE WHOLLY SEPARATE LIQUID FLOW PATHS ON OPPOSITE SIDES OF SAID UPRIGHT PARTITION.