Vertical tube fluid heater

Claim 1

A HEATER FOR FLUIDS COMPRISING: (A) END WALLS AND A FLOOR; (B) A SIDE WALL DISPOSED BETWEEN SAID END WALLS; (C) A SECOND SIDE WALL OF SMALLER HEIGHT DISPOSED PARALLEL TO SAID FIRST SIDE WALL AND FORMING A RADIANT HEATING SECTION; (D) A ROOF MOUNTED ON SAID END WALLS AND SAID FIRST SIDE WALL AND FORMING AN OPENING BETWEEN SAID ROOF AND THE UPPER PORTION OF SAID SECOND SIDE WALL; (E) UPPER SIDE AND END WALLS MOUNTED ON SAID ROOF AND AROUND SAID OPENING AND DEFINING A CONVECTION SECTION WITH SAID END WALLS, THE AXIS OF SAID CONVECTION SECTION BEING OFFSET FROM THE AXIS OF SAID RADIANT SECTION, AND SAID CONVECTION SECTION BEING IN FLUE GAS COMMUNICATION ONLY WITH SAID RADIANT SECTION VIA SAID OPENING; (F) VERTICAL PROCESS TUBE MEANS POSITIONED INTERMEDIATE SAID SIDE WALLS IN SAID RADIANT SECTION; (G) A PLURALITY OF ROWS OF RADIANT BURNERS POSITIONED IN SAID SIDE WALLS OF SAID RADIANT SECTION, EACH ROW OF BURNERS HAVING A MANIFOLD ASSOCIATED THEREWITH AND EACH MANIFOLD HAVING VALVE MEANS WHEREBY EACH ROW OF BURNERS IS INDIVIDUALLY CONTROLLED; (H) CONVECTION HEATING MEANS IN SAID CONVECTION SECTION, SAID MEANS COMPRISING FIRST AND SECOND SERPENTINE CONDUIT MEANS; (I) CROSSOVER MEANS IN FLUID COMMUNICATION WITH SAID VETICAL PROCESS TUBE MEANS AND SAID FIRST SERPINTINE CONDUIT MEANS, ONE SERPENTINE CONDUIT MEANS BEING IN FLUID COMMUNICATION WITH A SINGLE PROCESS TUBE MEANS; (J) INLET MEANS FOR SAID FIRST SERPENTINE CONDUIT MEANS; (K) INLET AND OUTLET MEANS FOR SAID SECOND SERPENTINE CONDUIT MEANS; AND (L) OUTLET MEANS FOR SAID VERTICAL PROCESS TUBE MEANS.