Pressure-fired once-through boiler

Claim 1

A ONCE-THROUGH PRESSURE-FIRED STEAM BOILER COMPRISING WALLS DEFINING A FIRING CHAMBER AND INCLUDING A SHEETMETAL ENCLOSURE, AN EVAPORATOR SYSTEM LOCATED ON SAID WALLS WITHIN SAID CHAMBER AND COMPRISING UPWARDLY SLOPING EVAPORATOR TUBE PORTIONS AND VERTICALLY ARRANGED OUTLET TUBE PORTIONS LOCATED ABOVE AND SAID VERTICAL TUBE PORTION BEING INTERCONNECTED TO SAID SLOPING TUBE PORTIONS, SAID SLOPING TUBE PORTIONS EXTENDING ABOUT SAID FIRING CHAMBER, HORIZONTAL GIRDERS LOCATED EXTERNALLY OF SAID CHAMBER WALLS AND FORMING A UNIT TOGETHER THEREWITH, A CARRIER STRUCTURE COMPRISING STRUCTURAL STEEL COLUMNS EXTENDING VERTICALLY ALONG SAID UNIT AND HAVING FLANGES DIRECTED OUTWARDLY RELATIVE TO SAID CHAMBER, FIRST SUSPENSION MEANS SUSPENDING SAID EVAPORATOR TUBE SYSTEM FROM SAID COLUMNS AND INCLUDING MEANS CONNECTED TO SAID VERTICAL TUBE PORTIONS, A RADIATION SUPERHEATER TUBE SYSTEM LOCATED ON THE WALL OF SAID CHAMBER ADJACENT TO SAID VERTICAL TUBE PORTIONS, AND SECOND SUSPENSION MEANS SUSPENDING SAID SUPERHEATER TUBE SYSTEM FROM SAID VERTICALLY ARRANGED OUTLET TUBE PORTIONS, SAID CARRIER STRUCTURE INCLUDING THIRD SUSPENSION MEANS LINKED TO THE UPPER ENDS OF SAID COLUMNS FOR SUSPENDING SAID COLUMNS AND THUS SAID EVAPORATOR SYSTEM AND SAID SUPERHEATER TUBE SYSTEM THEREWITH FROM ABOVE.