Abstract: With an installation construction method for boiler facilities, the boiler facilities comprise a boiler building configured of a steel structure, and a boiler main unit suspended within the boiler building from the upper portion of the boiler building. A portion of the boiler building is constructed, a portion of the boiler main unit is suspended from the upper portion of the partially-constructed boiler building, and while the remaining steel structure portions are being added to the partially-constructed boiler building so as to construct the boiler building, the remaining portions of the boiler main unit are added to complete the boiler main unit.

Abstract: With an installation construction method for boiler facilities, the boiler facilities comprise a boiler building configured of a steel structure, and a boiler main unit suspended within the boiler building from the upper portion of the boiler building. A portion of the boiler building is constructed, a portion of the boiler main unit is suspended from the upper portion of the partially-constructed boiler building, and while the remaining steel structure portions are being added to the partially-constructed boiler building so as to construct the boiler building, the remaining portions of the boiler main unit are added to complete the boiler main unit.

Abstract: A finned tube comprises a tube; and a fin strip having fins formed by forming slits of a predetermined length in a fin portion of a strip and at predetermined intervals, and a base portion in which no slit is formed, and wound around the tube so that the fins thereof extend substantially radially of the tube. The fins are twisted at a twist angle in the range of 2.degree. to 40.degree. to a contact line along which the base portion of the fin strip is in contact with the tube, and inclined at an inclination angle in the range of 2.degree. to 20.degree. to a straight line perpendicular to the axis of the tube. A heat exchanger is provided with a plurality of such finned tubes, and a heat recovery apparatus comprises such a heat exchanger disposed in a combustion gas passage.