Abstract: A cover for a metallurgical vessel has a top part formed as a flat, generally circular, and normally horizontal array of tubes having an outer edge and forming a plurality of vertically throughgoing passages. These tubes extend mainly angularly of the center of the array. Respective pluralities of annular tubes at and extending around the passages are connected with each other at the center and with the tubes of the flat array. This top part has a skirt formed as an annular array of generally vertical tubes extending downwardly from the outer edge and connected with the tubes of the flat array. Respective partially circularly annular collars at the passages on the flat array have inwardly directed closely juxtaposed ends. The collars and tubes are connected together as a rigid assembly. A coolant is circulated through the tubes.

Abstract: A cover for a metallurgical vessel comprises an annular outer tubular collar defining a center, a plurality of tubular legs extending inwardly from the collar toward the center, and an annular inner tubular collar fixed to the legs and defining a plurality of throughgoing passages. The inner collar is formed by respective inwardly concave tubular sections defining the passages and respective inwardly convex and tubular elbow sections carried on the legs between the passages and forming an undulating annulus with the inwardly concave sections. A multiplicity of cooling tubes extend between the collars and legs and are connected thereto, and a cooler is provided for circulating a coolant through the tubes, collars, and legs. This system ensures excellent cooling right at the passages, so electrodes extending through these passages need not be provided with their own coolers.

Abstract: Process of cooling waste gas bend and apparatus for carrying out same, said process comprising removing concentrated heat at said bend by feeding coolant at an adjustable pressure through cooling channels longitudinally disposed along a selected sector of the cross-section of the bend, the channels being of equal flow cross-section within the entire circuit, said heat being reduced to a level prevailing in the cool sections of the bend portion of the casing (i.e. the cooler sections of the cross-section).

Abstract: A damper construction, comprises, a central hollow tubular pipe pivot portion having an axially extending interior pipe coolant flow passage therethrough and a substantially cylindrical flat plate portion connected to the pipe pivot portion. The pipe pivot portion is mounted for rotation in a bearing formed at diametrically opposite sides of a tubular conduit made up of walls formed by longitudinal pipes arranged side-by-side in a circular pattern and welded together. The bearing includes a hollow portion and it is furnished with coolant which is circulated through the pipes of the conduit.

Abstract: A cooled jacket construction for an electric arc furnace is provided, the jacket consisting of a cooling system embedded in a refractory lining and mounted on a metallic outer shell. The cooling system comprises a plurality of plate-shaped pipe segments arranged side-by-side over the periphery of the furnace and consisting of a pipe-to-pipe construction of substantially cylindrical individual pipes, welded together for guiding a coolant over a serpentine path through the cooling system.