Abstract: A cold trap including a section for cooling inflowing liquid sodium, a section for trapping impurities in the sodium, and a double-walled cylindrical structure disposed between the cooling section and the trapping section. The double-walled structure is filled with a heat-insulating gas, and is closed at its upper end but open at its lower end. An expanded portion designed for storing the heat-insulating gas is formed at the open lower end or in the vicinity thereof of the double-walled structure.

Abstract: A descaling slurry is applied to a surface of an elongated metal strip from a nozzle array while the strip is moving in the direction of its length. The nozzle array is positioned in spaced relation to the strip surface and extends transversely to the strip at an acute angle so that the individual slurry streams emanating from the nozzles do not intersect and strike the strip in a line at the same acute angle as the nozzle array. The nozzles of the array are directed toward the strip surface at an acute spray angle in the direction of movement of the strip.