Abstract: Method and apparatus to spray the interior surface of a refractory lined vessel that receives molten metal where the interior refractory surface of the vessel is most prone to erode. Supply pipes are introduced into the vessel and are pivotally supported on an upper portion of the vessel to pivot about angularly related axis, such as horizontal and vertical axis. Said pipes are pivoted around at least one of said axis while water is propelled through said elongated pipe to a corroded portion of said interior surface to remove scale from and clean said corroded surface. Air entrained granulated refractory material, preferably mixed with water to form a slurry, is propelled through said pipe to coat the clean interior surface. A movable end portion is hingedly connected to said elongated pipe to provide for the angular control of said movable end portion.

Abstract: Method and apparatus to spray the interior surface of a refractory body, such as a blast furnace having circumferentially spaced windows above its mantle, each facing a different wall portion where the interior surface of the shell is most prone to corrode. Two window operations can be employed simultaneously to introduce supply pipes pivotally supported for pivoting about angularly related axes, such as horizontal and vertical axes, and pivoted about at least one of said axes while water is propelled through said elongated pipe to a corroded portion of said interior surface to remove scale from and clean said corroded surface. Air entrained granulated refractory material, preferably mixed with water to form a slurry, is propelled through said pipe to coat the clean interior surface. The two process operation is repeated for each window to clean and reline the entire perimeter of the wall portion if required.

Abstract: Method and apparatus to spray the interior surface of a refractory body, such as a blast furnace having circumferentially spaced windows above its mantle, each facing a different wall portion where the interior surface of the shell is most prone to corrode. Two window operations can be employed simultaneously to introduce supply pipes pivotally supported for pivoting about angularly related axes, such as horizontal and vertical axes, and pivoted about at least one of said axes while water is propelled through said elongated pipe to a corroded portion of said interior surface to remove scale from and clean said corroded surface. Air entrained granulated refractory material, preferably mixed with water to form a slurry, to propelled through said pipe to coat the clean interior surface. The two process operation is repeated for each window to clean and reline the entire perimeter of the wall portion if required.