Bottom pouring furnaces in large operations are typically of the non-tilting variety. To extract the molten metal from these furnaces through the tap hole, a specialized method is employed. High-frequency induction-welded low carbon mild steel tubes, designed to withstand pressures of up to 750 PSI, are utilized for this purpose. These tubes come in various sizes, such as 8mm NB, 15mm NB, or even 25mm NB in certain cases.
To initiate the flow of molten metal, high-pressure oxygen is injected through these tubes into the tap hole. The rate of pipe consumption is determined by the specific requirements of the Ferro alloy, steel, copper, or zinc plant. Essentially, these lance pipes play a crucial role in the process of opening the tap holes in bottom pouring furnaces.