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.