Patent ID: 8114337
Filing Date: 2012-02-14
Classification: C21C,F27D

Abstract:
1. A method of removing from a metallurgical vessel an internally water cooled injection lance to which material is supplied through an injection supply line to an outer end of the lance and to which cooling water is normally supplied from a cooling water circuit through a water supply line connected between the cooling water circuit and the lance and returned to the cooling water circuit via a return line connected between the lance and the cooling water circuit, comprising the steps of: connecting a first flexible hose between a pair of water supply line connection locations spaced along the water supply line and establishing a flow of cooling water through that hose to the lance which bypasses a segment of the water supply line between said connection locations, connecting a second flexible hose between return line connection locations spaced along the return line to establish a return flow of water from the lance which bypasses a segment of the return line between the return line connection locations, isolating at least a part of each of said segments of the water supply line and the return line from both the cooling water circuit and the lance, disconnecting at least a portion of the isolated parts of the water supply line and the return line, disconnecting at least a portion of the injection supply line, and removing the lance from the vessel while maintaining the flow of cooling water through the lance via the flexible hoses.