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The inductor was updated to include a copper bushing with a water-cooled bushing joint cap.
But because the temperatures around the bushing were well below the 1100F (593C) shutdown temperature, operators decided to continue melting.
The life of the inductor on this furnace is now judged by the refractory temperatures around the bushing.
thick magnesia lining between the channel and the bushing suggests that the saturation network would be limited to a depth of about 1.
How close to the bushing will the saturation network get before freezing is a function of the heat extraction capabilities of the bushing.
The saturation network freezes symmetrically at some distance around the bushing except at the insulated joint.