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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.
The inductor had a copper water-cooled bushing fitted with a water-cooled joint cap, and was lined with a spinel bonded alumina refractory grain.
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.
One alternative in heading off the adverse thermal discontinuity due to the bushing joint insulator is water cooling the insulated joint in the bushing as shown in Fig.