Coil repair in the installed condition is only possible in the case of a few furnace manufacturers. This must be an open cage construction, in which the iron piles can if necessary be detached from the outside and moved to the side. The coil jacket is
then cut open at the damaged point of the coil. The coil can then be exposed from
the inside by removing the coil plastering or smooth coil coating. The damaged
intermediate layer insulation is removed, and the defective coil copper cleaned
and repaired. After the water pressure test, the intermediate layer insulation is
installed, the coil copper painted and the repair spot dried with hot air for
approx. 15 min.[1] The plastering can then be applied again. Before lining the crucible, the repair spot should be allowed to dry for 4 to 12 hours, depending on
the thickness and density of the coil plastering.[1] The coil jacket is glued back on
again from outside, and the cut areas sealed off with glass fibre material. The
iron pile or piles are replaced in position and attached using the press-screws.
References
- Herbert H. Netzel: Induktionsofenhandbuch. 3rd edition, Eigenverlag IES, Witten 2003, pp. 183–184.
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