varies in design according to the furnace size and the application in question. Although the heat losses can be reduced by the installation of heat insulation blocks, this also reduces the strength and rigidity. Cast concrete elements have greater strengths and somewhat higher heat conduction properties. This trend has lead to longer working life, thanks to the use of high-quality con- cretes. In most cases, the masonry underpinning of induction coils has been replaced by concreting for cost reasons. With furnace sizes of up to approx. 5 t, the crucible removal device can be installed in a central position. Above 5 t capacity, the installation is displaced excentrically in the direction of the casting spout.
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