Heated cover systems incorporate heaters as modules in trough cover sections, furnace lids, crucibles, filter boxes, low pressure diecast covers, holders, etc. Heated covers allow for the preheat of refractories prior to the introduction of metal, to retain the metal’s heat during transfer, and to hold the molten metal at temperature during periods of inactivity. In addition, the heated cover system keeps refractory surfaces hot, thus avoiding refractory thermal shock.

Depending on the application, a heated cover system can be designed to control temperatures up to 1800°F (982°C).

Launder system designs consider the length of a launder, the flow rate of the metal, the metal temperature, the power rating and density of the heater elements, and the material used in construction of the launder refractory.