Tempering furnace used for preheating before welding

Grieve Corp. has produced No. 837, a 1,450-degrees-F electrically heated tempering furnace, used for preheating before welding and various postwelding heat treatments at a customer’s facility.

The furnace’s workspace dimensions are 60 in. wide by 60 in. deep by 60 in. high. Nickel chrome wire coils supported by a stainless steel framework deliver 180 kW to provide heat to the load. The unit also includes a rear wall-mounted, heat-resisting alloy recirculating fan, powered by a 25-HP motor with V-belt drive and water-cooled bearings.

The 8-in.-thick insulated walls comprise 3 in. of 2,300-degrees-F ceramic fiber and 5-in. block insulation, while the 7-in. floor insulation is made from 5 in. of 2,300-degrees-F firebrick and 2 in. of block insulation.