The Grieve Corp.
The No. 837 electrically heated tempering furnace has a maximum operating temperature of 1450°F (788°C). Workspace dimensions measure 60 in. wide °- 60 in. deep °- 60 in. high. Nickel chrome wire coils, supported by a stainless steel framework, provide heat to the load. A rear wall-mounted, heat-resisting alloy recirculating fan, powered by a 25-hp motor with V-belt drive and water-cooled bearings, is also included on this unit. The furnace has 8-in. thick insulated walls comprising 3-in. 2300°F (1260°C) ceramic fiber and 5-in. block insulation, while 7-in. floor insulation is made from 5-in. 2300°F (1260°C) firebrick and 2-in. block insulation. The furnace also includes an air-operated vertical lift door, as well as numerous safety and control components, including a programming and recording temperature recorder, SCR power controller, manual reset excess temperature controller with separate contactors, and a recirculating blower airflow safety switch.
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