No. 837 is a 1450°F electrically-heated tempering furnace from Grieve currently used for pre-heating prior to welding and post weld heat treatment.
Workspace dimensions of this furnace measure 60″ wide x 60″ deep x 60″ high, 180 kW installed in 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 on-board this unit.
Eight inch thick insulated walls comprised of 3″ of 2300°F ceramic fiber and 5″ block insulation, while 7″ floor insulation is made from 5″ of 2300°F firebrick and 2″ of block insulation.
No. 837 features 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.