No. 837 is a 1,450°F electrically heated tempering furnace used for preheating prior to welding and various post welding heat treatments. Workspace dimensions of the furnace are 60 X 60 X 60 in. 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 re-circulating fan powered by a 25HP motor with V-belt drive and water cooled bearings is also on-board this unit. Eight inch-thick insulated walls comprise 3 in. of 2,300° F ceramic fiber and 5-in. block insulation, while 7-in. floor insulation is made from 5 in. of 2,300° F firebrick and 2 in. 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.

The Grieve Corp.
www.grievecorp.com