No. 893 is a 850°F (454.4°C), electrically-heated high temperature oven from Grieve, currently used for heat treating parts on rollout shelves. Workspace dimensions on this oven measure 54″ wide x 72″ deep x 78″ high. 80 KW are installed in Incoloy sheathed tubular heating elements to heat the oven chamber, while a 6000 CFM, 5 HP recirculating blower provides horizontal airflow to the workload.
This Grieve oven has 8″ insulated walls comprising 2″ of 1900°F block and 6″ of 10 lb/cf density rockwool insulation, plus an aluminized steel interior and exterior, top-mounted heat chamber and three rollout shelves, each 48″ wide by 60″ long and rated 200 lbs. distributed load capacity.
Controls on No. 893 include a digital programming and recording temperature controller, manual reset excess temperature controller with separate contactors, recirculating blower air flow safety switch, SCR power controller, and fused disconnect switch.