No. 872 is an electrically-heated 1000°F (537.7°C) inert atmosphere oven from Grieve, currently used for annealing copper foil parts. 36 KW are installed in Incoloy sheathed tubular heating elements. Workspace dimensions are 36″ wide x 48″ deep x 36″ high. A 2000 CFM, 2-HP recirculating blower provides airflow to the workload.
The oven has 8″ thick insulated walls comprised of 1900°F block and 6″ of 10 lb/cf density rockwool, plus an aluminized steel exterior and interior. A structural steel base is provided to raise the roller rails to a 20″ loading height. These roller rails, mounted on the bottom of the oven workspace, are rated for a 2000 lbs. load.
No. 872 features Grieve inert atmosphere oven construction, which includes a pressure regulator, flow meter, pressure gauge, internal high-temperature gasket, all welded construction in the doorway throat, air jacket on inner oven for cooling, 1/2″ thick cellular silicone rubber atmosphere seal, blower shaft seal, positive latching door hardware, adjustable offset door hinges, outlet with pressure relief, interior seams welded gas-tight and all wall penetrations fitted with compression fittings.
A 975 CFM blower with automatic dampers pulls air through the air jacket on the inner oven for cooling, while the oven’s quick-purge system includes a 1200 SCFM flow meter and solenoid to open the outlet.
Controls on No. 972 include a recording and programming temperature recorder and a fused disconnect switch.