MRO Magazine

HD Furnace From Grieve

March 11, 2019 | By MRO Magazine


No. 1039 is a 2,000°F (1,093°C), inert atmosphere, heavy-duty furnace from Grieve, currently used for heat-treating turbine components at the customer’s facility. Workspace dimensions are 36” W x 60” D x 36” H. 73 KW are installed in ICA wire coils supported by vacuum formed ceramic fiber installed on all interior surfaces, including door and beneath the hearth.

This Grieve furnace has a roof-mounted, heat-resisting alloy circulating fan powered by a one horsepower motor with V-belt drive; water-cooled bearings and inert atmosphere shaft seal.

Furnace features include:
-9” thick insulated walls comprised of 5” of 2,300°F ceramic fiber and 4” of 1,900°F block insulation;
-8 ½” floor insulation comprised of 4 ½” of 2,300°F firebrick and 4” of 1,900°F block insulation.
-¼” plate exterior reinforced with structural steel,
-½” steel faceplate at doorway with air-operated vertical lift door.


Inert atmosphere construction includes continuously welded outer shell, high-temperature door gasket, sealed heater terminal boxes, inert atmosphere inlet, inert atmosphere outlet, inert atmosphere flow meter, and manual gas valve.

Controls on No. 1039 include a digital programming temperature controller, a manual reset excess temperature controller with separate contactors, paperless event recorder and SCR power controller.

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