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NFPA 86C

1999 Edition, 1999

Complete Document

Standard for Industrial Furnaces Using a Special Processing Atmosphere



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Superseded By: NFPA 86

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W/D S/S BY NFPA 86
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Description / Abstract:

This standard shall apply to Class C industrial furnaces, atmosphere generators, and atmosphere supply systems. Also included are furnaces with integral quench tanks or molten salt baths.

Within the scope of this standard, an oven shall be any heated enclosure operating at approximately atmospheric pressure and used for commercial and industrial processing of materials.

Within the scope of this standard, an integral quench tank shall be a container that holds a quench medium into which metalwork is immersed for various heat treatment processes. The work load remains under a protective atmosphere from the time it leaves the heating zone until it enters the quench medium.

Within the scope of this standard, a molten salt bath furnace shall be any heated container that holds a melt or fusion composed of one or more relatively stable chemical salts that form a liquid-like medium into which metalwork is immersed for various processes that include, but are not limited to, heat treating, brazing, stripping, and descaling.

This standard shall not apply to the following:

(1) Coal or other solid fuel-firing systems

(2) Listed equipment with a heating system(s) that supplies a total input not exceeding 150,000 Btu/hr (44 kW). (See definition of Listed.)

Purpose.  Because the heat processing of materials can involve a serious fire and explosion hazard that can endanger the furnace and the building in which the process is located and possibly the lives of employees, adequate safeguards shall be provided as appropriate for the location, equipment, and operation of such furnaces.