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1、NFPA 86C Standard for Industrial Furnaces Using a Special Processing Atmosphere 1999 Edition National Fire Protection Association, 1 Batterymarch Park, PO Box 9101, Quincy, MA 02269-9101 An International Codes and Standards Organization Copyright National Fire Protection Association Provided by IHS
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27、86C1 Copyright 1999 NFPA, All Rights Reserved NFPA 86C Standard for Industrial Furnaces Using a Special Processing Atmosphere 1999 Edition This edition of NFPA 86C, Standard for Industrial Furnaces Using a Special Processing Atmo- sphere, was prepared by the Technical Committee on Ovens and Furnaces
28、 and acted on by the National Fire Protection Association, Inc., at its May Meeting held May 1720, 1999, in Balti- more, MD. It was issued by the Standards Council on July 22, 1999, with an effective date of August 13, 1999, and supersedes all previous editions. Changes other than editorial are indi
29、cated by a vertical rule in the margin of the pages on which they appear. These lines are included as an aid to the user in identifying changes from the previous edition. This edition of NFPA 86C was approved as an American National Standard on August 13, 1999. Origin and Development of NFPA 86C NFP
30、A 86C was first introduced as a tentative standard in 1972. It was adopted with edito- rial revisions as an official standard in 1973. Following its adoption in 1973, NFPA 86C was amended in 1974, 1984, and 1987. The 1984 edition was rewritten completely to follow the NFPA Manual of Style more close
31、ly. The 1987 edition included new requirements for programmable logic controllers along with new per- sonnel safety recommendations in the appendix. The 1991 edition included a complete revision of Chapter 4 on safety equipment and application, new requirements for fuel mixing machines, a new chapte
32、r on open liquid quench tanks, a new chapter on alternative purge methods, and a common Appendix A in accordance with the NFPA Manual of Style. The 1995 edition of NFPA 86C provided correlation with NFPA 86, Standard for Ovens and Furnaces, and NFPA 86D, Standard for Industrial Furnaces Using Vacuum
33、 as an Atmosphere. It also refined and updated the standard to more current technologies, provided increased require- ments in several areas, and expanded the explanatory material in the appendixes. This edition of NFPA 86C includes changes to the technical requirements in several areas. Also includ
34、ed are many refinements to clarify the technical requirements. Changes are also provided to more clearly distinguish mandatory requirements from nonmandatory recom- mendations and explanatory material. Nonmandatory notes have been relocated to the appendixes. Copyright National Fire Protection Assoc
35、iation Provided by IHS under license with NFPA Not for ResaleNo reproduction or networking permitted without license from IHS -,-,- 86C2INDUSTRIAL FURNACES USING A SPECIAL PROCESSING ATMOSPHERE 1999 Edition Technical Committee on Ovens and Furnaces Algirdas Underys, Chair A. Finkl hazardous material
36、s; noise levels; heat stress; and local, state, and federal regulations (EPA and OSHA), that should be considered when designing and operating furnaces. Causes of practically all failures can be traced to human error. The most significant failures include inadequate train- ing of operators, lack of
37、proper maintenance, and improper application of equipment. Users and designers must utilize engineering skill to bring together that proper combination of controls and training necessary for the safe operation of the equipment. This stan- dard classifies furnaces as follows. Class A ovens and furnac
38、es are heat utilization equipment operating at approximately atmospheric pressure wherein there is a potential explosion or fire hazard that could be occa- sioned by the presence of flammable volatiles or combustible materials processed or heated in the furnace. Such flammable volatiles or combustib
39、le materials can, for instance, originate from any of the following: (1) paints, pow- ders, inks, and adhesives from finishing processes, such as dipped, coated, sprayed, and impregnated materials; (2) sub- strate material; (3) wood, paper, and plastic pallets, spacers, or packaging materials; or (4
40、) polymerization or other molecular rearrangements. Potentially flammable materials, such as quench oil, water- borne finishes, cooling oil, or cooking oils, that present a haz- ard are ventilated according to Class A standards. Class B ovens and furnaces are heat utilization equipment operating at
41、approximately atmospheric pressure wherein there are no flammable volatiles or combustible materials being heated. Class C ovens and furnaces are those in which there is a potential hazard due to a flammable or other special atmo- sphere being used for treatment of material in process. This type of
42、furnace can use any type of heating system and includes a special atmosphere supply system(s). Also included in the Class C classification are integral quench furnaces and molten salt bath furnaces. Class D furnaces are vacuum furnaces that operate at tem- peratures above ambient to over 5000F (2760
43、C) and at pres- sures from vacuum to several atmospheres during heating using any type of heating system. These furnaces can include the use of special processing atmospheres. During gas quench- ing, these furnaces may operate at pressures from below atmo- spheric to over 100 psig. Chapter 1General
44、1-1 Scope. 1-1.1 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. 1-1.2 Within the scope of this standard, an oven shall be any heated enclosure operating at app
45、roximately atmospheric pressure and used for commercial and industrial processing of materials. 1-1.3 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 pro- cesses. The work load rema
46、ins under a protective atmosphere from the time it leaves the heating zone until it enters the quench medium. 1-1.4 Within the scope of this standard, a molten salt bath fur- nace shall be any heated container that holds a melt or fusion composed of one or more relatively stable chemical salts that
47、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. 1-1.5 This standard shall not apply to the following: (1) Coal or other solid fuel-firing systems (2) Listed equipment with a heati
48、ng system(s) that supplies a total input not exceeding 150,000 Btu/hr (44 kW). (See definition of Listed.) 1-2 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
49、 the lives of employees, adequate safeguards shall be provided as appropriate for the location, equipment, and operation of such furnaces. 1-3 Application. 1-3.1 The requirements of Chapters 1 through 5 shall apply to equipment described in subsequent chapters except as modified by those chapters. 1-3.2* This entire standard shall apply to new installations or alterations or extensions to existing equipment. 1-3.3 Section 1-5 and Chapter 17 shall apply to all operating furnaces. 1-3.4 No st