1、NFPA86 Standard for Ovens and Furnaces 2015 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471 An International Codes and Standards Organization 1/14ISBN: 978-145590895-0 (Print)ISBN: 978-145590928-5 (PDF)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPASTANDARDS NOTICE AND DISCLAIMER OF LIABI
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29、www.nfpa.org/freeaccess.Copyright 2014 National Fire Protection Association. All Rights Reserved.NFPA86Standard forOvens and Furnaces2015 EditionThis edition of NFPA 86, Standard for Ovens and Furnaces, was prepared by the TechnicalCommittee on Ovens and Furnaces. It was issued by the Standards Coun
30、cil on April 29, 2014,with an effective date of May 19, 2014, and supersedes all previous editions.This edition of NFPA 86 was approved as an American National Standard on May 19, 2014.Origin and Development of NFPA 86The history of the NFPA standards for ovens and furnaces goes back to NBFU 34, Reg
31、ula-tions of the Board of Fire Underwriters for Finishing Processes (other than paint spraying) Dip Tanks,Hardening and Tempering Tanks, Flow Coat Work, Japanning and Enameling Including Ovens asRecommended by the National Fire Protection Association, which was issued in 1926. Subsequently,the ovens
32、 part of NBFU 34 was separated and issued as NBFU 86, Regulations of the NationalBoard of Fire Underwriters for Ovens For Japan, Enamel, and Other Flammable Finishes as Recommendedby the National Fire Protection Association, in 1931. In 1948, NBFU 86 became NFPA 86-T, TentativeStandards for Class A
33、Oven Design, Location and Equipment. The document was issued as a stan-dard in 1950 and titled NFPA 86, Standards for Class A Ovens and Furnace Design, Location andEquipment.The 1985 edition of NFPA 86 was the first edition of the standard in its current form. It wascreated from the combination of t
34、he former NFPA 86A, Standard for Ovens and Furnaces Design, Location and Equipment, and NFPA 86B, Standard for Industrial Furnaces Design, Loca-tion and Equipment.The committee introduced changes in the definitions of Class A and Class B ovens, whichwere published in the 1982 edition of NFPA 86B and
35、 added as a tentative interim amendmentin 1983 to the 1977 edition of NFPA 86A. The changes in the definitions eliminated theprincipal differences between the two standards, except for the ventilation requirementscontained in NFPA 86A. By providing a separate chapter for ventilation requirements in
36、the1985 edition (Chapter 5), the Committee found it was no longer necessary or desirable tomaintain two separate documents that addressed the same subjects.The changes that were incorporated into the 1985 edition included the following:(1) A new chapter dealing with low-oxygen atmosphere ovens was a
37、dded.(2) The definitions of subjects contained in the text were updated and new definitions pro-vided.(3) The text was refined in an effort to make the document more understandable.(4) The material was rearranged to comply with the NFPA Manual of Style.The 1995 edition of NFPA 86 correlated with NFP
38、A 86C, Standard for Industrial FurnacesUsing a Special Processing Atmosphere, and NFPA 86D, Standard for Industrial Furnaces UsingVacuum as an Atmosphere. It also refined and updated the standard to more current technolo-gies, provided increased requirements in several areas, and expanded the explan
39、atory mate-rial in the appendixes.The 1999 edition of NFPA 86 included changes to the technical requirements in severalareas and many refinements that clarified the technical requirements. Changes were alsoprovided to more clearly distinguish mandatory requirements from nonmandatory recom-mendations
40、 and explanatory material. Nonmandatory notes were relocated to the appen-dixes.861NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.The 2003 edition of NFPA 86 was a complete revision that incorporated NF
41、PA 86C, Standard for Industrial FurnacesUsing a Special Processing Atmosphere, and NFPA 86D, Standard for Industrial Furnaces Using Vacuum as an Atmosphere. Thisnew, combined document provided one standard for ovens and furnaces of all types. Also, in accordance with theManual of Style for NFPA Tech
42、nical Committee Documents, referenced publications were listed in Chapter 2 and all defini-tions moved to Chapter 3.The 2007 edition of NFPA 86 continued to bring the standard into compliance with the Manual of Style for NFPATechnical Committee Documents and to update requirements. Requirements for
43、logic systems and programmable logiccontrollerbased systems replaced the requirement that programmable logic controllers be specifically listed forcombustion safety service, since listed controllers were no longer available. Unenforceable text was (1) revised to beenforceable, (2) deleted, or (3) re
44、located to Annex A. Where appropriate, repetitive text was replaced by tables. Theformer Chapter 14, Inspection, Testing and Maintenance, was renumbered and renamed as Chapter 7, Commission-ing, Operations, Maintenance, Inspection, and Testing. Requirements for operations and maintenance throughoutt
45、he standard were then relocated to that chapter.In the 2011 edition, the scope of NFPA 86 was clarified to exclude fluid heaters, and reference was made to the newNFPA 87, Recommended Practice for Fluid Heaters. All requirements for fire protection were relocated to Chapter 9.Chapter 13, which cover
46、s Class C furnaces, was revised to clarify the requirements for the introduction and removal ofspecial atmospheres. The requirements for repeated pre-ignition purge were revised to recognize the unique charac-teristics of ovens utilizing pulse firing of burners. In addition, the requirements for saf
47、ety shutoff valves that must closewhen a burner experiences a loss of flame signal were clarified.The 2015 edition of NFPA 86 includes several changes to Chapter 3 due to the addition of definitions for burnermanagement system, flame failure response time, flame detector, hardwired, combustion safeg
48、uard, and pressure regulator types.The Committee also deleted requirements from Chapter 12 applicable to arc melting furnaces (or electric arc fur-naces) as the provisions have not been maintained and the Committee no longer has the relevant expertise. TheCommittee added procedures for placing equip
49、ment into service based on purging practices in NFPA 54 and NFPA 56.The Committee modified the standard to clarify the types of acceptable devices used for combustion safety service. TheCommittee added a requirement prohibiting manifolding vent lines from different pressure levels. As a result ofintroducing definitions for burner management system and combustion safeguard, the Committee modified requirements inChapter 8 for logic systems for both BMS logic and programmable logic controller (PLC) systems. The Committeemodified requirements for Class A and Class C ovens and fur
