1、 NFPA 34 Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids 2018IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS NFPA codes, standards, recommended practices, and guides (“NFP
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31、ndards can be viewed at no cost at www.nfpa.org/docinfo.34-1 NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyright 2017 National Fire Protection Association . All Rights Reserved. NFPA 34 Standard f
32、or Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids 2018 Edition This edition of NFPA 34, Standard for Dipping, Coating, and Printing Processes Using Flammable or Combustible Liquids, was prepared by the Technical Committee on Finishing Processes. It was issued by the
33、Standards Council on November 10, 2017, with an effective date of November 30, 2017, and supersedes all previous editions. This edition of NFPA 34 was approved as an American National Standard on November 30, 2017. Origin and Development of NFPA 34 NFPA standards on safeguarding process tanks contai
34、ning ammable and combustible liquids date from 1913, when standards prepared by the Committee on Explosives and Combustibles were adopted. Subsequently, jurisdiction was transferred to a new Committee on Manufacturing Hazards, which, in turn, was superseded by the current Technical Committee on Fini
35、shing Processes. The original 1913 edition was completely revised in 1921 and 1922, at which time material on hardening and tempering tanks and ow coat work was added to the original standard. Further revisions to keep the text up to date on various new aspects of the subject were adopted in 1922, 1
36、926, 1936, 1940, 1946, 1952, 1957, 1959, 1963, 1966, 1971, 1974, 1979, 1982, 1987, 1989, 1995, 2000, 2003, 2006, and 2010. The following major changes were adopted for the 2003 edition: (1) The scope of the standard was extended to cover water-based coatings. (2) The arrangement of the text was modi
37、ed to comply with the Manual of Style for NFPA Technical Committee Documents, including the relocation of Chapter 11, Referenced Publications, to a new Chapter 2 and the addition of a new Chapter 3, Denitions, which incorporated all the denitions previously located in Chapter 1. (3) Chapter 6 (forme
38、rly Chapter 4), Electrical and Other Sources of Ignition, was extensively revised to recognize the Zone concept of area classication. Included in those revisions were the addition of appropriate denitions and revisions of the gures illustrating the area classications in and around dipping and coatin
39、g processes. (4) Subsection 7.6.1 (formerly 5.5.1) was revised to allow recirculation of exhaust air under certain conditions and to specify those conditions. (5) Chapter 9 (formerly Chapter 7), Protection, was revised to correlate with Chapter 9, Protection, of NFPA 33, Standard for Spray Applicati
40、on Using Flammable or Combustible Materials. (6) Section 11.6 (formerly Section 9.6) was revised to require grounding, as well as deenergizing, of the electrostatic circuit.DIPPING, COATING, AND PRINTING PROCESSES USING FLAMMABLE OR COMBUSTIBLE LIQUIDS 34-2 2018 Edition The following major changes w
41、ere adopted for the 2007 edition: (1) A number of denitions were changed to incorporate “preferred” denitions to ensure consistent meaning and use of dened terms throughout the National Fire Codes. Where “preferred” denitions cannot be used for certain terms, those terms have been delimited by the p
42、hrase “For the purposes of this standard, .”. (2) New denitions were added for the terms electrostatic detearing, peripheral vapor containment, secondary enclosure, solvent cleaning, and ventilation. (3) Requirements for hazardous location electrical utilization equipment and wiring were further rev
43、ised to correlate with NFPA 70 , National Electrical Code , including appropriate Fine Print Notes from NFPA 70. (4) New diagrams were added to illustrate electrical area classication around open dipping and coating processes. (5) Quantity limitations for storing ammable and combustible liquids were
44、 changed to correlate with NFPA 30, Flammable and Combustible Liquids Code. (6) Chapter 9, Protection, was completely rewritten to accomplish the following: (a) Correlate with NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials (b) Add necessary requirements for interloc
45、ks for proper operation of re protection systems (c) Require re protection systems to be designed so that operation does not result in a spill of the ammable or combustible liquid (d) Require re protection systems to discharge into the entire protected area (7) A section on solvent distillation unit
46、s (i.e., solvent recyclers) was added. (8) Additional changes were made to correlate this standard with NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials. The following major changes were adopted in the 2011 edition: (1) The scope of the standard was amended to specica
47、lly address printing processes, and appropriate changes were made throughout NFPA 34 where certain provisions applied specically to the printing process or excluded printing processes. (2) The scope of the standard was amended to specically include vapor degreasing processes and to specically exclud
48、e processes that use only Class IIIB liquids. (3) New denitions for printing and for certain types of printing processes were added to Chapter 3. (4) A new paragraph, 5.2.1.1, was added to allow coating rolls to be covered with polymeric or other combustible materials. (5) Section 5.3, which require
49、s the top of the coating tank to be a certain distance above the oor, was amended to apply only to tanks holding ammable or combustible liquid. (6) Exceptions were added to 5.9.1 and 5.9.2 to exclude sheet and web transport systems from the requirement to stop conveying systems under certain conditions. (7) Paragraph 5.10.1.3 was amended to prevent coating of workpieces whose surface temperature exceeds the boiling point of the coating media. (8) Subsection 6.2.2, which prohibits use of certain ignition-capable equipment, was amen
