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1、NFPA 34 Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids 2000 Edition NFPA, 1 Batterymarch Park, PO Box 9101, Quincy, MA 02269-9101 An International Codes and Standards Organization NFPA License Agreement This document is copyrighted by the National Fire Protection A
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27、y where the public interest will be served thereby. 3. Scope of License GrantThe terms and conditions set forth above do not extend to the index of this document. (For further explanation, see the Policy Concerning the Adoption, Printing, and Publication of NFPA Documents, which is available upon re
28、quest from the NFPA.) The Standard is downloaded from Standard Sharing 341 Copyright 2000 NFPA, All Rights Reserved NFPA 34 Standard for Dipping and Coating Processes Using Flammable or Combustible Liquids 2000 Edition This edition of NFPA 34, Standard for Dipping and Coating Processes Using Flamma
29、ble or Com- bustible Liquids, was prepared by the Technical Committee on Finishing Processes, and acted on by the National Fire Protection Association, Inc., at its World Fire Safety Congress and Exposition held May 1417, 2000, in Denver, CO. It was issued by the Standards Council on July 20, 2000,
30、with an effective date of August 18, 2000, and supersedes all previous editions. This edition of NFPA 34 was approved as an American National Standard on August 18, 2000. Origin and Development of NFPA 34 NFPA standards on the safeguarding of process tanks containing flammable and combus- tible liqu
31、ids 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 Subsequently, jurisdiction was transferred to a new Committee on Manufacturing Hazards which, in turn, was superseded by the present Committee on Fin- ishing Processes. The original 1913 edition
32、was completely revised in 1921 and 1922 at which time harden- ing and tempering tanks and flow coat work were added to the original standard. Further revi- sions to keep the text up to date with material on various new aspects of the subject were adopted in 1922, 1926, 1936, 1940, 1946, 1952, 1957,
33、1959, 1963, 1966, 1971, 1974, 1979, 1982, 1987, 1989, 1995, and 2000. The following are the major changes adopted in this 2000 edition. The scope of the standard has been extended to cover water-based coatings. Definitions related to flammable and combustible liquids and to ventilation have been ext
34、racted from NFPA 30, Flammable and Combustible Liquids Code. Numerous editorial changes have been made to replace ambiguous text and to correlate with similar, parallel, language used in NFPA 33, Standard for Spray Application Using Flammable or Combustible Materials. Section 7.5 has been amended to
35、 specify which types of extinguishing systems are required and to allow fusible link mechanisms for process tank covers. Section 7.6 has been amended to allow alternative means of protection for coating systems that cannot be readily fitted with automatic closing covers. The safety of life and prope
36、rty from fire or explosion in dipping and coating processes using flammable or combustible liquids depends upon the characteristics and quantities of materials used, the operations and equipment involved, and the knowledge and understand- ing of operating personnel. Maintaining good safety, producti
37、on, and maintenance practices contributes toward minimizing the likelihood of fire or explosion. The Standard is downloaded from Standard Sharing 342DIPPING AND COATING PROCESSES USING FLAMMABLE OR COMBUSTIBLE LIQUIDS 2000 Edition Technical Committee on Finishing Processes Edward Watson, Chair Zuri
38、ch American, GA I W. H. White, Secretary White Consulting Services, OH SE Richard A. Bannister, R. S. Finishing Systems, ON, Canada IM Constance Bayne, Liberty Mutual Insurance Co., OH I Rep. The Alliance of American Insurers John Bloomgren, Forward Technology Industries, Inc., MN M John E. Cieslik,
39、 CSA, Ford Motor Co., MI U Paul H. Dobson, Factory Mutual Research Corp., MA I Thomas G. Euson, 3S, Inc., OH IM John Gokey, Ansul Inc./Tyco, WI M Rep. Fire Equipment Mfrs. Assn. Steven J. Gunsel, Marsh, Inc., OH I Steven D. Jensen, 3M Company, MN U John Katunar, III, HSB Industrial Risk Insurers, MI
40、 I Rich Kimbrough, Kimbrough Fire Extinguisher Co., Inc., TX IM Rep. Natl Assn. of Fire Equipment Distributors Inc. William G. Kullman, Graco Inc., MN M John C. Larson, DuPont Automotive, PA M Michael Loan, Nordson Corp., OH M John McKnight, Natl Marine Mfrs. Assn., DC U Rep. Society of the Plastics
41、 Industry Inc. Kerry L. McManama, Underwriters Laboratories Inc., IL RT Lowell Miles, Miles Fiberglass (b) Class IIIA any liquid that has a flash point at or above 140F (60C), but below 200F (93C); The Standard is downloaded from Standard Sharing CONSTRUCTION AND DESIGN OF DIPPING AND COATING EQUIP
42、MENT AND SYSTEMS345 2000 Edition (c) Class IIIB any liquid that has a flash point at or above 200F (93C). (30: 1.7.2 and 1.7.3) 1.6.6 Curtain Coating. A coating process by which an object or material is coated by passing it through a vertically flowing film of liquid. 1.6.7 Detearing. A process for
43、removing excess wet coating material from the bottom edge of a dipped or coated object or material by passing it through an electrostatic field. 1.6.8 Dip Tank. A tank, vat, or container of flammable or com- bustible liquid into which objects or materials are immersed for the purpose of coating, cle
44、aning, or similar processes. 1.6.9 Electrical Utilization Equipment. Equipment that uti- lizes electric energy for electronic, electromechanical, chemi- cal, heating, lighting, or similar purposes. (70: Article 100) 1.6.10 Flammable Liquid. Any liquid that has a closed-cup flash point below 100F (37
45、.8C), as determined by the test procedures and apparatus set forth in NFPA 30, Flammable and Combustible Liquids Code, 1.7.4. Flammable liquids shall be classified as Class I as follows: (a) Class I Liquid any liquid that has a closed-cup flash point below 100F (37.8C) and a Reid vapor pressure not
46、exceeding 40 psia (2068.6 mm Hg) at 100F (37.8C), as determined by ASTM D 323, Standard Method of Test for Vapor Pressure of Petroleum Products (Reid Method). Class I liquids shall be further classified as follows: (1) Class IA liquids those liquids that have flash points below 73F (22.8C) and boili
47、ng points below 100F (37.8C); (2) Class IB liquids those liquids that have flash points below 73F (22.8C) and boiling points at or above 100F (37.8C); (3) Class IC liquids those liquids that have flash points at or above 73F (22.8C), but below 100F (37.8C). (30: 1.7.2 and 1.7.3) 1.6.11 Flow Coating.
48、 A coating process by which the coating liquid is discharged in an unatomized state from nozzles, slots, or other openings onto the object or material to be coated. 1.6.12 Labeled. Equipment or materials to which has been attached a label, symbol, or other identifying mark of an orga- nization that
49、is acceptable to the authority having jurisdiction and concerned with product evaluation, that maintains peri- odic inspection of production of labeled equipment or mate- rials, and by whose labeling the manufacturer indicates compliance with appropriate standards or performance in a specified manner. 1.6.13 Liquid. Any material that has a fluidity greater than that of 300 penetration asphalt when tested in accordance with ASTM D 5, Standa