1、 NFPA 51 Standard for the Design and Installation of OxygenFuel Gas Systems for Welding, Cutting, and Allied Processes 2018IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS NFPA codes, standards, recommended practices,
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11、n are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyright 2016 National Fire Protection Association . All Rights Reserved. NFPA 51 Standard for the Design and Installation of OxygenFuel Gas Systems for Welding, Cutting, and Allied Processes 2018
12、Edition This edition of NFPA 51, Standard for the Design and Installation of OxygenFuel Gas Systems for Welding, Cutting, and Allied Processes, was prepared by the Technical Committee on Industrial and Medical Gases. It was issued by the Standards Council on July 22, 2016, with an effective date of
13、August 11, 2016, and supersedes all previous editions. This edition of NFPA 51 was approved as an American National Standard on August 11, 2016, 2016. Origin and Development of NFPA 51 NFPA standards for the construction, installation, and use of acetylene gas machines and for the storage of calcium
14、 carbide date from 1900. The rst edition of NFPA 51 was adopted in 1925. Subsequent editions of NFPA 51 were dated 1927, 1936, 1942, 1944, 1946, 1951, 1953, 1957, 1958, 1960, 1961, 1964, 1969, 1973, 1974, 1977, 1983, 1987, and 1992. In June 1966, responsibility for NFPA 51 was reassigned from the Co
15、mmittee on Gases and its Sectional Committee on Industrial Gases to the Committee on Industrial and Medical Gases. The 1997 edition was revised editorially to make the standard easier to use, understand, and enforce. The 2002 edition of NFPA 51 contained relatively few changes. The most signicant ch
16、anges were clarication of the size of small systems to which the standard would not apply and the requirements for leak testing piping systems. In addition, the document was revised to conform to the 2002 edition of Manual of Style for NFPA Technical Committee Documents, including reordering of the
17、chapters and adoption of SI units as primary units. The changes to the 2007 edition of NFPA 51 were as follows: (1) Use of standard NFPA text for retroactivity and equivalency (2) Changes in Chapters 4 through 9 to be consistent with the 2005 edition of NFPA 55, Standard for the Storage, Use, and Ha
18、ndling of Compressed Gases and Cryogenic Fluids in Portable and Stationary Containers, Cylinders, and Tanks, particularly the storage amounts (3) Adoption of denitions of fuel gas, limited combustible, and noncombustible material that are consistent with the subject matter of the document (4) Elimin
19、ation of several terms that could not be enforced The 2013 edition was reorganized to coordinate maximum allowable quantities (MAQs) and building controls as used in NFPA 55, Compressed Gases and Cryogenic Fluids Code; NFPA 1, Fire Code; NFPA 5000 , Building Construction and Safety Code ; and NFPA 4
20、00, Hazardous Materials Code; with updates to Chapter 4 and the denitions in Chapter 3. Allowable pressures and other requirements for oxygen manifolds were updated and claried. New protocols for mobile acetylene trailer systems (MATS) were added to coordinate with NFPA 51A, Standard for Acetylene C
21、ylinder Charging Plants. The 2018 edition primarily updates information extracted from and references to NFPA 55, ensuring consistency between the two documents.DESIGN AND INSTALLATION OF OXYGENFUEL GAS SYSTEMS FOR WELDING, CUTTING, AND ALLIED PROCESSES 51-2 2018 Edition Technical Committee on Indus
22、trial and Medical Gases Rob Early, Chair Praxair, NY M John J. Anicello, Airgas Inc., WA M William H. Barlen, Barlen and Associates, Inc., NJ SE Rodney L. Barnes, U.S. Department of Energy, TN U Denise Beach, FM Global, MA I Erik W. Christiansen, Exponent, Inc., CA SE Michael Ciotti, Linde North Ame
23、rica, NJ M Julie V. Cordero, Sandia National Laboratories, NM U David J. De Fina, Sterigenics International, Inc., IL IM Kenneth Fegley, Air Products and Chemicals, Inc., PA IM Alejandro Gonzalez, Kryogenifex, FL M Martin T. Gresho, FP2 Fire, Inc., CO SE Gerald T. Hayes, Air Liquide America, AZ IM R
24、ep. Compressed Gas Association Anthony J. Lachawiec, Jr., Intel Corporation, OR M Frank A. Licari, U.S. Department of Transportation, VA E Eugene Y. Ngai, Chemically Speaking LLC, NJ SE Robert R. Nii, CH2M-WG Idaho, LLC, ID U Richard P. Palluzi, Richard Palluzi LLC, NJ SE Diana C. Parks, State of Al
25、aska Department of Public Safety, AK E Carl H. Rivkin, National Renewable Energy Laboratory, CO U David A. Rohrig, Pacic Northwest National Laboratory, WA U Jerrold Sameth, Compressed Gas Association, Inc., NJ IM Rep. Compressed Gas Association William J. Sattereld, III, Hydrogen Safety, LLC/Rode th
26、e installation of associated storage, piping, and distribution equipment; and operating practices. The Committee also has a technical responsibility for contributions in the same areas for medical gases and clean rooms. The Committee shall coordinate the material on gaseous and liquid hydrogen stora
27、ge and use with the Hydrogen Technology Committee.CONTENTS 51-3 2018 Edition Contents Chapter 1 Administration 51 4 1.1 Scope. . 51 4 1.2 Purpose. . 51 4 1.3 Retroactivity. 51 4 1.4 Equivalency. . 51 4 1.5 Fuel Gases in the Liquid Phase. . 51 5 1.6 Operations and Fire Prevention Practices. 51 5 1.7
28、MaterialOxygen Compatibility. 51 5 1.8 Cylinders and Containers. 51 5 1.9 Units and Formulas. . 51 5 Chapter 2 Referenced Publications 51 5 2.1 General. . 51 5 2.2 NFPA Publications. . 51 5 2.3 Other Publications. . 51 5 2.4 References for Extracts in Mandatory Sections. . 51 6 Chapter 3 Denitions 5
29、1 6 3.1 General. . 51 6 3.2 NFPA Ofcial Denitions. 51 6 3.3 General Denitions. 51 6 Chapter 4 Cylinders and Containers 51 7 4.1 Fabrication and Marking. . 51 7 4.2 Cylinder Storage and Use General. . 51 7 4.3 Fuel Gas Cylinder Storage. . 51 8 4.4 Oxygen Cylinder Storage. . 51 9 4.5 Gas Cabinets. . 5
30、1 9 4.6 Exhausted Enclosures. 51 9 4.7 Gas Rooms. . 51 9 Chapter 5 Manifolding of Cylinders . 51 9 5.1 Fuel Gas Manifolds. 51 9 5.2 High-Pressure Oxygen Manifolds. . 51 9 5.3 Low-Pressure Oxygen Manifolds. . 51 10 5.4 Portable Outlet Headers. 51 10 Chapter 6 Piping Systems 51 11 6.1 Materials and De
31、sign. . 51 11 6.2 Piping Joints. . 51 11 6.3 Installation. 51 11 6.4 Cleaning. . 51 11 6.5 Testing. . 51 12 6.6 Painting and Signs. . 51 12 Chapter 7 Protective Equipment, Hose, and Regulators . 51 12 7.1 General. . 51 12 7.2 Pressure Relief for Piping Systems. 51 12 7.3 Piping Protective Equipment.
32、 51 13 7.4 Station Outlet Protective Equipment. . 51 13 7.5 Hose and Hose Connections. . 51 13 7.6 Pressure-Reducing Regulators. 51 13 Chapter 8 Acetylene Generators . 51 13 8.1 Listing and Marking. . 51 13 8.2 Rating and Pressure Limitations. . 51 13 8.3 Location. 51 14 8.4 Stationary Acetylene Gen
33、erators (Automatic and Nonautomatic). . 51 14 8.5 Outside Generator Houses and Inside Generator Rooms for Stationary Acetylene Generators. 51 15 Chapter 9 Calcium Carbide Storage . 51 15 9.1 Packaging. 51 15 9.2 Storage in Buildings. . 51 15 9.3 Storage Outside Buildings. . 51 15 Chapter 10 Mobile A
34、cetylene Trailer Systems . 51 15 10.1 General Provisions. . 51 15 10.2 Discharge Stations at Consumer Sites. . 51 15 10.3 Indoor Discharge Stations. . 51 16 10.4 Instructions. . 51 16 10.5 Fire Protection. . 51 16 Annex A Explanatory Material 51 18 Annex B Informational References . 51 19 Index . 51 21
