1、 NFPA 56 2017 Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping SystemsIMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA STANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDS NFPA codes, standards, recommended practices, and gu
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10、ative Interim Amendments or corrected by Errata, visit the “Codes email: stds_adminnfpa.org. For more information about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be viewed at no cost at www.nfpa.org/docinfo.56-1 NFPA and National Fire Protection Association are r
11、egistered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169. Copyright 2016 National Fire Protection Association . All Rights Reserved. NFPA 56 Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems 2017 Edition This e
12、dition of NFPA 56, Standard for Fire and Explosion Prevention During Cleaning and Purging of Flammable Gas Piping Systems, was prepared by the Technical Committee on Gas Process Safety. It was issued by the Standards Council on November 11, 2016, with an effective date of December 1, 2016, and super
13、sedes all previous editions. This edition of NFPA 56 was approved as an American National Standard on December 1, 2016. Origin and Development of NFPA 56 In February 2010, an explosion occurred at a power plant construction site as the result of an uncontrolled release of ammable gas that was being
14、used to clean the interior of the fuel piping system. The incident investigation resulted in urgent recommendations being issued by the U.S. Chemical Safety Board (CSB) for NFPA to develop requirements for the “safe conduct of fuel gas piping cleaning operations.” In response, the NFPA Standards Cou
15、ncil established the Technical Committee on Gas Process Safety and tasked that committee with developing a standard to address piping system cleaning and purging operations. As a result of the CSBs urgent recommendation, NFPA issued provisional standard NFPA 56 (PS), Standard for Fire and Explosion
16、Prevention During Cleaning and Purging of Flammable Gas Piping Systems, which prohibits the use of ammable gas as an agent for the interior cleaning of piping systems. NFPA 56 (PS) expanded on the CSB recommendations by including cleaning and purging of all ammable gas piping systems at any inlet pr
17、essure for electric-generating plants and for industrial, commercial, and institutional applications. In addition to the use of ammable gas for cleaning and purging, the provisional standard addressed training requirements for personnel as well as notication of hazards for personnel not directly inv
18、olved in cleaning or purging procedures. The standard required development of written procedures for cleaning and purging activities and that all such written procedures undergo a safety validation performed by a competent person. The denition of competent person was extracted directly from federal
19、Occupational Safety and Health Administration (OSHA) regulations. NFPA 56 (PS) also adopted terminology commonly used by the petrochemical industry for those procedures: purging into service for the process of replacing air in a piping system with inert or ammable gas and purging out of service for
20、the process of replacing ammable gas in the piping system with inert gas or air. In accordance with ANSI requirements for provisional standards, NFPA 56 (PS) was immediately submitted for revision in accordance with the NFPA Regulations Governing Committee Projects. As a result, NFPA 56 is no longer
21、 a provisional standard and will no longer be designated with the sufx “PS.” In the 2014 edition, new requirements were added to address the use of pressure relief valves and their associated piping in purging and cleaning processes. NFPA 55, Compressed Gases and Cryogenic Fluids Code, was exempted
22、from the scope of NFPA 56 in recognition of new requirements added to NFPA 55 to address cleaning and purging of ammable gas piping systems within the NFPA 55 scope. Also, the term source valve was dened and added to the scope because it is the term used in the compressed/industrial gas industry to
23、demarcate the point of delivery to the piping system. The 2014 edition also included additional annex text to further clarify existing and new requirements.FIRE AND EXPLOSION PREVENTION DURING CLEANING AND PURGING OF FLAMMABLE GAS PIPING SYSTEMS 56-2 2017 Edition In the 2017 edition, the requirement
24、s for written procedures for cleaning and purging activities have been modied to include additional topics. The procedures are now required to address nonconductive components in temporary piping assemblies in order to account for the static charge that might be induced by those components. Addition
25、ally, the written procedures must address protection and rescue of personnel, including the selection of re-resistant clothing based on a hazard analysis in accordance with NFPA 2113, Standard on Selection, Care, Use, and Maintenance of Flame-Resistant Garments for Protection of Industrial Personnel
26、 Against Short-Duration Thermal Exposures. New requirements have also been added to the training requirements in Chapter 5 to ensure that knowledge transfer is evident in the training program and to make sure the appropriate information is maintained in the training records.COMMITTEE PERSONNEL 56-3
27、2017 Edition Technical Committee on Gas Process Safety Franklin R. Switzer, Jr., Chair S-afe, Inc., NY SE Hocine Ait Mohamed, Saudi Aramco, Saudi Arabia U Denise Beach, FM Global, MA I Michael W. Bethany, Eclipse/CEC Combustion Safety, Inc., OH M Leon A. Bowdoin, Jr., Consultant, MA SE Christopher S
28、. Buehler, Exponent, Inc., NY SE Paul W. Cabot, American Gas Association, DC IM Bastiaan E. Cornelissen, Spectrum Forensics, LLC, CO SE Larry M. Danner, GE Power & Water, SC M Louis A. Donsbach, Jr., U.S. Steel Corporation, IN U Dan Dorran, Atlas Copco Rental, OR U John P. Doucette, State of CT Depa
29、rtment of Administrative Services, CT E Rob Early, Praxair, Inc., NY M Dennis M. Kovach, American Electric Power, OH U Rep. Edison Electric Institute Kreg J. Levengood, Kiewit Power Engineers, KS SE Robert C. Naper, Energy Experts International, MA SE Rep. ANSI Gas Piping Technology Committee John R
30、. Puskar, PuskarCo, OH SE Alan Rice, American International Group, Inc. (AIG), CT I Jerrold Sameth, Compressed Gas Association, Inc., NJ M Rep. Compressed Gas Association Bruce J. Swiecicki, National Propane Gas Association, IL IM Brett A. Wheelock, OGE/Enogex, OK M Peter J. Willse, Global Asset Pro
31、tection Services, CT I Alternates Pat Convery, Cornerstone Energy Services, MA U (Voting Alt.) Richard A. Craig, Compressed Gas Association, VA M (Alt. to Jerrold Sameth) Scott Neil, DCP Midsteam LLC, CO M (Alt. to Brett A. Wheelock) Sam Pagadala, American International Group, Inc. (AIG), IL I (Alt.
32、 to Alan Rice) Ali Reza, Exponent, Inc., CA SE (Alt. to Christopher S. Buehler) Gordon R. Smith, General Electric Company, NY M (Alt. to Larry M. Danner) Janna E. Shapiro, NFPA Staff Liaison This list represents the membership at the time the Committee was balloted on the nal text of this edition. S
33、ince that time, changes in the membership may have occurred. A key to classications is found at the back of the document. NOTE: Membership on a committee shall not in and of itself constitute an endorsement of the Association or any document developed by the committee on which the member serves. Com
34、mittee Scope: This committee shall have primary responsibility for documents on the commissioning and maintenance of ammable gas piping systems in commercial, industrial, and power plant applications, extending from the point of delivery to the equipment isolation or shutoff valve except for those already covered by the NFPA National Fuel Gas Code Technical Committee and/or the NFPA Hydrogen Technologies Technical Committee.
