NFPA 12A-2015 Standard on Halon 1301 Fire Extinguishing Systems (Effective Date 12 1 2014).pdf

1、NFPA 12A Standard on Halon 1301 Fire Extinguishing Systems 2015 Edition NFPA, 1 Batterymarch Park, Quincy, MA 02169-7471, USA An International Codes and Standards Organization 1/14ISBN: 978-145591033-5 (Print)ISBN: 978-145591079-3 (PDF)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPASTANDARDS NOTIC

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29、 be viewed at no cost at www.nfpa.org/freeaccess.Copyright 2014 National Fire Protection Association. All Rights Reserved.NFPA12AStandard onHalon 1301 Fire Extinguishing Systems2015 EditionThis edition of NFPA 12A, Halon 1301 Fire Extinguishing Systems, was prepared by the Tech-nical Committee on Ga

30、seous Fire Extinguishing Systems. It was issued by the Standards Coun-cil on November 11, 2014, with an effective date of December 1, 2014, and supersedes allprevious editions.This edition of NFPA 12A was approved as an American National Standard on December 1,2014.Origin and Development of NFPA 12A

31、The Committee on Halogenated Fire Extinguishing Systems was formed in the fall of 1966and held its first meeting during December of that year. The Committee was organized intofour Subcommittees who separately prepared various portions of the standard for review bythe full Committee at meetings held

32、in September and December 1967.The standard was submitted and adopted at the Annual Meeting in Atlanta, Georgia, May2024, 1968. The 1968 edition was the first edition of this standard and was adopted intentative form in accordance with NFPA regulations. In 1969 the Committee determined thatthe stand

33、ard had not yet been sufficiently tested and elected to carry it in tentative status forone more year. It was presented for official adoption in 1970. The first official version of thestandard was adopted at the Annual Meeting of NFPA held in Toronto, Ontario in May 1970.Revisions were made in 1972,

34、 1973, 1977, and 1980.The 1985 edition was a complete revision of the standard. The standard was revised in1987 and again in 1989.The standard was completely rewritten for the 1992 revision to more clearly state therequirements and to separate the mandatory requirements from the advisory text in an

35、effortto make the document more usable, enforceable, and adoptable. The main topic addressedin this revision was decommissioning and removal of systems.The standard was updated to conform to the Manual of Style for NFPA Technical CommitteeDocuments for the 2004 edition. For the 2009 edition, the sta

36、ndard was revised to addresstesting and recharging of Halon 1301 cylinders.ForewordHalon 1301 (bromotrifluoromethane, or CBrF3) is a colorless, odorless, electrically non-conductive gas that is an effective medium for extinguishing fires. Halon 1301 is included inthe Montreal Protocol on Substances

37、That Deplete the Ozone Layer signed September 16, 1987. Theprotocol permits continued availability of halogenated fire extinguishing agents at 1986 pro-duction levels. That protocol, and subsequent amendments, restrict the production of thisagent. In addition, local jurisdictions within some countri

38、es (e.g., the EPA in the UnitedStates) have enacted further rules regulating the production, use, handling, and depositionof this agent. The user of this standard is advised to consult local authorities for currentregulations. Halon 1301 fire extinguishing systems are useful within the limits of thi

39、s standardin extinguishing fires in specific hazards or equipment and in occupancies where an electri-cally nonconductive medium is essential or desirable, or where cleanup of other media pre-sents a problem.The 2015 edition incorporates support for electronic storage of system maintenancerecords.12

40、A1NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachusetts 02169.Technical Committee on Gaseous Fire Extinguishing SystemsJeffrey L. Harrington, ChairHarrington Group, Inc., GA SERonald C. Adcock, Marsh Risk Consulting

41、, AZ IKatherine Adrian, Tyco Fire Suppression container stor-age pressure; internal volume of the container; the location,type, and flow rate of each nozzle including equivalent orificearea; the location, size, and equivalent lengths of pipe, fittings,and hose; and the location and size of the stora

42、ge facility. De-tails of pipe size reduction method and orientation of teesshall be clearly indicated. Information shall be submitted per-taining to the location and function of the detection devices,12A8 HALON 1301 FIRE EXTINGUISHING SYSTEMS2015 Editionoperating devices, auxiliary equipment, and el

43、ectrical cir-cuitry, if used. Apparatus and devices used shall be identified.Any special features shall be adequately explained. The manu-facturers version of the flow calculation program shall beidentified on the computer calculation printout. Only the cur-rently listed calculation method shall be

44、used.5.1.2.5 An as-built instruction and maintenance manual thatincludes a full sequence of operation and a full set of drawingsand calculations shall be maintained in a clearly identifiedprotective enclosure at or near the system control panel.5.1.3 When field conditions necessitate any material ch

45、angefrom approved plans, the change shall be submitted for approval.5.1.3.1 When such material changes from approved plans aremade, corrected as-built plans shall be provided.5.2 System Flow Calculations. (See Annex G.)5.2.1 As part of the design procedure, system flow calcula-tions shall be perform

46、ed using a listed calculation method.The system design shall be within the manufacturers listedlimitations.5.2.2 Nozzle orifice sizes shall be selected to achieve the de-signed flow rate. The nozzle shall be selected by consulting thedischarge characteristic information in the manufacturerslisted de

47、sign manual. Flow shall be calculated on the basis ofan average container pressure during discharge, taking intoaccount the original pressurization level, storage filling den-sity, and percent in piping for 70F (21C) storage tempera-ture as shown in Figure H.1(e).5.2.3 Valves shall be rated for equi

48、valent length in terms of thepipe or tubing sizes with which they will be used. The equivalentlength of container valves shall be listed and shall include siphontube, valve, discharge head, and flexible connector.5.2.4 The nozzle and fitting orientation shall be in accor-dance with the manufacturers

49、 listed limitations to ensureproper system performance. (See Annex H.)5.2.5 If the final installation varies from the prepared calcu-lations, new calculations representing the as-built installationshall be prepared.5.2.6 Halon 1301 total flooding systems shall not be used inconcentrations greater than 10 percent in normally occupiedareas. Areas that might contain 10 percent Halon 1301 shall beevacuated immediately upon discharge of the agent. Whereegress cannot be accomplished within 1 minute, Halon 1301total flooding systems shall not be used in normally occupiedare