NFPA 69-2014 Standard on Explosion Prevention Systems (Effective Date 12 2 2013 ALERT THIS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATA).pdf
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1、NFPA69See ALERTStandard onExplosion PreventionSystems2014ISBN: 978-145590847-9 (Print) ISBN: 978-145590858-5 (PDF)IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPASTANDARDS NOTICE AND DISCLAIMER OF LIABILITY CONCERNING THE USE OF NFPA STANDARDSNFPAcodes, standards, recommended practices, and guides
2、(“NFPA Standards”), of which the document contained herein is one, are developed through a consensus standards development process approved by the American National Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on fire
3、and other safety issues. While the NFPA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy of any information or the soundness of any judgments contained in NFPA Standards.The NFPA discla
4、ims liability for any personal injury, property or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, or reliance on NFPA Standards. The NFPA also makes no guaranty or warranty as to the acc
5、uracy or completeness of any information published herein.In issuing and making NFPA Standards available, the NFPA is not undertaking to render professional or other services for or on behalf of any person or entity. Nor is the NFPA undertaking to perform any duty owed by any person or entity to som
6、eone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances.The NFPA has no power, nor does it undertake, to police or enforce compli
7、ance with the contents of NFPA Standards. Nor does the NFPA list, certify, test, or inspect products, designs, or installations for compliance with this document. Any certification or other statement of compliance with the requirements of this document shall not be attributable to the NFPA and is so
8、lely the responsibility of the certifier or maker of the statement.ALERT: THIS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATAUsers of NFPA codes, standards, recommended practices, and guides (“NFPA Standards”) should be aware that NFPA Standards may be amended from time to time through the issuance o
9、f Tentative Interim Amendments or corrected by Errata. An official NFPA Standard at any point in time consists of the current edition of the document together with any Tentative Interim Amendment and any Errata then in effect.In order to determine whether an NFPA Standard has been amended through th
10、e issuance of Tentative Interim Amendments or corrected by Errata, visit the “Codes email: stds_adminnfpa.orgFor 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.IMPORTANT NOTICES AND DISCLAIMERS CONCER
11、NING NFPASTANDARDS Copyright 2013 National Fire Protection Association. All Rights Reserved.NFPA69Standard onExplosion Prevention Systems2014 EditionThis edition of NFPA 69, Standard on Explosion Prevention Systems, was prepared by theTechnical Committee on Explosion Protection Systems. It was issue
12、d by the Standards Coun-cil on November 12, 2013, with an effective date of December 2, 2013, and supersedes allprevious editions.This document has been amended by one or more Tentative Interim Amendments (TIAs)and/or Errata. See “Codes for high-strength enclo-sures the enclosure design pressure suf
13、ficient to resist Pred.68, 20133.3.14 Explosion. The bursting or rupture of an enclosure ora container due to the development of internal pressure froma deflagration.697DEFINITIONS2014 Edition3.3.15 Fast-Acting Valve. A valve that closes a path of deflagra-tion propagation in a pipe or duct in respo
14、nse to upstreamdetection of a deflagration.3.3.16* Flame Arrester. A device that prevents the transmis-sion of a flame through a flammable gas/air mixture byquenching the flame on the surfaces of an array of small pas-sages through which the flame must pass.3.3.17 Flame Front Diverter. A device that
15、 opens in responseto the pressure wave preceding the flame front of the deflagra-tion, thereby venting the pressure wave and flame front.3.3.18 Flame Speed. The speed of a flame front relative to afixed reference point. 68, 20133.3.19*FlammableLimits. The minimum and maximum con-centrations of a com
16、bustible material in a homogeneous mix-ture with a gaseous oxidizer that will propagate a flame.3.3.19.1 Lower Flammable Limit (LFL). The lowest con-centration of a combustible substance in an oxidizing me-dium that will propagate a flame.3.3.19.2 Upper Flammable Limit (UFL). The highest con-centrat
17、ion of a combustible substance in a gaseous oxidizerthat will propagate a flame. 68, 20133.3.20 Flammable Range. The range of concentrations be-tween the lower and upper flammable limits. 68, 20133.3.21 Gas. The state of matter characterized by completemolecular mobility and unlimited expansion; use
18、d synony-mously with the term vapor.68, 20133.3.21.1 Inert Gas. A gas that is noncombustible and non-reactive.3.3.21.2 Purge Gas. An inert or a combustible gas that iscontinuously or intermittently added to a system to renderthe atmosphere nonignitible.3.3.22*HybridMixture. An explosible heterogeneo
19、us mixture,comprising gas with suspended solid or liquid particulates, inwhich the total flammable gas concentration is 10 percent ofthe lower flammable limit (LFL) and the total suspended par-ticulate concentration is 10 percent of the minimum explosibleconcentration (MEC). 68, 20133.3.23 Inerting.
20、 A technique by which a combustible mixtureis rendered nonignitible by adding an inert gas or a noncom-bustible dust. (See also 3.3.1, Blanketing.)3.3.24* Isolation. A means of preventing certain stream prop-erties from being conveyed past a predefined point.3.3.24.1 Chemical Isolation. A means of p
21、reventing flamefront and ignition from being conveyed past a predeter-mined point by injection of a chemical suppressant.3.3.24.2 Deflagration Isolation. A method employing equip-ment and procedures that interrupts the propagation of adeflagration flame front past a predetermined point.3.3.24.3 Flow
22、 Isolation. A method employing equipmentand procedures that interrupts flow and prevents pressurerise beyond a predetermined point.3.3.24.4 Ignition Source Isolation. A method employingequipment and procedures that interrupts the propaga-tion of an igniting medium past a predetermined point.3.3.25*
23、Limiting Oxidant Concentration (LOC). The concen-tration of oxidant in a fuel-oxidant-diluent mixture belowwhich a deflagration cannot occur under specified conditions.3.3.26 Liquid Seal. A device that prevents the passage of flameby passing the gas mixture through a noncombustible liquid.3.3.27 Max
24、imum Experimental Safe Gap (MESG). The maxi-mum clearance between two parallel metal surfaces that hasbeen found, under specified test conditions, to prevent anexplosion in a test chamber from being propagated to a sec-ondary chamber containing the same gas or vapor at the sameconcentration. 497, 20
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