SVENSK STANDARDSS-EN 60079-29-3 Fast st l l d 2015-01-28 Ut gva 1 Si da 1 (1+48) Ansvar i gkommi t t SEK TK 31 Copyright SEK. Reproduction in any form without permission is prohibited. ICS 29.260.20 Denna standard r faststlld av SEK Svensk Elstandard,som ocks kan lmna upplysningar om sakinnehllet i standarden. Postadress: Box 1284, 164 29 KISTA Telefon: 08 - 444 14 00. E-post: sek@elstandard.se. Internet: www.elstandard.se Explosiv atmosfr Del 29-3: Gasdetektorer (gasvarnare) Vgledning betrffande fasta system av betydelse fr skerheten Explosive atmospheres Part 29-3: Gas detectors Guidance on functional safety of fixed gas detection systems Som svensk standard gller europastandarden EN 60079-29-3:2014. Den svenska standarden innehller den officiella engelska sprkversionen av EN 60079-29-3:2014. Nationellt frord Europastandarden EN 60079-29-3:2014 bestr av: europastandardens ikraftsttningsdokument, utarbetat inom CENELEC IEC 60079-29-3, First edition, 2014 -Explosive atmospheres - Part 29-3: Gas detectors - Guidance on functional safety of fixed gas detection systems utarbetad inom International Electrotechnical Commission, IEC. Standarder underlttar utvecklingen och hjer elskerhetenDet fnns mnga frdelar med att ha gemensamma tekniska regler fr bl a mtning, skerhet och provning och fr utfrande, sktsel och dokumentation av elprodukter och elanlggningar. Genom att utforma sdana standarder blir skerhetsfordringar tydliga och utvecklingskostnaderna rimliga samtidigt som marknadens acceptans fr produkten eller tjnsten kar. Mnga standarder inom elomrdet beskriver tekniska lsningar och metoder som stadkommer den elskerhet som freskrivs av svenska myndigheter och av EU. 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Du som vill dra nytta av dessa mjligheter r vlkommen att kontakta SEKs kansli fr mer information.SEK Svensk ElstandardBox 1284164 29 KistaTel 08-444 14 00www.elstandard.se EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60079-29-3 June 2014 ICS 29.260.20English Version Explosive atmospheres - Part 29-3: Gas detectors - Guidance on functional safety of fixed gas detection systems (IEC 60079-29-3:2014) Atmosphres explosives - Partie 29-3: Dtecteurs de gaz - Recommandations relatives la scurit fonctionnelle des systmes fixes de dtection de gaz (CEI 60079-29-3:2014) Explosionsfhige Atmosphre - Teil 29-3: Gasmessgerte - Leitfaden zur funktionalen Sicherheit von ortsfesten Gaswarnsystemen (IEC 60079-29-3:2014) This European Standard was approved by CENELEC on 2014-05-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical StandardizationComit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung CEN-CENELEC Management Centre: Avenue Marnix 17,B-1000 Brussels 2014 CENELECAll rights of exploitation in any form and by any means reserved worldwide for CENELEC Members. Ref. No. EN 60079-29-3:2014 E SEK Svensk ElstandardEN 60079-29-3:2014- 2 - Foreword Thetextofdocument31/1105A/FDIS,futureedition1ofIEC 60079-29-3,preparedbyIEC TC 31, Equipmentforexplosiveatmospheres,wassubmittedtotheIEC-CENELECparallelvoteandapproved by CENELEC as EN 60079-29-3:2014. The following dates are fixed: latest date by which the document has to be implemented at national level by publication of an identical national standard or by endorsement (dop)2015-02-01 latest date by which the national standards conflicting with the document have to be withdrawn (dow)2017-05-01 This part of IEC 60079-29 is to be used in conjunction with the following standards: IEC 60079-0, Explosive atmospheres Part 0: Equipment General requirements IEC 60079-29-1, Explosive atmospheres Part 29-1: Gas detectors Performance requirements of detectors for flammable gases IEC 60079-29-2, Explosive atmospheres Part 29-2: Gas detectors Selection, installation, use and maintenance of detectors for flammable gases and oxygen IEC 60079-29-4, Explosive atmospheres Part 29-4: Gas detectors Performance requirements of open path detectors for flammable gases Attentionisdrawntothepossibilitythatsomeoftheelementsofthisdocumentmaybethesubjectof patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such patent rights. Endorsement notice The text of the International Standard IEC 60079-29-3:2014 was approved by CENELEC as a European Standard without any modification. In the official version, for Bibliography, the following notes have to be added for the standards indicated: IEC 60079-1NOTEHarmonised as EN 60079-10-1. IEC 61511-1NOTEHarmonised as EN 61511-1. IEC 61511-2NOTEHarmonised as EN 61511-2. IEC 61511-3NOTEHarmonised as EN 61511-3. SEK Svensk Elstandard- 3 -EN 60079-29-3:2014 Annex ZA (normative) Normative references to international publications with their corresponding European publications The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant EN/HD applies. NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here: www.cenelec.eu PublicationYearTitleEN/HDYear IEC 60079-29-1 (mod) -Explosive atmospheres -- Part 29-1: Gas detectors - Performance requirements of detectors for flammable gases EN 60079-29-1- +AAIEC 60079-29-22007 Explosive atmospheres -- Part 29-2: Gas detectors - Selection, installation, use and maintenance of detectors for flammable gases and oxygen EN 60079-29-22007 +EN 60079-29-2:2007/corrigendum Dec. 2007 2007IEC 60079-29-4 (mod) -Explosive atmospheres -- Part 29-4: Gas detectors - Performance requirements of open path detectors for flammable gases EN 60079-29-4- +AAIEC 61508series Functional safety of electrical/electronic/programmable electronic safety-related systems EN 61508series SEK Svensk Elstandard 2 IEC 60079-29-3:2014 IEC 2014 CONTENTS FOREWORD ........................................................................................................................... 5 INTRODUCTION ..................................................................................................................... 7 1Scope ............................................................................................................................ 10 2Normative references .................................................................................................... 11 3Terms and definitions .................................................................................................... 11 4Requirements ................................................................................................................ 13 4.1General ............................................................................................................ 13 4.2Demand rate .................................................................................................... 13 5Gas detection unique features ....................................................................................... 13 5.1Objective ......................................................................................................... 13 5.2Features .......................................................................................................... 14 General .......................................................................................... 145.2.1Sensor location ............................................................................... 145.2.2Sensor filter elements (passive) ...................................................... 145.2.3Sensor filter elements (active) ........................................................ 145.2.4Sensor principles ............................................................................ 145.2.5Poisoning and adverse chemical reaction ....................................... 155.2.6ppm.hr or %vol.hr lifetime ............................................................... 155.2.7Negative gas readings .................................................................... 155.2.8Hazard and risk analysis ................................................................. 155.2.9Preventative effectiveness or mitigation effectiveness .................... 165.2.10Cross sensitivities ........................................................................... 165.2.11Special states ................................................................................. 165.2.12Metrological performance standards ............................................... 165.2.13Fault signal handling ....................................................................... 165.2.14Over-range indication ..................................................................... 165.2.15Surrogate calibration ...................................................................... 165.2.16Maximum/minimum alarm set points ............................................... 175.2.176Functional safety management ...................................................................................... 17 6.1Objective ......................................................................................................... 17 6.2Requirements .................................................................................................. 17 6.3Competence .................................................................................................... 18 7General requirements .................................................................................................... 19 7.1Objective ......................................................................................................... 19 7.2Requirements .................................................................................................. 19 General .......................................................................................... 197.2.1Safety and non safety functions ...................................................... 197.2.2Safety functions of different integrity targets ................................... 197.2.3Behaviour under dangerous failure conditions................................. 197.2.4Behaviour under safe failure conditions .......................................... 207.2.5Behaviour under special state conditions ........................................ 207.2.6Power supply .................................................................................. 217.2.7Gas detector ................................................................................... 217.2.8Gas detection control unit (logic solver) .......................................... 217.2.9Final element (actuator) .................................................................. 227.2.10Visual indication ............................................................................. 227.2.11SEK Svensk ElstandardIEC 60079-29-3:2014 IEC 2014 3 Switching outputs ........................................................................... 227.2.12Protocol outputs ............................................................................. 247.2.13Protocol inputs ................................................................................ 247.2.14System architecture, PFD and PFH values ..................................... 247.2.158Gas detection unique requirements ............................................................................... 24 8.1Objectives ........................................................................................................ 24 8.2Requirements .................................................................................................. 25 Introduction to gas sampling ........................................................... 258.2.1Gas sampling.................................................................................. 258.2.2Gas multiplexer .............................................................................. 268.2.3Gas multiplexer control system ....................................................... 278.2.4Conditioning of measured gas ........................................................ 278.2.5Gas sampling by diffusion mode ..................................................... 288.2.6Automatic calibration and adjustment.............................................. 288.2.7Automatic calibration and adjustment control system ...................... 298.2.89Alternative control units (logic solvers) .......................................................................... 30 9.1Objectives ........................................................................................................ 30 9.2Requirements .................................................................................................. 30 Performance (metrological) ............................................................. 309.2.1Programming of logic ...................................................................... 309.2.210Factory acceptance testing ............................................................................................ 30 10.1Objectives ........................................................................................................ 30 10.2Requirements .................................................................................................. 30 Planning ......................................................................................... 3010.2.1Execution ....................................................................................... 3110.2.211Installation and commissioning ...................................................................................... 31 11.1Objectives ........................................................................................................ 31 11.2Requirements .................................................................................................. 32 Planning ......................................................................................... 3211.2.1Execution ....................................................................................... 3211.2.212System validation .......................................................................................................... 33 12.1Objectives ........................................................................................................ 33 12.2Requirements .................................................................................................. 33 Planning ......................................................................................... 3312.2.1Execution ....................................................................................... 3312.2.213Operation and maintenance ........................................................................................... 34 13.1Objectives ........................................................................................................ 34 13.2Requirements .................................................................................................. 34 Planning ......................................................................................... 3413.2.1Execution ....................................................................................... 3413.2.214System modification ...................................................................................................... 35 14.1Objectives ........................................................................................................ 35 14.2Requirements .................................................................................................. 35 Planning ......................................................................................... 3514.2.1Execution ....................................................................................... 3514.2.215System decommissioning .............................................................................................. 36 15.1Objectives ........................................................................................................ 36 15.2Requirements .................................................................................................. 36 SEK Svensk Elstandard 4 IEC 60079-29-3:2014 IEC 2014 Planning ......................................................................................... 3615.2.1Execution ....................................................................................... 3615.2.216Documentation .............................................................................................................. 37 16.1Objectives ........................................................................................................ 37 16.2Requirements .................................................................................................. 37 (informative)Typical Applications .......................................................................... 38Annex AA.1Typical diffusion applications ........................................................................... 39 A.1.1Application 1 ................................................................................... 39 A.1.2Application 2 ................................................................................... 40 A.1.3Application 3 ................................................................................... 40 A.1.4Application 4 ................................................................................... 40 A.2Typical sampling applications ........................................................................... 41 A.2.1Point to Point sampling ................................................................... 41 A.2.2Multi-stream sampling ..................................................................... 42 (informative)Cross references between standards................................................. 43Annex B (informative)Transformation of requirements ......................................................... 44Annex CC.1General ............................................................................................................ 44 C.2SIL capability 1 ................................................................................................ 44 C.2.1Characteristic ................................................................................. 44 C.2.2Transformation ............................................................................... 44 C.3SIL capability 2 ................................................................................................ 44 C.3.1Characteristic ................................................................................. 44 C.3.2Transformation ............................................................................... 45 C.4SIL capability 3 ................................................................................................ 45 C.4.1Characteristic ................................................................................. 45 C.4.2Transformation ............................................................................... 45 Bibliography .......................................................................................................................... 46 Figure 1 Gas Detection System Architecture ........................................................................ 8 Figure 2 Related Safety Instrumented System Standards ................................................... 10 Figure A.1 Gas detection safety loops ................................................................................ 39 Figure A.2 Typical gas detector aspiration configurations ................................................... 41 Figure B.1 Cross references between standards ................................................................ 43 Table 1 Typical Job Descriptions and Most Relevant Clauses .............................................. 9 Table 2 Demand for Functional Safety Management (see IEC 61508-1) ............................. 18 SEK Svensk ElstandardIEC 60079-29-3:2014 IEC 2014 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION ____________ EXPLOSIVE ATMOSPHERES Part 29-3: Gas detectors Guidance onfunctional safety of fixed gas detection systems FOREWORD 1)The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising allnationalelectrotechnicalcommittees(IECNationalCommittees).TheobjectofIECistopromote internationalco-operationonallquestionsconcerningstandardizationintheelectricalandelectronicfields.To thisendandinadditiontootheractivities,IECpublishesInternationalStandards,TechnicalSpecifications, TechnicalReports,PubliclyAvailableSpecifications(PAS)andGuides(hereafterreferredtoasIEC Publication(s)). Their preparationis entrusted to technical committees; any IEC National Committee interested inthesubjectdealtwithmayparticipateinthispreparatorywork.International,governmentalandnon-governmentalorganizationsliaisingwiththeIECalsoparticipateinthispreparation.IECcollaboratesclosel y withtheInternationalOrganizationforStandardization(ISO)inaccordancewithconditionsdeterminedby agreement between the two organizations. 2)The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international consensusofopinionontherelevantsubjectssinceeachtechnicalcommitteehasrepresentationfromall interested IEC National Committees.3)IECPublicationshavetheformofrecommendationsforinternationaluseandareacceptedbyIECNational Committeesinthatsense.WhileallreasonableeffortsaremadetoensurethatthetechnicalcontentofIEC Publicationsisaccurate,IECcannotbeheldresponsibleforthewayinwhichtheyareusedorforany misinterpretation by any end user. 4)Inordertopromoteinternationaluniformity,IECNationalCommitteesundertaketoapplyIECPublications transparentlytothemaximumextentpossibleintheirnationalandregionalpublications.Anydivergence between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter. 5)IECitselfdoesnotprovideanyattestationofconformity.Independentcertificationbodiesprovideconformity assessmentservicesand,insomeareas,accesstoIECmarksofconformity.IECisnotresponsibleforany services carried out by independent certification bodies. 6)All users should ensure that they have the latest edition of this publication. 7)NoliabilityshallattachtoIECoritsdirectors,employees,servantsoragentsincludingindividualexpertsand members of its technical committees and IEC NationalCommittees for anypersonal injury, property damage or otherdamageofanynaturewhatsoever,whetherdirectorindirect,orforcosts(includinglegalfees)and expensesarisingoutofthepublication,useof,orrelianceupon,thisIECPublicationoranyotherIEC Publications.8)AttentionisdrawntotheNormativereferencescitedinthispublication.Useofthereferencedpublicationsis indispensable for the correct application of this publication. 9)AttentionisdrawntothepossibilitythatsomeoftheelementsofthisIECPublicationmaybethesubjectof patent rights. IEC shall not be held responsible for identifying any or all such patent rights. InternationalStandardIEC 60079-29-3hasbeenpreparedbyIECtechnicalcommittee31: Equipment for explosive atmospheres. This part of IEC 60079-29 is to be used in conjunction with the following standards: IEC 60079-0, Explosive atmospheres Part 0: Equipment General requirements IEC 60079-29-1,ExplosiveatmospheresPart29-1:GasdetectorsPerformance requirements of detectors for flammable gases IEC 60079-29-2,ExplosiveatmospheresPart29-2:GasdetectorsSelection, installation, use and maintenance of detectors for flammable gases and oxygen IEC 60079-29-4,ExplosiveatmospheresPart29-4:GasdetectorsPerformance requirements of open path detectors for flammable gases SEK Svensk Elstandard 6 IEC 60079-29-3:2014 IEC 2014 The text of this standard is based on the following documents: FDISReport on voting 31/1105A/FDIS31/1117/RVD Fullinformationonthevotingfortheapprovalofthisstandardcanbefoundinthereporton voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of theIEC 60079 series, under the general title:Explosive atmospheres, can be found on the IEC website. Thecommitteehasdecidedthatthecontentsofthispublicationwillremainunchangeduntil thestabilitydateindicatedontheIECwebsiteunder"http://webstore.iec.ch"inthedata related to the specific publication. At this date, the publication will bereconfirmed, withdrawn, replaced by a revised edition, or amended. IMPORTANT The 'colour inside' logo on the cover page of this publication indicates thatitcontainscolourswhichareconsideredtobeusefulforthecorrect understandingofitscontents.Usersshouldthereforeprintthisdocumentusinga colour printer. SEK Svensk ElstandardIEC 60079-29-3:2014 IEC 2014 7 INTRODUCTION Fixedgasdetectionsystemshavebeenusedformanyyearstoperformsafetyinstrumented functions.Likeanyinstrumentedsystem,afixedgasdetectionsystemcommonlycomprises ofasingleormultiplegasdetectorinput(s),acontrolunitandasingleormultiplefinal element(s)or output(s).Additionalperipheralequipment may beincorporatedinto a fixedgas detectionsysteme.g.agassamplingsystemoragasconditioningsystem.Ifafixedgas detectionsystem,includinganyrelevantperipheralequipmentistobeeffectivelyusedfor safetyinstrumentedfunctions,itisessentialthatthetotalsystemachievescertainminimum standards and performance levels. Itisimportanttounderstandthatthenumberof sensing pointsandtheirappropriate location, theirredundancy,themanagementofregularmaintenance,specificallyresponsecheckingor calibration,andothergasdetectionspecificfeatures(suchasdesignofgassampling systems)arealllikelytohaveafargreatereffectontheintegrityoftheoverallSafety InstrumentedSystem(SIS)thantherequiredSafetyIntegrityLevel(SIL)orSIL-capabilityof anyoftheindividualfunctionalunits.This,however,doesnotexcludetherequirementfor each Safety Instrumented Function (SIF) to have a stand-alone functional integrity.Thisinternationalstandardaddressestheminimumstandardsandperformancelevelsofa fixedgasdetectionsystemwhichisbasedontheuseofelectrical,electronicor programmableelectronicsystems(E/E/PES)foranyapplicationwherethereiseitherarisk reductiontargetstatedorifthegasdetectionsystemisusedasanadditionalsafeguarding system.Thisinternationalstandarddoesnotapplytoportablegasdetectorsorfixedgasdetection systemswhenthereisnoriskreductiontargetstated.However,thisstandardcouldbeused as a best practice document for such devices or systems. The expression gas detection system within this international standard is generic and applies tostandalonefixedgasdetectors,whichmighthavetheirowninternalalarmtriplevelsand switchingoutputsuptocomplexstandalonefixedgasdetectionsystems(AnnexATypical Applications). Thisinternationalstandardtakesintoconsiderationthepossiblecomplexityofthesupply chainwhichagasdetectionmanufacturer,sellerorsystemintegratormightencounterwhich includes, but is not limited to: theuseofstandalonegasdetectorswhichareintegratedintoanoverallsafetysystemby a gas detection equipment manufacturer, seller or system integrator (or equivalent) thedesignanduseoffixedgasdetectionsub-systems,includinganyassociatedand/or peripheral gas detection equipment which are integrated into an overall safety system by a gas detection equipment manufacturer, seller or system integrator (or equivalent) thedesignanduseofacompletefixedgasdetectionsystem,includingassociatedand/or peripheral gas detection equipment which is the overall safety system NOTE1IEC 61508Parts1,2and3coverthedesignofthestand-alonegasdetector,controlunitorfinal element. Guidance on the design of peripheral equipment is included within this international standard. Before thisinternational standard can be applied, it is important to understand and categorise the application of the fixed gas detection system. The three main applications are: as a prevention system the total system or an individual instrumented control loop has a safety function and safety integrity clearly defined. asamitigationsystemthetotalsystemoranindividualinstrumentedcontrolloophasa safety function and safety integrity clearly defined. asanadditionalsafeguardingsystemthiscoversthosefixedgasdetectionsystemsor individualinstrumentedcontrolloopswhichoperateinparallel(secondary)toan SEK Svensk Elstandard 8 IEC 60079-29-3:2014 IEC 2014 instrumentedsafetysystem,wherethedemandonthefixedgasdetectionsystemor individualinstrumentedcontrolloopisonlywhentheprimaryinstrumentedsafetysystem fails or another layer of protection fails. Undernocircumstancesshouldtheuseofanadditionalsafeguardinggasdetectionsystem contributetotheHardwareFaultTolerance(HFT)declarationfortheinstrumentedsafety system. Afixedgasdetectionsystem,asshowninFigure1,mayoperateseveraltimesperyear subjecttotheapplication,thereforethisinternationalstandardacceptsthatthedemandrate associatedwithondemand(lowdemand)shouldbespecifiedinthesafetyrequirements (e.g. a reference could be > 1/yr but