1、 IEC 60079-29-3 Edition 1.0 2014-03 INTERNATIONAL STANDARD NORME INTERNATIONALE Explosive atmospheres Part 29-3: Gas detectors Guidance on functional safety of fixed gas detection systems Atmosphres explosives Partie 29-3: Dtecteurs de gaz Recommandations relatives la scurit fonctionnelle des systme
2、s fixes de dtection de gaz IEC 60079-29-3:2014-03(en-fr) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2014 IEC, Geneva, Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or
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20、9-3: Gas detectors Guidance on functional safety of fixed gas detection systems Atmosphres explosives Partie 29-3: Dtecteurs de gaz Recommandations relatives la scurit fonctionnelle des systmes fixes de dtection de gaz INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATION
21、ALE X ICS 29.260.20 PRICE CODE CODE PRIX ISBN 978-2-8322-1496-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale Warning! Make sure that you obtained this publication from an authorized distributor. Attention! Veuille
22、z vous assurer que vous avez obtenu cette publication via un distributeur agr. colour inside 2 IEC 60079-29-3:2014 IEC 2014 CONTENTS FOREWORD . 5 INTRODUCTION . 7 1 Scope 10 2 Normative references 11 3 Terms and definitions 11 4 Requirements 13 4.1 General 13 4.2 Demand rate 13 5 Gas detection uniqu
23、e features . 13 5.1 Objective . 13 5.2 Features 14 General 14 5.2.1Sensor location . 14 5.2.2Sensor filter elements (passive) 14 5.2.3Sensor filter elements (active) 14 5.2.4Sensor principles 14 5.2.5Poisoning and adverse chemical reaction . 15 5.2.6ppm.hr or %vol.hr lifetime . 15 5.2.7Negative gas
24、readings 15 5.2.8Hazard and risk analysis . 15 5.2.9Preventative effectiveness or mitigation effectiveness 16 5.2.10Cross sensitivities . 16 5.2.11Special states . 16 5.2.12Metrological performance standards . 16 5.2.13Fault signal handling . 16 5.2.14Over-range indication . 16 5.2.15Surrogate calib
25、ration 16 5.2.16Maximum/minimum alarm set points . 17 5.2.17 6 Functional safety management 17 6.1 Objective . 17 6.2 Requirements 17 6.3 Competence 18 7 General requirements 19 7.1 Objective . 19 7.2 Requirements 19 General 19 7.2.1Safety and non safety functions 19 7.2.2Safety functions of differe
26、nt integrity targets . 19 7.2.3Behaviour under dangerous failure conditions. 19 7.2.4Behaviour under safe failure conditions 20 7.2.5Behaviour under special state conditions 20 7.2.6Power supply 21 7.2.7Gas detector . 21 7.2.8Gas detection control unit (logic solver) 21 7.2.9Final element (actuator)
27、 22 7.2.10Visual indication . 22 7.2.11IEC 60079-29-3:2014 IEC 2014 3 Switching outputs . 22 7.2.12Protocol outputs . 24 7.2.13Protocol inputs 24 7.2.14System architecture, PFD and PFH values . 24 7.2.15 8 Gas detection unique requirements . 24 8.1 Objectives 24 8.2 Requirements 25 Introduction to g
28、as sampling . 25 8.2.1Gas sampling 25 8.2.2Gas multiplexer 26 8.2.3Gas multiplexer control system . 27 8.2.4Conditioning of measured gas 27 8.2.5Gas sampling by diffusion mode . 28 8.2.6Automatic calibration and adjustment 28 8.2.7Automatic calibration and adjustment control system 29 8.2.8 9 Altern
29、ative control units (logic solvers) 30 9.1 Objectives 30 9.2 Requirements 30 Performance (metrological) . 30 9.2.1Programming of logic 30 9.2.2 10 Factory acceptance testing 30 10.1 Objectives 30 10.2 Requirements 30 Planning . 30 10.2.1Execution . 31 10.2.2 11 Installation and commissioning 31 11.1
30、 Objectives 31 11.2 Requirements 32 Planning . 32 11.2.1Execution . 32 11.2.2 12 System validation 33 12.1 Objectives 33 12.2 Requirements 33 Planning . 33 12.2.1Execution . 33 12.2.2 13 Operation and maintenance . 34 13.1 Objectives 34 13.2 Requirements 34 Planning . 34 13.2.1Execution . 34 13.2.2
31、14 System modification 35 14.1 Objectives 35 14.2 Requirements 35 Planning . 35 14.2.1Execution . 35 14.2.2 15 System decommissioning 36 15.1 Objectives 36 15.2 Requirements 36 4 IEC 60079-29-3:2014 IEC 2014 Planning . 36 15.2.1Execution . 36 15.2.2 16 Documentation 37 16.1 Objectives 37 16.2 Requir
32、ements 37 (informative) Typical Applications 38 Annex A A.1 Typical diffusion applications . 39 A.1.1 Application 1 . 39 A.1.2 Application 2 . 40 A.1.3 Application 3 . 40 A.1.4 Application 4 . 40 A.2 Typical sampling applications . 41 A.2.1 Point to Point sampling . 41 A.2.2 Multi-stream sampling .
33、42 (informative) Cross references between standards. 43 Annex B(informative) Transformation of requirements . 44 Annex C C.1 General 44 C.2 SIL capability 1 44 C.2.1 Characteristic . 44 C.2.2 Transformation . 44 C.3 SIL capability 2 44 C.3.1 Characteristic . 44 C.3.2 Transformation . 45 C.4 SIL capa
34、bility 3 45 C.4.1 Characteristic . 45 C.4.2 Transformation . 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 C
35、ross 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 IEC 60079-29-3:2014 IEC 2014 5 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ EXPLOSIVE ATMOSPHERES Part 29-3: Gas detectors Guidance
36、on functional safety of fixed gas detection systems FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operatio
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46、is publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 60079-29-3 has been prepared by IEC technical co
47、mmittee 31: 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, Explosive atmospheres Part 29-1: Gas detectors Performance requirements of d
48、etectors 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 flam
49、mable gases 6 IEC 60079-29-3:2014 IEC 2014 The text of this standard is based on the following documents: FDIS Report on voting 31/1105A/FDIS 31/1117/RVD Full information on the voting for the approval of this standard can be found in the report on 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 th
