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BS EN 60079-29-3:2014

BS EN 60079-29-3:2014

$198.66

Explosive atmospheres – Gas detectors. Guidance on functional safety of fixed gas detection systems

Published By Publication Date Number of Pages
BSI 2014 54
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IEC 60079-29-3:2014 gives guidance for the design and implementation of a fixed gas detection system, including associated and/or peripheral gas detection equipment, for the detection of flammable gases/vapours and oxygen when used in a safety-related application in accordance with IEC 61508 and IEC 61511. This International standard also applies to the detection of toxic gases. Other parts of this international standard and pertinent local, national and international standards separately specify the performance requirements of a gas detector and a gas detection control unit (logic solver). These standards are commonly known as Metrological Performance Standards and are concerned with the accuracy of the measured value, the overall system performance, but not the device or system integrity with respect to the safety function. This international standard applies to the integrity of the safety function. Keywords: fixed gas detection system, flammable gases/vapours and Oxygen, detection of toxic gases This publication is to be read in conjunction with /2, /2, /2 and /2

PDF Catalog

PDF Pages PDF Title
7 English
CONTENTS
10 FOREWORD
12 INTRODUCTION
13 Figures
Figure 1 – Gas Detection System Architecture
14 Tables
Table 1 – Typical Job Descriptions and Most Relevant Clauses
15 1 Scope
Figure 2 – Related Safety Instrumented System Standards
16 2 Normative references
3 Terms and definitions
18 4 Requirements
4.1 General
4.2 Demand rate
5 Gas detection unique features
5.1 Objective
19 5.2 Features
5.2.1 General
5.2.2 Sensor location
5.2.3 Sensor filter elements (passive)
5.2.4 Sensor filter elements (active)
5.2.5 Sensor principles
20 5.2.6 Poisoning and adverse chemical reaction
5.2.7 ppm.hr or %vol.hr lifetime
5.2.8 Negative gas readings
5.2.9 Hazard and risk analysis
21 5.2.10 Preventative effectiveness or mitigation effectiveness
5.2.11 Cross sensitivities
5.2.12 Special states
5.2.13 Metrological performance standards
5.2.14 Fault signal handling
5.2.15 Over-range indication
5.2.16 Surrogate calibration
22 5.2.17 Maximum/minimum alarm set points
6 Functional safety management
6.1 Objective
6.2 Requirements
23 6.3 Competence
Table 2 – Demand for Functional Safety Management (see IEC 61508-1)
24 7 General requirements
7.1 Objective
7.2 Requirements
7.2.1 General
7.2.2 Safety and non safety functions
7.2.3 Safety functions of different integrity targets
7.2.4 Behaviour under dangerous failure conditions
25 7.2.5 Behaviour under safe failure conditions
7.2.6 Behaviour under special state conditions
26 7.2.7 Power supply
7.2.8 Gas detector
7.2.9 Gas detection control unit (logic solver)
27 7.2.10 Final element (actuator)
7.2.11 Visual indication
7.2.12 Switching outputs
29 7.2.13 Protocol outputs
7.2.14 Protocol inputs
7.2.15 System architecture, PFD and PFH values
8 Gas detection unique requirements
8.1 Objectives
30 8.2 Requirements
8.2.1 Introduction to gas sampling
8.2.2 Gas sampling
31 8.2.3 Gas multiplexer
32 8.2.4 Gas multiplexer control system
8.2.5 Conditioning of measured gas
33 8.2.6 Gas sampling by diffusion mode
8.2.7 Automatic calibration and adjustment
34 8.2.8 Automatic calibration and adjustment control system
35 9 Alternative control units (logic solvers)
9.1 Objectives
9.2 Requirements
9.2.1 Performance (metrological)
9.2.2 Programming of logic
10 Factory acceptance testing
10.1 Objectives
10.2 Requirements
10.2.1 Planning
36 10.2.2 Execution
11 Installation and commissioning
11.1 Objectives
37 11.2 Requirements
11.2.1 Planning
11.2.2 Execution
38 12 System validation
12.1 Objectives
12.2 Requirements
12.2.1 Planning
12.2.2 Execution
39 13 Operation and maintenance
13.1 Objectives
13.2 Requirements
13.2.1 Planning
13.2.2 Execution
40 14 System modification
14.1 Objectives
14.2 Requirements
14.2.1 Planning
14.2.2 Execution
41 15 System decommissioning
15.1 Objectives
15.2 Requirements
15.2.1 Planning
15.2.2 Execution
42 16 Documentation
16.1 Objectives
16.2 Requirements
43 Annex A (informative) Typical Applications
44 Figure A.1 – Gas detection safety loops
46 Figure A.2 – Typical gas detector aspiration configurations
48 Annex B (informative) Cross references between standards
Figure B.1 – Cross references between standards
49 Annex C (informative) Transformation of requirements
51 Bibliography

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BS EN 60079-29-3:2014
$198.66