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BS EN ISO 80079-20-1:2019

BS EN ISO 80079-20-1:2019

$215.11

Explosive atmospheres – Material characteristics for gas and vapour classification. Test methods and data

Published By Publication Date Number of Pages
BSI 2019 94
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This part of ISO/IEC 80079 provides guidance on classification of gases and vapours. It describes a test method intended for the measurement of the maximum experimental safe gaps (MESG) for gas-air mixtures or vapour-air mixtures under normal conditions of temperature and pressure (20 °C, 101,3 kPa) so as to permit the selection of an appropriate group of equipment. This document also describes a test method intended for use in the determination of the auto-ignition temperature (AIT) of a vapour-air mixture or gas-air mixture at atmospheric pressure, so as to permit the selection of an appropriate temperature class of equipment.

Values of chemical properties of materials are provided to assist in the selection of equipment to be used in hazardous areas. Further data may be added as the results of validated tests become available.

The materials and the characteristics included in a table (see Annex B) have been selected with particular reference to the use of equipment in hazardous areas. The data in this document have been taken from a number of references which are given in the bibliography.

These methods for determining the MESG or the AIT may also be used for gas-air-inert mixtures or vapour-air-inert mixtures. However, data on air-inert mixtures are not tabulated.

PDF Catalog

PDF Pages PDF Title
2 undefined
4 European foreword
Endorsement notice
5 Annex ZA
7 English
CONTENTS
10 FOREWORD
12 1 Scope
2 Normative references
3 Terms and definitions
14 4 Classification of gases and vapours
4.1 General
4.2 Classification according to the maximum experimental safe gap (MESG)
15 4.3 Classification according to the minimum igniting current ratio (MIC ratio)
4.4 Classification according to the similarity of chemical structure
4.5 Classification of mixtures of gases
16 5 Data for flammable gases and vapours, relating to the use of equipment
5.1 Determination of the properties
5.1.1 General
5.1.2 Equipment group
5.1.3 Flammable limits
5.1.4 Flash point (FP)
17 5.1.5 Temperature class
5.1.6 Minimum igniting current (MIC)
5.1.7 Auto-ignition temperature (AIT)
5.2 Properties of particular gases and vapours
5.2.1 Coke oven gas
5.2.2 Ethyl nitrite
5.2.3 MESG of carbon monoxide
Tables
Table 1 − Classification of temperature class and range of auto-ignition temperatures
18 5.2.4 Methane, Equipment Group IIA
6 Method of test for the maximum experimental safe gap (MESG)
6.1 Outline of method
6.2 Test apparatus
6.2.1 General
Figures
Figure 1 − Test apparatus
19 6.2.2 Material and mechanical strength
6.2.3 Exterior chamber
6.2.4 Interior chamber
6.2.5 Gap adjustment
6.2.6 Injection of mixture
6.2.7 Position of ignition source
6.3 Procedure
6.3.1 Preparation of gas mixtures
6.3.2 Temperature and pressure
20 6.3.3 Gap adjustment
6.3.4 Ignition
6.3.5 Observation of the ignition process
6.4 Determination of maximum experimental safe gap (MESG)
6.4.1 General
6.4.2 Preliminary tests
6.4.3 Confirmatory tests
6.4.4 Reproducibility of maximum experimental safe gaps (MESG)
21 6.4.5 Tabulated values
6.5 Verification of the MESG determination method
7 Method of test for auto-ignition temperature (AIT)
7.1 Outline of method
7.2 Apparatus
7.2.1 General
Table 2 − Values for verification of the apparatus
22 7.2.2 Test vessel and support
7.2.3 Thermocouples
7.2.4 Oven
23 7.2.5 Metering devices
7.2.6 Mirror
7.2.7 Timer
7.2.8 Equipment for purging the test vessel with air
7.2.9 Automated apparatus
24 7.3 Sampling, preparation and preservation of test samples
7.3.1 Sampling
7.3.2 Preparation and preservation
7.4 Procedure
7.4.1 General
25 7.4.2 Sample injection
7.4.3 Determination of the auto-ignition temperature (AIT)
26 7.5 Auto-ignition temperature (AIT)
7.6 Validity of results
7.6.1 Repeatability
7.6.2 Reproducibility
27 7.7 Data
7.8 Verification of the auto-ignition temperature determination method
Table 3 − Values for verification of the apparatus
28 Annex A (normative)Ovens of test apparatus for the tests of auto-ignition temperature
29 Figure A.1 − Test apparatus: assembly
30 Figure A.2 − Section A-A (flask omitted)
Figure A.3 − Base heater (board made of refractory material)
31 Figure A.4 − Flask guide ring (board made of refractory material)
Figure A.5 − Neck heater (board made of refractory material)
32 Figure A.6 − Oven
33 Figure A.7 − Lid of steel cylinder
34 Figure A.8 − Lid of steel cylinder
Figure A.9 − Injection of gaseous sample
35 Annex B (informative)Tabulated values
37 Table B.1 − Material data
89 Annex C (informative)Determination of cool flames
Figure C.1 − Additional thermocouple to detect cool flames
90 Figure C.2 − ‘Negative temperature coefficient’ shown for butyl butyrate as an example
91 Annex D (informative)Volume dependence of auto-ignition temperature
Figure D.1 − Volume dependence of auto-ignition temperature
92 Bibliography

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BS EN ISO 80079-20-1:2019
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