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BS EN ISO/IEC 80079-20-2:2016:2018 Edition

BS EN ISO/IEC 80079-20-2:2016:2018 Edition

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Explosive atmospheres – Material characteristics. Combustible dusts test methods

Published By Publication Date Number of Pages
BSI 2018 54
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This part of ISO/IEC 80079 describes the test methods for the identification of combustible dust and combustible dust layers in order to permit classification of areas where such materials exist for the purpose of the proper selection and installation of electrical and mechanical equipment for use in the presence of combustible dust.

The standard atmospheric conditions for determination of characteristics of combustible dusts are:

  • temperature –20 °C to +60 °C,

  • pressure 80 kPa (0,8 bar) to 110 kPa (1,1 bar) and

  • air with normal oxygen content, typically 21 % v/v.

The test methods defined do not apply to:

  • recognized explosives, propellants (e.g. gunpowder, dynamite), or substances or mixtures of substances which may, under some circumstances, behave in a similar manner or

  • dusts of explosives and propellants that do not require atmospheric oxygen for combustion, or to pyrophoric substances.

PDF Catalog

PDF Pages PDF Title
2 undefined
9 English
CONTENTS
12 FOREWORD
15 1 Scope
2 Normative references
3 Terms and definitions
16 4 Dust sample requirements
4.1 Receipt of sample for testing
4.2 Characterisation of sample
17 4.3 Preparation of sample
4.4 Test conditions
5 Combustible dusts and combustible flyings determination
5.1 Test sequence
5.2 Tests to determine whether material is a combustible dust or combustible flying
5.2.1 Visual inspection
18 5.2.2 Determine particle distribution
5.2.3 Ignition test in the Hartmann tube
5.2.4 Ignition test in the 20-litre sphere
6 Procedure for characterisation of combustible dust or combustible flying
19 Figures
Figure 1 – Protocol for characterisation of combustible dust or combustible flying
20 Figure 2 – Tests to define ability to form explosive dust atmosphere (combustible dust/combustible flyings)
21 7 Test methods for determination of whether a material is a combustible dust or a combustible flying
7.1 Modified Hartmann tube
7.1.1 General
7.1.2 Test equipment
Figure 3 – Tests to characterise combustible dust or combustible flying
22 7.1.3 Test procedure
7.2 20-litre sphere
7.2.1 General
7.2.2 Test equipment
23 7.2.3 Test procedure
7.3 Alternative method to 20-litre sphere for small test material quantities
7.3.1 General
24 7.3.2 Test equipment
7.3.3 Test procedure
8 Test methods for combustible dust determinations
8.1 MIT of a dust cloud
8.1.1 General
8.1.2 GG furnace
25 8.1.3 BAM furnace
26 8.2 Test for MIT of dust layer
8.2.1 General
8.2.2 Heated surface
27 8.2.3 Dust layers
8.2.4 Dust layer temperature
8.2.5 Ambient temperature measurements
8.2.6 Dust layer temperature test method
28 8.2.7 Recording of results
Tables
Table 1 – Example of ignition test report
29 8.3 Method for determining minimum ignition energy of dust/air mixtures
8.3.1 General
8.3.2 Test equipment
30 8.3.3 Test procedure
Figure 4 – Modified Hartmann tube
31 8.3.4 Calibration for determination of minimum ignition energies (MIE) by electrically generated high-voltage d.c. sparks
8.3.5 Recording of test results
8.4 Test on resistivity
8.4.1 General
32 8.4.2 Test equipment
8.4.3 Test procedure
Figure 5 – Measuring cell for powder resistivity
33 8.4.4 Recording of test results
9 Test report
34 Annexes
Annex A (normative) Measurement of temperature distribution on the surface of the hot plate
Figure A.1 – Typical surface temperature distribution (method A)
35 Annex B (informative) Godbert-Greenwald oven (GG)
Figure B.1 – Vertical cross-section through the Godbert-Greenwald oven
36 Annex C (informative) Examples of spark-generating systems
C.1 General
Figure C.1 – Circuit – Triggering by high-voltage relay, using a two-electrode system
37 C.2 Triggering by auxiliary spark using three-electrode system
Figure C.2 – Apparatus for determining the minimum ignition energies of dust (schematic) – Triggering by auxiliary spark using three-electrode system
38 C.3 Triggering by electrode movement
Figure C.3 – Apparatus for determining the minimum ignition energiesof dust (schematic) – Triggering by electrode movement
39 C.4 Triggering by voltage increase (trickle-charging circuit)
Figure C.4 – Apparatus for determining the minimum ignition energies of dust (schematic) – Triggering by voltage increase
40 C.5 Triggering by auxiliary spark, using normal two-electrode system – Trigger transformer in discharge circuit
Figure C.5 – Apparatus for determining the minimum ignition energies for dust (schematic) – Trigger transformer in discharge circuit
41 Annex D (normative) Vertical tube (modified Hartmann tube) apparatus
Figure D.1 – Vertical tube apparatus (modified Hartmann tube)
42 Annex E (informative) 20-litre sphere
Figure E.1 – Test equipment 20-litre sphere (schematic)
43 Figure E.2 – Cross-sectional view of rebound nozzle
Figure E.3 – Plan view of rebound nozzle
Figure E.4 – Cross-sectional view of dispersion cup
44 Annex F (informative) BAM oven
Figure F.1 – Cross-sectional arrangement of BAM oven
45 Annex G (informative) Data for dust explosion characteristics
46 Annex H (informative) 1 m3 vessel
H.1 Test principle
H.2 Test apparatus
47 Figure H.1 – 1 m3 vessel (schematic)
48 Figure H.2 – Location of the 6 mm holes in the semicircular dust dispenser
49 Figure H.3 – Rebound nozzle
50 H.3 Test conditions
H.4 Test procedure
Figure H.4 – Dispersion cup
52 Bibliography

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