SIST EN ISO/IEC 80079-20-2:2016
(Main)Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods (ISO/IEC 80079-20-2:2016)
Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test methods (ISO/IEC 80079-20-2:2016)
This standard describes the test methods for determining whether a material exhibits properties to be considered to be combustible dust and for determining the characteristics of combustible dusts.
This test method is applicable to the identification and classification of areas where explosive dust atmospheres and combustible dust layers are present, in order to permit the proper assessment of potential equipment ignition sources that must be used in the construction and application of equipment for use in the presence of combustible dust.
The test methods defined do not apply to:
– recognized explosives, gunpowder, dynamite, or substances or mixtures of substances which may, under some circumstances, behave in a similar manner; or
– dusts of explosives that do not require atmospheric oxygen for combustion, or to pyrophoric substances
Explosionsfähige Atmosphären - Teil 20-2: Werkstoffeigenschaften - Prüfverfahren für brennbare Stäube (ISO/IEC 80079-20-2:2016)
Dieser Teil von ISO/IEC 80079 beschreibt die Prüfverfahren für die Identifizierung von brennbarem Staub und Ablagerungen brennbarer Stäube, um die Klassifizierung von Bereichen, in denen solche Stoffe vorkommen, zum Zweck der Auswahl und Montage von elektrischen und mechanischen Ausrüstungen, die für die Verwendung in Gegenwart von brennbarem Staub geeignet sind, zu ermöglichen.
Die atmosphärischen Normzustände zur Bestimmung der Eigenschaften von brennbaren Stäuben sind
— Temperatur −20 °C bis +60 °C,
— Druck 80 kPa (0,8 bar) bis 110 kPa (1,1 bar) und
— Luft mit normalem Sauerstoffgehalt, typischerweise 21 % v/v.
Die definierten Prüfverfahren sind nicht anwendbar auf
— anerkannte Sprengstoffe, Treibstoffe (z. B. Schießpulver, Dynamit) oder auf Stoffe und Stoffgemische, die sich unter Umständen ähnlich verhalten können oder
— Stäube von Sprengstoffen und Treibstoffen, die keinen atmosphärischen Sauerstoff zur Verbrennung benötigen oder auf pyrophore Stoffe.
Atmosphères explosives - Partie 20-2: Caractéristiques des produits - Méthodes d'essai des poussières combustibles (ISO/IEC 80079-20-2:2016)
Eksplozivne atmosfere - 20-2. del: Lastnosti materiala - Metode preskušanja gorljivega prahu (ISO/IEC 80079-20-2:2016)
Ta standard opisuje preskusne metode za ugotavljanje, ali so za material značilne lastnosti, ki se upoštevajo kot gorljiv prah, in za ugotavljanje lastnosti gorljivih prahov. Ta preskusna metoda se uporablja za določanje in razvrščanje območij, v katerih so prisotne eksplozivne prašne atmosfere in gorljive plasti prahu, da se omogoči ustrezna ocena potencialnih virov vžiga opreme, ki jih je treba uporabljati pri konstrukciji in uporabi opreme, ki se uporablja v prisotnosti gorljivega prahu. Opredeljene preskusne metode se ne uporabljajo za: – znane eksplozive, smodnik, dinamit ali snovi ali mešanice snovi, ki lahko v nekaterih okoliščinah delujejo podobno; ali – prah eksplozivov, ki za gorenje ne potrebuje atmosferskega kisika, ali piroforne snovi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO/IEC 80079-20-2:2016
01-julij-2016
1DGRPHãþD
SIST EN 13821:2003
Eksplozivne atmosfere - 20-2. del: Lastnosti materiala - Metode preskušanja
gorljivega prahu (ISO/IEC 80079-20-2:2016)
Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test
methods (ISO/IEC 80079-20-2:2016)
Explosionsfähige Atmosphären - Teil 20-2: Werkstoffeigenschaften - Prüfverfahren für
brennbare Stäube (ISO/IEC 80079-20-2:2016)
Atmosphères explosives - Partie 20-2: Caractéristiques des produits - Méthodes d'essai
des poussières combustibles (ISO/IEC 80079-20-2:2016)
Ta slovenski standard je istoveten z: EN ISO/IEC 80079-20-2:2016
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
13.230 Varstvo pred eksplozijo Explosion protection
SIST EN ISO/IEC 80079-20-2:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO/IEC 80079-20-2:2016
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2016
EUROPÄISCHE NORM
ICS 29.260.20 Supersedes EN 61241-2-2:1995
English Version
Explosive atmospheres - Part 20-2: Material
characteristics - Combustible dusts test methods (ISO/IEC
80079-20-2:2016)
Atmosphères explosives - Partie 20-2: Caractéristiques Explosionsfähige Atmosphären - Teil 20-2:
des produits - Méthodes d'essai des poussières Werkstoffeigenschaften - Prüfverfahren für brennbare
combustibles (ISO/IEC 80079-20-2:2016) Stäube (ISO/IEC 80079-20-2:2016)
This European Standard was approved by CEN on 18 February 2016.
CEN 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 CEN
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 CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/IEC 80079-20-2:2016 E
worldwide for CEN national Members.
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU . 4
Annex ZB (informative) Significant changes with respect to IEC 61241-2-1:1994, EN 61241-
2-2:1993 and IEC 61241-2-3:1994 . 5
2
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
European foreword
This document (EN ISO/IEC 80079-20-2:2016) has been prepared by Technical Committee ISO/TMBG
"Technical Management Board - groups" in collaboration with Technical Committee CEN/TC 305
“Potentially explosive atmospheres - Explosion prevention and protection” the secretariat of which is
held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2016, and conflicting national standards
shall be withdrawn at the latest by September 2016.
The significant changes with respect to EN 61241-2:1995 are included in Annex ZB “Significant changes
with respect to IEC 61241-2-1:1994, IEC 61241-2-2:1993 and IEC 61241-2-3:1994".
This document supersedes EN 61241-2-2:1995.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of 2014/34/EU.
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this
document.
Extensions to the marking scheme described in the Directive are found in the ATEX Guidelines
published by the European Commission. These are particularly useful for equipment that conforms to
more than one category.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO/IEC 80079-20-2:2016 has been approved by CEN as EN ISO/IEC 80079-20-2:2016
without any modification.
3
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Annex ZA
(informative)
Relationship between this European Standard and the Essential
Requirements of EU Directive 2014/34/EU
This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association to provide a means of conforming to Essential
Requirements of the New Approach Directive 2014/34/EU.
Once this standard is cited in the Official Journal of the European Union under that Directive and has
been implemented as a national standard in at least one Member State, compliance with the clauses of
this standard given in table ZA confers, within the limits of the scope of this standard, a presumption of
conformity with the corresponding Essential Requirements of that Directive and associated EFTA
regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU
Clause(s)/sub-clause(s) of this Essential Requirements (ERs) Qualifying remarks/Notes
EN of Directive 2014/34/EU
5, 6, Annex G Annex II, Clause 1.01; 1.0.6a;
1.0.6b; 1.2.1; 1.2.4; 1.5.7
WARNING — Other requirements and other EU Directives may be applicable to the product(s) falling
within the scope of this standard.
4
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Annex ZB
(informative)
Significant changes with respect to IEC 61241-2-1:1994, EN 61241-2-2:1993
and IEC 61241-2-3:1994
This European Standard supersedes IEC 61241-2-1:1994, EN 61241-2-2:1993 and IEC 61241-2-3:1994
Table ZB.1 — Significant changes with respect to IEC 61241-2-1:1994, EN 61241-2-2:1993 and
IEC 61241-2-3:1994
Type
Explanation of the significance of the Clause Minor and Extension Major
changes editorial technical
changes changes
Normative references 2 X
Terms and Definitions 3 X
Dust sample Requirements 4 X
Combustible Dust Determination 5 X
Procedure for Characterisation of 6 X
combustible dust or combustible flying
Test methods for determination of a 7 X
combustible dust or a combustible flying
MIT of a dust cloud 8.1 X
MIT of a dust layer 8.2 X
MIE of a dust/air mixture 8.3 X
Tests on resistivity 8.4 X
Measurement of temperature Annex X
distribution on the surface of the hot A
plate
Godbert-Greenwald oven Annex X
B
Examples of spark-generating systems Annex X
C
5
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Table ZB.1 (continued)
Type
Explanation of the significance Clause Minor and editorial Extension Major technical
of the changes changes changes
Vertical tube apparatus Annex X
D
20-litre sphere Annex X
E
BAM oven Annex X
F
Data for dust explosion Annex X
characteristics G
3
1m vessel Annex X
H
NOTE 1 The technical changes referred to include the significant technical changes from the revised EN but this
is not an exhaustive list of all modifications from the previous version.
Explanations:
A) Definitions
Minor and editorial changes clarification
decrease of technical requirements
minor technical change
editorial corrections
Changes in a standard classified as ‘Minor and editorial changes’ refer to changes regarding the
previous standard, which modify requirements in an editorial or a minor technical way. Also changes of
the wording to clarify technical requirements without any technical change are classified as ‘Minor and
editorial changes’.
A reduction in level of existing requirement is also classified as ‘Minor and editorial changes’
Extension addition of technical options
Changes in a standard classified as ‘extension’ refers to changes regarding the previous standard, which
add new or modify existing technical requirements, in a way that new options are given, but without
increasing requirements for equipment that was fully compliant with the previous standard. Therefore
these ‘extensions’ will not have to be considered for products in conformity with the preceding edition.
Major technical changes addition of technical requirements
increase of technical requirements
6
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SIST EN ISO/IEC 80079-20-2:2016
EN ISO/IEC 80079-20-2:2016 (E)
Changes in a standard classified as ‘Major technical change’ refer to changes regarding the previous
standard, which add new or increase the level of existing technical requirements, in a way that a
product in conformity with the preceding standard will not always be able to fulfil the requirements
given in the standard. ‘Major technical changes’ have to be considered for products in conformity with
the preceding edition. For every change classified as ‘Major Technical Change’ additional information is
provided in clause B) of the Annex ZB.
1
NOTE 2 These changes represent current technological knowledge . However, these changes should not
normally have an influence on equipment already placed on the market.
B) Information about the background of ‘Major Technical Changes’
None
1
see also ATEX Guideline 10.3 and Annex ZA
7
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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2
Edition 1.0 2016-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Explosive atmospheres –
Part 20-2: Material characteristics – Combustible dusts test methods
Atmosphères explosives –
Partie 20-2: Caractéristiques des produits – Méthodes d’essai des poussières
combustibles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.230; 29.260.20 ISBN 978-2-8322-3179-1
Warning! Make sure that you obtained this publication from an authorized distributor.
Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.
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SIST EN ISO/IEC 80079-20-2:2016
– 2 – ISO/IEC 80079-20-2:2016
ISO/IEC 2016
CONTENTS
FOREWORD . 5
1 Scope . 8
2 Normative references. 8
3 Terms and definitions . 8
4 Dust sample requirements . 9
4.1 Receipt of sample for testing . 9
4.2 Characterisation of sample . 9
4.3 Preparation of sample . 10
4.4 Test conditions . 10
5 Combustible dusts and combustible flyings determination . 10
5.1 Test sequence . 10
5.2 Tests to determine whether material is a combustible dust or combustible
flying . 10
5.2.1 Visual inspection . 10
5.2.2 Determine particle distribution . 11
5.2.3 Ignition test in the Hartmann tube . 11
5.2.4 Ignition test in the 20-litre sphere . 11
6 Procedure for characterisation of combustible dust or combustible flying . 11
7 Test methods for determination of whether a material is a combustible dust or a
combustible flying . 14
7.1 Modified Hartmann tube . 14
7.1.1 General . 14
7.1.2 Test equipment . 14
7.1.3 Test procedure . 15
7.2 20-litre sphere . 15
7.2.1 General . 15
7.2.2 Test equipment . 15
7.2.3 Test procedure . 16
7.3 Alternative method to 20-litre sphere for small test material quantities . 16
7.3.1 General . 16
7.3.2 Test equipment . 17
7.3.3 Test procedure . 17
8 Test methods for combustible dust determinations . 17
8.1 MIT of a dust cloud . 17
8.1.1 General . 17
8.1.2 GG furnace . 17
8.1.3 BAM furnace . 18
8.2 Test for MIT of dust layer . 19
8.2.1 General . 19
8.2.2 Heated surface . 19
8.2.3 Dust layers . 20
8.2.4 Dust layer temperature . 20
8.2.5 Ambient temperature measurements . 20
8.2.6 Dust layer temperature test method . 20
8.2.7 Recording of results . 21
8.3 Method for determining minimum ignition energy of dust/air mixtures . 22
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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2:2016 – 3 –
ISO/IEC 2016
8.3.1 General . 22
8.3.2 Test equipment . 22
8.3.3 Test procedure . 23
8.3.4 Calibration for determination of minimum ignition energies (MIE) by
electrically generated high-voltage d.c. sparks . 24
8.3.5 Recording of test results . 24
8.4 Test on resistivity . 24
8.4.1 General . 24
8.4.2 Test equipment . 25
8.4.3 Test procedure . 25
8.4.4 Recording of test results . 26
9 Test report. 26
Annex A (normative) Measurement of temperature distribution on the surface of the
hot plate . 27
Annex B (informative) Godbert-Greenwald oven (GG) . 28
Annex C (informative) Examples of spark-generating systems . 29
C.1 General . 29
C.2 Triggering by auxiliary spark using three-electrode system . 30
C.3 Triggering by electrode movement . 31
C.4 Triggering by voltage increase (trickle-charging circuit) . 32
C.5 Triggering by auxiliary spark, using normal two-electrode system – Trigger
transformer in discharge circuit . 33
Annex D (normative) Vertical tube (modified Hartmann tube) apparatus . 34
Annex E (informative) 20-litre sphere . 35
Annex F (informative) BAM oven . 37
Annex G (informative) Data for dust explosion characteristics . 38
3
Annex H (informative) 1 m vessel . 39
H.1 Test principle . 39
H.2 Test apparatus . 39
H.3 Test conditions . 43
H.4 Test procedure . 43
Bibliography . 45
Figure 1 – Protocol for characterisation of combustible dust or combustible flying . 12
Figure 2 – Tests to define ability to form explosive dust atmosphere (combustible
dust/combustible flyings) . 13
Figure 3 – Tests to characterise combustible dust or combustible flying . 14
Figure 4 – Modified Hartmann tube . 23
Figure 5 – Measuring cell for powder resistivity . 25
Figure A.1 – Typical surface temperature distribution (method A) . 27
Figure B.1 – Vertical cross-section through the Godbert-Greenwald oven . 28
Figure C.1 – Circuit – Triggering by high-voltage relay, using a two-electrode system . 29
Figure C.2 – Apparatus for determining the minimum ignition energies of dust
(schematic) – Triggering by auxiliary spark using three-electrode system . 30
Figure C.3 – Apparatus for determining the minimum ignition energies of dust
(schematic) – Triggering by electrode movement . 31
Figure C.4 – Apparatus for determining the minimum ignition energies of dust
(schematic) – Triggering by voltage increase . 32
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ISO/IEC 2016
Figure C.5 – Apparatus for determining the minimum ignition energies for dust
(schematic) – Trigger transformer in discharge circuit . 33
Figure D.1 – Vertical tube apparatus (modified Hartmann tube) . 34
Figure E.1 – Test equipment 20-litre sphere (schematic) . 35
Figure E.2 – Cross-sectional view of rebound nozzle . 36
Figure E.3 – Plan view of rebound nozzle . 36
Figure E.4 – Cross-sectional view of dispersion cup . 36
Figure F.1 – Cross-sectional arrangement of BAM oven . 37
3
Figure H.1 – 1 m vessel (schematic) . 40
Figure H.2 – Location of the 6 mm holes in the semicircular dust dispenser . 41
Figure H.3 – Rebound nozzle . 42
Figure H.4 – Dispersion cup . 43
Table 1 – Example of ignition test report . 21
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SIST EN ISO/IEC 80079-20-2:2016
ISO/IEC 80079-20-2:2016 – 5 –
ISO/IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
EXPLOSIVE ATMOSPHERES –
Part 20-2: Material characteristics –
Combustible dusts test methods
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-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this 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 ISO/IEC 80079-20-2 has been prepared by subcommittee 31M: Non-
electrical equipment and protective systems for explosive atmospheres, of IEC 31: Equipment
for explosive atmospheres.
It is published as a double logo standard.
This first edition cancels and replaces the first edition of IEC 61241-2-1 published in 1994, the
first edition of IEC 61241-2-2 published in 1993 and the first edition of IEC 61241-2-3
published in 1994, combining the requirements into a single document, and is considered to
constitute a technical revision.
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ISO/IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
31M/102/FDIS 31M/108/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. In ISO, the standard has been approved by 15 P-members
out of 21 having cast a vote.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
"A list of all parts in the IEC 60079 series, under the general title Explosive atmospheres, as
well as the Interna
...
SLOVENSKI STANDARD
oSIST prEN ISO 80079-20-2:2014
01-oktober-2014
Eksplozivne atmosfere - 20-2. del: Lastnosti materiala - Preskusne metode
gorljivega prahu (ISO/DIS 80079-20-2:2014)
Explosive atmospheres - Part 20-2: Material characteristics - Combustible dusts test
methods (ISO/DIS 80079-20-2:2014)
Ta slovenski standard je istoveten z: prEN ISO 80079-20-2
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
oSIST prEN ISO 80079-20-2:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN ISO 80079-20-2:2014
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oSIST prEN ISO 80079-20-2:2014
DRAFT INTERNATIONAL STANDARD IEC/DIS 80079-20-2
Secretariat: TMB
Voting begins on Voting terminates on
2014-07-18 2014-10-24
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ ORGANISATION INTERNATIONALE DE NORMALISATION
INTERNATIONAL ELECTROTECHNICAL COMMISSION МЕЖДУНАРОДНАЯ ЭЛЕКТРОТЕХНИЧЕСКАЯ КОММИСИЯ COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
Explosive atmospheres —
Part 20-2:
Material characteristics -- Combustible dusts test methods
Atmosphères explosives —
Partie 20-2
ICS 29.260.20
This draft is submitted to a parallel enquiry in ISO and a CDV vote in the IEC.
THIS DOCUMENT IS A DRAFT CIRCULATED FOR COMMENT AND APPROVAL. IT IS THEREFORE SUBJECT TO CHANGE AND MAY NOT BE
REFERRED TO AS AN INTERNATIONAL STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS BEING ACCEPTABLE FOR INDUSTRIAL, TECHNOLOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON OCCASION HAVE TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL TO BECOME
STANDARDS TO WHICH REFERENCE MAY BE MADE IN NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT, WITH THEIR COMMENTS, NOTIFICATION OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPORTING DOCUMENTATION.
© International Electrotechnical Commission, 2014
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oSIST prEN ISO 80079-20-2:2014
IEC/DIS 80079-20-2
© International Electrotechnical Commission, 2014
ii
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oSIST prEN ISO 80079-20-2:2014
– 2 – 80079-20-2/Ed1/CDV © ISO/IEC:2014
1 CONTENTS
2 1 Scope . 7
3 2 Normative references . 7
4 3 Terms and definitions . 7
5 4 Dust sample requirements . 8
6 4.1 Receipt of sample for testing . 8
7 4.2 Characterisation of sample . 8
8 4.3 Preparation of sample . 9
9 4.4 Test conditions . 9
10 5 Combustible dusts and combustible flyings determination . 9
11 5.1 Test sequence . 9
12 5.2 Tests to determine whether material is a combustible dust or combustible
13 flying . 9
14 5.2.1 Visual inspection . 9
15 5.2.2 Determine particle distribution . 9
16 5.2.3 Igntion test in the Hartmann tube . 10
17 5.2.4 Ignition test in the 20 litre sphere . 10
18 6 Protocol for characterisation of combustible dust or combustible flying . 10
19 6.1 General . 10
20 7 Test methods for determination of whether a material is a combustible dust or
21 combustible flyings . 14
22 7.1 General . 14
23 7.2 Modified Hartmann tube . 14
24 7.2.1 Test equipment . 14
25 7.2.2 Test procedure . 14
26 7.3 20 litre sphere . 14
27 7.3.1 Test equipment . 15
28 7.3.2 Test procedure . 15
29 7.4 Alternative method to 20 litre sphere for small test material quantities . 16
30 7.4.1 Test equipment . 16
31 7.4.2 Test procedure . 16
32 8 Test methods for characterising combustible dusts – test for MIT of a dust cloud . 17
33 8.1 General . 17
34 8.2 GG furnace . 17
35 8.2.1 Test equipment . 17
36 8.2.2 Test procedure . 17
37 8.2.3 Reporting of test results . 17
38 8.3 BAM furnace . 18
39 8.3.1 Test equipment . 18
40 8.3.2 Test procedure . 18
41 8.3.3 Reporting of test results . 18
42 8.4 Test for MIT of dust layer . 19
43 8.4.1 Heated surface . 19
44 8.4.2 Dust layers . 19
45 8.4.3 Dust layer temperature . 19
46 8.4.4 Ambient temperature measurements . 20
47 8.4.5 Method . 20
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48 8.4.6 Results . 20
49 8.4.7 Reporting of results . 21
50 8.5 Method for determining minimum ignition energy of dust/air mixtures . 21
51 8.5.1 Spark generation circuit . 21
52 8.5.2 Test vessel for determination of minimum ignition energies by an
53 electrically generated high-voltage d.c. sparks. . 22
54 8.5.3 Procedure . 23
55 8.6 Procedure for determination of minimum ignition energies by an electrically
56 generated high-voltage d.c. sparks. . 23
57 8.6.1 Calibration for determination of minimum ignition energies (MIE) by
58 an electrically generated high-voltage d.c. sparks. . 24
59 8.6.2 Test report . 24
60 8.7 Test on resistivity . 24
61 8.7.1 Principle . 24
62 8.7.2 Apparatus . 24
63 8.7.3 Procedure . 25
64 8.7.4 Acceptance criteria . 26
65 9 Reporting of test results . 26
66 Annex A (normative) Measurement of temperature distribution on the surface of the
67 hot plate . 27
68 Annex B (informative) Godbert-Greenwald oven (GG) . 28
69 Annex C (informative) Examples of spark-generating systems . 29
70 C.1 General . 29
71 C.2 Triggering by auxiliary spark using three-electrode system . 30
72 C.3 Triggering by electrode movement . 31
73 C.4 Triggering by voltage increase (trickle-charging circuit) . 31
74 C.5 Triggering by auxiliary spark, using normal two-electrode system - (trigger
75 transformer in discharge circuit) . 32
76 Annex D (Normative) Vertical tube (modified Hartmann tube) apparatus . 34
77 Annex E (Informative) 20 litre sphere . 35
78 E.1 Test apparatus . 35
79 Annex F (informative) BAM oven . 37
80 Annex G (Informative) Data for dust explosion characteristics. 38
3
81 Annex H (informative) 1 m Vessel . 39
82 H.1 Test principal . 39
83 H.2 Test apparatus . 39
84 H.3 Test conditions . 43
85 H.4 Test procedure . 43
86
87 Figure 1 – Protocol for Characterisation of combustible dust or combustible flying . 11
88 Figure 2 – Tests to define ability to form explosive dust atmosphere (combustible
89 dust/combustible flyings) . 12
90 Figure 3 – Tests to characterise combustible dust or combustible flying . 13
91 Figure 4 – Modified Hartmann tube . 22
92 Figure 5 – Measuring cell for powder resistivity . 25
93 Figure A.1 – Typical surface temperature distribution (method A) . 27
94 Figure B.1 – Vertical Cross-section through the Godbert-Greenwald Oven . 28
95 Figure C.1 – Circuit . 29
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96 Figure C.2 – Apparatus for determining the minimum ignition energies of dust
97 (schematic) - Triggering by auxiliary spark using three-electrode system . 30
98 Figure C.3 – Apparatus for determining the minimum ignition energies of dust
99 (schematic) – Triggering by electrode movement . 31
100 Figure C.4 – Apparatus for determining the minimum ignition energies of dust
101 (schematic) – Triggering by voltage increase . 32
102 Figure C.5 – Apparatus for determining the minimum ignition energies for dust
103 (schematic) – Trigger transformer in discharge circuit . 33
104 Figure D.1 – Vertical Tube Apparatus (modified Hartmann tube) . 34
105 Figure E.1 – Test equipment 20 l sphere (schematic) . 35
106 Figure E.2 – Cross-sectional view of rebound nozzle . 36
107 Figure E.3 – Plan view of rebound nozzle . 36
108 Figure E.4 – Cross-sectional view of dispersion cup . 36
109 Figure F.1 – Cross-sectional arrangement of BAM oven . 37
110 Figure H.1 – 1 m³ vessel (schematic) . 40
111 Figure H.2 – Location of the 6 mm holes in the semicircular dust disperser . 41
112 Figure H.3 – Rebound Nozzle . 42
113 Figure H.4 – Dispersion cup . 43
114 Table 1 – Example of ignition test report . 21
115
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116 INTERNATIONAL ELECTROTECHNICAL COMMISSION
117 ____________
118
119 EXPLOSIVE ATMOSPHERES –
120
121 Part 20-2: Material characteristics – Combustible dusts test methods
122
123 FOREWORD
124 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
125 all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
126 international co-operation on all questions concerning standardization in the electrical and electronic fields. To
127 this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
128 Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
129 Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
130 in the subject dealt with may participate in this preparatory work. International, governmental and non -
131 governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
132 with the International Organization for Standardization (ISO) in accordance with conditions determined by
133 agreement between the two organizations.
134 2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
135 consensus of opinion on the relevant subjects since each technical committee has representation from all
136 interested IEC National Committees.
137 3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
138 Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
139 Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
140 misinterpretation by any end user.
141 4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
142 transparently to the maximum extent possible in their national and regional publications. Any divergence
143 between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
144 the latter.
145 5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
146 assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
147 services carried out by independent certification bodies.
148 6) All users should ensure that they have the latest edition of this publication.
149 7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
150 members of its technical committees and IEC National Committees for any personal injury, property damage or
151 other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
152 expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
153 Publications.
154 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
155 indispensable for the correct application of this publication.
156 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
157 patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
158 International Standard IEC 80079-20-2 has been prepared by subcommittee 31M: Non-
159 electrical equipment and protective systems for explosive atmospheres, of IEC 31 : Equipment
160 for explosive atmospheres.
161 This first edition cancels and replaces the first editions of IEC 61241-2-1, IEC 61241-2-2 and IEC 61241-2-3
162 combining the requirements into a single document and is considered to constitute a technical revision.
163
164
165 The text of this standard is based on the following documents:
FDIS Report on voting
31M/XX/FDIS 31M/XX/RVD
166
167 Full information on the voting for the approval of this standard can be found in the report on
168 voting indicated in the above table.
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169 This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
170 The committee has decided that the contents of this publication will remain unchanged until
171 the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
172 related to the specific publication. At this date, the publication will be
173 • reconfirmed,
174 • withdrawn,
175 • replaced by a revised edition, or
176 • amended.
177
178 The National Committees are requested to note that for this publication the stability date
179 is 2018
180 THIS TEXT IS INCLUDED FOR THE INFORMATION OF THE NATIONAL COMMITTEES AND WILL BE
181 DELETED AT THE PUBLICATION STAGE.
182
183
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184 EXPLOSIVE ATMOSPHERES –
185
186 Part 20-2: Material characteristics – Combustible dusts test methods
187
188
189
190 1 Scope
191 This standard describes the test methods for determining whether a material exhibits
192 properties to be considered to be combustible dust and for determining the characteristics of
193 combustible dusts.
194 This test method is applicable to the identification and classification of areas where explosive
195 dust atmospheres and combustible dust layers are present, in order to permit the proper
196 assessment of potential equipment ignition sources that must be used in the construction and
197 application of equipment for use in the presence of combustible dust.
198 The test methods defined do not apply to:
199 – recognized explosives, gunpowder, dynamite, or substances or mixtures of substances
200 which may, under some circumstances, behave in a similar manner; or
201 – dusts of explosives that do not require atmospheric oxygen for combustion, or to
202 pyrophoric substances
203 2 Normative references
204 The following referenced documents are indispensable for the application of this document.
205 For dated references, only the edition cited applies. For undated references, the latest edition
206 of the referenced document (including any amendments) applies.
207 ISO/IEC 80079-34, Explosive atmospheres – Part 34: Application of quality systems for
208 equipment manufacture
209 3 Terms and definitions
210 For the purpose of this standard the following definitions apply:
211 3.1
212 combustible dust
213 finely divided solid particles, 500 μm or less in nominal size, which may form explosive
214 mixtures with air at standard atmospheric pressure and temperatures
215 NOTE 1 to entry: This includes dust and grit as defined in ISO 4225.
216 NOTE 2 to entry: The term 'solid particles' is intended to address particles in the solid phase and not the gaseous
217 or liquid phase, but does not preclude a hollow particle.
218 3.2
219 combustible flyings
220 solid particles, including fibres, where one dimension is greater than 500 μm in nominal size,
221 which may form an explosive mixture with air at standard atmospheric pressure and
222 temperature
223 NOTE 1 to entry: One dimension has a high ratio when compared to the other two dimensions
224 NOTE 2 to entry: Examples of flyings include carbon fibre, rayon, cotton (including cotton linters and cotton waste)
225 sisal, jute, hemp, cocoa fibre, oakum and baled waste kapok.
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226 3.3
227 conductive dust
228 combustible metal dusts and other combustible dusts with electrical resistivity equal to or less
3
229 than 1×10 Ωm
230 3.4
231 non-conductive dust
3
232 combustible dust with electrical resistivity greater than 1×10 Ωm
233 3.5
234 minimum ignition temperature of a dust layer
235 lowest temperature of a hot surface at which ignition occurs in a dust layer under specified
236 test conditions
237 3.6
238 minimum ignition temperature of a dust cloud
239 lowest temperature of a hot surface on which the most ignitable mixture of the dust with air is
240 ignited under specified test conditions
241 4 Dust sample requirements
242 4.1 Receipt of sample for testing
243 It is normal to provide a quantity of at least 0,5 kg for testing. If sample preparation is
244 required this may be insufficient. If only smaller volume of material is available then the full
245 range of testing may not be possible.
246 The applicant shall provide a material safety data sheet or equivalent with the sample.
247 The applicant shall provide the test material in suitable packaging, labelled according to
248 relevant guidelines, and appropriate transportation.
249 4.2 Characterisation of sample
250 The applicant shall be responsible for ensuring that the sample is representative of the
251 material as it appears in the process operated.
252 NOTE Many unit operations such as extract systems will separate dust into finer fractions than seen in the main
253 processing equipment and is accounted for when taking the sample.
254 If the applicant cannot ensure that the sample is representative then sample preparation shall
255 be carried out to apply worst case conditions as determined by the testing laboratory.
256 The applicant shall advise the condition of the sample to be tested. This shall include
257
258 – minimum particle size;
259 – median particle size;
260 – maximum particle size;
261 – particle distribution;
262 – moisture content; and
263 – method of determination (e.g. Optical methods or sieving).
264 If the applicant cannot provide usable data then this shall be determined separately.
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265 Any apparent changes noted in the properties of the dust during preparation of the sample, for
266 example, by sieving or owing to temperature or humidity conditions, shall be stated in the test
267 report.
268 4.3 Preparation of sample
269 If it is not possible to test the sample as received, or if the sample is no longer representative
270 of the process material then it may be necessary to condition or alter the sample for testing.
271 This may include
272 – grinding/sieving;
273 – drying; and
274 – humidifying.
275 NOTE Sample preparation such as grinding and sieving, or drying can alter the material characteristics. Where
276 finer fractions are present in a facility it is appropriate to take fractions of less than 63 μm to give the most easily
277 ignitable mixtures. When the sample is a mixture of substances, the sample preparation can result in a change to
278 the sample’s composition.
279 4.4 Test conditions
280 The tests shall be carried out at standard atmospheric temperature and pressure unless
281 otherwise specified.
282 5 Combustible dusts and combustible flyings determination
283 5.1 Test sequence
284 The sequence followed for the determination of the material properties of combustible dust
285 and combustible flyings is given in 5.2, 6 and Figure 1, Figure 2 and Figure 3.
286 NOTE Refer also to the information referenced in Annex G.
287 5.2 Tests to determine whether material is a combustible dust or combustible f lying
288 The following is an outline of the steps that are followed in the process of making the
289 determination of whether the sample of the material being tested consists of combustible dust
290 or a combustible flying.
291 5.2.1 Visual inspection
292 Make a visual inspection of the test material (by microscope if necessary) to determine
293 whether the material consists of combustible flyings:
294 if the material consists of combustible flyings with dust then continue to test procedure
295 in Hartmann tube to determine whether the combination of the two is combustible dust
296 if the material consists only of combustible flyings then continue to test procedure in
297 Hartmann tube to determine whether it is combustible flyings
298 5.2.2 Determine particle distribution
299 For material which does not contain combustible flyings check the particle size distribution:
300 if there are no particles below 500 μm in size then the material is not a combustible dust
301 if there are any particles below 500 μm in size then continue to test procedure in
302 Hartmann tube to determine whether it is a combustible dust
303
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304 5.2.3 Igntion test in the Hartmann tube
305 Test in Hartmann tube with a spark (see 7.2):
306 if ignition occurs material is a combustible dust or combustible flying (proceed to
307 characterisation of combustible dust or combustible flying (6).
308 if no ignition occurs:
309 i) proceed to Hartmann tube with hot coil ignition source (see 7.2)
310 ii) it can be assumed that the minimum ignition energy is greater than 1 J and the test
311 material is hard to ignite.
312 Test in Hartmann tube with hot coil ignition source (see 7.2):
313 if ignition occurs material is a combustible dust or combustible flying, (proceed to
314 characterisation of combustible dust or combustible flying (6).
315 if no ignition occurs:
316 i) proceed to the test in the 20 litrel sphere (see 7.3)
317 ii) it can be assumed that the minimum ignition energy is greater than 10 J.
318 5.2.4 Ignition test in the 20 litre sphere
319 20 litre sphere test (see 5.3):
3
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