SIST EN 14973:2016
(Main)Conveyor belts for use in underground installations - Electrical and flammability safety requirements
Conveyor belts for use in underground installations - Electrical and flammability safety requirements
This European Standard specifies electrical and flammability safety requirements for conveyor belts
intended for use in underground installations, in the presence of flammable or non-flammable
atmospheres.
Conveyor belts covered by this European Standard and intended for use in flammable atmospheres are
intended for use on conveyor belt installations (machinery in mines). The belt is a component or part of
equipment, which can be incorporated into the conveyor, which is an equipment of Group I, Category
M2, as defined in 3.2.2 of EN 13463-1:2009.
This European Standard is not applicable to light conveyor belts as described in EN ISO 21183-1:2006
nor is it applicable to conveyor belts which are manufactured before the date of publication of this
document by CEN.
This European Standard deals with those significant hazards detailed in A.1.
Attention is drawn to Annexes ZA and ZB.
NOTE A summary of the requirements of this European Standard is given in Table 2. This is intended for
quick reference only.
Fördergurte für die Verwendung unter Tage - Elektrische und brandtechnische Sicherheitsanforderungen
Diese Europäische Norm legt elektrische und brandtechnische Sicherheitsanforderungen an Fördergurte für den Einsatz unter Tage bei entflammbarer und nicht entflammbarer Atmosphäre fest.
Fördergurte, die unter diese Europäische Norm fallen, sind vorgesehen für den Gebrauch in Förderanlagen beim Einsatz in entflammbaren Atmosphären (Bergwerken). Der Gurt ist ein Teil der Fördereinrichtung, die eine Ausrüstung nach Gruppe I, Kategorie M2 darstellt, wie in EN 13463-1:2009, 3.2.2 definiert.
Diese Europäische Norm ist nicht auf die in EN 873 beschriebenen leichten Fördergurte anwendbar und auch nicht auf Fördergurte, die vor dem Datum der Veröffentlichung dieses Dokuments durch CEN hergestellt wurden.
Diese Europäische Norm behandelt die in A.1 aufgeführten signifikanten Gefahren.
Aufmerksamkeit wird auf die Anhänge ZA und ZB gelenkt.
ANMERKUNG Tabelle 2 gibt eine Zusammenfassung der Anforderungen dieser Europäischen Norm.
Courroies transporteuses pour usage dans les installations souterraines - Prescriptions de sécurité électrique et protection contre l'inflammation
La présente Norme Européenne spécifie des prescriptions en matière de sécurité électrique et de protection contre l’inflammation, pour les courroies transporteuses destinées à être utilisées dans des installations souterraines, en atmosphères inflammables ou non inflammables.
Les courroies transporteuses couvertes par la présente Norme européenne et destinées à être utilisées en atmosphères inflammables sont destinées aux installations de convoyeur par bandes (machines dans les mines). La courroie est un composant, qui est incorporé dans le convoyeur, qui est lui-même un équipement du Groupe 1, Catégorie M2, tel que défini en 3.2.2 de l’EN 13463-1:2009.
La présente Norme européenne n’est pas applicable aux courroies transporteuses légères telles que décrites dans l’EN 873, ni aux courroies transporteuses qui ont été fabriquées avant la publication du présent document par le CEN.
La présente Norme européenne traite des phénomènes dangereux significatifs détaillés en A.1.
L’attention est attirée sur les Annexes ZA et ZB.
NOTE Un résumé des prescriptions de la présente Norme européenne est donné au Tableau 2.
Naprave za kontinuirni transport - Trakovi tračnih transporterjev za podzemno vgradnjo - Električne in požarnovarnostne zahteve
Ta evropski standard določa električne in požarnovarnostne zahteve za trakove tračnih transporterjev, namenjenih za uporabo pri podzemnih vgradnjah, v prisotnosti vnetljivih ali nevnetljivih atmosfer.
Trakovi tračnih transporterjev, ki jih pokriva ta evropski standard in so namenjeni za uporabo v vnetljivih atmosferah, so namenjeni za uporabo v inštalacijah trakov tračnih transporterjev (stroji v rudnikih). Trak je komponenta ali del opreme, ki ga je mogoče vgraditi v tračni transporter, ki je oprema skupine I, kategorije M2, kot je opredeljeno v točki 3.2.2 v standardu EN 13463-1:2009.
Ta evropski standard ne velja za lahke trakove tračnih transporterjev, kot je opisano v standardu EN ISO 21183-1:2006, niti za trakove tračnih transporterjev, izdelane pred datumom objave tega dokumenta s strani združenja CEN.
Ta evropski standard obravnava večje nevarnosti, opredeljene pod točko A.1. Posebna pozornost je namenjena dodatkoma ZA in ZB. OPOMBA V preglednici 2 je podan povzetek zahtev tega evropskega standarda. To je namenjeno samo za hitri pregled.
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Fördergurte für die Verwendung unter Tage - Elektrische und brandtechnische SicherheitsanforderungenCourroies transporteuses pour usage dans les installations souterraines - Prescriptions de sécurité électrique et protection contre l'inflammationConveyor belts for use in underground installations - Electrical and flammability safety requirements53.040.20Deli za transporterjeComponents for conveyors13.220.40Sposobnost vžiga in obnašanje materialov in proizvodov pri gorenjuIgnitability and burning behaviour of materials and productsICS:Ta slovenski standard je istoveten z:EN 14973:2015SIST EN 14973:2016en,fr,de01-februar-2016SIST EN 14973:2016SLOVENSKI
STANDARDSIST EN 14973:2007+A1:20081DGRPHãþD
SIST EN 14973:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14973
November
t r s w ICS
w uä r v rä s râ
s uä t t rä v r Supersedes EN
s v { y uã t r r x ªA sã t r r zEnglish Version
Conveyor belts for use in underground installations æ Electrical and flammability safety requirements Courroies transporteuses pour usage dans les installations souterraines æ Prescriptions de sécurité électrique et protection contre l 5inflammation
Fördergurte für die Verwendung unter Tage æ Elektrische und brandtechnische Sicherheitsanforderungen This European Standard was approved by CEN on
t x September
t r s wä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels
9
t r s w CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v { y uã t r s w ESIST EN 14973:2016
EN 14973:2015 2 Contents Page European foreword . 4 Introduction . 5 1 Scope . 6 2 Normative references . 6 3 Terms and definitions . 7 4 Ignition hazard assessment . 8 5 Electrical resistance . 8 6 Frictional heating . 8 6.1 Conveyor belts intended for general use in underground installations (Class A), and for use in hazardous installations where secondary safety devices are present (Classes B2 and C2) . 8 6.2 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere and where secondary safety devices are not present (Class B1) . 8 6.3 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere plus combustible dust or material conveyed, and where secondary safety devices are not present (Class C1) . 9 7 Resistance to ignition . 9 7.1 Conveyor belts intended for general use in underground installations (Class A), for use where there is a potentially flammable atmosphere (Classes B1 and B2), and for use in hazardous installations where secondary safety devices are present (Class C2) . 9 7.2 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere plus combustible dust or material conveyed, and where secondary safety devices are not present (Class C1) . 9 8 Fire propagation . 9 8.1 Introduction . 9 8.2 Conveyor belts intended for general use in underground installations (Class A) and for use where there is a potentially flammable atmosphere (Classes B1 and B2) . 10 8.2.1 General . 10 8.2.2 Two metre propane burner test . 10 8.2.3 Double burner test . 10 8.2.4 Mid-scale high energy test . 10 8.3 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere plus combustible dust or material conveyed, and where secondary safety devices are not present (Class C1) . 10 8.4 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere plus combustible dust or material conveyed, plus additional fuel sources (fire load) and where secondary safety devices are present (Class C2) . 11 8.4.1 Full scale gallery . 11 8.4.2 Laboratory scale gallery . 11 9 Marking . 11 Annex A (informative)
Hazards and risk assessment . 13 SIST EN 14973:2016
EN 14973:2015 3 A.1 Identification of hazards . 13 A.2 Risk assessment . 13 A.3 Methods for addressing hazards . 14 Annex B (informative)
Example of an ignition hazard assessment for a conveyor belt intended for use in a potentially explosive atmosphere . 15 Annex C (informative)
Suggested conveyor belt approval / compliance options . 16 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC . 17 Annex ZB (informative)
Relationship between this European Standard and the Essential Requirements of EC Directive 2006/42/EC . 18 Bibliography . 19
SIST EN 14973:2016
EN 14973:2015 4 European foreword This document (EN 14973:2015) has been prepared by Technical Committee CEN/TC 188 “Conveyor belts”, the secretariat of which is held by SNV. 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 May 2016, and conflicting national standards shall be withdrawn at the latest by May 2016. 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. This document supersedes EN 14973:2006+A1:2008. 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 EU Directive(s). For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are an integral part of this document. Significant technical changes between this document and the previous edition of this European Standard: Requirements for alternative Fire Propagation test, method D, added. For a defined range of belts this laboratory scale test can be substituted for the full scale test specified in EN 12881-2 and 8.4 of this document. 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. SIST EN 14973:2016
EN 14973:2015 5 Introduction This document is a type C standard as stated in EN ISO 12100. The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this document. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. The approach taken in this European Standard is to identify the main hazards encountered in underground conveying applications and to specify requirements for conveyor belts that will provide the necessary operational safety. Three Classes are specified, A, B and C, as defined in 3.9 to 3.11. NOTE According to national authorities Class C (C1/C2) conveyor belts are requested for use in EU coal mining. SIST EN 14973:2016
EN 14973:2015 6 1 Scope This European Standard specifies electrical and flammability safety requirements for conveyor belts intended for use in underground installations, in the presence of flammable or non-flammable atmospheres. Conveyor belts covered by this European Standard and intended for use in flammable atmospheres are intended for use on conveyor belt installations (machinery in mines). The belt is a component or part of equipment, which can be incorporated into the conveyor, which is an equipment of Group I, Category M2, as defined in 3.2.2 of EN 13463-1:2009. This European Standard is not applicable to light conveyor belts as described in EN ISO 21183-1:2006 nor is it applicable to conveyor belts which are manufactured before the date of publication of this document by CEN. This European Standard deals with those significant hazards detailed in A.1. Attention is drawn to Annexes ZA and ZB. NOTE
A summary of the requirements of this European Standard is given in Table 2. This is intended for quick reference only. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1554:2012, Conveyor belts — Drum friction testing EN 1710:2005+A1:2008, Equipment and components intended for use in potentially explosive atmospheres in underground mines EN 12881-1:2014, Conveyor belts — Fire simulation flammability testing — Part 1: Propane burner tests EN 12881-2, Conveyor belts — Fire simulation flammability testing — Part 2: Large-scale fire test EN 13463-1:2009, Non-electrical equipment for use in potentially explosive atmospheres — Part 1: Basic method and requirements EN 31010, Risk management — Risk assessment techniques EN ISO 284, Conveyor belts — Electrical conductivity — Specification and test method (ISO 284) EN ISO 340, Conveyor belts — Laboratory scale flammability characteristics — Requirements and test method (ISO 340) EN ISO 12100, Safety of machinery — General principles for design — Risk assessment and risk reduction (ISO 12100) EN ISO 15236-3:2007, Steel cord conveyor belts — Part 3: Special safety requirements for belts for use in underground installations (ISO 15236-3:2007) EN ISO 22721:2007, Conveyor belts — Specification for rubber- or plastics-covered conveyor belts of textile construction for underground mining (ISO 22721:2007) SIST EN 14973:2016
EN 14973:2015 7 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 12100 and the following apply. 3.1 afterflame flame which persists after the ignition source has been removed 3.2 afterglow persistence of glowing, after cessation of flaming or, if no flaming occurs, after the ignition source has been removed 3.3 flame (noun) zone of combustion in the gaseous phase usually with emission of light 3.4 to flame (verb) to undergo combustion in the gaseous phase with emission of light 3.5 glowing made luminous by heat (without flame) 3.6 undamaged that part of a conveyor belt remaining after the termination of the fire tests described in EN 12881 and which shows no evidence of embrittlement, cracking, blistering or other blemishes not originally present 3.7 secondary safety device equipment or apparatus provided for the purpose of assisting in the provision of a safe working environment, e.g. slip detectors, heat detectors, water fire extinguishing systems 3.8 incomplete ignition situation in which the part of the conveyor belt above the burner burns only on the bottom side and not on the top side when the burner is removed 3.9 class A belt conveyor belt intended for general use where the only hazard is limited access and means of escape 3.10 class B belt conveyor belt intended for use where there is limited access and means of escape, where a potentially explosive atmosphere is present and where secondary safety devices are either not present (Class B1) or present (Class B2) SIST EN 14973:2016
EN 14973:2015 8 3.11 class C belt conveyor belt intended for use where there is limited access and means of escape, where a potentially explosive atmosphere is present, where other combustible material or dust is either being conveyed or is a potential source of additional fuel (fire load) and where secondary safety devices are either not present (Class C1) or present (Class C2) 3.12 additional fuel source (fire load) material, eg wooden linings or plastic pipes, significantly additional to the conveyor belt and conveyed material which it is considered likely would contribute to the ignition source of the conveyor belt in a fire situation 3.13 potentially explosive atmosphere atmosphere which could become explosive due to local and operational conditions 4 Ignition hazard assessment In order to determine which class of conveyor belt has to be used in an underground installation. The operating company shall carry out an ignition hazard assessment. The result of such an assessment shall lead to a class of conveyor belt according to this standard. Annex A of this standard and Annex A of EN 1710:2005+A1:2008 serve as aids for preparing such an ignition hazard assessment. NOTE An example of an ignition hazard assessment for a conveyor belt intended for use in a potentially explosive atmosphere is given in Annex B. 5 Electrical resistance When tested in accordance with EN ISO 284, conveyor belts intended for use in underground installations shall have an electrical surface resistance not greater than
u r r M Àä 6 Frictional heating 6.1 Conveyor belts intended for general use in underground installations (Class A), and for use in hazardous installations where secondary safety devices are present (Classes B2 and C2) When tested in accordance with EN 1554:2012, Method B2, or Method B1 if the use of Method B2 is impossible, e.g. when testing steel cord conveyor belts, conveyor belts intended for use in these applications shall exhibit no flame whatsoever, although glowing is permissible. No requirements are included for the maximum temperature of the drum. 6.2 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere and where secondary safety devices are not present (Class B1) When tested in accordance with EN 1554:2012, Method B2, or Method B1 if the use of Method B2 is impossible, e.g. when testing steel cord conveyor belts, conveyor belts intended for use in flammable atmospheres shall exhibit no flame or glow whatsoever and at no time shall the temperature of the drum exceed 450 °C. NOTE If the intrinsic properties of the conveyor belt alone are to be used to give a safe situation in the presence of flammable atmospheres, it is important to limit the temperature of the drum and not to allow glow. The temperature of 450 °C was chosen as being adequately below the ignition temperature of methane-air mixtures when in the presence of a hot drum surface. SIST EN 14973:2016
EN 14973:2015 9 6.3 Conveyor belts intended for use in installations where there is a potentially flammable atmosphere plus combustible dust or material conveyed, and where secondary safety devices are not present (Class C1) When tested in accordance with EN 1554:2012, Method B2, or Method B1 if the use of Method B2 is impossible, e.g. when testing steel cord conveyor belts, conveyor belts intended for use in the presence of coal dust shall exhibit no flame or glow whatsoever and at no time shall the temperature of the drum exceed 325 °C. NOTE If the intrinsic properties of the conveyor belt alone are to be used to give a safe situation in the presence of combustible dusts or material conveyed, it is important to limit the temperature of the drum and not to allow glow to avoid the possibility of combustion of dust on the belt. The drum temperature of 325 °C was chosen as being adequately below the ignition temperature of coal dust on the belt when in the presence of a hot drum surface. However, if the conveyor belt is to be used in the presence of other dusts, the purchaser/user and manufacturer may agree alternative requireme
...
SLOVENSKI STANDARD
oSIST prEN 14973:2014
01-januar-2014
1DSUDYH]DNRQWLQXLUQLWUDQVSRUW7UDNRYLWUDþQLKWUDQVSRUWHUMHY]DSRG]HPQR
YJUDGQMR(OHNWULþQHLQSRåDUQRYDUQRVWQH]DKWHYH
Conveyor belts for use in underground installations - Electrical and flammability safety
requirements
Fördergurte für die Verwendung unter Tage - Elektrische und brandtechnische
Sicherheitsanforderungen
Courroies transporteuses pour usage dans les installations souterraines - Prescriptions
de sécurité électrique et protection contre l'inflammation
Ta slovenski standard je istoveten z: prEN 14973
ICS:
13.220.40 Sposobnost vžiga in Ignitability and burning
obnašanje materialov in behaviour of materials and
proizvodov pri gorenju products
53.040.20 Deli za transporterje Components for conveyors
oSIST prEN 14973:2014 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14973:2014
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oSIST prEN 14973:2014
EUROPEAN STANDARD
DRAFT
prEN 14973
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2013
ICS 53.040.10; 13.220.40 Will supersede EN 14973:2006+A1:2008
English Version
Conveyor belts for use in underground installations - Electrical
and flammability safety requirements
Courroies transporteuses pour usage dans les installations Fördergurte für die Verwendung unter Tage - Elektrische
souterraines - Prescriptions de sécurité électrique et und brandtechnische Sicherheitsanforderungen
protection contre l'inflammation
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 188.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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.
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.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2013 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14973:2013: E
worldwide for CEN national Members.
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
Contents Page
Foreword .3
Introduction .4
1 Scope .5
2 Normative references .5
3 Terms and definitions .6
4 Ignition hazard assessment .7
5 Electrical resistance .7
6 Frictional heating .7
7 Resistance to ignition .8
8 Fire propagation.8
9 Marking . 10
Annex A (normative) Hazards and risk assessment . 12
Annex B (informative) Example of an ignition hazard assessment for a conveyor belt intended for
use in a potentially explosive atmosphere . 14
Annex C (informative) Suggested belt approval / certification options . 15
Annex ZA (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 94/9/EC . 16
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EC Directive 2006/42/EC . 17
Bibliography . 18
2
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
Foreword
This document (prEN 14973:2013) has been prepared by Technical Committee CEN/TC 188 “Conveyor
belts”, the secretariat of which is held by SNV.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14973:2006+A1:2008.
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 EC Directive(s).
For relationship with EC Directive(s), see informative Annex ZA, and ZB, which is an integral part of this
document.
The main changes with respect to the previous edition are listed below:
• Requirements for alternative Fire Propagation test added
3
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
Introduction
This document is a type C standard as stated in EN ISO 12100.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this document.
When provisions of this type C standard are different from those which are stated in type A or B standards, the
provisions of this type C standard take precedence over the provisions of the other standards, for machines
that have been designed and built according to the provisions of this type C standard.
The approach taken in this European Standard is to identify the main hazards encountered in underground
conveying applications and to specify requirements for conveyor belts that will provide the necessary
operational safety. Three Classes are specified, A, B and C, as defined in 3.9 to 3.11.
4
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
1 Scope
This European Standard specifies electrical and flammability safety requirements for conveyor belts intended
for use in underground installations, in the presence of flammable or non-flammable atmospheres.
Conveyor belts covered by this European Standard and intended for use in flammable atmospheres are
intended for use on conveyor belt installations (machinery in mines). The belt is a component, which will be
incorporated into the conveyor, which is an equipment of Group I, Category M2, as defined in 3.2.2 of EN
13463-1:2009.
This European Standard is not applicable to light conveyor belts as described in EN 873 nor is it applicable to
conveyor belts which are manufactured before the date of publication of this document by CEN.
This European Standard deals with those significant hazards detailed in A.1.
Attention is drawn to Annexes ZA and ZB.
NOTE A summary of the requirements of this European Standard is given in Table 2.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
EN 1050, Safety of machinery – Principles for risk assessment.
EN 15544, Conveyor belts – Drum friction testing.
EN 12881-1, Conveyor belts – Fire simulation flammability testing – Part 1: Propane burner tests.
EN 12881-2, Conveyor belts - Fire simulation flammability testing - Part 2: Large-scale fire test.
EN 13463-1:2009, Non-electrical equipment for potentially explosive atmospheres – Part 1: Basic method and
requirements.
EN ISO 284, Conveyor belts - Electrical conductivity - Specification and test method (ISO 284).
EN ISO 340, Conveyor belts - Laboratory scale flammability characteristics - Requirements and test method
(ISO 340).
EN ISO 12100, Safety of machinery - Basic concepts, general principles for design - Part 1: Basic
terminology, methodology (ISO 12100).
EN ISO 15236-3:2007, Steel cord conveyor belts - Part 3: Special safety requirements for belts for use in
underground installations (ISO 15236-3:2007).
EN ISO 22721:2007, Conveyor belts - Specification for rubber or plastics covered conveyor belts of textile
construction for underground mining (ISO 22721:2007).
IEC 60300-3-9, Dependability management – Part 3: Application guide – Section 9: Risk analysis of
technological systems.
5
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN ISO 12100 and the following apply.
3.1
afterflame
flame which persists after the ignition source has been removed
3.2
afterglow
persistence of glowing, after cessation of flaming or, if no flaming occurs, after the ignition source has been
removed
3.3
flame (noun)
zone of combustion in the gaseous phase usually with emission of light
3.4
to flame (verb)
to undergo combustion in the gaseous phase with emission of light
3.5
glowing
made luminous by heat (without flame)
3.6
undamaged
that part of a conveyor belt remaining after the termination of the fire tests described in EN 12881 and which
shows no evidence of embrittlement, cracking, blistering or other blemishes not originally present
3.7
secondary safety device
equipment or apparatus provided for the purpose of assisting in the provision of a safe working environment,
e.g. slip detectors, heat detectors, water fire extinguishing systems
3.8
incomplete ignition
situation in which the part of the conveyor belt above the burner burns only on the bottom side and not on the
top side when the burner is removed
3.9
Class A belt
conveyor belt intended for general use where the only hazard is limited access and means of escape
3.10
Class B belt
conveyor belt intended for use where there is limited access and means of escape, where a potentially
explosive atmosphere is present and where secondary safety devices are either not present (Class B1) or
present (Class B2)
3.11
Class C belt
conveyor belt intended for use where there is limited access and means of escape, where a potentially
explosive atmosphere is present, where other combustible material or dust is either being conveyed or is a
potential source of additional fuel (fire load) and where secondary safety devices are either not present (Class
C1) or present (Class C2)
6
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prEN 14973:2013 (E)
3.12
Additional fuel source (fire load)
Material, eg wooden linings or plastic pipes, significantly additional to the conveyor belt and conveyed material
which it is considered likely would contribute to the ignition source of the conveyor belt in a fire situation
4 Ignition hazard assessment
An ignition hazard assessment shall be carried out and documented as described in Annex A.
NOTE An example of an ignition hazard assessment for a conveyor belt intended for use in a potentially explosive
atmosphere is given in Annex B.
5 Electrical resistance
When tested in accordance with EN ISO 284, conveyor belts intended for use in underground installations
shall have an electrical surface resistance not greater than 300 MΩ.
6 Frictional heating
6.1 Belts intended for general use in underground installations (Class A), and for use in
hazardous installations where secondary safety devices are present (Classes B2 and C2)
When tested in accordance with EN 1554, Method B2, or Method B1 if the use of Method B2 is impossible,
e.g. when testing steel cord belts, conveyor belts intended for use in these applications shall exhibit no flame
whatsoever, although glowing is permissible. No requirements are included for the maximum temperature of
the drum.
6.2 Belts intended for use in installations where there is a potentially flammable
atmosphere and where secondary safety devices are not present (Class B1)
When tested in accordance with EN 1554, Method B2, or Method B1 if the use of Method B2 is impossible,
e.g. when testing steel cord belts, conveyor belts intended for use in flammable atmospheres shall exhibit no
flame or glow whatsoever and at no time shall the temperature of the drum exceed 450 °C.
NOTE If the intrinsic properties of the belt alone are to be used to give a safe situation in the presence of flammable
atmospheres, it is important to limit the temperature of the drum and not to allow glow. The temperature of 450 °C was
chosen as being adequately below the ignition temperature of methane-air mixtures when in the presence of a hot drum
surface.
6.3 Belts intended for use in installations where there is a potentially flammable
atmosphere plus combustible dust or material conveyed, and where secondary safety
devices are not present (Class C1)
When tested in accordance with EN 1554, Method B2, or Method B1 if the use of Method B2 is impossible,
e.g. when testing steel cord belts, conveyor belts intended for use in the presence of coal dust shall exhibit no
flame or glow whatsoever and at no time shall the temperature of the drum exceed 325 °C.
NOTE If the intrinsic properties of the belt alone are to be used to give a safe situation in the presence of combustible
dusts or material conveyed, it is important to limit the temperature of the drum and not to allow glow to avoid the possibility
of combustion of dust on the belt. The drum temperature of 325 °C was chosen as being adequately below the ignition
temperature of coal dust on the belt when in the presence of a hot drum surface. However, if the belt is to be used in the
presence of other dusts, the purchaser/user and manufacturer may agree alternative requirements on the basis of
experience, e.g. a different maximum drum temperature that will give an adequate margin of safety over the ignition
temperature of the dust in question.
7
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oSIST prEN 14973:2014
prEN 14973:2013 (E)
7 Resistance to ignition
7.1 Belts intended for general use in underground installations (Class A), for use where
there is a potentially flammable atmosphere (Classes B1 & B2), and for use in hazardous
installations where secondary safety devices are present (Class C2)
When tested in accordance with EN ISO 340, the sum of the afterflame times for each group of six tests (i.e.
six tests with covers intact and six tests with covers removed) shall be less than 45 s and no individual result
shall be greater than 15 s.
7.2 Belts intended for use in installations where there is a potentially flammable
atmosphere plus combustible dust or material conveyed, and where secondary safety
devices are not present (Class C1)
When tested in accordance with EN ISO 340, the average afterflame and afterglow times for six test pieces
with covers intact shall be no more than 3 s and no individual result shall be greater than 10 s. When tested
with covers removed, the average afterflame and afterglow times for the six test pieces shall be no more than
5 s and no individual result shall be more than 15 s.
8 Fire propagation
8.1 Introduction
8.1.1 The requirements in 8.2 to 8.4 are based on resistance to the propagation of fire from a localized
heat source. However, experience has shown that the two metre propane burner test given in
EN 12881-1, Method A (8.2.2) might not measure propagation if the belt is not fully ignited in the ten minute
period of flame application. In these circumstances, the mid-scale high energy test given in
EN 12881
...
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