1、April 2017 English price group 20No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 23.120!%dTw“2654984www.din.deDIN E
2、N 14986Design of fans working in potentially explosive atmospheres;English version EN 14986:2017,English translation of DIN EN 14986:2017-04Konstruktion von Ventilatoren fr den Einsatz in explosionsgefhrdeten Bereichen;Englische Fassung EN 14986:2017,Englische bersetzung von DIN EN 14986:2017-04Conc
3、eption des ventilateurs pour les atmosphres explosibles;Version anglaise EN 14986:2017,Traduction anglaise de DIN EN 14986:2017-04SupersedesDIN EN 14986:200705www.beuth.deDocument comprises 56 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered
4、authoritative.04.17 DIN EN 14986:2017-04 2 A comma is used as the decimal marker. National foreword This standard includes safety requirements. This document (EN 14986:2017) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres Explosion prevention and protection” (S
5、ecretariat: DIN, Germany). The responsible German body involved in its preparation was DIN-Normenausschuss Sicherheitstechnische Grundstze (DIN Standards Safety Design Principles), Working Committee NA 095-02-02 AA “Equipment for use in potentially explosive atmospheres”. The DIN Standards correspon
6、ding to the International Standards referred to in this document are as follows: ISO 281 DIN ISO 281 ISO 1925 DIN ISO 1925 ISO 1940-1 DIN ISO 1940-1 Amendments This standard differs from DIN EN 14986:2007-05 as follows: a) normative references have been updated; b) in subclause 4.5, mechanical desig
7、n requirements have been specified; c) in subclause 4.8, a note regarding the state of discussion on material pairings has been included; d) in Table 1 (material pairings), category 3 has been deleted; e) further material pairings have been included in Table 1; f) examples for impeller-shaft attachm
8、ent have been included; g) in the flame transmission test (Annex A), further test methods have been been included; h) in the list of significant hazards (Annex B), further hazards have been included. Previous editions DIN EN 14986: 2007-05 DIN EN 14986:2017-04 3 National Annex NA (informative) Bibli
9、ography DIN ISO 281, Rolling bearings Dynamic load ratings and rating life DIN ISO 1925, Mechanical vibration Balancing Vocabulary DIN ISO 1940-1, Mechanical vibration Balance quality requirements for rotors in a constant (rigid) state Part 1: Specification and verification of balance tolerances DIN
10、 EN 14986:2017-04 4 This page is intentionally blank EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14986 January 2017 ICS 23.120 Supersedes EN 14986:2007English Version Design of fans working in potentially explosive atmospheres Conception des ventilateurs pour les atmosphres explosibles Kons
11、truktion von Ventilatoren fr den Einsatz in explosionsgefhrdeten BereichenThis European Standard was approved by CEN on 30 October 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
12、 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
13、 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, Czec
14、h 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kin
15、gdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2017 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14986:
16、2017 EEN 14986:2017 (E) 2 Contents Page European foreword . 4 Introduction 5 1 Scope 6 2 Normative references 7 3 Terms and definitions . 7 4 Requirements for all fans . 8 4.1 Ignition hazard assessment . 8 4.1.1 General 8 4.1.2 Normal operating conditions 8 4.1.3 Expected malfunction 8 4.1.4 Rare m
17、alfunction . 8 4.2 Assignment of categories . 8 4.3 Temperatures . 9 4.3.1 General 9 4.3.2 Maximum surface temperature . 9 4.3.3 Temperature of the conveyed atmosphere (flammable or not) . 10 4.4 Mechanical design criteria 10 4.4.1 General . 10 4.4.2 Clearance between rotating elements and the fan c
18、asing . 10 4.5 Casing . 11 4.5.1 General . 11 4.5.2 Gas tightness 11 4.6 Impellers . 11 4.7 Materials for rotating and stationary parts of fans 11 4.7.1 General . 11 4.7.2 Permissible material pairings . 12 4.8 Linings and tip extensions 22 4.9 Vibration . 22 4.10 Earthing conducting parts 23 4.11 E
19、lectrostatic charges . 23 4.12 Electrical equipment . 23 4.13 Prevention of deposits inside the fan . 23 4.14 Shaft seals . 24 4.15 Bearings . 24 4.16 Power transmission systems . 24 4.17 Clutches and couplings . 24 4.18 Brakes and braking systems 24 4.19 Impeller-shaft attachment 24 4.20 Corrosion
20、of fan components . 28 4.21 Fire resistance . 28 4.22 Protection against foreign particles 28 5 Additional requirements for category 2 28 5.1 General . 28 5.2 Impeller-shaft attachment 28 5.3 Vibration . 29 DIN EN 14986:2017-04 EN 14986:2017 (E) 3 5.4 Material pairings . 29 6 Category 1 fans for spe
21、cific use with a gaseous explosive atmosphere as a conveyed atmosphere (flammable or not) 29 6.1 General requirements . 29 6.2 Flame arresters . 29 6.2.1 General . 29 6.2.2 Stabilized burning 29 6.3 Casings 30 6.3.1 General . 30 6.3.2 Gas tightness . 30 7 Information for use 30 7.1 General . 30 7.2
22、Accompanying documentation 30 7.3 Markings 32 Annex A (normative) Additional requirements for category 1 G fans 33 A.1 General . 33 A.2 Flame transmission test . 33 A.3 Pressure test . 34 Annex B (informative) Classification of requirements for the different categories 35 Annex C (informative) Check
23、list for verification of the safety requirements and/or protective measures 39 C.1 General . 39 C.2 All categories 39 C.3 Category 2 Gas and dust 40 C.4 Category 1 Gas 40 Annex D (informative) Examples of types of fans showing ignition minimizing features 41 Annex E (normative) List of significant h
24、azards . 46 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 2014/34/EU 50 Bibliography . 51 DIN EN 14986:2017-04 EN 14986:2017 (E) 4 European foreword This document (EN 14986:2017) has been prepared by Technical Committee CEN/TC 305 “
25、Potentially explosive atmospheres - Explosion prevention and protection”, the secretariat of which is held by DIN. This document supersedes EN 14986:2007. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lat
26、est by July 2017, and conflicting national standards shall be withdrawn at the latest by July 2017. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights. T
27、his 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 2014/34/EU. For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
28、 According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Ge
29、rmany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 14986:2017-04 EN 14986:2017 (E) 5 Introduction This European Standard i
30、s 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 and indicated in the scope of this European Standard. When provisions of this type C standard are different from those, which are stated in type A or B
31、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. DIN EN 14986:2017-04 EN 14986:2017 (E) 6 1 Scope 1.1 This European Standard specifies the
32、constructional requirements for fans constructed to Group II G (of explosion groups IIA, IIB and hydrogen) categories 1, 2 and 3, and Group II D categories 2 and 3, intended for use in explosive atmospheres. NOTE 1 Operation conditions for the different categories of fans used in this European Stand
33、ard are defined in Clause 4. NOTE 2 Technical requirements for category 1 D fans are not given in this document. Where explosive dust atmospheres are regularly conveyed, explosion protection measures as described in EN 11271 are required if this specific us is needed. 1.2 This European Standard does
34、 not apply to group I fans (fans for mining), cooling fans or impellers on rotating electrical machines, cooling fans or impellers on internal combustion engines. NOTE 1 Requirements for group I fans are given in EN 1710. NOTE 2 The requirements for electrical parts are covered by references to elec
35、trical equipment standards. 1.3 This European Standard specifies requirements for design, construction, testing and marking of complete fan units intended for use in potentially explosive atmospheres in air containing gas, vapour, mist and/or dusts. Such atmospheres may exist inside (the conveyed at
36、mosphere (flammable or not), outside, or inside and outside of the fan. 1.4 This European Standard is applicable to fans working in ambient atmospheres and with normal atmospheric conditions at the inlet, having absolute pressures ranging from 0,8 bar to 1,1 bar, and temperatures ranging from 20 C t
37、o +60 C, and maximum volume fraction of 21 % oxygen content, and an aerodynamic energy increase of less than 25 kJ/kg. NOTE 1 25 kJ/kg is equivalent to 30 kPa at inlet density of 1,2 kg/m3. This European Standard may also be helpful for the design, construction, testing and marking of fans intended
38、for use in atmospheres outside the validity range stated above or in cases where other material pairings need to be used. In this case, the ignition risk assessment, ignition protection provided, additional testing (if necessary), manufacturers marking, technical documentation and instructions to th
39、e user, should clearly demonstrate and indicate the equipments suitability for the conditions the fan may encounter. This European Standard should not apply to integral fans as a part of Diesel engines, vehicles or electric motors. NOTE 2 Where undated references are used in the body of the standard
40、 the latest edition applies. DIN EN 14986:2017-04 EN 14986:2017 (E) 7 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 referenc
41、es, the latest edition of the referenced document (including any amendments) applies. EN 1127-1:2011, Explosive atmospheres - Explosion prevention and protection - Part 1: Basic concepts and methodology EN ISO 80079-36:2016, Explosive atmospheres - Part 36: Non-electrical equipment for explosive atm
42、ospheres - Basic method and requirements (ISO 80079-36:2016) EN ISO 80079-37:2016, Explosive atmospheres - Part 37: Non-electrical equipment for explosive atmospheres - Non-electrical type of protection constructional safety c, control of ignition sources b, liquid immersion k (ISO 80079-37:2016) EN
43、 60079-0, Explosive atmospheres - Part 0: Equipment - General requirements EN ISO 5801, Industrial fans - Performance testing using standardized airways (ISO 5801) EN ISO 11925-2, Reaction to fire tests - Ignitability of products subjected to direct impingement of flame - Part 2: Single-flame source
44、 test (ISO 11925-2) EN ISO 12100, Safety of machinery - General principles for design - Risk assessment and risk reduction (ISO 12100) EN ISO 16852:2010, Flame arresters - Performance requirements, test methods and limits for use (ISO 16852:2008, including Cor 1:2008 and Cor 2:2009) EN ISO 13349:201
45、0, Fans - Vocabulary and definitions of categories (ISO 13349:2010) ISO 14694:2003, Industrial fans Specifications for balance quality and vibration levels ISO 14694:2003/AMD1, Industrial fans Specifications for balance quality and vibration levels 3 Terms and definitions For the purposes of this do
46、cument, the terms and definitions given in EN 1127-1:2011, EN ISO 80079-36:2016 and the following apply. 3.1 externally mounted flame arrester flame arrester consisting of a flame arrester housing and flame arrester elements mounted as a separate equipment on the fan 3.2 integrated flame arrester fl
47、ame arrester consisting of a flame arrester housing and flame arrester elements where the flame arrester housing is part of the fan housing 3.3 contact diameter diameter of a rotating part at the point where it can contact a stationary part DIN EN 14986:2017-04 EN 14986:2017 (E) 8 4 Requirements for
48、 all fans 4.1 Ignition hazard assessment 4.1.1 General A list of hazards considered is given in Annex D. These include hazards inside and outside the fan. Where additional hazards could occur an ignition hazard assessment according to EN ISO 80079-36 shall be carried out. For the purposes of fans ma
49、de according to this European Standard the following operational conditions shall be used as a basis for the ignition hazard assessment and for the assignment of a fan to a particular category. Release of flammable material shall be considered in the ignition hazard assessment for the outside of the fan, see 4.3. 4.1.2 Normal operating conditions Normal operating conditions shall be considered to occur in situations where the fan performs its int
