CEN TR 16829-2016 Fire and explosion prevention and protection for bucket elevators.pdf

1、PD CEN/TR 16829:2016Fire and explosion preventionand protection for bucketelevatorsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06PD CEN/TR 16829:2016 PUBLISHED DOCUMENTNational forewordThis Published Document is the UK implementation of CEN/TR16829:2016.Earlier gui

2、dance on protection of bucket elevators from internaldust explosions was based on large scale experimental work carriedout by the Health and Safety Laboratory and was published in the IChem E guide to dust explosions. Since then many bucket elevatorshave been fitted with explosion protection based o

3、n this advice, asa result the number of explosions in bucket elevators has reduced inrecent years. This seems likely to be the consequence of improvedcontrols over ignition sources in the elevators, as described in thisTR.The UK committee cannot see a justification for retrofitting olderelevators bu

4、ilt to I Chem E guidelines in order to meet the ventingadvice in this TR. Moreover, provided the details of an installationclosely follow that used in the HSL research, a bucket elevator fitted with vents according to the I Chem E guide, and other features as described in this TR, then it should mee

5、t the requirements of DSEAR, and the reasonably practical precautions required by theHSW Act. The Approved Code of Practice and further guidance on the Regulations can be found in HSE publication L138.The UK participation in its preparation was entrusted to TechnicalCommittee EXL/23/1, Flame arreste

6、rs.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2016.Published by BSI Standa

7、rds Limited 2016ISBN 978 0 580 89235 6ICS 13.220.40; 13.230; 53.040.10Compliance with a British Standard cannot confer immunity fromlegal obligations.This Published Document was published under the authority of the Standards Policy and Strategy Committee on 31 October 2016.Amendments/corrigenda issu

8、ed since publicationDate Text affectedPD CEN/TR 16829:2016TECHNICAL REPORT RAPPORT TECHNIQUE TECHNISCHER BERICHT CEN/TR 16829 August 2016 ICS 13.220.40; 13.230; 53.040.10 English Version Fire and explosion prevention and protection for bucket elevators Prvention et protection contre lincendie et lex

9、plosion des lvateurs godets Brand- und Explosionsschutz fr Becherwerke This Technical Report was approved by CEN on 13 July 2015. It has been drawn up by the Technical Committee CEN/TC 305. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic,

10、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 andUnited Kingdom. EUROPEAN COMMIT

11、TEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR 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 worldwide for CEN national Members. Ref. No. CEN/TR 16829:2016 EPD CEN/TR 1

12、6829:2016CEN/TR 16829:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Bucket elevators 6 4.1 General 6 4.2 Bucket elevator types 6 5 Fire and explosion hazards 6 5.1 General 6 5.2 Explosion hazards . 7 5.2.1 Presence of explosive atmosp

13、heres . 7 5.2.2 Presence of potential ignition sources 8 5.2.3 Effect of ignition: smouldering product, fire, explosion, propagation of explosion 10 5.2.4 Risk assessment 10 5.3 Fire hazards 10 6 Fire and explosion prevention and protection of bucket elevators 11 6.1 General . 11 6.2 Fire prevention

14、 and protection . 12 6.2.1 Fire prevention . 12 6.2.2 Fire protection 12 6.3 Explosion prevention and protection . 13 6.3.1 Prevention of explosive atmospheres 13 6.3.2 Prevention of ignition sources 14 6.3.3 Protective measures . 19 7 Information for use . 19 7.1 Markings 21 Annex A (informative) E

15、xamples/types of bucket elevators . 22 Annex B (informative) Guidance on explosion venting . 28 Annex C (informative) Guidance on explosion suppression 33 Annex D (informative) Example of an ignition hazard assessment 36 Annex E (informative) Example of a nameplate . 61 Annex F (informative) Guidanc

16、e for assessing the probability of generating explosive atmospheres 62 Bibliography . 63 PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 3 European foreword This document (CEN/TR 16829:2016) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres Explosion prevention and pro

17、tection”, the secretariat of which is held by DIN. 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. PD CEN/TR 16829:2016CEN/TR 16829:20

18、16 (E)PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 2 Contents Page European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 5 4 Bucket elevators 6 4.1 General 6 4.2 Bucket elevator types 6 5 Fire and explosion hazards 6 5.1 General 6 5.2 Explosion hazards . 7 5.2.1 Presence of

19、 explosive atmospheres . 7 5.2.2 Presence of potential ignition sources 8 5.2.3 Effect of ignition: smouldering product, fire, explosion, propagation of explosion 10 5.2.4 Risk assessment 10 5.3 Fire hazards 10 6 Fire and explosion prevention and protection of bucket elevators 11 6.1 General . 11 6.

20、2 Fire prevention and protection . 12 6.2.1 Fire prevention . 12 6.2.2 Fire protection 12 6.3 Explosion prevention and protection . 13 6.3.1 Prevention of explosive atmospheres 13 6.3.2 Prevention of ignition sources 14 6.3.3 Protective measures . 19 7 Information for use . 19 7.1 Markings 21 Annex

21、A (informative) Examples/types of bucket elevators . 22 Annex B (informative) Guidance on explosion venting . 28 Annex C (informative) Guidance on explosion suppression 33 Annex D (informative) Example of an ignition hazard assessment 36 Annex E (informative) Example of a nameplate . 61 Annex F (inf

22、ormative) Guidance for assessing the probability of generating explosive atmospheres 62 Bibliography . 63 PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 3 European foreword This document (CEN/TR 16829:2016) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres Explosion p

23、revention and protection”, the secretariat of which is held by DIN. 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. PD CEN/TR 16829:20

24、16CEN/TR 16829:2016 (E)PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 4 1 Scope This European Technical Report applies to bucket elevators that may handle combustible products capable of producing potentially explosive atmospheres of dust or powder inside the bucket elevator during its operation. The pre

25、cautions to control ignition sources will also be relevant where the product in the bucket elevator creates a fire risk but not an explosion risk. For the purposes of this report, a bucket elevator is defined as an item of bulk material handling equipment that carries material in powder form or as c

26、oarse products such as whole grain, wood chips or flakes, in a vertical direction by means of a continuous movement of open containers. This Technical Report specifies the principles of and guidance for fire and explosion prevention and explosion protection for bucket elevators. Prevention is based

27、on the avoidance of effective ignition sources, either by the elimination of ignition sources or the detection of ignition sources. Explosion protection is based on the application of explosion venting, explosion suppression or explosion containment and explosion isolation rules specifically adapted

28、 for bucket elevators. These specific rules may be based on agreed test methods. This European Technical Report does not apply to products that do not require atmospheric oxygen for combustion. 2 Normative references The following documents, in whole or in part, are normatively referenced in this do

29、cument 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 1127-1:2011, Explosive atmospheres Explosion prevention and protection Part 1: Basic co

30、ncepts and methodology EN 13237, Potentially explosive atmospheres Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres EN 13463-1, Non-electrical equipment for use in potentially explosive atmospheres Part 1: Basic method and requirements

31、EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres Part 5: Protection by constructional safety c EN 13463-6, Non-electrical equipment for use in potentially explosive atmospheres Part 6: Protection by control of ignition source b EN 14373, Explosion suppressio

32、n systems EN 14460, Explosion resistant equipment EN 14797, Explosion venting devices EN 14491, Dust explosion venting protective systems EN 15089, Explosion isolation systems EN 60079-10-2, Explosive atmospheres Part 10-2: Classification of areas Combustible dust atmospheres PD CEN/TR 16829:2016CEN

33、/TR 16829:2016 (E) 5 EN ISO 12100, Safety of machinery General principles for design Risk assessment and risk reduction (ISO 12100) ISO 281, Rolling bearings Dynamic load ratings and rating life IEC/TS 60079-32-1, Explosive atmospheres Part 32-1: Electrostatic hazards, Guidance VDI 2263-1, Dust fire

34、s and dust explosions; hazards, assessment, protective measures; test methods for the determination of the safety characteristic of dusts 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13237, EN 15089 and the following apply. Note 1 to entry: The zon

35、es for the classification of hazardous areas are defined in Directive 1999/92/EC. 3.1 volume 3.1.1 bucket elevator leg volume internal volume of pipe section connecting head to the boot 3.1.2 bucket elevator head volume internal volume above the leg connection, including outlet section and excluding

36、 the volume of the pulley Note 1 to entry: Attached chutes are not included. 3.1.3 bucket elevator boot volume internal volume below the leg connection, including inlet section and excluding the volume of the pulley 3.2 vent spacing distance between vents measured from centre to centre 3.3 bucket sp

37、acing distance between buckets measured from centre to centre 3.4 combustible dust finely divided solid particles, 500 m or less in nominal size, which may be suspended in air, may settle out of the atmosphere under their own weight, which can burn or glow in air, and may form explosive mixtures wit

38、h air at atmospheric pressure and normal temperatures PD CEN/TR 16829:2016CEN/TR 16829:2016 (E)PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 4 1 Scope This European Technical Report applies to bucket elevators that may handle combustible products capable of producing potentially explosive atmospheres of

39、 dust or powder inside the bucket elevator during its operation. The precautions to control ignition sources will also be relevant where the product in the bucket elevator creates a fire risk but not an explosion risk. For the purposes of this report, a bucket elevator is defined as an item of bulk

40、material handling equipment that carries material in powder form or as coarse products such as whole grain, wood chips or flakes, in a vertical direction by means of a continuous movement of open containers. This Technical Report specifies the principles of and guidance for fire and explosion preven

41、tion and explosion protection for bucket elevators. Prevention is based on the avoidance of effective ignition sources, either by the elimination of ignition sources or the detection of ignition sources. Explosion protection is based on the application of explosion venting, explosion suppression or

42、explosion containment and explosion isolation rules specifically adapted for bucket elevators. These specific rules may be based on agreed test methods. This European Technical Report does not apply to products that do not require atmospheric oxygen for combustion. 2 Normative references The followi

43、ng 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 1127-1:2011, Ex

44、plosive atmospheres Explosion prevention and protection Part 1: Basic concepts and methodology EN 13237, Potentially explosive atmospheres Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres EN 13463-1, Non-electrical equipment for use in

45、potentially explosive atmospheres Part 1: Basic method and requirements EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres Part 5: Protection by constructional safety c EN 13463-6, Non-electrical equipment for use in potentially explosive atmospheres Part 6: P

46、rotection by control of ignition source b EN 14373, Explosion suppression systems EN 14460, Explosion resistant equipment EN 14797, Explosion venting devices EN 14491, Dust explosion venting protective systems EN 15089, Explosion isolation systems EN 60079-10-2, Explosive atmospheres Part 10-2: Clas

47、sification of areas Combustible dust atmospheres PD CEN/TR 16829:2016CEN/TR 16829:2016 (E) 5 EN ISO 12100, Safety of machinery General principles for design Risk assessment and risk reduction (ISO 12100) ISO 281, Rolling bearings Dynamic load ratings and rating life IEC/TS 60079-32-1, Explosive atmo

48、spheres Part 32-1: Electrostatic hazards, Guidance VDI 2263-1, Dust fires and dust explosions; hazards, assessment, protective measures; test methods for the determination of the safety characteristic of dusts 3 Terms and definitions For the purposes of this document, the terms and definitions given

49、 in EN 13237, EN 15089 and the following apply. Note 1 to entry: The zones for the classification of hazardous areas are defined in Directive 1999/92/EC. 3.1 volume 3.1.1 bucket elevator leg volume internal volume of pipe section connecting head to the boot 3.1.2 bucket elevator head volume internal volume above the leg connection, including outlet section and excluding the volume of the pulley Note 1 to entry: Attached chutes are not included. 3.1.3 bucket elevator boot volume internal volume below the leg conne