BS EN 13463-6 2005 Non-electrical equipment for potentially explosive atmospheres - Part 6 Protection by control of ignition source b.pdf

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1、BRITISH STANDARDBS EN 13463-6:2005Non-electricalequipment for use in potentially explosive atmospheres Part 6: Protection by control of ignition source bThe European Standard EN 13463-6:2005 has the status of a British StandardICS 13.230g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44

2、g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 13463-6:2005This Brit

3、ish Standard was published under the authority of the Standards Policy and Strategy Committee on 28 July 2005 BSI 28 July 2005ISBN 0 580 46450 4National forewordThis British Standard is the official English language version of EN 13463-6:2005.The UK participation in its preparation was entrusted to

4、Technical Committee FSH/23, Fire precautions in industrial and chemical plant, which has the responsibility to:A list of organizations represented on this committee can be obtained on request to its secretary.Additional informationThe contents of informative Annex C were the subject of considerable

5、debate during the development of this European Standard. Those who are familiar with programmable electronic systems and their potentially complex failure modes see the need for much more detailed advice on designing equipment which has reliable protective systems. As pointed out in Annex C, EN 954-

6、1:1996 does not effectively cover all of the principles described in this European Standard for the purposes of assessing ignition control devices.Those from a mechanical background recognized that very simple devices can sometimes be used as safety systems. If designers were to consider all the iss

7、ues covered in EN 61508 then this would be a barrier to the successful application of the principles found in this European Standard.This European Standard will need review and may be subject to amendment at a later date in the light of the full variety of new products that will be developed using i

8、ts principles and the eventual publication EN 62061.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “

9、Search” facility of the BSI Electronic Catalogue or of British Standards Online.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance with a British Standard does not of itself confer immunity from legal

10、obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK.Summa

11、ry of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 21 and a back cover.The BSI copyright notice displayed in this document indicates when the document was last issued.Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Institute

12、 Of Technology Tallaght, Institute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13463-6April 2005ICS 13.230English versionNon-electrical equipment for use in potentially explosiveatmospheres - Part 6: Protection by con

13、trol of ignition source bAppareils non lectriques destins tre utiliss enatmosphres explosibles - Partie 6: Protection par contrlede la source dinflammation bNicht-elektrische Gerte fr den Einsatz inexplosionsgefhrdeten Bereichen - Teil 6: Schutz durchZndquellenberwachung bThis European Standard was

14、approved by CEN on 15 March 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationa

15、lstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified

16、 to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, N

17、orway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by an

18、y means reservedworldwide for CEN national Members.Ref. No. EN 13463-6:2005: ELicensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13463-6:2005 (E) 2ContentsPage Foreword.3Introduction .41 Scope .62 Normative refer

19、ences .73 Terms and definitions .74 Determination of suitability .75 Determination of the control parameters .86 Ignition prevention system design and settings .87 Ignition protection of sensors and actuators .98 Ignition prevention levels (IPL) of the ignition prevention system .99 Type tests .1110

20、 Instructions for use .1111 Marking .12Annex A (informative) Flow diagram of the procedures described in this document .13Annex B (informative) Thought process used to assign IPLs to different categories of equipment .14Annex C (informative) Background information on EN 954-1 and EN 61508.15Annex ZA

21、 (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC.16Bibliography .21Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13463-6:2005 (E) 3Foreword Th

22、is document (EN 13463-6:2005) has been prepared by 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 i

23、dentical text or by endorsement, at the latest by October 2005, and conflicting national standards shall be withdrawn at the latest by October 2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential

24、 requirements of EU Directive 94/9/EC of 23 March 1994. For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. This document is to specify the requirements for the type of protection Control of ignition sources for equipment intended for use in p

25、otentially explosive atmospheres and should be used in conjunction with EN 13463-1 Non-electrical equipment for potentially explosive atmospheres Part 1: Basic method and requirements”. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries

26、 are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland

27、and United Kingdom. Licensed Copy: Institute Of Technology Tallaght, Institute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13463-6:2005 (E) 4Introduction Many types of non-electrical equipment intended for use in potentially explosive atmospheres of gas, vapour, m

28、ist and/or combustible dust, do not contain an effective ignition source in normal operation. However, there is a risk that an ignition source might arise in such equipment if the moving parts suffer a malfunction or an abnormal operation occurs. An example of this is a fan, having high speed rotati

29、ng blades fixed to a shaft, supported on rolling element bearings, inside a stator. In normal operation, no frictional ignition sources should be present. However, because the clearances between the rotor and stator are very small, malfunctions such as the collapse of a shaft bearing, distortion of

30、a rotating blade, build up of foreign material on a rotating blade, etc. could cause the clearance to be reduced and frictional sparking, or hot surfaces, to occur. To prevent potential ignition sources from becoming effective during normal operation, malfunction and rare malfunction, it is possible

31、 to incorporate sensors into the equipment to detect impending dangerous conditions and initiate control measures at an early stage of deterioration before the potential sources are converted into effective sources. The control measures applied, may be initiated automatically, via direct connections

32、 between the sensors and the ignition prevention system, or manually, by providing a warning to the equipment operator (With the intention of the operator applying the ignition prevention measures e.g. by stopping the equipment). In this document, the incorporation of such sensors and their associat

33、ed automatic/manual ignition prevention measures, to prevent potential ignition sources becoming effective ignition sources, is known as protection by “Control of ignition source b ” This type of ignition protection, and the devices used to achieve it, can take many forms. In practice, they may be m

34、echanical, electrical, optical, visual or a combination of all of these. Although this document deals with the ignition protection of non-electrical equipment, it nevertheless has to take account of the fact that an increasing amount of non-electrical equipment makes use of electrical sensors to det

35、ect and initiate the ignition prevention measures. It is therefore impossible to produce a non-electrical equipment protection standard without making reference to the use of electrical sensors and their associated ignition prevention system circuits. Some examples of mechanical sensor / actuator de

36、vices are: a) fuseable plugs (as used in fluid couplings), that melt to release the energy contained in the power transmission fluid before the temperature of ignition capable parts exceed allowable limits; b) centrifugal speed governors, that directly control the power throttle and prevent rotating

37、 parts attaining frictional ignition capable rotational speeds; c) thermostatic valves, that close to reduce the input energy, or open to increase the amount of coolant, thereby preventing ignition capable temperatures being attained; d) pressure relief valves (using springs or weights), that open t

38、o limit pressure levels and consequent temperature rise during gas compression. Alternatively, to protect against catastrophic failure leading to the exposure of unintended hot surfaces. Some examples of combined electro-mechanical sensor / actuator devices are: e) temperature, flow and level monito

39、ring/control devices, that detect temperature / flow / level and initiate a solenoid valve to reduce the input energy, or increase the amount of coolant, f) optical pulse counters, that sense abnormal rotational speeds on the teeth of gears and send signals to a speed controller, g) vibration sensor

40、s, that detect abnormal vibration, from e.g. rolling element bearings, before they fail (usually indicated by high frequency vibrations), or rotating parts that are becoming out of dynamic balance (usually indicated by low frequency vibrations), Licensed Copy: Institute Of Technology Tallaght, Insti

41、tute of Technology, Mon Jul 23 10:15:31 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13463-6:2005 (E) 5h) conveyor belt alignment devices, that detect unintended frictional rubbing between the moving belt and fixed parts of the supporting structure, i) power transmission belt tension devices, that d

42、etect frictional slippage between the drive pulley and power transmission belt, due to loss of belt tension, j) wear detectors on clutches, which detect unacceptable wear likely to cause frictional heating by incorrect engagement of the clutch. Such sensor / actuator control devices may be either, continuously active in normal operation of the equipment (e.g. to control the temperature of category 3 equipment), or be arranged so that they only detect abnormal operation (e.g. to detect impending dangerous over-temperature in category 2 equipment). As malfunction of any of the above sensors