BS EN 15089-2009 Explosion isolation systems《爆炸阻绝系统》.pdf

1、BS EN 15089:2009ICS 13.230NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDExplosion isolationsystemsThis British Standardwas published under theauthority of the StandardsPolicy and StrategyCommittee on 30 April2009 BSI 2009ISBN 978 0 580 54835 2Amendments/corrig

2、enda issued since publicationDate CommentsBS EN 15089:2009National forewordThis British Standard is the UK implementation of EN 15089:2009.The UK participation in its preparation was entrusted to TechnicalCommittee FSH/23, Fire precautions in industrial and chemical plant.A list of organizations rep

3、resented on this committee can be obtained onrequest to its secretary.This publication does not purport to include all the necessary provisionsof a contract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunityfrom legal obligations.BS EN 15089:

4、2009EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 15089March 2009ICS 13.230English VersionExplosion isolation systemsSystme disolation dexplosion Explosions-EntkopplungssystemeThis European Standard was approved by CEN on 7 February 2009.CEN members are bound to comply with the CEN/CENELEC Inter

5、nal 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 nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member

6、.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 to the CEN Management Centre has the same status as theofficial versions.CEN members are

7、 the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerla

8、nd and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: Avenue Marnix 17, B-1000 Brussels 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15089:2

9、009: EBS EN 15089:2009EN 15089:2009 (E) 2 Contents Page Foreword 4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Explosion isolation systems 8 4.1 General 8 4.2 Isolation types 8 4.2.1 Passive isolation type .8 4.2.2 Active isolation type 8 5 Requirements of explosion isolation com

10、ponents 8 5.1 General 8 5.2 Detection devices 9 5.2.1 General 9 5.2.2 Optical detection 9 5.2.3 Pressure detection.9 5.2.4 Other actuation 9 5.3 Indicating equipment (IE) and control and indicating equipment (CIE) .9 5.3.1 General 9 5.3.2 Indicating equipment .9 5.3.3 Control and indicating equipmen

11、t .9 5.4 Safety integrity of control and indicating equipment (CIE) 10 5.4.1 General . 10 5.4.2 Measures to avoid and control systematic faults . 10 5.4.3 Control of electric connections . 10 5.4.4 Indicators and messages on CIE 10 5.4.5 Energy supply . 10 5.5 Explosion isolation devices . 10 5.5.1

12、General . 10 5.5.2 Explosion protection valve (active or passive) F b) evaluating the effectiveness of an explosion isolation system; c) evaluating design tools for explosion isolation systems. This European Standard is applicable only to the use of explosion isolation systems that are intended for

13、avoiding explosion propagation between interconnected enclosures, in which an explosion may result as a consequence of ignition of an explosive mixtures e.g., dust-air mixtures, gas-(vapour-)air mixtures, dust-, gas-(vapour-)air mixtures and mists. In general explosion isolation systems are not desi

14、gned to prevent the transmission of fire or burning powder either of which can initiate an explosion in downstream plant items. It is necessary to take this situation into account in risk assessments. This European Standard is only applicable for gas and dust explosions of chemically stable substanc

15、es and mixtures of these (flame propagating at subsonic velocity). This European Standard is not applicable for explosions of materials listed below, or for mixtures containing some of those materials: i) chemically unstable substances that are liable to decompose; ii) explosive substances; iii) pyr

16、otechnic substances. This European Standard does not cover flame arresters. For these devices refer to EN 12874. 2 Normative references The following reference documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated referenc

17、es, the latest edition of the referenced document (including any amendments) applies. EN 12874:2001, Flame arresters Performance requirements, test methods and limits for use EN 13237, Potentially explosive atmospheres Terms and definitions for equipment and protective systems intended for use in po

18、tentially explosive atmospheres EN 13673-1, Determination of the maximum explosion pressure and the maximum rate of pressure rise of gases and vapours Part 1: Determination of the maximum explosion pressure BS EN 15089:2009EN 15089:2009 (E) 6 EN 13673-2, Determination of maximum explosion pressure a

19、nd the maximum rate of pressure rise of gases and vapours Part 2: Determination of the maximum rate of explosion pressure rise EN 14034-1, Determination of explosion characteristics of dust clouds Part 1: Determination of the maximum explosion pressure pmaxof dust clouds EN 14034-2, Determination of

20、 explosion characteristics of dust clouds Part 2: Determination of the maximum rate of explosion pressure rise (dp/dt)maxof dust clouds EN 14373, Explosion suppression systems 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13237, EN 14373 and the fol

21、lowing apply. 3.1 indicating equipment IE explosion protection equipment, which monitors the explosion sensors/detectors and the explosion protection devices 3.2 closing time time needed for closing an isolation device 3.3 closing time of the system sum of the activation time of sensor, activation t

22、ime of isolation device and closing time of the isolation device 3.4 design strength of enclosure p (plant strength) 3.4.1 explosion-pressure-resistant property of vessels and equipment designed to withstand the expected explosion pressure without becoming permanently deformed EN 13237:2003, 3.31 3.

23、4.2 explosion-pressure-shock-resistant property of vessels and equipment designed to withstand the expected explosion pressure without rupturing, but allowing permanent deformation EN 13237:2003, 3.32 3.5 explosion abrupt oxidation or decomposition reaction producing an increase in temperature, pres

24、sure, or in both simultaneously EN 13237:2003, 3.28 3.6 explosion diverter mechanical device, which will divert the explosion to a safe area NOTE It prevents flame jet ignition and pressure piling but cannot effectively stop explosions from travelling. BS EN 15089:2009EN 15089:2009 (E) 7 3.7 explosi

25、on isolation system 3.7.1 active explosion isolation system system which is designed to stop explosions from travelling through pipelines or limit the associated destructive effects of the explosion and is activated by detectors and a control and indicating equipment (CIE), which are parts of the sy

26、stem 3.7.2 passive explosion isolation system system which is designed to stop explosions from travelling through pipelines or limit the associated destructive effects of the explosion and does not require detectors and a control and indicating equipment (CIE) 3.8 explosion isolation valve fast acti

27、ng valve able to stop explosions from travelling through pipelines 3.9 explosion proof interlocked double valve arrangement device, which will act in closed position as isolation valve 3.10 explosion isolation flap hinged door which is kept in open position by the air flow and closes by gravity when

28、 the air flow is interrupted 3.11 extinguishing barrier system that is used to discharge suppressant agent into ductwork to isolate a flame and keep it from propagating to other process areas 3.12 extinguishing distance needed distance behind an extinguishing barrier to guarantee a proper isolation

29、of the flame of an explosion 3.13 flame arrester device fitted to the opening of an enclosure or to the connecting pipework of a system of enclosures and whose intended function is to allow flow but prevent the transmission of flame EN 12874:2001, 3.1.1 3.14 flame velocity Sfvelocity of a flame fron

30、t relative to a fixed reference point 3.15 installation distance 3.15.1 maximum installation distance longest distance from the outlet of the enclosure with the potential explosion to the isolation system, which is limited by the explosion resistance of the isolation device or pipe but still guarant

31、eeing a successful isolation 3.15.2 minimum installation distance shortest distance from the outlet of the enclosure with the potential explosion to the isolation system guaranteeing a successful isolation BS EN 15089:2009EN 15089:2009 (E) 8 3.16 minimum ignition energy MIE lowest energy which is su

32、fficient to effect ignition of the most easily ignitable explosive atmosphere under specified test conditions EN 13237:2003, 3.85 3.17 minimum ignition temperature of an explosive atmosphere MIT ignition temperature of a combustible gas or of a vapour of a combustible liquid or the minimum ignition

33、temperature of a dust cloud under specified test conditions 3.18 response time time necessary for actuation of the system after a detection of an explosion 4 Explosion isolation systems 4.1 General Explosion isolation is achieved by a protective system, which prevents an explosion pressure wave and

34、a flame or only a flame from propagating via connecting pipes or ducts into other parts of apparatus or plant areas. Systems providing complete isolation by operation of the isolation device(s) prevent the propagation of the flame as well as pressure effects. Systems providing partial isolation only

35、 isolate the flame propagation. This distinction is important for practical application, because it is not necessary in all cases to achieve a complete isolation of flame and pressure. In some cases it is sufficient to achieve only flame isolation. 4.2 Isolation types 4.2.1 Passive isolation type Pa

36、ssive isolation systems do not require the addition of detection and control and indicating equipment to function. 4.2.2 Active isolation type Active isolation systems require detection and control and indicating equipment to function. Detection systems are systems usually based on optical or pressu

37、re sensors. 5 Requirements of explosion isolation components 5.1 General To prevent an explosion occurring in a protected installation from spreading through a pipeline to another part of the installation, explosion isolation measures shall be implemented. Therefore isolation is normally installed i

38、nto a pipe which connects two enclosures. It can also be located immediately after equipment e.g., a rotary valve underneath the cone of a filter or silo. As explosions are generally propagated by flames and not by the pressure waves, it is especially important to detect, extinguish or block this fl

39、ame front at an early stage, i.e. to isolate the explosion. BS EN 15089:2009EN 15089:2009 (E) 9 5.2 Detection devices 5.2.1 General To initiate an active explosion isolation system one or more detectors are used to detect either an explosion pressure wave or flame of a propagating explosion. Each de

40、tector provides a signal to the CIE unit. It is important to locate the detector in its correct position, to ensure sufficient time for the isolation system to detect and activate the isolation device to stop the explosion. NOTE In many cases it is favourable to use a combination of a pressure detec

41、tor in the enclosure and an optical detector in the pipe, and they should be switched in an OR-type of logic for activating the isolation device. 5.2.2 Optical detection Detection of a flame can be achieved using UV, IR or visible radiation sensors. It is important to mount the detector so that the

42、angle of vision allows it to cover the full area to be monitored. The performance of an optical sensor will also be affected by any obstacles within its vision, which can be overcome by the introduction of more detectors. It shall be assured that the optical lenses of the sensors are kept clean, e.g

43、. by air shields. 5.2.3 Pressure detection Threshold detectors provide a signal when a pre-set overpressure pa(the systems activation pressure) is exceeded. Dynamic detectors have rate-of-pressure rise triggering points and may include additional pressure threshold triggering points. Although this t

44、ype of detector minimises spurious activation of the isolation system (due to pressure fluctuations other than explosion pressure rise), care shall be taken to set-up such detectors to meet appropriate detection response criteria for the particular application and protected geometry. 5.2.4 Other act

45、uation Bursting discs, vent panels or explosion doors can be fitted with switches or break wires, which actuate an isolation system. 5.3 Indicating equipment (IE) and control and indicating equipment (CIE) 5.3.1 General Whether control and indicating equipment (CIE) or so-called indicating equipment

46、 (IE) is to be used on an isolation device/system is dependant on the type of protection device. IE will only indicate the status of the device; CIE will actively control the operation of the protection device and provide status indication of the device and is therefore critical for the correct func

47、tioning of the device/system. 5.3.2 Indicating equipment Indicating equipment (IE) monitors and provides the status indication only of the isolation device/system. 5.3.3 Control and indicating equipment Control and indicating equipment (CIE) records and monitors the signals transmitted by the system

48、 detectors. Dependent on configuration, by interrogation and interpretation of the detector data the CIE selectively controls the actuation of protection device, process equipment shut down (direct or indirect) and all audible and visual alarms. System internal monitoring gives fault indication in t

49、he event of device or field wiring defect, and alarm and fault relay contacts shall be connected as appropriate. Emergency standby power shall be facilitated such that full explosion protection is assured during any power failure. System isolation to facilitate safe working on or in a protected enclosure shall be implemented. BS EN 15089:2009EN 15089:2009 (E) 10 5.4 Safety integrity of control and indicating equipment (CIE) 5.4.1 General The following requirements are intended to ensure the safety integrity for active systems. 5.4.2 Measures to avoid and