1、BSI Standards PublicationBS EN 16447:2014Explosion isolation flap valvesBS EN 16447:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 16447:2014. The UK participation in its preparation was entrusted to TechnicalCommittee EXL/23, Explosion and fire precaution
2、s in industrial and chemical plant.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Insti
3、tution 2014.Published by BSI Standards Limited 2014ISBN 978 0 580 79756 9ICS 13.230; 23.060.50Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2014.Amendm
4、ents/corrigenda issued since publicationDate Text affectedBS EN 16447:2014EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 16447 July 2014 ICS 13.230; 23.060.50 English Version Explosion isolation flap valves Vanne clapet disolation dexplosion Rckschlagklappen zur explosionstechnischen Entkopplu
5、ngThis European Standard was approved by CEN on 28 May 2014. 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. Up-to-date lists and bibliographical refer
6、ences 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 in any other language made by translation under the responsibility of a CEN
7、 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
8、, 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. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISC
9、HES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 16447:2014 EBS EN 16447:2014EN 16447:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Norma
10、tive references 4 3 Terms and definitions .5 4 Explosion isolation flap valves 6 4.1 General 6 4.2 Mechanical integrity 6 5 Experimental testing of efficacy and mechanical integrity .6 5.1 General 6 5.2 Test Modules 7 5.2.1 General 7 5.2.2 Module A: Explosion resistance testing .7 5.2.3 Module B: Fl
11、ame transmission testing 8 5.2.4 Module C: Functional testing .9 5.3 Testing report 12 6 Information for use . 13 7 Marking 14 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC . 15 Bibliography . 16 BS EN 16447:2014EN 16447:201
12、4 (E) 3 Foreword This document (EN 16447:2014) 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 pu
13、blication of an identical text or by endorsement, at the latest by January 2015 and conflicting national standards shall be withdrawn at the latest by January 2015. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELE
14、C shall not be held responsible for identifying any or all such patent rights. 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
15、), see informative Annex ZA, which is an integral part 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, Denm
16、ark, 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. BS EN 16447:20
17、14EN 16447:2014 (E) 4 1 Scope This European Standard describes the general requirements for flap valves used for dust explosion isolation. An explosion isolation flap valve is a protective system, which prevents a dust explosion from propagating via connecting pipes or ducts into other parts of appa
18、ratus or plant areas. An explosion isolation flap valve can only stop the propagation of a dust explosion when it propagates against the direction of the normal process flow. It does not stop explosions running in the normal process flow direction. This European Standard specifies methods for evalua
19、ting the efficacy of explosion isolation flap valves. This European Standard is applicable only to explosion isolation flap valves which are intended to avoid explosion propagation from a vessel, into other parts of the installation via connecting pipes or ducts. The standard covers isolation of suc
20、h vessels that are protected by explosion venting (including flameless venting), explosion suppression or explosion resistant design. NOTE 1 This standard is only applicable to cases where the explosion starts in a vessel and not in pipes or ducting. Explosion isolation flap valves are not designed
21、to prevent the transmission of fire or burning powder transported by the normal process flow. NOTE 2 It is necessary to take this into account in risk assessments. This European Standard is only applicable for dust explosions. This European Standard is not applicable for explosions of materials list
22、ed below, or for mixtures containing some of those materials: a) gases, vapours and hybrid mixtures; b) chemically unstable substances; c) explosive substances; d) pyrotechnic substances. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document
23、 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 13237, Potentially explosive atmospheres - Terms and definitions for equipment and protective
24、 systems intended for use in potentially explosive atmospheres EN 14373, Explosion suppression systems EN 14460, Explosion resistant equipment EN 15089, Explosion isolation systems BS EN 16447:2014EN 16447:2014 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definition
25、s given in EN 13237, EN 14373, EN 15089 and the following apply. 3.1 explosion isolation flap valve valve containing a flap which is fixed to the housing on an axis perpendicular to the flow direction, kept open by the process flow and able to stop explosions from propagating through pipelines in th
26、e direction opposite to the normal process flow through the valve Note 1 to entry: This definition partially modifies that given in EN 13237. 3.2 explosion source vessel from which the explosion originates 3.3 push flow situation situation where the fan is located upstream (with reference to the dir
27、ection of the normal process flow) of the explosion source a) b) Key 1 fan 2 explosion isolation flap valve 3 vessel Figure 1 Push flow situation BS EN 16447:2014EN 16447:2014 (E) 6 3.4 pull flow situation situation where the fan is located downstream (with reference to the direction of the normal p
28、rocess flow) of the explosion source Figure 2 Pull flow situation 4 Explosion isolation flap valves 4.1 General An explosion isolation flap valve is a protective system, which prevents a dust explosion from propagating via connecting pipes or ducts into other parts of apparatus or plant areas. It is
29、 installed such that the normal process air flow passes in one direction through the valve and keeps it open. It closes when the air flow reverses due to a dust explosion event. The valve shall stay closed long enough to avoid flames from transmitting during an explosion event (see Note 1). Explosio
30、n isolation shall also be ensured during periods without process flow. NOTE 1 Re-opening of the valve is possible e. g. due to pressure oscillations caused by the fan or the venting process. Explosion isolation flap valves are designed to be connected to ducting. The valve housing is fitted with inl
31、et and outlet connections to connect with the ducting. NOTE 2 Adapters are often used to connect to an oversize valve. 4.2 Mechanical integrity Any part of an explosion isolation flap valve shall be constructed such that it can withstand the loads imposed by any explosion that can be expected in acc
32、ordance with its intended use, without losing its ability to perform its safety function. The construction can be either explosion-pressure resistant or explosion-pressure shock-resistant in accordance with EN 14460. NOTE The explosion pressure acting on the explosion isolation flap valve may be hig
33、her than the (reduced) explosion pressure in the connected vessel as a result of pressure piling and/or flame acceleration through the ducting. 5 Experimental testing of efficacy and mechanical integrity 5.1 General The testing shall reflect the intended use. As a minimum the following information i
34、s necessary prior to testing: BS EN 16447:2014EN 16447:2014 (E) 7 a) a general type-description; b) intended use; 1) ambient conditions external to the flap valve and process conditions internal to the flap valve (e. g. temperature range, flow velocity, maximum allowable dust concentrations in the p
35、rocess flow); 2) dust combustion properties, specifically KSt, pmax, metal dust yes/no, MIE, MIT; 3) explosion protection measure of the connected vessel venting (including type of explosion venting device (re-closing device / non-re-closing device), suppression, explosion pressure resistant constru
36、ction); 4) smallest and largest volume of the vessel in which the explosion starts ; 5) specific product characteristics (such as sticky material, moisture content, abrasive, corrosive, toxic, tendency for product built-up); 6) installation requirements (push-, pull flow situations; minimum and maxi
37、mum installation distance; presence of bends/pipe restrictions; inclination); c) installation and operating instructions; d) part list; e) approval drawings, system layout; f) explosion resistance of the explosion isolation flap valve. 5.2 Test Modules 5.2.1 General The experimental testing consists
38、 of three main modules: Module A: Explosion resistance testing; Module B: Flame transmission testing; Module C: Functional testing. Explosion isolation flap valves shall in principle be tested according to all three modules but where possible the modules can be combined. If a combination is chosen,
39、the critical test conditions from the various modules shall be covered in the combination. For an untested new explosion isolation flap valve module C shall always be carried out. 5.2.2 Module A: Explosion resistance testing Explosion resistance shall be confirmed by explosion testing according to t
40、he following procedure: 1) Test arrangement: The explosion isolation flap valve is mounted to a test vessel according to Figure 3. The explosive atmosphere inside the test vessel and the pipe connecting the valve may be of any type (gas or dust), provided the pressure generated is sufficient to subj
41、ect the valve to the required pressure. The BS EN 16447:2014EN 16447:2014 (E) 8 valve shall be held in fully open position and released at the moment of ignition and shall close due to the explosion; 2) Test assignment/records: As a minimum, the maximum pressure recorded at the location of the valve
42、; 3) Number of tests: Minimum 1 per size tested. For devices constructed in the same way (with respect to the geometrical similarity, material specifications, welding specifications or specifications of other ways of connecting parts, and wall thickness) only the largest size needs to be tested; 4)
43、Evaluation: Permanent deformation is allowed provided the valve does not fail in its function and will not give rise to dangerous effects to the surrounding. No permanent deformation is allowed for brittle material. The maximum pressure recorded at the location of the valve corrected according to EN
44、 14460. Key 1 Test vessel 3 Pressure Transducer (Pt) 2 Explosion Isolation Flap Valve 4 Explosion vent Figure 3 Test arrangement for explosion pressure resistance testing 5.2.3 Module B: Flame transmission testing The main objective of the flame transmission testing is to verify that the explosion i
45、solation flap valve is able to prevent explosion flames from propagating past the explosion isolation flap valve. The tests shall expose the explosion isolation flap valve to the maximum reduced explosion overpressure as indicated in the intended use and a lower one (see “3) number of tests”) and sh
46、all include conditions where the valve is open and closed. If there is a locking mechanism it shall not be locked in the closed position before ignition. 1) Test arrangement: The test arrangement shall be similar to the one shown in Figure 4. The size of the vessel shall reflect the intended use of
47、the device. The explosive atmosphere in the vessel shall represent an explosibility similar to the highest KStas specified by the intended use. It has to be assured that the flame reaches the position of the valve. The test arrangement shall include a duct in case it is expected that ducting on the
48、side not exposed to the dust explosion of the valve will affect the closing time of the valve. No additional tests with elbows or restrictions are required if the intended use BS EN 16447:2014EN 16447:2014 (E) 9 specifies a straight duct (with a length of at least 5 times the diameter) on the explos
49、ion isolation flap valve side which is not exposed to the dust explosion. In addition to the pressure sensor as indicated in Figure 4 a minimum of one flame detector (Ft) on the duct between the vessel and explosion isolation flap valve and one for monitoring flame transmission located max. 100 mm away from the valve on the side not exposed to the dust explosion are used provided a duct is mounted at the explosion isolation flap valve side not exposed to the dust explosion. It shall be assured that this flame detector only detects flames and sparks (burning
