1、September 2014Translation by DIN-Sprachendienst.English price group 11No 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).I
2、CS 23.060.50; 13.230!%:I“2239638www.din.deDDIN EN 16447Explosion isolation flap valves;English version EN 16447:2014,English translation of DIN EN 16447:2014-09Rckschlagklappen zur explosionstechnischen Entkopplung;Englische Fassung EN 16447:2014,Englische bersetzung von DIN EN 16447:2014-09Vanne cl
3、apet disolation dexplosion;Version anglaise EN 16447:2014,Traduction anglaise de DIN EN 16447:2014-09www.beuth.deIn case of doubt, the German-language original shall be considered authoritative.Document comprises 18 pages08.14 DIN EN 16447:2014-09 2 A comma is used as the decimal marker. National fo
4、reword This standard includes safety requirements. This document (EN 16447:2014) has been prepared by Technical Committee CEN/TC 305 “Potentially explosive atmospheres Explosion prevention and protection” (Secretariat: DIN, Germany). The responsible German body involved in its preparation was the No
5、rmenausschuss Sicherheitstechnische Grundstze (DIN Standards Committee Safety Design Principles), Working Committee NA 095-02-01 AA Explosionsschutzeinrichtungen (auer Flammendurchschlagsicherungen). EN 16447July 2014 ICS 13.230; 23.060.50 English Version Explosion isolation flap valves Vanne clapet
6、 disolation dexplosion Rckschlagklappen zur explosionstechnischen EntkopplungThis 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
7、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
8、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, Czech
9、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey andUnited Kingdom. CEN-
10、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 EEUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGEUROPEA
11、N STANDARDNORME EUROPENNEEUROPISCHE NORMEN 16447:2014 (E) 2 Contents Page Foreword 3 1 Scope 4 2 Normative 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
12、 5.2 Test Modules 7 5.2.1 General 7 5.2.2 Module A: Explosion resistance testing .7 5.2.3 Module B: Flame 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
13、the Essential Requirements of EU Directive 94/9/EC . 15 Bibliography . 16 DIN EN 16447:2014-09EN 16447:2014 (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 w
14、hich is held by DIN. This European Standard shall be given the status of a national standard, either by publication 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 pos
15、sibility 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. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade
16、 Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), 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 bo
17、und to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portug
18、al, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. DIN EN 16447:2014-09EN 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 s
19、ystem, which prevents a dust explosion from propagating via connecting pipes or ducts into other parts of apparatus 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 sto
20、p explosions running in the normal process flow direction. This European Standard specifies methods for evaluating 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 ve
21、ssel, into other parts of the installation via connecting pipes or ducts. The standard covers isolation of such 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 t
22、he explosion starts in a vessel and not in pipes or ducting. Explosion isolation flap valves are not designed 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
23、only applicable for dust explosions. This European Standard is not applicable for explosions of materials listed 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
24、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 references, the latest edition of the referenced document (including any amendme
25、nts) applies. EN 13237, Potentially explosive atmospheres - Terms and definitions for equipment and protective systems intended for use in potentially explosive atmospheres EN 14373, Explosion suppression systems EN 14460, Explosion resistant equipment EN 15089, Explosion isolation systems DIN EN 16
26、447:2014-09EN 16447:2014 (E) 5 3 Terms and definitions For the purposes of this document, the terms and definitions 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
27、flow direction, kept open by the process flow and able to stop explosions from propagating through pipelines in the 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 e
28、xplosion originates 3.3 push flow situation situation where the fan is located upstream (with reference to the direction 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 DIN EN 16447:2014-09EN 16447:2014 (E) 6
29、3.4 pull flow situation situation where the fan is located downstream (with reference to the direction of the normal process 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 preven
30、ts a dust explosion from propagating via connecting pipes or ducts into other parts of apparatus or plant areas. It is 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
31、valve shall stay closed long enough to avoid flames from transmitting during an explosion event (see Note 1). Explosion 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
32、process. Explosion isolation flap valves are designed to be connected to ducting. The valve housing is fitted with inlet 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 fla
33、p valve shall be constructed such that it can withstand the loads imposed by any explosion that can be expected in accordance 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-resi
34、stant in accordance with EN 14460. NOTE The explosion pressure acting on the explosion isolation flap valve may be higher 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
35、 mechanical integrity 5.1 General The testing shall reflect the intended use. As a minimum the following information is necessary prior to testing: DIN EN 16447:2014-09EN 16447:2014 (E) 7 a) a general type-description; b) intended use; 1) ambient conditions external to the flap valve and process con
36、ditions internal to the flap valve (e. g. temperature range, flow velocity, maximum allowable dust concentrations in the process 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
37、of explosion venting device (re-closing device / non-re-closing device), suppression, explosion pressure resistant construction); 4) smallest and largest volume of the vessel in which the explosion starts ; 5) specific product characteristics (such as sticky material, moisture content, abrasive, cor
38、rosive, toxic, tendency for product built-up); 6) installation requirements (push-, pull flow situations; minimum and maximum installation distance; presence of bends/pipe restrictions; inclination); c) installation and operating instructions; d) part list; e) approval drawings, system layout; f) ex
39、plosion resistance of the explosion isolation flap valve. 5.2 Test Modules 5.2.1 General The experimental testing consists of three main modules: Module A: Explosion resistance testing; Module B: Flame transmission testing; Module C: Functional testing. Explosion isolation flap valves shall in princ
40、iple be tested according to all three modules but where possible the modules can be combined. If a combination is chosen, 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
41、. 5.2.2 Module A: Explosion resistance testing Explosion resistance shall be confirmed by explosion testing according to the 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
42、 and the pipe connecting the valve may be of any type (gas or dust), provided the pressure generated is sufficient to subject the valve to the required pressure. The DIN EN 16447:2014-09EN 16447:2014 (E) 8 valve shall be held in fully open position and released at the moment of ignition and shall cl
43、ose due to the explosion; 2) Test assignment/records: As a minimum, the maximum pressure recorded at the location of the valve; 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 specifi
44、cations or specifications of other ways of connecting parts, and wall thickness) only the largest size needs to be tested; 4) 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 def
45、ormation is allowed for brittle material. The maximum pressure recorded at the location of the valve corrected according to EN 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
46、.3 Module B: Flame transmission testing The main objective of the flame transmission testing is to verify that the explosion isolation 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
47、 the maximum reduced explosion overpressure as indicated in the intended use and a lower one (see “3) number of tests”) and shall 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:
48、 The test arrangement shall be similar to the one shown in Figure 4. The size of the vessel shall reflect the intended use of 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
49、flame reaches the position of the valve. The test arrangement shall include a duct in case it is expected that ducting on the 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 DIN EN 16447:2014-09EN 16447:2014 (E) 9 specifies a straight duct (with a length of at least 5 times the diameter) on the explosion isolation flap valve side which is not ex
