Explosion isolation flap valves

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 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 stop 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 the use of explosion isolation flap valves that are intended for avoiding explosion propagation from a vessel, 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   The standard assumes that the explosion starts in a vessel and not in 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 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.

Rückschlagklappen zur explosionstechnischen Entkopplung

Diese Europäische Norm beschreibt die allgemeinen Anforderungen an Rückschlagklappen, die zur Ent¬kopplung im Falle einer Staubexplosion verwendet werden. Bei einer Rückschlagklappe zur explosionstech¬nischen Entkopplung handelt es sich um ein Schutzsystem, das verhindert, dass sich eine Staubexplosion über Verbindungsrohre oder  kanäle in andere Teile der Apparatur oder Anlagenbereiche ausbreitet.
Eine Rückschlagklappe zur explosionstechnischen Entkopplung kann die Ausbreitung einer Staubexplosion nur dann stoppen, wenn diese in Gegenrichtung zum üblichen Prozessstrom erfolgt. Sie verhindert nicht die Ausbreitung von Explosionen in Richtung des üblichen Prozessstroms. Diese Europäische Norm legt Verfahren für die Bewertung der Wirksamkeit von Rückschlagklappen zur explosionstechnischen Entkopplung fest.
Diese Europäische Norm gilt nur für Rückschlagklappen zur explosionstechnischen Entkopplung, die zur Vermeidung der Ausbreitung von Explosionen aus einem Behälter über Verbindungs¬rohre oder  leitungen in andere Teile der Anlage bestimmt sind. Diese Norm deckt die Trennung bzw. Entkopplung von Behältern ab, die durch Druckentlastung (einschließlich flammenloser Druckentlastung), Explosionsunterdrückung oder explosionsfeste Ausführung geschützt werden.
ANMERKUNG 1   Diese Norm ist nur auf Fälle anwendbar, bei denen die Explosion ihren Ausgang in einem Behälter und nicht in Rohren oder Rohrleitungen nimmt.
Rückschlagklappen zur explosionstechnischen Entkopplung sind nicht dafür vorgesehen, die Übertragung von Bränden oder brennendem Staub durch den regulären Prozessstrom zu verhindern.
ANMERKUNG 2   Dies muss bei Risikobeurteilungen berücksichtigt werden.
Diese Europäische Norm gilt nur für Staubexplosionen.
Diese Europäische Norm gilt nicht für Explosionen der nachfolgend aufgelisteten Stoffe oder von Gemischen, die derartige Stoffe enthalten:
a)   Gase, Dämpfe und hybride Gemische;
b)   chemisch instabile Stoffe;
c)   Explosivstoffe;
d)   pyrotechnische Materialien.

Vanne à clapet d'isolation d'explosion

La présente Norme européenne décrit les exigences générales pour les vannes à clapet d'isolation d'explosion de poussières. Une vanne à clapet d'isolation d'explosion est un système de protection qui empêche une explosion de poussières de se propager par la tuyauterie ou les canalisations dans d'autres parties d'un appareil ou d'une installation.
Une vanne à clapet d'isolation d'explosion peut arrêter la propagation d'une explosion de poussières uniquement lorsque ladite explosion se propage dans la direction opposée à celle du flux de fonctionnement normal. La vanne n'entrave pas les explosions qui se propagent dans la direction normale du flux de fonctionnement. La présente Norme européenne définit les méthodes d'évaluation de l'efficacité des vannes à clapet d'isolation d'explosion.
La présente Norme européenne s'applique uniquement aux vannes à clapet d'isolation d'explosion destinées à éviter la propagation d'une explosion survenant dans une enceinte vers d'autres parties de l'installation par la tuyauterie ou les conduits. La présente norme couvre l'isolation des enceintes protégées par décharge d'explosion (y compris la décharge d'explosion sans flamme), par suppression d'explosion ou par leur conception qui leur permet de résister aux explosions.
NOTE 1   La présente norme s’applique uniquement dans les cas où l'explosion se produit à l'intérieur d'une enceinte et non d'un conduit.
Les vannes à clapet d'isolation d'explosion ne sont conçues pour empêcher ni la propagation du feu ni la transmission des particules en combustion par le flux de fonctionnement normal.
NOTE 2   Il est nécessaire de prendre en compte cet aspect lors de l'évaluation des risques.
La présente Norme européenne s'applique uniquement aux explosions de poussières.
Elle n'est applicable ni aux explosions des substances indiquées ci-dessous, ni aux explosions de mélanges contenant certaines de ces substances :
a)   gaz, vapeurs et mélanges hybrides ;
b)   substances chimiquement instables ;
c)   substances explosives ;
d)   substances pyrotechniques.

Eksplozijsko izolacijski ventili

Standard EN 16447 opisuje splošne zahteve za ventile, ki se uporabljajo za izoliranje eksplozije prahu. Eksplozijsko izolacijski ventil je zaščitni sistem, ki preprečuje širjenje eksplozije prahu prek priključenih cevi ali cevovoda v druge dele stroja ali obrata. Eksplozijsko izolacijski ventil lahko širjenje eksplozije prahu prepreči le, če se ta širi v smeri, ki je nasprotna smeri običajnega poteka procesa, in ne prepreči eksplozij, ki se širijo v smeri običajnega poteka procesa. Ta evropski standard določa metode za vrednotenje učinkovitosti eksplozijsko izolacijskih ventilov. Ta evropski standard se uporablja le za eksplozijsko izolacijske ventile, namenjene preprečevanju širjenja eksplozije prek priključenih cevi ali cevovoda iz posode v druge dele instalacije. Standard zajema izolacijo tovrstnih posod, ki so zaščitene s sistemom za razbremenitev tlaka eksplozije (vključno z neplamenskim sistemom za razbremenitev tlaka eksplozije), dušenjem eksplozije ali konstrukcijo, odporno proti eksplozijam.

General Information

Status
Published
Publication Date
08-Jul-2014
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
08-Dec-2014

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Eksplozijsko izolacijski ventiliRückschlagklappen zur explosionstechnischen EntkopplungClapet d'isolation d'explosionExplosion isolation flap valves23.060.50Blokirni ventiliCheck valves13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 16447:2014SIST EN 16447:2014en01-oktober-2014SIST EN 16447:2014SLOVENSKI

STANDARD
SIST EN 16447:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 16447
July 2014 ICS 13.230; 23.060.50 English Version
Explosion isolation flap valves
Vanne à clapet d'isolation d'explosion

Rückschlagklappen 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 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 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 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 and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR 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 ESIST EN 16447:2014

EN 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 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 the Essential Requirements of EU Directive 94/9/EC ............................................................................................. 15 Bibliography ..................................................................................................................................................... 16

SIST EN 16447:2014

EN 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 which 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 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. 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), 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, 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 and the United Kingdom. SIST EN 16447:2014

EN 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 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 stop 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 vessel, 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 the 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 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 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 amendments) 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 SIST EN 16447:2014

EN 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 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 explosion 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

b) Key 1 fan 2 explosion isolation flap valve 3 vessel Figure 1 — Push flow situation SIST EN 16447:2014

EN 16447:2014 (E) 6 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 prevents 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 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 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 flap 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-resistant 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 mechanical integrity 5.1 General The testing shall reflect the intended use. As a minimum the following information is necessary prior to testing: SIST EN 16447:2014

EN 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 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 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, corrosive, 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) explosion 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 principle 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. 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 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 SIST EN 16447:2014

EN 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; 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) 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 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 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 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:

• 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 KSt as 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 t

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