EN 13673-2:2005

Determination of maximum explosion pressure and the maximum rate of pressure rise of gases and vapours - Part 2: Determination of the maximum rate of explosion pressure rise

The standard test method is designed to produce measurements of the rate of explosion pressure rise and the maximum rate of explosion pressure rise of a flammable gas/air/inert mixture in a closed volume at ambient temperature and pressure. In this European Standard, the term "gas" includes vapours but not mists. Detonation and decomposition phenomena are not considered in this European Standard.
The rates of pressure rise measured by the procedures specified in this European Standard are not applicable to flameproof enclosures, that is enclosures intended to withstand an internal explosion and not to transmit it to an external explosive atmosphere, or any other closed volume where the internal geometry can result in pressure piling.  Even in an enclosure of relatively simple geometry the disposition of the internal components can lead to rates of pressure rise significantly higher than those measured using this European Standard. Flameproof enclosures shall be constructed and tested in accordance with the requirements contained in EN 60079-1 for electrical equipment and EN 13463-3 for non-electrical equipment.

Verfahren zur Bestimmung des maximalen Explosionsdruckes und des maximalen zeitlichen Druckanstieges für Gase und Dämpfe - Teil 2: Bestimmungsverfahren für den maximalen zeitlichen Druckanstieg

Diese Europäische Norm legt ein Verfahren fest zum Bestimmen des zeitlichen Druckanstieges und des maximalen zeitlichen Druckanstieges von Gemischen aus brennbaren Gasen, Luft und Inertgas in einem geschlossenen Behälter bei Umgebungsbedingungen. In dieser Europäischen Norm schließt ”Gas” auch Dämpfe ein, jedoch nicht Nebel. Dieses Dokument gilt nicht für Bedingungen, unter denen Detonations- bzw. Zersetzungsphänomene auftreten können.
Die nach den in dieser Europäische Norm festgelegten Verfahren ermittelten zeitlichen Druckanstiege können nicht Grundlage für die Schutzart druckfeste Kapselung sein. Druckfeste Kapselung ist ausgelegt, Explosionen im Inneren von Betriebsmitteln standzuhalten und so den Zünddurchschlag zu verhindern in äußere explosionsfähige Atmosphäre oder in ein umschlossenes Volumen, dessen Einbauten zu Drucksteigerung führen können. Selbst in relativ einfachen Geometrien können Einbauten zu deutlich höheren als nach dieser Europäische Norm bestimmten zeitlichen Druckanstiegen führen. Druckfeste Kapselung für elektrische Betriebsmittel muss nach EN 60079-1 und für nicht-elektrische Betriebsmittel nach EN 13463-3 ausgelegt und geprüft sein.

Détermination de la pression maximale d'explosion et de la vitesse maximale de montée en pression des gaz et des vapeurs - Partie 2: Détermination de la vitesse maximale de montée en pression

La méthode d'essai normalisée est conçue pour fournir des mesures de la vitesse de montée en pression et
de la vitesse maximale de montée en pression d'un mélange combustible/air/gaz inerte, dans un volume clos,
à température et pression ambiantes. Les phénomènes d�explosion et de décomposition ne sont pas pris en
compte dans la présente Norme européenne.
Les vitesses de montée en pression mesurées selon les modes opératoires spécifiés dans la présente norme
ne sont pas applicables aux enveloppes antidéflagrantes, c�est-à-dire aux enveloppes destinées à résister à
une explosion interne et à ne pas la transmettre à l�atmosphère explosive externe ou à tout autre volume
fermé où la géométrie interne peut entraîner une accumulation de pression. Même dans une enveloppe dont
la géométrie est relativement simple, la disposition des éléments internes peut conduire à des vitesses de
montée en pression nettement supérieures à celles mesurées selon le présente document. Les enveloppes
antidéflagrantes doivent être construites et soumises à essai conformément aux exigences de l�EN 60079-1
pour le matériel électrique et à l�EN 13463-3 pour le matériel non électrique.

Ugotavljanje najvišjega tlaka eksplozije in največje hitrosti naraščanja tlaka plinov in hlapov - 2. del: Ugotavljanje največje hitrosti naraščanja tlaka eksplozije

General Information

• Status: Withdrawn
• Publication Date: 27-Sep-2005
• Withdrawal Date: 02-Aug-2011
• ICS: 13.230 - Explosion protection
• ICS: 75.160.30 - Gaseous fuels
• Technical Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Drafting Committee: CEN/TC 305/WG 1 - Test methods for determining the flammability characteristics of substances (provisional title)
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 03-Aug-2011
• Completion Date: 03-Aug-2011
• Directive: 94/9/EC - Directive 94/9/EC of the European Parliament and the Council of 23 March 1994 on the approximation of the laws of the Member States concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Directive: 98/37/EC - Machinery
• Mandate: M/079 - Mandate to CEN and CENELEC for standardization in the field of machines
• Mandate: M/BC/CEN/92/46 - Standardization mandate assigned to CEN/CENELEC concerning equipment and protective systems intended for use in potentially explosive atmospheres
• Ref Project: SIST EN 13673-2:2006 - Determination of maximum explosion pressure and the maximum rate of pressure rise of gases and vapours - Part 2: Determination of the maximum rate of explosion pressure rise

Relations

• Replaced By: EN 15967:2011 - Determination of maximum explosion pressure and the maximum rate of pressure rise of gases and vapours
• Effective Date: 06-Aug-2011

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Verfahren zur Bestimmung des maximalen Explosionsdruckes und des maximalen zeitlichen Druckanstieges für Gase und Dämpfe - Teil 2: Bestimmungsverfahren für den maximalen zeitlichen DruckanstiegDétermination de la pression maximale d'explosion et de la vitesse maximale de montée en pression des gaz et des vapeurs - Partie 2: Détermination de la vitesse maximale de montée en pressionDetermination of maximum explosion pressure and the maximum rate of pressure rise of gases and vapours - Part 2: Determination of the maximum rate of explosion pressure rise13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 13673-2:2005SIST EN 13673-2:2006en,fr,de01-februar-2006SIST EN 13673-2:2006SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13673-2September 2005ICS 13.230; 75.160.30 English VersionDetermination of maximum explosion pressure and themaximum rate of pressure rise of gases and vapours - Part 2:Determination of the maximum rate of explosion pressure riseDétermination de la pression maximale d'explosion et de lavitesse maximale de montée en pression des gaz et desvapeurs - Partie 2: Détermination de la vitesse maximalede montée en pressionVerfahren zur Bestimmung des maximalenExplosionsdruckes und des maximalen zeitlichenDruckanstieges für Gase und Dämpfe - Teil 2:Bestimmungsverfahren für den maximalen zeitlichenDruckanstiegThis European Standard was approved by CEN on 1 August 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 nationalstandards 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 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, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13673-2:2005: ESIST EN 13673-2:2006

Verification.15 Annex B (normative)
Smoothing of pressure-time curves.18 Annex C (informative)
Conversion of the values for the flammable substance content.22 Annex D (informative)
Example of an evaporator equipment for liquid flammable substances.26 Annex E (informative)
Example of a test report.27 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directives 94/9/EC and 98/37/EC.29 Bibliography.30 Figures Figure A.A1 — Plot of the rate of explosion pressure rise (dp/dt)ex as a function of the test vessel volume V for H2-air mixtures (xH2 ≅ 35 mol %).16 Figure A.A2 — Plot of the rate of explosion pressure rise (dp/dt)ex as a function of the test vessel volume V for CH4-air mixtures (xCH4 ≅ 10 mol %).16 Figure A.A3 — Plot of the rate of explosion pressure rise (dp/dt)ex as a function of the test vessel volume V for NH3-air mixtures (xNH3 ≅ 23 mol %).17 Figure B.B1 — Example of a raw p(t) curve showing oscillations.19 Figure B.B2 — Example of a raw p(t) curve showing oscillations.20 Figure B.B3 — Schematic diagram showing the variation of (dp/dt)ex as a function of a smoothing parameter.21 Figure D.D1 — Evaporator equipment for producting test mixtures from liquid flammable substances.26 Tables Table 1 — Rules for rounding up (dp/dt)ex and (dp/dt)max values.13 SIST EN 13673-2:2006

1 Scope The standard test method is designed to produce measurements of the rate of explosion pressure rise and the maximum rate of explosion pressure rise of a flammable gas/air/inert mixture in a closed volume at ambient temperature and pressure. In this European Standard, the term "gas" includes vapours but not mists. Detonation and decomposition phenomena are not considered in this European Standard. The rates of pressure rise measured by the procedures specified in this European Standard are not applicable to flameproof enclosures, that is enclosures intended to withstand an internal explosion and not to transmit it to an external explosive atmosphere, or any other closed volume where the internal geometry can result in pressure piling.
Even in an enclosure of relatively simple geometry the disposition of the internal components can lead to rates of pressure rise significantly higher than those measured using this European Standard. Flameproof enclosures shall be constructed and tested in accordance with the requirements contained in EN 60079-1 for electrical equipment and EN 13463-3 for non-electrical equipment. 2 Normative references Not applicable. 3 Terms and definitions For the purpose of this European Standard, the following terms and definitions apply. 3.1 rate of explosion pressure rise (dp/dt)ex highest value of the slope (first derivative) of the pressure-time curve (smoothed if necessary), measured in a closed vessel during the explosion of a specific mixture of flammable gases with air or air and inert gases determined under specified test conditions 3.2 maximum rate of explosion pressure rise (dp/dt)max maximum value of the rate of explosion pressure rise, when varying the content of flammable gas in the mixture NOTE For the purpose of this document, all pressures are expressed in bar absolute and rate of explosion pressure rises are expressed in bar/s. 4 Test method 4.1 Principle An explosive test mixture is ignited by a defined ignition source which is positioned in the centre of the test vessel. By means of a pressure measuring system, the pressure-time curve developed following ignition of the test mixture is recorded and the highest rate of explosion pressure rise (dp/dt)ex is calculated. The maximum rate of explosion pressure rise (dp/dt)max is determined from measurements of the highest rate of explosion pressure rise (dp/dt)max by varying stepwise the content of flammable gas in the mixture, until the maximum (dp/dt)ex is found. SIST EN 13673-2:2006
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