EN ISO/IEC 80079-49:2024

Explosive atmospheres - Part 49: Flame arresters - Performance requirements, test methods and limits for use (ISO/IEC 80079-49:2024)

This document specifies the requirements for flame arresters that prevent flame transmission when explosive gas-air or vapour-air mixtures are present. It establishes uniform principles for the classification, basic construction and information for use, including the marking of flame arresters, and specifies test methods to verify the safety requirements and determine safe limits of use. This document is applicable to pressures ranging from 80 kPa to 160 kPa and temperatures ranging from -20 °C to +200 °C. This document does not apply to the following: - external safety-related measurement and control equipment that might be required to keep the operational conditions within the established safe limits; - flame arresters used for explosive mixtures of vapours and gases, which tend to self-decompose (for example, acetylene) or which are chemically unstable; - flame arresters used for carbon disulfide, due to its special properties; - flame arresters whose intended use is for mixtures other than gas-air or vapour-air mixtures (for example, higher oxygen-nitrogen ratio, chlorine as oxidant); - flame arrester test procedures for reciprocating internal combustion engines; - fast acting valves, extinguishing systems and other explosion isolating systems; - Flame arresters used in gas detectors (those being covered for example, by IEC 60079‑29‑1 and IEC 62990‑1). This edition cancels and replaces ISO 16852:2016, which has been technically revised. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to ISO 16852:2016: a) adaptation of the relevant IEC TC 31 requirements on standards; b) modification of the upper limit of the temperature range from 150 °C to 200 °C under the condition that T0 shall be not larger than 80 % of the auto ignition temperature of the gas-air-mixture; c) change of the term "explosion group" to "equipment group" due to editorial requirements in IEC/TC 31; d) clarification of the conditions and requirements for flame arresters whose intended operating conditions are outside the atmospheric conditions in 7.3.4 and 7.3.5; e) clarification of the requirements on the information for use in Clause 12 f) concerning the burn time; f) addition of a permission to the construction requirements both in 7.1 and 14.1 to substitute visual inspection by performing a flow test; g) addition of a flow chart for the evaluation of test results as Annex D

Explosive Atmosphären - Teil 49: Flammendurchschlagsicherungen - Leistungsanforderungen, Prüfverfahren und Einsatzgrenzen (ISO/IEC 80079-49:2024)

Dieses Dokument legt die Anforderungen an Flammendurchschlagsicherungen fest, die Flammen-durchschläge bei Vorhandensein von explosionsfähigen Gas-Luft- oder Dampf-Luft-Gemischen verhindern. Es stellt einheitliche Grundsätze für die Klassifizierung, die grundlegende Konstruktion und die Informationen für den Einsatz einschließlich der Kennzeichnung von Flammendurchschlagsicherungen auf und legt Prüfverfahren zur Überprüfung der sicherheitstechnischen Anforderungen und zur Bestimmung der sicheren Einsatzgrenzen fest.
Dieses Dokument gilt für Drücke von 80 kPa bis 160 kPa und für Temperaturen von −20 °C bis +200 °C.
ANMERKUNG 1   Für Flammendurchschlagsicherungen unter Betriebsbedingungen innerhalb des Anwendungsbereichs, aber außerhalb der atmosphärischen Bedingungen, siehe Anhang E.
ANMERKUNG 2   Dieses Dokument kann für Betriebsbedingungen, die von den oben festgelegten abweichen, als Leitlinie für die Auslegung und Prüfung von Flammendurchschlagsicherungen dienen. Dieses Dokument kann auch für die Auslegung zusätzlicher Prüfungen im Zusammenhang mit den spezifischen Einsatzbedingungen verwendet werden. Dies ist besonders bei hohen Temperaturen und Drücken wichtig. Die Prüfgemische müssten in diesen Fällen möglicherweise verändert werden.
Dieses Dokument gilt nicht für folgende Produkte:
-   externe sicherheitsrelevante Mess- und Überwachungseinrichtungen, die erforderlich sein könnten, um die Betriebsbedingungen innerhalb der festgelegten sicheren Grenzen zu halten;
ANMERKUNG 3   Eingebaute Mess- und Überwachungseinrichtungen, wie z. B. integrierte Temperatur- und Flammenmessfühler sowie Bauteile, bei denen es beispielsweise beabsichtigt ist, dass sie schmelzen (Rückhaltestift), wegbrennen (Wetterhauben) oder sich verformen (Bimetallstreifen), fallen in den Anwendungsbereich dieses Dokuments.
-   Flammendurchschlagsicherungen für explosionsfähige Gemische aus Dämpfen und Gasen, die zum Selbstzerfall neigen (z. B. Acetylen) oder die chemisch instabil sind;
-   Flammendurchschlagsicherungen, die bei Schwefelkohlenstoff eingesetzt werden, da dieser spezielle Eigenschaften besitzt;
-   Flammendurchschlagsicherungen, die bestimmungsgemäß für andere Gemische als Gas-Luft- oder Dampf-Luft-Gemische (z. B. höheres Verhältnis Sauerstoff-Stickstoff, Chlor als Oxidationsmittel) eingesetzt werden sollen;
-   Prüfverfahren für Flammendurchschlagsicherungen an Hubkolben-Verbrennungsmotoren;
ANMERKUNG 4   Flammendurchschlagsicherungen für spezielle Anwendungen (z. B. Hubkolben-Verbrennungsmotoren) können dieses Dokument als Leitfaden für die Auslegung verwenden, müssen jedoch entsprechend ihrer spezifischen Verwendung geprüft werden.
-   Schnellschlussventile, Löschsysteme und andere Explosionsentkoppelungssysteme;
-   Flammendurchschlagsicherungen, die in Gaswarngeräten verwendet werden (z. B. diejenigen nach IEC 60079 29 1 und IEC 62990 1).

Atmosphères explosives - Partie 49: Arrête flammes - Exigences de performance, méthodes d’essai et limites d’utilisation (ISO/IEC 80079-49:2024)

ISO/IEC 80079-49:2024 spécifie les exigences applicables aux arrête-flammes qui empêchent la transmission d’une flamme lorsqu’un mélange explosible gaz-air ou vapeur-air est présent. Il établit des principes homogènes pour la classification, la construction de base et les informations pour l’utilisation, y compris le marquage des arrête-flammes, et spécifie des méthodes d’essai permettant de vérifier les exigences de sécurité et de déterminer les limites de sécurité d’utilisation. Le présent document s’applique pour des pressions comprises entre 80 kPa et 160 kPa et des températures comprises entre –20 °C et +200 °C. Le présent document ne s’applique pas aux cas suivants: – appareils externes de contrôle et de mesure qui peuvent être exigés pour le maintien des conditions opérationnelles dans les limites de sécurité établies; – arrête-flammes utilisés pour des mélanges explosibles de vapeurs et de gaz qui ont tendance à s’autodécomposer (par exemple l’acétylène) ou qui sont chimiquement instables; – arrête-flammes utilisés pour le disulfure de carbone, du fait de ses propriétés spécifiques; – arrête-flammes destinés à être utilisés pour des mélanges autres que des mélanges gaz air ou vapeur-air (par exemple avec un rapport oxygène-azote plus élevé, avec présence de chlore en tant qu’oxydant); – procédures d’essai d’arrête-flammes pour moteurs à pistons à combustion interne; – vannes à fermeture rapide, barrières d’extinction ou autres systèmes d’isolation d’explosion; – arrête-flammes utilisés dans les détecteurs de gaz (ceux qui sont couverts, par exemple par l’IEC 60079‑29‑1 et l’IEC 62990‑1). Cette deuxième édition annule et remplace l’ISO 16852:2016, qui a fait l’objet d’une révision technique. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’ISO 16852:2016: a) adaptation des exigences pertinentes du CE 31 de l’IEC relatives aux normes; b) modification de la limite supérieure du domaine de températures de 150 °C à 200 °C à condition que T0 ne soit pas supérieure à 80 % de la température d’auto-inflammation du mélange air-gaz; c) modification du terme "groupe d’explosion" en "groupe d’appareils" en raison des exigences rédactionnelles du CE 31 de l’IEC; d) clarification des conditions et des exigences relatives aux arrête-flammes dont les conditions d’utilisation prévues sont en dehors des conditions atmosphériques en 7.3.4 et 7.3.5; e) clarification des exigences relatives aux instructions d’utilisation à l’Article 12, f), concernant le temps de brûlage; f) ajout d’une autorisation aux exigences de construction en 7.1 et 14.1 pour remplacer l’examen visuel par la réalisation d’un essai d’écoulement; g) ajout d’une Annexe D qui fournit un organigramme pour l’évaluation des résultats d’essai. La présente version bilingue (2024-12) correspond à la version anglaise monolingue publiée en 2024-05. La version française de cette norme n'a pas été soumise au vote

Eksplozivne atmosfere - 49. del: Plamenske zapore - Zahtevane lastnosti, preskusne metode in omejitve uporabe (ISO/IEC 80079-49:2024)

General Information

• Status: Published
• Publication Date: 08-Oct-2024
• ICS: 13.220.20 - Fire protection
• Technical Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Drafting Committee: CEN/TC 305 - Potentially explosive atmospheres - Explosion prevention and protection
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 09-Oct-2024
• Completion Date: 09-Oct-2024
• Directive: 2014/34/EU - Directive 2014/34/EU Of The European Parliament And Of The Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast)
• Mandate: M/596 - [C(2023)4798] Commission Implementing Decision of 20.7.2023 on a standardisation request as regards equipment and protective systems intended for use in potentially explosive atmospheres in support of Directive 2014/34/EU (ATEX) of the European Parliament and of the Council
• 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 ISO/IEC 80079-49:2024 - Explosive atmospheres - Part 49: Flame arresters - Performance requirements, test methods and limits for use (ISO/IEC 80079-49:2024)

Relations

• Replaces: EN ISO 16852:2016 - Flame arresters - Performance requirements, test methods and limits for use (ISO 16852:2016)
• Effective Date: 18-Jan-2023

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2024
Eksplozivne atmosfere - 49. del: Plamenske zapore - Zahtevane lastnosti,
preskusne metode in omejitve uporabe (ISO/IEC 80079-49:2024)
Explosive atmospheres - Part 49: Flame arresters - Performance requirements, test
methods and limits for use (ISO/IEC 80079-49:2024)
Explosive Atmosphären - Teil 49: Flammendurchschlagsicherungen -
Leistungsanforderungen, Prüfverfahren und Einsatzgrenzen (ISO/IEC 80079-49:2024)
Atmosphères explosives - Partie 49: Titre manque (ISO/IEC 80079-49:2024)
Ta slovenski standard je istoveten z: EN ISO/IEC 80079-49:2024
ICS:
13.220.20 Požarna zaščita Fire protection
13.230 Varstvo pred eksplozijo Explosion protection
29.260.20 Električni aparati za Electrical apparatus for
eksplozivna ozračja explosive atmospheres
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO/IEC 80079-49
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 13.220.20 Supersedes EN ISO 16852:2016
English Version
Explosive atmospheres - Part 49: Flame arresters -
Performance requirements, test methods and limits for
use (ISO/IEC 80079-49:2024)
Atmosphères explosives - Partie 49: Arrête flammes - Explosive Atmosphären - Teil 49:
Exigences de performance, méthodes d'essai et limites Flammendurchschlagsicherungen -
d'utilisation (ISO/IEC 80079-49:2024) Leistungsanforderungen, Prüfverfahren und
Einsatzgrenzen (ISO/IEC 80079-49:2024)
This European Standard was approved by CEN on 5 February 2024.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO/IEC 80079-49:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/34/EU aimed to be covered . 4
European foreword
This document (EN ISO/IEC 80079-49:2024) has been prepared by Technical Committee ISO/TMB
"Technical Management Board - groups" in collaboration with 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 April 2025, and conflicting national standards shall be
withdrawn at the latest by October 2025.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 16852:2016.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO/IEC 80079-49:2024 has been approved by CEN as EN ISO/IEC 80079-49:2024 without
any modification.
Annex ZA
(informative)
Relationship between this European Standard and the essential
requirements of Directive 2014/34/EU aimed to be covered
This European Standard has been prepared under a Commission’s standardization request M/596 to
provide one voluntary means of conforming to essential requirements of Directive 2014/34/EU of the
European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the
Member States relating to equipment and protective systems intended for use in potentially explosive
atmospheres (recast).
Once this standard is cited in the Official Journal of the European Union under that Directive,
compliance with the normative clauses of this standard given in Table ZA.1 confers, within the limits of
the scope of this standard, a presumption of conformity with the corresponding essential requirements
of that Directive, and associated EFTA regulations.
Table ZA.1 — Correspondence between this European Standard and Directive 2014/34/EU
Essential Requirements of Clause(s)/subclause(s) of this
Remarks/Notes
Directive 2014/34/EU EN
1.0.1 Principles of integrated Clause 5; 14.1; 14.2; 14.3;
explosion safety Annex E.1
1.0.2 Design and manufacture 7.1; 7.2; Clause 14; Annex C;
considerations Annex E.1
1.0.3 Special checking and Annex C; Clause 12
maintenance conditions
1.0.4 Surrounding area 14.1; Annex E.1
conditions
1.0.5 Marking Clause 13
1.0.6 Instructions Clause 12; Annex E
1.1.1 Operational stresses on 7.1; 14.1;Annex C; Annex E.1
material
1.1.2 Reaction of material 14.1;Annex C; Annex E.1
1.1.3 Wear of material 7.1; 14.1; Annex E.1
1.2.1 Design and construction 5.1; 14.1, Annex E.1; 14.2; 14.3;
for safe operation 14.4; 7.1
1.2.3 Enclosed structures and 14.5; 14.2
prevention of leaks
1.2.5 Additional means of Clause 12
protection
1.2.8 Overloading of equipment 7.3.4; 10.1; 11.1
Essential Requirements of Clause(s)/subclause(s) of this
Remarks/Notes
Directive 2014/34/EU EN
1.2.9 Flameproof enclosure 7.3; 14.2; 14.3
systems
1.3.1 Hazards arising from 14.1; Annex E.1
different ignition sources
1.3.2 Hazards arising from Annex B; Annex C
static electricity
1.4.1 External effects 14.1; Annex E.1
1.4.2 Mechanical, thermal and 14.1; Annex E.1
chemical stresses
1.6.4 Hazards arising from 14.3
connections
3.0.1 Dimensioning Clauses 6; 7; 8; 9; 10; 11
3.0.2 Design and position Clauses 6; 7; 8; 9; 10; 11
3.0.4 Outside interference 13.3
3.1.2 Shock waves 14.4; 7.3.3
Table ZA.2 — Applicable Standards to confer presumption of conformity as described in this
Annex ZA
Column 1 Column 2 Column 3 Column 4
Reference in International
Title Corresponding European
Clause 2 Standard Edition
Standard Edition
ISO/IEC 80079-34 ISO/IEC 80079- Explosive atmospheres – EN ISO/IEC 80079-34:2020
34:2020 Part 34: Application of
quality systems for ex
product manufacture
IEC 60079-0 IEC 60079-0:2017 Explosive atmospheres – EN IEC 60079-0:2018
Part 0: Equipment –
General requirements
IEC 60079-1 IEC 60079-1:2014 Explosive atmospheres –
EN 60079-1:2014
Part 1: Equipment
protection by flameproof
enclosures "d"
As impacted by EN IEC 60079-0:2018/AC:2020-02
As impacted by EN IEC 60079-1:2014/AC:2018-09
The documents listed in the Column 1 of Table ZA.2, in whole or in part, are normatively referenced in
this document, i.e. are indispensable for its application. The achievement of the presumption of
conformity is subject to the application of the edition of Standards as listed in Column 4 or, if no
European Standard Edition exists, the International Standard Edition given in Column 2 of Table ZA.2.
WARNING 1 — Presumption of conformity stays valid only as long as a reference to this European
Standard is maintained in the list published in the Official Journal of the European Union. Users of this
standard should consult frequently the latest list published in the Official Journal of the European
Union.
WARNING 2 — Other Union legislation may be applicable to the product(s) falling within the scope of
this standard.
ISO/IEC 80079-49
Edition 1.0 2024-05
INTERNATIONAL
STANDARD
Explosive atmospheres –
Part 49: Flame arresters – Performance requirements, test methods and limits

for use
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.220.10 ISBN 978-2-8322-8716-3

– 2 – ISO/IEC 80079-49:2024 © ISO/IEC 2024
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 Abbreviated terms and symbols . 13
5 Hazards and flame arrester classifications . 14
5.1 Flame transmission classification: deflagration, stable and unstable
detonation . 14
5.2 Flame transmission classification: stabilized burning . 15
5.3 Index of tests . 15
6 General requirements . 16
6.1 Measuring instruments . 16
6.2 Flow measurement (air) . 17
6.3 Flame transmission test . 17
6.3.1 General . 17
6.3.2 Test mixtures . 17
7 Specific requirements for static flame arresters . 19
7.1 Construction requirements for prototype arresters . 19
7.2 Design series . 19
7.3 Flame transmission tests . 20
7.3.1 General . 20
7.3.2 Deflagration test . 21
7.3.3 Tests for detonation flame arresters . 24
7.3.4 Short time burning test . 30
7.3.5 Endurance burning test . 33
8 Specific requirements for liquid product detonation flame arresters . 34
8.1 Liquid seals . 34
8.2 Foot valves . 35
8.3 Flame transmission test . 36
9 Specific requirements for dynamic flame arresters (high velocity vent valves) . 37
9.1 General . 37
9.2 Flame transmission test
...