EN 17624:2022
(Main)Determination of explosion limits of gases and vapours at elevated pressures, elevated temperatures or with oxidizers other than air
Determination of explosion limits of gases and vapours at elevated pressures, elevated temperatures or with oxidizers other than air
This document specifies a test method to determine the explosion limits of gases, vapours and their mixtures, mixed with a gaseous oxidizer or an oxidizer/inert gas mixture at pressures from 0,10 MPa to 10 MPa and for temperatures up to 400 °C.
Bestimmung der Explosionsgrenzen von Gasen und Dämpfen bei erhöhten Drücken, erhöhten Temperaturen oder mit Oxidationsmitteln, welche nicht aus Luft bestehen
Dieses Dokument legt ein Prüfverfahren zur Bestimmung der Explosionsgrenzen von Gasen, Dämpfen und deren Gemischen, gemischt mit einem gasförmigen Oxidator oder einem Oxidator-Inertgas-Gemisch, bei Drücken von 0,10 MPa bis 10 MPa und für Temperaturen bis 400 °C fest.
Détermination des limites d'explosivité des gaz et vapeurs à pressions et températures élevées avec des oxydants autres que l’air
Le présent document spécifie une méthode d'essai pour déterminer les limites d'explosivité de gaz, de vapeurs et de leurs mélanges, associés à un oxydant gazeux ou à un mélange oxydant/gaz inerte, à des pressions comprises entre 0,10 MPa et 10 MPa et à des températures pouvant atteindre 400 °C.
Določanje eksplozijskih mej plinov in hlapov pri povišanem tlaku, povišani temperaturi ali z oksidanti, ki niso sestavljeni iz zraka
Ta dokument določa preskusno metodo za določanje eksplozijskih mejnih vrednosti plinov, hlapov in njihovih mešanic, pomešanih s plinastim oksidantom ali mešanico oksidanta in inertnega plina, pri tlakih od 1 bara do 100 barov in temperaturah do 400 °C.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2022
Določanje eksplozijskih mej plinov in hlapov pri povišanem tlaku, povišani
temperaturi ali z oksidanti, ki niso sestavljeni iz zraka
Determination of explosion limits of gases and vapours at elevated pressures, elevated
temperatures or with oxidizers other than air
Bestimmung der Explosionsgrenzen von Gasen und Dämpfen bei erhöhten Drücken,
erhöhten Temperaturen oder mit Oxidationsmitteln, welche nicht aus Luft bestehen
Détermination des limites d'explosivité des gaz et vapeurs à pressions et températures
élevées avec des oxydants autres que l’air
Ta slovenski standard je istoveten z: EN 17624:2022
ICS:
13.230 Varstvo pred eksplozijo Explosion protection
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EN 17624
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2022
EUROPÄISCHE NORM
ICS 13.230
English Version
Determination of explosion limits of gases and vapours at
elevated pressures, elevated temperatures or with
oxidizers other than air
Détermination des limites d'explosivité des gaz et Bestimmung der Explosionsgrenzen von Gasen und
vapeurs à pressions et températures élevées avec des Dämpfen bei erhöhten Drücken, erhöhten
oxydants autres que l'air Temperaturen oder mit Oxidationsmitteln, welche
nicht aus Luft bestehen
This European Standard was approved by CEN on 7 February 2022.
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, Turkey 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17624:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Test methods . 7
4.1 General. 7
4.2 Reagents and materials . 7
4.2.1 Sample . 7
4.2.2 Oxidizer . 7
4.2.3 Inert gases . 7
4.2.4 Gaskets and mountings . 8
4.3 Apparatus . 8
4.3.1 Test vessel . 8
4.3.2 Measurement system to adjust the initial pressure and temperature . 8
4.3.3 Ignition source . 9
4.3.4 Equipment for preparing the test mixture . 11
4.3.5 Temperature regulating system . 12
4.3.6 Safety equipment . 12
4.4 Preparation of the test mixture . 12
4.4.1 General. 12
4.4.2 Preparation of the test mixture . 12
4.5 Procedure . 13
4.6 Recording of results . 14
5 Verification . 14
6 Test report . 14
Annex A (informative) Safety measures . 15
Annex B (normative) Verification . 16
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive2006/42/EC aimed to be covered . 18
Bibliography . 19
European foreword
This document (EN 17624:2022) 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 September 2022, and conflicting national standards shall
be withdrawn at the latest by September 2022.
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 has been prepared under a Standardization Request 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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Turkey and the United
Kingdom.
Introduction
In accordance with EN ISO 12100:2010, this is a type-B standard.
The hazard of an explosion can be avoided by preventing the formation of explosive mixtures of gases
and/or vapours with oxidizers. To do so, the explosion limits (also known as “flammability limits”) of the
flammable substance need to be known. These limits are a strong function of the pressure and
temperature within the system.
Standard EN 1839:2017 has methods suitable for determining these limits at atmospheric conditions.
Technical conditions in plants, etc. can differ substantially from these assumed atmospheric conditions.
Furthermore, explosive mixtures of flammable substances and oxidizers other than air are likely to occur.
To obtain reliable and comparable results it is necessary to standardize the conditions for determining
the explosion limits at non-atmospheric conditions.
1 Scope
This document specifies a test method to determine the explosion limits of gases, vapours and their
mixtures, mixed with a gaseous oxidizer or an oxidizer/inert gas mixture at pressures from 0,10 MPa to
10 MPa and for temperatures up to 400 °C.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN ISO 10156:2017, Gas cylinders - Gases and gas mixtures - Determination of fire potential and oxidizing
ability for the selection of cylinder valve outlets (ISO 10156:2017)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
flammable substance
substance in the form of gas, vapour or mixtures of these, able to undergo an explosive exothermic
reaction with an oxidizer or an oxidizer/inert gas mixture when ignited
[SOURCE: EN 13237:2012, 3.37, modified: removed reference to liquids and solids as they are not
relevant for this standard]
3.2
explosion range
range of the concentration of a flammable substance or mixture of substances with an oxidizer, within
which an explosion can occur, respectively range of the concentration of a flammable substance or
mixture of substances in mixture with oxidizer/inert gas, within which an explosion can occur,
determined under specified test conditions
Note 1 to entry: The explosion limits are not part of the explosion range.
[SOURCE: EN 13237:2012, 3.22, modified: changed air to oxidizer]
3.3
lower explosion limit
LEL
lowest concentration of the explosion range
Note 1 to entry: Those concentrations are given at which an explosion just fails during the tests.
[SOURCE: EN 13237:2012, 3.19.1, modified: removed “at which an explosion can occur”]
3.4
upper explosion limit
UEL
highest concentration of the explosion range
Note 1 to entry: Those concentrations are given at which an explosion just fails during the tests.
[SOURCE: EN 13237:2012, 3.19.2, modified: removed “at which an explosion can occur”]
3.5
inert gas
gas that does not react with the test substance or oxidizer
3.6
explosion criterion
either an explosion pressure p relative to the initial pressure (p ) as follows (considering the
ex i
overpressure that is created by the ignition source alone (p )):
IS
p /p ≥ (1,05 + p /p − 1) (for initial pressures p ≤ 2)
ex i IS i i
p /p ≥ (1,02 + p /p − 1) (for initial pressures p > 2)
ex i IS i i
or a temperature rise (ΔT) of at least 100 K
3.7
oxidizer
any oxidising gas except highly reactive oxidisers with oxidizing potentials according to
EN ISO 10156:2017 higher than oxygen, e.g. ozone, fluorine, fluorinated compounds, etc.
3.8
sample
substance or mixture of substances for which explosion limits are to be determined
3.9
test substance
sample in the gaseous state; in the case of liquid samples, after complete evaporation
3.10
test mixture
mixture of test substance and oxidizer or oxidizer/inert gas
3.11
mole fraction
x(S)
mole fraction given in percent
4 Test methods
4.1 General
The determination consists of a series of ignition tests which are carried out with test mixtures varying
the test substance content.
The quiescent test mixture in the closed vessel is subjected to an ignition source. The overpressure and
the temperature rise as a result of the ignition is measured and characterizes the explosivity of the test
mixture. The amount of test substance in the test mixture is varied incrementally until the LEL or the UEL
is determined, or until it is ascertained that there is no explosion range.
When it is established that a given test mixture will not ignite, it is reco
...
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