EN 14522:2005

Determination of the auto ignition temperature of gases and vapours

This European Standard test method is designed to determine the auto ignition temperature of a flammable gas or vapour in mixture with air, or air/inert gas, at ambient pressure up to 650 °C. It is not suitable to describe the interactions of hot surfaces with explosives.

Bestimmung der Zündtemperatur von Gasen und Dämpfen

Dieses Normprüfverfahren ist dafür vorgesehen, die Mindestzündtemperatur eines brennbaren Gases oder Dampfs in Gemischen mit Luft oder Luft/Inertgas bei Umgebungsdruck bis zu einer Temperatur von 650 °C zu bestimmen. Es ist nicht geeignet, die Einwirkungen heißer Oberflächen auf Sprengstoffe zu beschreiben.

Détermination de la température d'auto-allumage des gaz et des vapeurs

La présente méthode d'essai normalisée est conçue pour déterminer la température minimale d'inflammation d'un gaz ou d'une vapeur inflammable, en mélange avec l'air, ou avec un mélange air/gaz inerte, pour une pression ambiante inférieure ou égale à 650 °C. Elle ne convient pas pour la caractérisation des interactions entre les surfaces chaudes et les explosifs.

Ugotavljanje temperature vžiga plinov in hlapov

General Information

• Status: Withdrawn
• Publication Date: 27-Sep-2005
• Withdrawal Date: 20-Apr-2021
• ICS: 13.230 - Explosion protection
• 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
• Completion Date: 21-Apr-2021
• 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)
• 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
• 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 14522:2006 - Determination of the auto ignition temperature of gases and vapours

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Determination of the auto ignition temperature of gases and vapoursUgotavljanje temperature vžiga plinov in hlapovDétermination de la température d'auto-allumage des gaz et des vapeursBestimmung der Zündtemperatur von Gasen und Dämpfen13.230Varstvo pred eksplozijoExplosion protectionICS:SIST EN 14522:2006enTa slovenski standard je istoveten z:EN 14522:200501-februar-2006SIST EN 14522:2006SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14522September 2005ICS 13.230 English VersionDetermination of the auto ignition temperature of gases andvapoursDétermination de la température d'auto-allumage des gazet des vapeursBestimmung der Zündtemperatur von Gasen und DämpfenThis 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 14522:2005: E

Verification.14 Annex B (informative)
Example of test apparatus assembly.15 Annex C (informative)
Illustration of parabolic fit procedure in method P.17 Annex D (normative)
Safety aspects.18 Annex E (informative)
Volume dependence of auto ignition temperature.19 Annex F (informative)
Example for a form expressing the results.20 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC.21 Bibliography.22 Figures Figure B.1 — Test apparatus assembly.15 Figure B.2 — Example of the support for the Erlenmeyer flask.16 Figure C.1 — Parabolic fit procedure.17 Figure E.1 — Volume dependence of auto ignition temperature.19 Tables Table A1 — Valuesa for Verification of the apparatus.14 Table ZA.1 — Correspondence between this European Standard and Directive 94/9/EC.21

IEC 60601-2-13 ‘Medical electrical equipment – Part 2-13: Particular requirements for the safety of anaesthetic systems’.

1 Scope This European Standard test method is designed to determine the auto ignition temperature of a flammable gas or vapour in mixture with air, or air/inert gas, at ambient pressure up to 650 °C. It is not suitable to describe the interactions of hot surfaces with explosives. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including amendments) applies. ISO 1773, Laboratory glassware — Narrow-necked boiling flasks 3 Terms and definitions For the purposes of this European Standard, the following terms and definitions apply. 3.1 auto ignition temperature Ti lowest temperature (of a hot surface) at which under specified test conditions an ignition of a flammable gas or flammable vapour in mixture with air or air/inert gas occurs 3.2 ignition delay time time between the completed injection of the flammable substance and the ignition NOTE 1 The ignition delay time may vary between fractions of a second and some minutes. NOTE 2 In literature auto ignition temperature is also referred to as self ignition temperature. In the case of dusts the respective safety characteristic is referred to as minimum ignition temperature. 4 Test method 4.1 Principle The amount of substance and the temperature of the test vessel, which is filled with air or air/inert gas, are varied to find the lowest temperature (of the hot surface) that causes an ignition. 4.2 Apparatus 4.2.1 General The test apparatus consists of:  a test vessel;  support for the test vessel;  calibrated measuring thermocouple;

1) when the oven is covered with a well fitting lid and after having reached the respective temperature equilibrium  the temperature at the position of the measuring thermocouple and the temperature at the position of the centre of the bottom of the Erlenmeyer flask differ not more than 3 K over the whole temperature range and  the temperature measured at the position of the measuring thermocouple and the temperature measured at the position half of the height of the Erlenmeyer flask differ not more than 15 K over the whole temperature range; 2) when the oven is equipped with the Erlenmeyer flask filled with air  the temperature measured with the measuring thermocouple varies not more than 2 K over a period of 6 min over the whole temperature range. Care shall be taken that there is no direct contact between the test vessel and the inner walls of the oven. The distance between the inner walls and the Erlenmeyer flask shall be at least 4 mm. The test vessel shall be mounted in such a way that  it is totally immersed in the oven, whereas the oven should not overlap the Erlenmeyer flask more than 30 mm;  it is uniformly heated;  the mixture of air and flammable substance which is generated inside the Erlenmeyer flask by introducing the sample is not affected by the convection inside the oven;  there is no possibility that the (explosive) mixture of air and flammable substance which is generated inside the Erlenmeyer flask by introducing the sample enters into the oven and

The metering device (e.g. flow meter, pump, syringe) shall be designed in such a way that it is possible to meter the gas with an accuracy of 10 % at a rate of (25 ± 5) ml/s. A filling tube that can be introduced into the test vessel shall be connected (movably) to the metering device.  Liquids The metering device (e.g. pump, pipette, syringe) shall be designed in such a way that it is possible to meter droplets having a volume of (25 ± 10) µl. 4.2.5 Mirror A mirror of sufficient dimensions shall be positioned in such a way that it allows to observe the ignition of the flammable gas/air mixture (e.g. a distance of about 25 cm above the opening of the test vessel). 4.2.6 Timer A timer calibrated in one-second intervals shall be used to determine the ignition delay time. 4.2.7 Equipment for cleaning the test
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