EN 14034-4:2004

Determination of explosion characteristics of dust clouds - Part 4: Determination of the limiting oxygen concentration LOC of dust clouds

This document describes a test method for the determination of the limiting oxygen concentration of dust clouds in a closed vessel under defined initial conditions of pressure and temperature.
This method is not suitable for use with recognised explosives, like gunpowder and dynamite, substances which do not require oxygen for combustion, pyrophoric substances, or substances or mixtures of substances which may under some circumstances behave in a similar manner. Where any doubt exists about the existence of hazard due to explosive properties, expert advice should be sought.

Bestimmung der Explosionskenngrößen von Staub/Luft-Gemischen - Teil 4: Bestimmung der Sauerstoffgrenzkonzentration SGK von Staub/Luft-Gemischen

Dieses Dokument beschreibt ein Prüfverfahren für die Bestimmung der Sauerstoffgrenzkonzentration von Staubwolken in einem geschlossenen Behälter unter definierten Anfangsbedingungen von Druck und Temperatur.
Dieses Verfahren ist nicht geeignet für Sprengstoffe wie Schießpulver und Dynamit sowie Stoffe, die ohne Sauerstoff verbrennen, pyrophore Stoffe oder Stoffe bzw. Stoffgemische, die sich unter bestimmten Umständen ähnlich verhalten. Wenn Zweifel über eventuell vorhandene Gefährdungen durch die Explosionswirkung bestehen, sollten Fachleute zu Rate gezogen werden.

Détermination des caractéristiques d'explosion des nuages de poussières - Partie 4 : Détermination de la concentration limite en oxygène CLO des nuages de poussière

La présente norme décrit une méthode d'essai permettant de déterminer la concentration limite en oxygène des nuages de poussière dans un récipient fermé, dans des conditions initiales définies de pression et de température.
Cette méthode ne convient pas aux explosifs reconnus, tels que la poudre, la dynamite, les explosifs dont la combustion ne nécessite pas d'oxygène, les substances pyrophoriques ou les substances ou mélanges de substances susceptibles de se comporter de manière similaire dans certaines conditions. Il convient de demander l'avis d'un expert lorsqu'un doute subsiste en ce qui concerne l'existence d'un phénomène dangereux dû aux propriétés explosives.

Ugotavljanje eksplozijskih značilnosti oblakov prahu - 4. del: Ugotavljanje mejne koncentracije kisika LOC oblakov prahu

General Information

• Status: Withdrawn
• Publication Date: 07-Sep-2004
• Withdrawal Date: 11-Jan-2011
• 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
• Start Date: 12-Jan-2011
• Completion Date: 12-Jan-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
• 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 14034-4:2005 - Determination of explosion characteristics of dust clouds - Part 4: Determination of the limiting oxygen concentration LOC of dust clouds

Relations

• Merged Into: EN 14034-4:2004+A1:2011 - Determination of explosion characteristics of dust clouds - Part 4: Determination of the limiting oxygen concentration LOC of dust clouds
• Effective Date: 19-Jan-2023

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Determination of explosion characteristics of dust clouds - Part 4: Determination of the limiting oxygen concentration LOC of dust cloudsDétermination des caractéristiques d'explosion des nuages de poussieres - Partie 4 : Détermination de la concentration limite en oxygene CLO des nuages de poussiereBestimmung der Explosionskenngrößen von Staub/Luft-Gemischen - Teil 4: Bestimmung der Sauerstoffgrenzkonzentration SGK von Staub/Luft-Gemischen13.230Varstvo pred eksplozijoExplosion protectionICS:SIST EN 14034-4:2005enTa slovenski standard je istoveten z:EN 14034-4:200401-marec-2005SIST EN 14034-4:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14034-4September 2004ICS 13.230 English versionDetermination of explosion characteristics of dust clouds - Part4: Determination of the limiting oxygen concentration LOC ofdust cloudsDétermination des caractéristiques d'explosion des nuagesde poussières - Partie 4 : Détermination de la concentrationlimite en oxygène CLO des nuages de poussièresBestimmung der Explosionskenngrößen von Staub/Luft-Gemischen - Teil 4: Bestimmung derSauerstoffgrenzkonzentration SGK von Staub/Luft-GemischenThis European Standard was approved by CEN on 9 July 2004.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© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14034-4:2004: E

Electro pneumatic valve.16 Annex B (normative)
Dust disperser with 5 mm holes.19 Annex C (normative)
20 l sphere.22 C.1 General.22 C.2 Test apparatus.22 C.3 Test conditions.23 C.4 System to create the inert gas/air-mixture.24 C.5 Test procedure.24 Annex D (informative)
Examples of procedures to determine the LOC.25 Annex ZA (informative)
Relationship between this European Standard and the Essential Requirements of EU Directive 94/9.27 Bibliography.28

Annex II, Clause 1.0.1
1 Scope This document describes a test method for the determination of the limiting oxygen concentration of dust clouds in a closed vessel under defined initial conditions of pressure and temperature.
This method is not suitable for use with recognised explosives, like gunpowder and dynamite, substances which do not require oxygen for combustion, pyrophoric substances, or substances or mixtures of substances which may under some circumstances behave in a similar manner. Where any doubt exists about the existence of hazard due to explosive properties, expert advice should be sought. 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 any amendments) applies.
EN 14034-1:2004; Determination of explosion characteristics of dust clouds - Part 1: Determination of the maximum explosion pressure pmax of dust clouds. prEN 14034-2:2004; Determination of explosion characteristics of dust clouds - Part 2: Determination of the minimum rate of explosion pressure rise (dp/dt) max of dust clouds. prEN 14460, Explosion resistant equipment. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 dust small solid particles in the atmosphere which settle out under their own weight, but which may remain suspended in air for some time (includes dust and grit, as defined in ISO 4225). NOTE Generally maximum particle size will not exceed 500 µm. 3.2 combustible dust dust able to undergo an exothermic reaction with air when ignited NOTE The terms “flammable” and “combustible” are used synonymously. 3.3 ignition delay tv time between the initiation of the dust dispersion and the activation of the ignition source 3.4 inert gas non-flammable gas which will not support combustion and does not react to produce a flammable gas

Key 1 Pressure sensor 2 Chemical igniters 3 Inlet for purge air / inert gas 4 Dust disperser 5 Dust container 6 Fast acting valve 7 Connecting tube 8 Outlet for exhaust gas 9 Oxygen analyser Figure 1 — 1 m³ vessel (schematic)

4.2 Explosion vessel The standard explosion vessel is an explosion pressure resistant, spherical or cylindrical vessel having a volume of 1 m³ in accordance with prEN 14460. The aspect ratio of the cylindrical vessel shall be 1:1 ± 10
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