SIST EN 26184-1:1996

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosions-Schutzsysteme - Teil 1 : Bestimmung der Explosionskenngrößen von brennbaren Stäuben in Luft (ISO 6184-1:1985)Systemes de protection contre les explosions - Partie 1 : Détermination des indices d'explosion des poussieres combustibles dans l'air (ISO 6184-1:1985)Explosion protection systems - Part 1 : Determination of explosion indices of combustible dusts in air (ISO 6184-1:1985)13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 26184-1:1991SIST EN 26184-1:1996en01-maj-1996SIST EN 26184-1:1996SLOVENSKI
STANDARD



SIST EN 26184-1:1996



SIST EN 26184-1:1996



SIST EN 26184-1:1996



International Standard -18411 INTERNATIONAL ORGANIZATION FOR STANDARDlZATION.ME~AYHAPO~HAR OPTAHM3ALhlR l-l0 CTAHAAPTbl3A~W’l~ORGANISATlON INTERNATIONALE DE NORMALISATION Explosion protection Systems - Part 1 : Determination of explosion indices of combustible dusts in air S yst&mes de pro tection con tre /es explosions - Partie I : 06 termina tion des indices d’explosion des poussleres combus tibles dans l’air First edition - 1985-11-15 UDC 614.835 Ref. No. ISO 6184/1-1985 (EI Descriptors : explosion proofing, dust, tests, explosion index. Price based on 5 pages SIST EN 26184-1:1996



Foreword ISO (the International Organization for Standardization) is a worldwide federation of national Standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Esch member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, govern- mental and non-governmental, in liaison with ISO, also take patt in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6184/1 was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire fighting. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. 0 International Organkation for Standardization, 1985 Printed in Switzerland SIST EN 26184-1:1996



INTERNATIONAL STANDARD ISO 6184/1-1985 (E) Explosion protection Systems - Part 1 : Determination of explosion indices of combustible dusts in air 0 Introduction type of hazard is the responsibility of explosions and explosion protection. specialists in the fields of 0.1 The assessment of measures required to provide protec- tion against explosion hazards involving combustible dust/air mixtures requires Prior determination of the potential explosion severity of such mixtures, by the measurement of explosion indices. Conversely, the measurement of the effectiveness and Performance of explosion protection Systems requires that they should be tested against explosions of known severity. Two extremes of turbulente dustrial plants a re : commonly encountered in in- a) low turbulente conditions prevailing in a gravity-fed Silo ; b) high turbulente conditions prevailing in a grinder or micronizer. The severity of a dust explosion is a function of the following : lt should be realized that turbulente tan arise in two ways: a) the physical and Chemical proper-Ges of the dust; a) turbulente intrinsic to the plant, under normal operating conditions, as a consequence of perturbations to the air-flow ; b) the concentration of dust in the dust/air mixture; c) the ture ; homogeneity and turbulente of the dust/air mix- b) turbu lence induced by obstructions within an installa- tion on a gas which expands as the resu lt of an explosion. d) the type, energy, and location of the ignition Source; e) the geometry of the Container; 1 Scope f) the temperature, dust/air mixture. pressure and humidity of the explosive This part of ISO 6184 specifies a method for the determination of the explosion indices of combustible dusts suspended in air in an enclosed space. lt gives the criteria by which results ob- tained using other test procedures tan be correlated to yield ex- plosion indices as determined by the method specified in this part of ISO 6184. 0.2 This par-t of ISO 6184 is one of a series dealing with ex- plosion protection Systems. The other Parts are as follows: Part 2 : Determination of gases in air. explosion indices of combustible Part 3 : Determination tures other than dust/ of explosion indices of and gas/air mixtures fuel/air mix- 2 Field of application air This part of ISO 6184 is applicable only to the determination of explosion indices pertaining to the development of contained dust/air explosions after ignition of the reactants. lt does not apply to indices pertaining to the conditions necessary to Cause ignition of the reactants. If the specified experimental pro- cedure for the determination of explosion indices does not result in ignition of the dust/air mixture, it should not be con- cluded that the dust in question cannot explode. The inter- pretation of such cases should be left to specialists in the field of explosions and explosion protection. Part 4 : Determination Systems. of eff icacy of explosion suppression 0.3 The interpretation of explosion indices determined by the method specified in this part of ISO 6184 and their relation to the development of explosions in commonly encountered ex- plosion hazards should be recognized. In particular, the degree of turbulente tan influence the hazard significantly. In practice, the Iink between a given degree of turbulente and a specific SIST EN 26184-1:1996



ISO 6184/1-1985 (El 3 Definitions For the purpose of this part sf ISO 6’l%4 the following defini- tions apply. 7om 1 explosion : Propagation of a flame in a pre-mixture of combustible gases, suspended dustk), combustible vapourk), mist(s), or mixtures thereof, in a gaseous oxidant such as air, in a closed, or substantially closed, vessel. 3.2 explosion index: Numerital term, determined in accord- ante with the test methods specified in this part of ISO 6184, which characterizes the contained explosion of a specified con- centration of reactants in a vessel having a volume of 1 m3. NOTE - Figure 1 shows the pressure/time curve, expressed in barsl) and seconds respectively, of a typical explosion. 3.2.1 explosion indexp,: Maximum overpressure relative to the pressure in the vessel at the time of ignition attained during an explo
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