EN 26184-2:1991
(Main)Explosion protection systems - Part 2 : Determination of explosion indices of combustible gases in air (ISO 6184-2:1985)
Explosion protection systems - Part 2 : Determination of explosion indices of combustible gases in air (ISO 6184-2:1985)
Per BT C012/2006 transfer of responsibility from CEN/TC 191 to CEN/TC 305.
Explosions-Schutzsysteme - Teil 2 : Bestimmung der Explosionskenngrößen von brennbaren Gasen in Luft (ISO 6184-2:1985)
Systèmes de protection contre les explosions - Partie 2 : Détermination des indices d'explosion des gaz combustibles dans l'air (ISO 6184-2:1985)
Sistemi za zaščito pred eksplozijo - 2. del: Ugotavljanje eksplozijskih karakteristik gorljivih plinov v zraku
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Explosions-Schutzsysteme - Teil 2 : Bestimmung der Explosionskenngrößen von brennbaren Gasen in Luft (ISO 6184-2:1985)Systemes de protection contre les explosions - Partie 2 : Détermination des indices d'explosion des gaz combustibles dans l'air (ISO 6184-2:1985)Explosion protection systems - Part 2 : Determination of explosion indices of combustible gases in air (ISO 6184-2:1985)13.230Varstvo pred eksplozijoExplosion protectionICS:Ta slovenski standard je istoveten z:EN 26184-2:1991SIST EN 26184-2:1996en01-maj-1996SIST EN 26184-2:1996SLOVENSKI
STANDARD
SIST EN 26184-2:1996
SIST EN 26184-2:1996
SIST EN 26184-2:1996
International Standard 6184/z INTERNATIONAL ORGANIZATION FOR STANDARDlZATION.ME~JLYHAPO~HAR OPfAHUl3AlJMR I-IO CTAH~APTt43AL&ll4~RGANlSATlON INTERNATIONALE DE NORMALISATION Explosion protection systems - Part 2: Determination of explosion indices of combustible gases in air S ystkmes de protection contre /es explosions - Par-tie 2: D&termination des indices d’explosion des gaz combustibles dans l’air First edition - 1985-11-15 UDC 614.835 Descriptors : explosion proofing, burning gases, tests, explosion index. Ref. No. IS0 6184/2-1985 (E) Price based on 5 pages SIST EN 26184-2:1996
Forew !ord IS0 (the International Organization for Standardization) is a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each 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 part 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 IS0 Council. They are approved in accordance with IS0 procedures requiring at least 75 % approval by the member bodies voting. International Standard IS0 6184/2 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 Organization for Standardization, 1985 Printed in Switzerland SIST EN 26184-2:1996
INTERNATIONAL STANDARD IS0 6184/2-1985 (E) Explosi,on protection systems - Part 2: Determination of explosion indices of combustible gases in air 0 Introduction 0.1 The assessment of measures required to provide protec- tion against explosion hazards involving combustible gas/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. The severity of a combustible gas explosion is a function of the following : a) the chemical properties of the combustible gas; b) the concentration of the combustible gas in the gas/air mixture; c) the homogeneity and turbulence of the combustible gas/air mixture ; d) the type, energy, and location of the ignition source; e) the geometry of the container; f) the temperature, and pressure of the combustible gas/air mixture. 0.2 This part of IS0 6184 is one of a series dealing with ex- plosion protection systems. The other parts are as follows: Part 1 : Determination of explosion indices of combustible dusts in air. Part 3: Determination of explosion indices of fuel/air mix- tures other than dust/air and gas/air mixtures. Part 4 : Determination of efficacy of explosion suppression systems. 0.3 The interpretation of explosion indices determined by the method specified in this part of IS0 6184 and their relation to the development of explosions in commonly encountered ex- plosion hazards should be recognized. In particular, the degree of turbulence can influence the hazard significantly. In practice, the link between a given degree of turbulence and a specific type of hazard is the responsibility of specialists in the fields of explosions and explosion protection. Two extremes of turbulence commonly encountered in in- dustrial plants are : a) quiescent conditions prevailing in storage vessels; b) high turbulence conditions prevailing in the region of an extraction fan. It should be realized that turbulence can arise in two ways: a) turbulence intrinsic to the plant, under normal operating conditions, as a consequence of perturbations to the air-flow ; b) turbulence induced by obstructions within an instal- lation on a gas which expands as the result of an explosion. 1 Scope This part of IS0 6184 specifies a method for the determination of the explosion indices of combustible gases with air in an enclosed space. It gives the criteria by which results obtained using other test procedures can be correlated to yield explosion indices as determined by the method specified in this part of IS0 6184. 2 Field of application This part of IS0 6184 is applicable only to the determination of explosion indices pertaining to the development of contained gas/air explosions after ignition of reactants. It does not apply to indices pertaining to the conditions necessary to cause 1 SIST EN 26184-2:1996
IS0 6184/2-1985 (El ignition of the reactants. If the specified experimental pro- cedure for the determination of explosion indices does not result in ignition of the gas/air mixture, it should not be con- cluded that the gas in question cannot explode. The interpret- ation of such cases should be left to specialists in the field of explosions and explosion protection. 3 Definitions For the purpose of this part of IS0 6184 the following defini- tions apply. 3.1 explosion : Propagation of a flame in a pre-mixture of combustible gases, suspended dust(s), combustible vapour(s), mist(s), or mixtures thereof, in a gaseous oxidant such as air, in a closed, or substantially closed, vessel. 3.2 explosion index: Numerical term, determined in accord- ance with the test methods specified in this part of IS0 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, and seconds respectively, of a typical explosion. expressed in bars’) 3.2.1 explosion indexp,: Maximum overpressure relative to the pressure in the vessel at the time of ignition attained during an explosion. 3.2.2 explosion indexp,,,: Maximum va
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