6184/4 nternational Standard TSo INTE RNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAAR OPTAHM3AUMA NO CTAHAAPTW3AUWWORGANISATION INTE RNATIONALE DE NORMALISATION Explosion protection systems Part 4 : Determination of efficacy of explosion suppression systems Systemes de protection contre les explosions - Partie 4: Determination de I'efficacite des systemes de suppression des explosions First edition - 1985-11-15 ISO 6184/4-1985 (E) UDC 614.838 Ref. No. 1SO 6184/4-1985 (E) Descriptors : explosion proofing, explosion suppression systems, tests, effectiveness Price based on 4 pages 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. 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 technicai 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 6184/4 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 latestedition,unlessotherwisestated. @ International Organization for Standardization, 1985 Printed in Switzerland ISO6184/4-1985 (E) INTERNATIONAL STANDARD Explosion protection systems Part 4: Determination of efficacy of explosion suppression systems Introduction 0 such hazards are those characterized by one or more of the following parameters : 0.1 Explosion suppression is a technique by which a develop- a) vessel aspect ratio greater than 2 : 1; ing explosion in a confined, or essentially confined, volume is detected and arrested during its incipient stage, thus limiting b) partially vented vessels; pressuredevelopmenttoasafeorpredeterminedvalueand c) container fitted with fixed or mobile apparatus which preventing or minimizing damage. could impede the distribution of suppressant; d) operating pressures and temperatures substantially The performance of an explosion suppression system is a func- tion of the following : higher or lower than normal atmospheric conditions; e) high levels of turbulence and/or product throughput; a) the nature and explosibility of the combustible material ; b) the environmental conditions of temperature, pressure, f) vessel volumes substantially greater or lower than those turbulence, product flow, etc.; used in the efficacy test. c) the size and geometry of the container; d) the effectiveness of the explosion suppressant; Scope e) the performance characteristics of the explosion sup- This part of is0 6184 specifies a method for evaluating the ef- pression hardware; fectiveness of explosion suppression systems against defined f) the deployment and choice of hardware for the system. explosions inan enclosedvolume.It gives thecriteriaforalter- native test apparatus used to undertake explosion suppression efficacy tests and criteria to be applied in defining the safe 0.2 This part of IS0 6184 is one of a series dealing with ex- operating regime of an explosion suppression system. plosion protection systems. The other parts are as follows: 2 Field of application Part 1 : Determination of explosion indices of combustible dusts in air. This part of Iso 6184 is applicable only to explosion suppres- Part 2: Determination of explosion indices of combustible sion systems intended for the protection of closed, or essential- gases in a