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Explosion Hazard Classification, Explosion Safety Parameters, and Relevant Measurement Techniques Applied in the Federal Republic of Germany. Part II: Combustible, Unstable and Strongly Oxidizing Gases, Combustible Dusts.
Proceedings of the International Symposium on the Explosion Hazard Classification of Vapors, Gases, and Dusts, National Materials Advisory Board, Publication NMAB-447 1987:159-179
The classification of combustible, unstable, and oxidizing gases and combustible dusts according to their explosion potential in the Federal Republic of Germany (FRG) was discussed. Experimental parameters used for assessing the flammability limits, ignitability, explosion effect, and explosion transmissibility of flammable gases, unstable gases, and strongly oxidizing gases and combustible dusts were reviewed. These usually include the lower flammability limit, minimum ignition current and voltage, maximum explosion pressure, maximum experimental safe gap, and rate of pressure increase in the case of gases and lower flammable limit, adiabatic flame temperature, maximum explosion pressure and maximum rate of pressure rise, and minimum ignition energy the case of combustible gases. Adiabatic flame temperature is usually determined by thermodynamic calculations due to experimental difficulties associated with handling dusts. Schemes for classifying hazardous vapors, combustible gases and explosive dusts used in the FRG were summarized. Vapors of flammable liquids have been classified according to their hazard and temperature class and explosion group. Flammable gases have been classified according to their temperature class and explosion group. No scheme existed for classifying unstable and strongly oxidizing gases. Combustible dusts have been classified according to their maximum rate of pressure rise.
Industrial-safety; Combustible-gases; Laboratory-testing; Explosive-atmospheres; Dust-explosions; Ignition-point;
Proceedings of the International Symposium on the Explosion Hazard Classification of Vapors, Gases, and Dusts, National Materials Advisory Board, Publication NMAB-447
Page last reviewed: May 5, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division