1. Inflammation: a component of the explosion and fire hazard
To date, in risk analyses, the assessment of ignition probabilities is often carried out on a flat-rate basis, based either on values taken from databases, or on values obtained by applying mathematical models. However, the final results (probabilities of hazardous phenomena such as VCE, UVCE, flaming jet) may vary considerably depending on the quantification method used. The diagram in figure 1 illustrates the importance of taking particular care when quantifying ignition probabilities. Indeed, the diagram clearly shows that ignition is a component of fire and/or explosion risk.
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Inflammation: a component of the explosion and fire hazard
A few reminders about flammability
Bibliography
Digital media
ARIA – Technological accident database.
French Ministry of Ecology, Energy, Sustainable Development and Town and Country Planning (MEEDDAT) http://www.aria.developpement-durable.gouv
Standards
- Recommended Practice for the Classification of Flammable Liquids, Gases, or Vapors and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas - NFPA 497 -
- Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and methodology - NF EN 1127-1 -
- Explosive atmospheres: substance characteristics for gas and vapour classification – Test methods and data...
Regulations
Arrêté du 29 septembre 2005 relatif à " l'évaluation et à la prise en compte de la probabilité d'occurrence, de la cinétique, de l'intensité des effets et de la gravité des conséquences des accidents potentiels dans les études de dangers des installations classées soumise à autorisation ".
JO n° 234 du 7 octobre 2005 – NOR DEVP0540371A.
Directory
Organizations
Accidental Risk Assessment Methodology for Industries in the framework of SEVESO II directive http://aramis.jrc.it
Center for Chemical Process Safety (CCPS) http://www.aiche.org/ccps
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