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3. Determining free-field overpressures
3.1 Preamble
Assessing the effects of a gas explosion on the environment or on a structure mainly involves characterizing the overpressure field caused by the propagation of the overpressure wave from the source of the explosion.
The airborne overpressure wave propagating from the explosion site is called the incidental or free-field overpressure. This is the explosion overpressure without interference from any obstacles that may modify the flow characteristics, and in particular induce local amplification phenomena.
The overpressure wave can be broken down into two terms, the effects of which can be significantly different at obstacles:
a "static" overpressure or "blast" in the sense of...
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Determining free-field overpressures
Probabilistic approach to gas explosions – explosion hazard
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/
Software tools
AUTOREAGAS, CFX, FLUENT. ANSYS INC. Southpointe 275 Technology Drive Canonsburg, PA 15317, USA http://www.ansys.com
FLACS – FLame Acceleration Simulator. GEXCON AS Fantoftvegen 38 N-5892 Bergen, Norway http://www.gexcon.com
OpenFOAM – The Open...
Standards and norms
AFNOR EUROCODE 1: Actions on structures – Part 1–7: General actions – Accidental actions, EN 1991-1-7 (July 2006).
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.
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