Published: 2003-11-07
ISBN:
ISSN: 1650-3686 (print), 1650-3740 (online)
The European Directive 96/82/EC; “Seveso II”; requires the quantification of the impact induced in the event of a major accident. However; for explosive materials; no Eurocode; procedures; algorithms; nor specific reference values for damage calculations were specified within the Directive. In order to confirm the validity of “Seveso II Risk Assessments” damage calculations; EU member states can only refer back to their own previously existing legislation on explosives. But calculation methods; scaling laws; and reference values for safety distances vary from one member state to another. Also; the progress that has been made in improving the quality and safety of modern explosives has not necessarily been reflected in all state legislation; some of which is more than 50 years old.
A strong need exists; within Europe; for the adoption of a harmonized approach for assessing the potential damage from major accidents involving explosives. This article illustrates a methodology suitable for use as the basis of achieving a consistent approach within Europe. The procedure presented here is a development of a method first used for undertaking the explosion and fire hazard assessments for mass detonating explosives; which was published in the March/April 2003 issue of the “Journal of Explosives Engineering”. The original method has been further refined; by experience from the consideration of ammunition and oxidising agents; and also extended to include not only the maximum possible impact of an accident but also the maximum probable impact. Formulae for the first approximation calculation of the effects induced in the surroundings by impacting factors due to the occurrence of the accident are proposed. Threshold values for each impacting factors are given with reference to damage severity levels.
A graphical representation of the results from the hazard assessment is achieved by the use of iso-damage areas in which boundaries of the severity damage levels are fixed for each given probability of occurrence of the major accident. A list of bibliographic references is included.
Air Force Manual 91-201; 2000 Explosives and Safety Standards.
Army TM 5-1300; Navy NAVFAC P-397; Air Force AFR 88-22; 1990 Structure to resist the effect of accidental explosions. Departments of the Army; the Navy and the Air Force.
Backer Wilfred E.; Cox P.A.; Westine P.S.; Kulesz J.J.; Strehlow R.A.; 1983 Explosion hazards and evaluation; Elsevier Scientific Publishing Company; Amsterdam; Oxford; New York.
Backer Wilfred E.; 1973 Explosion in air. University of Texas Press; Austin; London.
Crull M. M.; Zehrt W. H.; 1998 Development of primary fragmentation separation distances for accidental and intentional detonations. USAE&SC.
Crull M. M.; 1998b Prediction of primary fragmentation characteristics of cased munitions. USAE&SC.
DoD 6055.9-STD; 1999 D.O.D. Ammunition and explosives safety standards.
Folchi R.; 2003 Explosion hazard assessment. The Journal of Explosives Engineering.
Held M.; 1983 TNT – Equivalent. Propellants; Explosives; Pyrotechnics.
Held M.; 1983b Blast wave in free air. Propellants; Explosives; Pyrotechnics.
Köhler J.; Mayer R.; 1998 Explosivstoffe. Wiley-VCH. NASA NSS 1740.12; 1998 Safety standards for explosives; propellants; and pyrotechnics.
NTIS; 1991 Reexamination of the airblast and debris produced by explosion inside earth-covered igloos. Naval Surface Warfare Center; Silver Springs.
Sax N. Irvin 1984 Dangerous Properties of Industrial Materials. 6a ed.; Van Nostrand Reinhold Company. United Nations; 1999 Transport of dangerous goods - model regulations; ST/SG/AC.10/1/Rev.11.
U.S. Department of Health; Education; and Welfare; 1976 Occupational exposure to oxides of nitrogen (nitrogen dioxide and nitric oxide).
U.S.A.S.C.; I.H.D.-N.S.W.C.; 2000 Minimum separation distances changed in standard.
Victor A. C.; 1996 Warhead performance calculations for thread hazard assessment. DoD Explosives Safety Seminar; Las Vegas.
