New trend in classification of hazard of explosive atmosphere in laboratory workplaces

TitoloNew trend in classification of hazard of explosive atmosphere in laboratory workplaces
Publication TypeJournal Article
Year of Publication2008
AuthorsDi Benedetto A, Dolcetti G, Grimaz S, Russo P, Salzano E
JournalChemical Engineering Transactions
Volume13
Pagination109-114
ISBN Number978-88-95608-07-5
Abstract

Current EU legislation makes the classification of workplaces in hazardous zones as
compulsory, in order to prevent explosions. The procedure requires in-depth knowledge
about the sources of ignition and the potential sources of risk as described in the ATEX
137 Workplace Directive 1999/92/EC. To this aim, the hazard ofsubstances is typically
classified as function of specific physical and chemical properties which are relevant
with respect to risk issues.
However, some other parameters which may affect the overall hazard of substances in
confined or semi-confined spaces, such as the ventilation rate and the total quantity of
substance have to be take into account.
In this work, we propose a new view of explosion hazard classification as function of
the diffusion and residence characteristic times other than physical and chemical
properties. This classification has been applied to the case of a research chemical
laboratory where different chemical substances are used in small amounts.