Explosion risk assessment for already installed equipment

The equipment of installations for the processing, transport or storage flammable substances which may generate an explosive atmosphere, in around them, must be assessed terms risk explosions, both when they are put into operation installation is modified and periodically verify that initial level protection maintained. purpose assessment to establish appropriate protective measures prevent sources ignition could initiate atmospheres. Explosion obligation employer who draw up explosion document, as regulated GD 1058/2006 transposing European Directive 1999/92/EC. process focuses primarily on formation atmospheres then presence activation sources. principle reduce probability source occurring at same time a minimum acceptable according applicable norms standards. paper presents some aspects regarding evaluation explosions already installed equipment, assembled installation, depending specific conditions.