Tertiary explosion protection

Constructive ( tertiary ) explosion protection does not attempt to prevent the explosion itself but is about limiting the damage caused by it. 

Hq can essentially be influenced by measures of the primary explosion protection and Hz by measures of the secondary explosin protection. Measures of the tertiary explosion protection affect principally the probability of unwanted damage effects (S). 

Following these basic statements, the Directive 99/92/EC [2] describes the measures of the primary and tertiary explosion protection as a matter of priority. These measures are essentially aimed at operating companies/users of work equipment as well as workplaces in which potentially explosive atmospheres can occur. 

Tertiary or constructive explosion protection comprises structural and other measures by which the consequences of an explosion can be reduced. 

If explosions cannot be excluded for sure, technical measures which limit the effects of an explosion to a harmless extent (no personal injuries, tolerable damages to property) (tertiary or constructive explosion protection). 

Secondary and tertiary containment are not relevant protection layers against an explosion, but are relevant to minimising the environmental consequences of a tank overflow. The significance of secondary and tertiary containment will depend on the pathways by which the gasoline from the tank (or any products such as contaminated firewater which may be an indirect consequence of the overflow) may enter the wider environment. 

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