Dynamic elaboration on the Art & Science of Hazardous Area Protection
Ex (As per ATEX Directives)
This Hexagon Logo with “Ex” marked inside is as per specification of ATEX ( ATmosphères EXplosives ) . This mark along with the EC mark, is carried by all equipment complying with the ATEX directives.
What is a Directive ?
A directive is a legislative act of the European Union, which requires member states to achieve a particular result without dictating the means of achieving that result. It can be distinguished from regulations which are self-executing and do not require any implementing measures. Directives normally leave member states with a certain amount of flexibility as to the exact rules to be adopted. Directives can be adopted by means of a variety of legislative procedures depending on their subject matter. (Wikipedia)
(French Title of the special EU Directives 94/9/EC. ATEX derives its name from this French title )
The ATEX directive consists of the following two EU directives describing what equipment and work environment is allowed in an environment with an explosive atmosphere.
The aim of directive 94/9/EC is to allow the free trade of ‘ATEX’ equipment and protective systems within the EU by removing the need for separate testing and documentation for each member state
Explosive Atmosphere is a mixture with air , under atmospheric conditions, of flammable substances in the form of gas or vapour in which, after ignition, combustion spreads throughout the unconsumed mixtures. (IEC: 60079-10 ).
The Hazardous Areas (ref: IEC 60079-10, 14)
Areas in which an explosive atmosphere is present , or may be expected to be present , in quantities such as to require special precautions for the construction , installation and use of equipment. (An Area is a three dimensional region or space)
The Hazardous Contents associated with an area , are quantified through the process of Area Classification
Objectives of Area Classifications .
The basic underlying philosophy is SAFETY of life and property by quantifying the location.A special methodology is used by virtue of which an industrial location ( 3 dimensional space ) is analyzed and classified into Classes & Zones , keeping in view the chemicals/substances involved & the industrial procedures being carried out in that location.