Gas turbine driven power plants are subject to a number of new European Directives. The paper refers to the ATEX Directives and contains recommendations from a UK perspective of particular relevance to suppliers and users of gas turbines. It describes specifically the application of demonstrably effective dilution ventilation as a basis of safety and includes CFD methodology recommendations and a leak size determination method. It includes detail on the development and progress of the new ISO/European gas turbine safety standard intended to give further guidance and form a basis of compliance with Directives. It includes details of an extensive Industry funded research project intended to provide a better founded ventilation design basis. Its scope includes micro turbines as well as the full range of industrial and aero-derivatives. This paper follows from ASME 98-GT-215 [1].

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