Cei 31-35: Pdf
The guide also provides a detailed definition of and classification examples for common components such as flanges, valves, pumps, and compressors, helping the engineer perform a precise risk assessment.
The CEI 31-35:2018 standard provides a rigorous, prescriptive methodology for classifying hazardous areas with explosive gas atmospheres, acting as a supporting guide for CEI EN 60079-10-1. It establishes specific analytical formulas and ventilation assessments to calculate "dangerous distances," offering a more detailed, conservative approach than general international standards. Access the official standard through Intertek Inform or Standards.ie .
Locate every point in a plant where flammable substances might leak.
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According to the ATEX Directive and CEI 31-35, places are classified based on the likelihood and duration of an explosive atmosphere:
: A crucial change occurred in October 2018 when the transition period for the CEI EN 60079-10-1:2010 standard expired, replaced by the 2016 edition. Consequently, the CEI officially abrogated (withdrew) the technical guides CEI 31-35, CEI 31-35/A, and CEI 31-35 V1. The CEI notes that these abrogated guides remain a useful reference for scientific methodologies that do not conflict with the new edition of the CEI EN 60079-10-1:2016, but they no longer constitute an official regulatory reference.
Identify zones where flammable gases or liquids could spark catastrophic fires or explosions. The guide also provides a detailed definition of
Under Italy’s D.Lgs. 81/08 (Title XI - Explosion Protection), employers must document a formal Explosion Protection Document (DVR ATEX). Using a non-compliant or outdated version of the classification guide can void your insurance and lead to heavy legal penalties.
The main purpose of CEI 31-35 is to help engineers, safety professionals, and plant operators apply the classification principles of CEI EN 60079-10-1 correctly to real-world industrial installations. It is applicable to both new constructions and modifications of existing plants.
A place in which an explosive atmosphere is likely to occur in normal operation occasionally. Access the official standard through Intertek Inform or
Reduces risks of over-specifying or under-specifying equipment, which can lead to unnecessary costs or safety failures.
CEI 31-35 is an Italian standard published by the Comitato Elettrotecnico Italiano (CEI), which is the Italian national electrotechnical committee. The standard, officially known as "CEI 31-35:2010," provides guidelines for the design, construction, and operation of industrial control systems, including those used in automation, process control, and electrical power distribution.
Categories ranging from High, Medium, to Low, which heavily impact the final sizing of the hazardous boundary. Hazardous Zone Assignment
Inside fuel tanks, chemical reactors, or vapor spaces of storage vessels. 2. Zone 1 (Intermittent Danger)
Evaluate how natural or artificial ventilation reduces the explosion risk. The ATEX Context: Zones and Definitions