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PARTICULARITIES REGARDING THE TESTING IN EXPLOSIVE MIXTURES OF EQUIPMENT WITH TYPE OF PROTECTION FLAMEPFROOF ENCLOSURE -d- DESIGNED FOR USE IN EXPLOSIVE ATMOSPHERES
Abstract
The flameproof enclosure type of protection is a safety method designed to prevent the ignition of an explosive atmosphere in hazardous environments. It involves enclosing components that may generate sparks, electrical arcs, or high temperatures within a robust, explosion-resistant housing. This enclosure is engineered to withstand the pressure generated by an internal explosion of a flammable gas mixture, ensuring that the explosion does not propagate to the surrounding atmosphere. This type of protection is particularly used for electrical equipment that, under normal operating conditions, inherently produces electrical discharges, such as motors, contactors, relays, and switching devices. By containing the explosion and allowing only cooled gases to escape through carefully designed joints and flame paths, flameproof enclosures ensure that external flammable gases or vapors are not ignited. The paper aims to present specific characteristics that have been identified during testing in explosive mixtures for equipment with the flameproof enclosure type of protection. The study focuses on analyzing the behavior of such equipment under controlled explosion conditions, highlighting key observations and variations that emerged during the experimental procedures. These findings contribute to a deeper understanding of how flameproof enclosures respond to internal explosions and the factors influencing their effectiveness in preventing the propagation of ignition to the surrounding explosive atmosphere.
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References6
McMillan A., Electrical Installations in Hazardous Areas, Butterworth-Heinemann Publishing House, Great Britain, 1998
***, SR EN IEC 60079-0, Explosive atmospheres - Part 0: Equipment � General requirements, ASRO, 2018
***, SR EN 60079-1, Explosive atmospheres - Part 1: Equipment protection by flameproof enclosures "d", ASRO, 2015
***, Directive 2014/34/EU on the harmonization of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres (recast), Official Journal of the European Union, no.96, 2014
Moldovan L., Burian S., Magyari M., Fotau D., Rad M., Aspects on testing electrical equipment with type of protection flameproof enclosure �d�, Proceedings of the 19th International Multidisciplinary Scientific Geoconference (SGEM), Science and Technology in Geology, Oil and Gas Exploration, Bulgaria, Issue 1.2, Vol 19, pp 663-670, 2019 DOI: 10.5593/sgem2019/1.2/s06.083
Munro J., Impact of extremely cold temperatures on the safety of flameproof motors, PhD Thesis, Faculty of Engineering and Information Technologies, The University of Sydney, 2017
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