Scholarly record
CONSIDERATIONS REGARDING THE DYNAMICS OF CONCENTRATIONS IN ARTIFICIALLY VENTILATED ROOMS FOR EXPLOSIVE ATMOSPHERES
Abstract
The article considers the dynamics of flammable substances concentrations in ventilated rooms. Ventilated rooms are used for equipment and installations where the risk of explosion is caused by the presence of flammable substances such as gases, vapours and mists. The first part presents the explosion risk associated with presence of flammable substances and the classification of atmospheres in which explosion risk is noticeable. Thus, for areas where the explosive atmosphere can be delimited inside a compartment and a classification of explosive atmosphere outside this compartment is not desirable, this compartment can be designed as a ventilated room. The second part presents the type of protection through artificially ventilated rooms, requirements of protection types and applicable tests. Thus, in order to ensure protection to explosion through ventilated rooms, these must comply with specific applicable requirements such as: minimizing the possibility of accidental or otherwise release or entry of an abnormal volume of flammable gases or vapours, the safety monitoring system must be eligible for the situation of non-functional ventilation, the air flow provided by ventilation must be sufficient to control the internal source of release. In the third part, a parameterized simulation of flammable substances concentration is performed, using theoretical models according to specific standards for area classification in case of explosive atmospheres and also pressurized equipment. As a conclusion, the indirect estimation of flammable substance release rate could be done using the dynamics of the concentration, also it can be mentioned that the value of admissible flow of flammable substance released inside ventilated rooms is dependent on available ventilation, on the lower flammability limit of flammable substances released inside, on the parameter that characterizes the number of air changes and the coefficient that qualifies the non-uniformity of distribution of the flammable substance concentration.
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References10
ATEX Directive, Directive 2014/34/EU of the European Parliament and the Council of 26 February 2014 on the harmonization of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres, Official Journal of the European Union, L96/309, 29.03.2014;
Burian S., Ionescu J., Darie M., Csaszar T., Andriş A., Requirements for Installations in Areas with Explosive Atmosphere, Other than Mines, (in Romanian), INSEMEX – Petrosani Publishing House, 2007;
Government Decision no. 1058 of August 9, 2006 on the minimum requirements for improving the safety and health protection of workers who may be exposed to a potential risk due to explosive atmospheres, 2006;
Government Decision no. 245 of April 6, 2016 on establishing the conditions for making equipment and protection systems intended for use in potentially explosive atmospheres available on the market the, 2016;
Maria Prodan, Maria Mitu, Domnina Razus, Dumitru Oancea, Spark ignition and propagation properties of methane-air mixtures from early stages of pressure history, Revue Roumaine de Chimie, 2016, 61(4-5), 299-305.
Prodan, Maria; Ghicioi, Emilian; Lupu, Constantin; Nălboc, Irina; Szollosi-Mota, Andrei., Flammability characterisation of a petroleum derivative for increasing the safety of personnel and environmental protection, International Multidisciplinary Scientific GeoConference: SGEM; Sofia, Vol. 4, (2016).
SR EN (IEC) 60079-0:2018 - Explosive atmospheres - Part 0: Equipment – General requirements, ASRO, 2018;
SR EN (IEC) 60079-10-1:2016 - Explosive atmospheres. Part 1. Classification of areas. Explosive gas atmospheres, ASRO, 2016;
SR EN (IEC) 60079-13:2018 - Explosive atmospheres. Equipment protection by pressurized room "p" and artificially ventilated room "v", ASRO, 2018.
SR EN (IEC) 60079-2:2015 - Explosive atmospheres. Part 2. Equipment protection by pressurized enclosure "p", ASRO, 2015.
Citing literature
Number of times cited according to Crossref: 2
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