Vlasin N.-I.,INCD INSEMEX Petrosani |
Lupu C.,INCD INSEMEX Petrosani |
Ghicioi E.,INCD INSEMEX Petrosani |
Cozma E.,University of Petrosani |
Arad V.,University of Petrosani
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2013
Modern computerized techniques regarding the numerical modelling of combustions are essential tools, both for engineering and for specialized research. However, the capabilities and limitations of numerical simulations have to be understood, gaining experience in theory and modelling of combustions being an imperative factor in avoiding errors with negative impact on the economy and on the occupational safety. The major evolution of the numerical computation of combustions in the few last years is based on the development of methods and tools for studying the unsteady reactive flows and is mostly due to the energy and aerospace industries. However, most of these numerical analysis techniques focus on low speed combustions, the modelling of the detonations requiring special treatment. A numerical model used in the computational simulation of fast combustions of gaseous environments assumes (but not strictly required) that it contains a sub-model for transferring the energy released by the ignition source towards the fuel fraction of the mixture and the activation of the burning process of the explosive volume. This paper work relates to a mathematical model focusing on the ignition moment and space of the fast burning of an explosive air-methane mixture which is often encountered in underground coal mining units. © SGEM2013 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.
Paraian M.,INCD INSEMEX Petrosani |
Paun F.A.,INCD INSEMEX Petrosani |
Ghicioi E.,INCD INSEMEX Petrosani |
Vatavu N.,INCD INSEMEX Petrosani |
And 2 more authors.
Proceedings of the 3rd International Conference on Advanced Materials and Systems, ICAMS 2010 | Year: 2010
During work process activities the workers might be exposed to various risk factors that could endanger their safety or health. The personnel developing activity in potentially explosive environments might be, at a certain moment, subject to fire and/or explosion hazards. Therefore, the hazard factors should be eliminated or, if this is not possible, diminished at a minimum so as a high level of safety is ensured. Generally, in order to eliminate or minimize the effects of a risk factor over a person, personal protective equipment (or PPE) is employed. As fire and/or explosion hazards are involved, the personal protective equipment, and especially clothing, must show a certain resistance to flame. The flame resistance is a characteristic parameter of the fabric that depends upon a series of other factors as: the ignition source, form, energy, exposure time, environment conditions, shape of the tested sample etc. The flame resistance of a certain fabric can be determined by laboratory tests employing standardized test methods, and the test results allow subsequent assessment of conformity with the essential safety requirements stipulated by PPE Directive. Materials' behavior under an explosion flame/pressure produced by flammable gas, vapors, mists or dusts differs from the material exposure to a standardized ignition source. In order to perform tests for conformity assessment of PPE employed in environments with explosive atmospheres in present there are no standardized methods that are able to reproduce, in laboratory conditions, the phenomena involved in explosions.
Simion S.,INCD INSEMEX Petrosani |
Vreme C.,INCD INSEMEX Petrosani |
Kovacs M.,INCD INSEMEX Petrosani |
Toth L.,INCD INSEMEX Petrosani
Applied Mechanics and Materials | Year: 2013
The troubles generated by noise represent an issue, unanimously agreed by everybody, and this have numerous psychological and social implications. The effect of sound hindrance during the carrying out of different working tasks shall tired up the spirit of attention diminishing the efficiency of one of the most important function of hearing, decreasing the efficiency of the work process. Consequently, the working capabilities shall diminish and there shall appear a state of tension, a diminution of focusing, less coordinated movements made during the working process, a diminution of the capabilities for a critical evaluation of certain situations, as a result of occupational stress. The issues related to noise are very important from an economic point of view; sometimes, the diminution of the working capability shall decrease up to 60%, the reasoning being strongly affected; there occurs a low output due to fatigue and over-stress of the workers, the mistakes made during performing certain operations, especially due to less attention moments, all these being produced by noise. The noise is a breakdown of the engineering process representing one of the most important factors leading to troubles for the personnel working in the underground coal mining. These paper analyses the way where the noise generated during the engineering process in underground mining shall influence the working capability. © (2013) Trans Tech Publications, Switzerland.
Szollosi-Mota A.,INCD INSEMEX Petrosani |
Prodan M.,INCD INSEMEX Petrosani |
Nalboc I.,INCD INSEMEX Petrosani |
Tomescu C.,INCD INSEMEX Petrosani |
Krausz I.,INCD INSEMEX Petrosani
Environmental Engineering and Management Journal | Year: 2012
The purpose of this research is to study how the natural gas transported by damaged distribution pipelines can migrate through the soil. If the gas emissions are not detected on time and the air vents are placed on inappropriate sites or are not maintained properly, gas can migrate directly throughout preferential pathways: bed sand pipes, sewer pipes, cable channels, channels for heating, then can enter the confined space and form explosive mixtures. As a proof of these phenomena, a series of events that occurred in industry and accidents suffered by civil citizens have occurred. The equipment used for emissions measurement is provided with 16 sensors to indicate the methane gas concentration. The sensors operate on the thermal conductivity principle being able to measure concentrations between 0% and 100% volume. A field version was adopted for tests to measure concentration of gases migrating through soil. For each location the soil permeability was determined using the running times distance between the source and the release detection heads. Also maps were drawn with time isolines for a particular concentration in order to characterize the dynamics of the natural gas migration, which helps improving the efficiency of solving technical expertise of the events due to natural gas explosions.
Costa C.,University of Petrosani |
Pupazan D.,INCD INSEMEX Petrosani |
Danciu C.,University of Petrosani |
Nistor C.,University of Petrosani
International Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM | Year: 2015
We have studied physical mine rescue training programs and health-related and rescue-related fitness tasks during a mine rescue competition, made in China and Australia and on these basis we have design our own pre physical training method. We have stored the heart rate measured in bites per minute (bpm) during the 2012 year periodical training for 21 mine rescuers. We have designed a physical training procedure based on six training models: Body Building, Method of isometric efforts, Method of Interval Training, Volume variation method, Structured method for basic grip and release and Specific work method. Then we measured again during the 2014 year periodical training, the heart rate for the same mine rescuer having the physical training procedure performed before. We have notice that the trained person have now lower bpm, during the tests that could represent better performances during the rescue actions. Our research were made in the Laboratory for Risk-Rescue Operations of the INCD INSEMEX Petroşani, Romania. © SGEM2015.
Incd Insemex Petrosani | Date: 2016-03-30
The present invention refers to an ultrafast insulation device for mining galleries, operating automatically, for delimiting and securing fresh air circuits from areas contaminated by burned gases, toxic and/or explosive gases, produced as a result underground events such as explosions fires. The ultrafast gallery insulation device is automatically triggered by an explosion overpressure sensor (6) or by an infrared radiation sensor (5), activating the pyrotechnic gas generator (4) which expels the shutter from the storage block (1) with subsequent inflation against the walls of the gallery. The shutters central membrane (8) is provided with zipper (9) allowing the passage of workers.