Main gas pipelines are classified as energetically stressed objects. With an increase in their service life, there appears a need to model emergency breaks and analyze the distribution of the damaging factors of the accident. The main gas pipelines often run near residential areas and cross various communications, therefore possible accidents with gas emissions and damaging factors can negatively affect both the environment and the population. An emergency rupture of a gas pipeline section is numerically modeled in this article. The calculations of intensity of accidental gas emissions outflow and distribution of the accident damaging (the length of the methane jet in unlimited airspace, the range and height of the scattering of the soil and pipe fragments were found). The parameters of free jets of exhaust gas were determined. Such calculation is required during investigation of accidents and development of documents related to the environmentally safe operation of pipeline transport. In case of gas non-ignition, it disperses in the atmosphere with the formation of gas zones. The study of the influence of velocity, density and pressure on the emergency gas emission allows us to determine possible gas contamination zones. Graphs of distribution of static and total pressure over the ejection height, distribution of velocities along the axis of the ejected jet and along the axis of the pipeline were obtained. The ability to evaluate the parameters of free jet flow of natural gas (methane) from a damaged pipeline: the total flow rate, total pressure and flow rate at the rupture point is relevant in solving applied environmental safety problems of gas transportation facilities.
Home is a significant environment for any child with or without special needs and one of the important environments where occupational therapy is aimed to bring improvement if necessary in terms of quality of life. The current descriptive qualitative study was designed to find out parental perceptions about occupational therapies provided in their own environments with their children with special needs. The participants of the study were five parents whose children with different special needs were getting private in-house occupational therapy services provided by the researcher at the moment of the study. The data for this study was collected through semi-structured interviews. Interviews were designed to understand how parents perceive in-house Occupational Therapy Services. The findings of the study suggest significant improvements in the quality of life of their children with special needs, thus no one could specifically differ occupational therapy interventions in-home and in other professional settings. It is obvious because of the lack of settings in Armenia with Occupational Therapies and lack of information about the profession in general. Future research is recommended to be conducted between two different groups with Occupational Therapies in-home and other settings, with a larger group and more specific issues. Findings revealed that in-home services are convenient in many different aspects for parents of children with special needs and it should be considered for future practices.
Production processes sometimes are accompanied by the release of hazardous substances, the composition and volume of which is determined by the production technology. When designing ventilation systems for paint departments, special attention is paid to safety concerns, since all paint coatings are corrosive and flammable substances. Besides, solvent vapors are explosive. For local ventilation of painting chambers, it is rational to use safe exhaust systems with an ejector, which works sturdily, regardless of the release of flammable and explosive impurities. The ejector is simple in design and can operate in a wide range of changes in the parameters of the state of airflow. The model of the ejection unit is synthesized using the universal modeling package ChemCad, which contains a highly developed database of airflow parameters, which allows for solving various applied problems. Numerical modeling was carried out using the software package - FLUENT. In work, a calculation was carried out and a low-pressure ejector was designed for a typical painting booth. The calculation results are presented in the form of graphs and tables of pressures, velocities, flow rates in characteristic sections, pressure losses in the sections of the ejector installation.The ejection coefficient was also calculated.
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