http://elar.nung.edu.ua/handle/123456789/7366 The scientific journal Thu, 19 Mar 2026 18:11:30 GMT 2026-03-19T18:11:30Z http://elar.nung.edu.ua/handle/123456789/7371 Title: Factors of effect on the corrosion destruction of metal of underground pipelines Authors: Polutrenko, M. S.; Fedorovych, Ya. T.; Dzudzylo, K. M. Abstract: A set of studies was conducted to determine the main factors influencing the corrosion destruction of metal in underground pipelines in two studied sections of the Pasichna-Tysmenitsa gaspipeline, covering definitions of active acidity, mass fraction of moisture, the presence of sulfate ions, and metal weight loss determined by the gravimetric method. It has been established that the pipeline in the studied sections of the route is laid in a soil of uniform acidity, which is low in pH acidic, which indicates corrosiveness of the soil in relation to steel. High soil moisture from the bottom of the pipeline in two sections of the route 18.21 and 19.73 %, respectively, contributed to increased corrosion damage of the metal. Corrosion of the studied soils was carried out on the basis of certain metal weight loss. It was established that the soils on the studied sections of the route, the distance between which was about 1000 m, relate to soils with a high and normal degree of corrosivity. High corrosion activity is characteristic of the soil along the lower generatrix of the pipeline, which leads to an increase in the corrosion rate of the metal of underground pipelines in this zone. The intensification of corrosion processes in the soil adjacent to the pipeline, with an increase in metal exposure time in soil, has been established. The presence of sulfate ions in soil water extracts leads to the development of biocorrosion with the participation of sulfate-reducing bacteria, which indicated the formation of biogenic hydrogensulfide. Tue, 01 Jan 2019 00:00:00 GMT http://elar.nung.edu.ua/handle/123456789/7371 2019-01-01T00:00:00Z http://elar.nung.edu.ua/handle/123456789/7370 Title: Defects identification of the main gas pipelines Authors: Banakhevych, Yu. V.; Banakhevych, R. Yu. Abstract: This paper describes a typical case of diagnosing and determining the causes of the formating of longitudinal cracks on the outer surface of the pipe, analyzes the current state of diagnosis of main gas pipelines. There is shown the importance of timely and correct response to diagnostic results. There is considered the experience in carrying out measures to optimize the repair processes of main gas pipelines by clearly establishing the timing of both evaluating the results of internal pipe diagnostics and the formating of repair plans, substantiating the criteria for choosing defects for repair and establishing a unified approach to the process, including technical documentation. Tue, 01 Jan 2019 00:00:00 GMT http://elar.nung.edu.ua/handle/123456789/7370 2019-01-01T00:00:00Z http://elar.nung.edu.ua/handle/123456789/7369 Title: Investigation of strength of shaped elements of the main gas pipeline Authors: Doroshenko, Ya.V. Abstract: The research has been carried out for the purpose of a complex numerical three-dimensional modeling of the stressed state of taps and tees of main gas pipelines taking into account the gas-dynamic processes occurring in these shaped elements and the temperature difference in their walls. A 3D modeling of the elbow with a 90° angle and a reinforcing pad on the main line and the drainage of the passage line of the trunk of the main gas pipeline has been carried out. There has been studied the gas flow with 3D models of shaped elements of the main gas pipeline by means of the CFD modeling. The simulation has been рerformed for the equidistant tees in which the entire flow from the main stream flows into its branch. The mathematical model is based on the solution of the Navier–Stokes equation system, continuity equation, closed by a two-parametric k -e model of the Launder–Sharma turbulence with corresponding initial and boundary conditions. The simulation results are visualized in the ANSYS Fluent R18.2 Academic Postprocessor by constructing the pressure fields on the contours and in the longitudinal and transverse sections of shaped elements. The exact values of pressure at different points of the inner cavity of the shaped elements have been determined, the places of rise and fall of pressure identified. There have been performed the simulation of the temperature difference in the walls of the drainage, the trunk of the main gas pipeline in the module ANSYS Transient Thermal. The results of CFD and temperature modeling were imported into the mechanical module ANSYS Static Structural, where the finite element method was used to simulate the stressed state of the shaped elements of the main gas pipeline, taking into account the gas-dynamic processes occurring in their internal cavity and the temperature difference in the walls. The results of the simulation have been visualized by constructing a three-dimensional color fields of equivalent von Mises stresses in the tee and in the elbow. The places of the maximum equivalent stresses in the wall of the studied shaped elements have been revealed. Tue, 01 Jan 2019 00:00:00 GMT http://elar.nung.edu.ua/handle/123456789/7369 2019-01-01T00:00:00Z http://elar.nung.edu.ua/handle/123456789/7368 Title: Simulation of chemical and technological processes of a hydrocarbon preparation plant Authors: Liaposhchenko, O. O.; Moiseev, V. F.; Marenok, V. M.; Khukhryanskyy, O. M.; Starynskyy, O. Ye.; Kovtun, V. V. Abstract: This article presents a low-tonnage oil and gas processing plant (OGPP-20), its main process equipment and the operating principle. Three methods for producing a liquefied propane-butane fraction and designs of the equipment for its implementing are proposed: compression and condensation, compression and further throttling which allows the compressed gas cool to lower temperatures and rectification. The results of numerical studies of the methods of producing liquefied propane-butane in the Aspen HYSYS program for the thermodynamic model of Peng–Robinson substantiate the method of obtaining the liquefied propane-butane fraction and its design. Tue, 01 Jan 2019 00:00:00 GMT http://elar.nung.edu.ua/handle/123456789/7368 2019-01-01T00:00:00Z