JOURNAL OF HYDROCARBON POWER ENGINEERING 2018-09-13T14:03:57+03:00 Mykhailo Myslyuk Open Journal Systems <div class="thumbnail elemBordersquare">&nbsp;</div> Increase of durability of three-cone rock bit cutters 2018-09-13T13:41:25+03:00 R. S.Yakym, D. Yu.Petryna <p>The influence of physico-mechanical and technological indices on the crack resistance of different melting of 14HN3MA-B<br>steel for three-cone rock bit cutters has been studied. When the strength index values of rock bit steel melting are about DI=4.0 or<br>in the case of the tendency of this steel to crack formation, the rolled stock shall be subjected to diffusion annealing prior to<br>forging. The cone blank manufacturing shall be performed by forging of rolled stock if the deformation is not less than ε=40 %.<br>It is also necessary to perform the quench to 830±10 °С after carbonizing, and the second hardening shall be performed with<br>temperature of 870 ºС as a starting point.</p> 2018-09-13T11:01:32+03:00 ##submission.copyrightStatement## Use of dispersive additives to ensure high indicators of physico-mechanical properties of functional polymer coatings 2018-09-13T13:32:10+03:00 A. V.Buketov, О.О.Sapronov O.V.Leshchenko, S.V.Voronenko <p>The paper presents a method for improving the properties of protective coatings by injecting an optimal content of additives<br>in the form of manufactured industrial wastes, which reduces the cost of the composition when eliminating the effects of<br>corrosion damage of oil and gas main pipelines. It has been established that it is expedient to use particles of granularity equal to<br>63 mm for the formation of the adhesive layer of coating. Whilst for the formation of the functional layer of coating it is<br>expedient to use particles of granulated slag dispersion equal to 80 mm. It has been proven that, depending on the degree of<br>filling, the epoxy composites can be characterized by elastic properties and be distinguished by high rigidity. There has been<br>analyzed the structure of epoxy composites by the method of optical microscopy and determined the optimal concentrations of<br>the filler, at which a uniform distribution of particles in volume occurs, and the possibility of agglomeration of disperse particles<br>has been excluded. This allows using materials and coatings based on them for a long-term operation.</p> 2018-09-13T11:14:58+03:00 ##submission.copyrightStatement## Increasing the reliability of the equipment of oil and gas transportation industry due to polymeric nanocomposites 2018-09-13T13:32:11+03:00 A.V. Buketov, M.Yu. Amelin R.Yu. Negrutsa, A.V. Sapronova O.M. Bezbach, S.V. Voronenko <p>On the basis of the performed tests of the thermophysical properties of epoxy composites filled with nanoparticles, using<br>modern research methods, the permissible temperature ranges have been set, at which it is possible to use the developed<br>materials. The thermal coefficient of linear expansion (α) and heat resistance (Т) of epoxy composites have been investigated.<br>The absolute values of the thermal coefficient of linear expansion of materials, which can be used in different temperature ranges,<br>have been defined. It has been proved that for the formation of composite materials with enhanced thermophysical properties, it<br>is advisable to use a nano filler in the amount of q = 0.5 %. This material is characterized by the highest activation energy,<br>resistance to structural change at the highest temperatures and intense interaction of functional groups of the filler and epoxy<br>oligomer during the formation at the molecular level among all investigated materials.</p> 2018-09-13T11:31:43+03:00 ##submission.copyrightStatement## The study of the stress-strain state of trunk gas pipeline sections with defects in the shape of the cross-section of the pipe 2018-09-13T14:03:57+03:00 Ya.V. Doroshenko, L.D. Pylypiv, К.А. Poliarush, Yu.І. Doroshenko <p>There is carried out 3D modeling of the trunk gas pipeline sections with defects in the cross section shape of the pipe -<br>dents and ovalities. The ANSYS Fluent R18.0 Academic software packge simulates gas flow through these sections of the gas<br>pipeline. The mathematical model of the gas motion is based on the solution of the Navier–Stokes equations and the energy<br>transfer, closed by a two-parametric model of the Launder–Sharma turbulence, using a wall function with corresponding initial<br>and boundary conditions. The structure of the gas flow in the sections of the gas pipeline with defects of the cross section shape<br>of the pipe is investigated. The simulation results were visualized by designing flow lines, the fields of velocity and pressure<br>modules on the contours, in longitudinal and cross-sectional sections. The exact values of velocity and pressure at different points<br>of the inner cavity of gas pipeline sections with defects in the cross-section shape were determined. The places of slowdown and<br>acceleration of gas flow, increase and decrease of pressure were found.</p> 2018-09-13T13:26:42+03:00 ##submission.copyrightStatement## Experience of operation of electronic database of full-text standards HAMMER in PJSC "Ukrtransgaz" 2018-09-13T13:32:11+03:00 A. Klyun, M. Karpash I. Trebulova, G. Kogut <p>In the article, the mechanism of effective normative document provisioning is comprehensively studied, statistical studies<br>on the use of various NDs types in the Company are analyzed; the indicators of the priority use of NDs are analyzed;<br>development and improvement trends of the regulatory base for gas transmission industry of Ukraine following the abolition of<br>the standards of the former USSR and the introduction of modern European and international standards in Ukraine are<br>highlighted. The aim of this study is to represent the results of implementation of an electronic data-retrieval system of full-text<br>operating normative documents in PJSC “Ukrtransgaz”, emphasizing on the necessity of upgrading the existing normative<br>documents. The paper demonstrates a relatively new approach to management of standards necessary for operation of a big<br>service provider in the gas supply sector of Ukraine.</p> 2018-09-13T12:15:33+03:00 ##submission.copyrightStatement## Study of the influence of thermal factors on the welding process of polyethylene gas pipelines 2018-09-13T14:00:32+03:00 M.V. Panchuk, L.S. Shlapak, N. Theremko, M. Szkodo, W. Kiełczynski, S.O. Kishka <p>A one-dimensional calculation scheme is proposed with the help of which it is possible to determine and set the<br>technological parameters with the accuracy to be realized in production conditions: the temperature of the heating element and<br>the heating time, which allows maximum mechanization of the technological operations of polyethylene gas pipelines welding.<br>The numerical value of the coefficient of temperature for polyethylene grade PE-80 is determined and it is found that the<br>presence of molten polymer mass at the ends of pipes is an additional source of their heating and a significant factor in obtaining<br>high quality and reliable welds.</p> 2018-09-13T13:09:26+03:00 ##submission.copyrightStatement## The method of segmentation of stochastic cyclic signals for the problems of their processing and modeling 2018-09-13T13:32:10+03:00 I.V. Lytvynenko <p>The segmentation method (signal partitioning into specific sections, segments) of a cyclic stochastic signal is considered.<br>Taking into account cyclicity attributes, segmental cyclic and segmental zone structure, there is proposed a method for solving<br>the segmentation problem of a cyclic stochastic signal with a stable or replaceable rhythm. The information obtained on the<br>segment structure allows us to analyze the rhythm: to estimate the value of the period in the case of a stable rhythm, and in the<br>case of a variable rhythm - the rhythmic structure (discrete rhythm function). There are given the examples of segmentation of<br>modeled and real cyclic signals, and the accuracy of the developed segmentation method is estimated.<br>The developed method can be used in digital process automation systems (diagnostics and forecasting) of cyclic data:<br>cardiac signals of various physical nature, cyclic economic processes, gas consumption and energy consumption processes,<br>surface processes of relief formations of modern materials.</p> 2018-09-13T00:00:00+03:00 ##submission.copyrightStatement##