During installation or repair of pipeline routes, a deviation such as a displacement of the edges of the docking elements, which is formed due to a certain mistake in preparation for welding and welding of the section, is possible. The permissible values of the displacing edges are regulated by the state standard and other regulatory and technical documentation in the field of design, installation, operation and repair of process pipelines. When identifying displacement sizes not exceeding the permissible limits, the pipeline is allowed further operation. In the future, to ensure reliable operation of the pipeline, a periodic assessment of its technical condition is carried out according to current standards. However, even the allowable displacement of the edges is a kind of stress concentrator and can be a source of crack nucleation and further destruction, which will lead to an emergency. Current methods for diagnosing and extending the life of pipelines do not include measures to assess the maximum stresses of welded joints with offsets. There is no analysis of how the displacement of the edges in certain areas affects the stress-deformed state of the entire pipeline as a whole, and what impact do co-locate technical devices have with possible geometric deviations during installation, for example, deviations from verticality. In this paper, we study the interconnection between the effects of technologically neighboring apparatuses and deviations from verticality formed during installation, as well as areas of displacement of the edges of the processing pipeline to the stress-deformed state of the pipeline as a whole.
The normative and technical documentation in the field of industrial safety establishes permissible deviation standards at which the equipment can be operated at a given technological mode and regular monitoring of the technical condition. As a rule, the main method for detecting deviations is visual and measuring control, as well as geodetic measurements, allowing fixing the admissibility or inadmissibility of geometric deviations. However, the current methods do not provide the calculation of structures with geometric deviations under current operating loads with the determination and assessment of the places of the occurring maximum stresses, as well as their values. The stress-strain state of the process equipment also does not provide the assessment from the effects of neighboring technical devices that are in the common technological system and have various geometric deviations during installation. In this paper, we study the relation of technical devices that are in a common technological system and have geometric deviations such as deviation from verticality and the displacement of the edges by the stress-strain state of the fixed support of a horizontally located apparatus.
The research of influence of long quasistatic loading on characteristics of resistance to deformations and destruction of elements of vessels and devices, is of great interest to the solution of problems of control and forecasting of their technical condition. In order to detect changes in the mechanical characteristics of 09G2S steel and changes in the structure of the material under the influence of quasistatic loading, destructive tests of the studied samples in an initial state and after establishment of extrema of tension of constant magnetic field have been carried out. It is established that long influence of quasistatic loading in the considered conditions leads to change of a condition of steel 09G2S which causes reduction of characteristics of plasticity (S) and energy of destruction and increase in resistance to plastic deformations (ay , ctts) what, in turn, can lead to a reduction temporary resource. The received results have allowed to develop the equation of assessment of a resource of the shell designs operated in the conditions of quasistatic loading, based on settlement and experimental dependence of a ratio of mechanical characteristics (cry/eTS) of steel 09G2S from duration of quasistatic loading.
The study is devoted to the research of the heat transfer process at different numbers and locations of labyrinth passages of the regenerative mold disk design by numerical modelling. The designs of the cooling disk with 6, 12 and 18 labyrinth passages are considered. It was found that the number increasing of labyrinth passages to twelve passages allows increasing the average heat transfer coefficient by 1.3 times and providing 2-fold increase in the uniformity of heat transfer. Analysis of the dependence of heat transfer in a disk with twelve labyrinth passages on the refrigerant flow showed that the greatest uniformity of temperature distribution over the disk surface is achieved when the refrigerant flow rate is 100 m3/h. An equation for the dependence of the average heat transfer coefficient from the refrigerant to the disk wall on the flow rate is obtained. It can be used to find the required flow rate of the refrigerant in order to achieve a certain average temperature when regulating the crystallization process. Thus, an improved version of the cooling disk design is proposed for the regenerative disk type mold, which provides a more efficient heat transfer compared to existing analogues, which is confirmed by the results that were obtained.
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