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[Key words] pipeline; control valve; material selection CLC number: G711 Document code: A Article ID:1009-914X(2019)02-0036-01
First, the choice of pipeline control valve material In essence, the valve is an important part of the oil pipeline, and in the process of oil transportation, has played a major role. From the selection of the material of the outer wall of the valve, not only the superb material process is required, but also the method and quality cost of controlling the process according to a certain procedure. From the perspectives of thermal conductivity and thermal expansion, processability, and corrosion resistance, we analyze them based on the overall perspective [1]. From the point of view of the influence of thermal conductivity, when constructing a welding and forging, heat treatment and other process models, it is necessary to analyze the thermal conductivity of the valve. From the influence of the expansion coefficient, it is mainly the phenomenon of expansion or contraction that occurs with the change of temperature. According to this characteristic, the material of high metal or ceramic is selected, and the material is lower than that of the polymer material. From the perspective of the impact of corrosion resistance, it is mainly the influence of the erosion ability of various media [2]. At this time, it can be found that the corrosion-resistant material can resist various media. In other words, the corrosiveness of non-metallic materials is much higher than that of metallic materials, and in the actual extension, it shows the economic value. From the perspective of process performance, the main manifestation is the flow capacity of the molten material. From the perspective of casting performance, it mainly shows the main contents of liquidity and shrinkage. From the point of view of shrinkage, it mainly shows the shrinkage exhibited by the volume or size reduction that may occur during the solidification or cooling of the valve. Shrinkage is not only as simple as changes in size and volume, but more importantly, it indirectly affects shrinkage or looseness, internal stress, deformation, cracking, etc. caused by the size or volume reduction of the valve body. Therefore, according to the above, it can be found that in the process of casting, the material to be selected is more biased toward a material having a smaller contraction force. The analysis from the perspective of segregation is mainly due to the difference in internal chemical composition and tissue unevenness after the valve is solidified. This difference does not make the quality of the product better, but it has the counterproductive result. Therefore, in the choice of materials, cast materials such as cast iron are generally selected [3].
Second, the pipeline control valve stress analysis and treatment (a) oil pump valve force analysis Because the valve in the entire oil transportation process, for the safety and reliability of the oil delivery valve, played an important role. The impact analysis of the control valve is carried out for the pressure changes presented during the transportation process. According to this goal, a comprehensive analysis, including the valve material, surgical thickness, stress and other aspects of the main content. Therefore, it needs to be discussed in three directions. First, when the valve is subjected to elastic aging, the pressure in the cylinder will reach the limit. In other words, in the process, it will lead to the inside of the cylinder. The failure of its own elasticity. Second, because the material inside the valve is replaced in a long time, if it is deformed, it will cause its own role in the entire cylinder to lose its original effect. In this case, it is necessary to replace the internal and external materials in time to ensure the advantages of the entire oil pipeline. Third, in the process of using the wall, the valve flexibility will decrease due to resource conditions and external blasting [4]. Then stop using it, and after normal solution, it will be used normally.
(2) The stress and treatment of the finite element are analyzed from the perspective of three-dimensional modeling. The solid three-dimensional modeling of the valve can be used to analyze the physical properties of the valve body or the material selection of the valve body and the load of the valve body. In order to save the computer resources to a certain extent, it is necessary to load the subsequent conditions according to the internal structure of the valve, and according to the actual situation, cut out to shorten the solution time. From the perspective of the model, the main idea is to import solidworks into ANSYS. And compare the changes of the model before and after the introduction, to ensure the integrity of the information and improve reliability. From the perspective of unit type and material data analysis, the main contents are the structural features, load types, and demand analysis. For each node, between each degree of freedom, precise calculation of the force and deformation is achieved. From the perspective of network partitioning and its constraints, the simartsize intelligent sub-network is mainly used for classification accuracy, and the network density is divided according to the characteristics and size of the valve model. From the application of the load, it is mainly for the deformation of the X or Y axis of the valve, selecting the symmetrical section of the valve body model, increasing the hydraulic pressure test pressure, and ensuring that the pressure load is within the normal use range. From the perspective of solving, the analysis is mainly based on the node and unit division of the object, and the construction of the equilibrium equations is realized according to the division. At the same time, it is necessary to select the place of control and the control range, and solve it according to the default solution instruction. In essence, the stress of the valve is generally less than the ultimate stress value, and is constructed according to the safety margin, showing the mild safety of the valve structure and meeting the design requirements. In other words, there are large stresses at the two flange joints inside the valve. The emergence of this kind of situation is not in the simple sense, but in the process of model making, the two flange faces are bonded together and the shape changes and appears [5]. At this time, it is necessary to carry out the safety bath according to the limit stress value, emphasizing the safety degree of the valve structure.
Summary With the advancement of society, the control valve plays a very important role in the process of modern factory automation control. Therefore, it is necessary to select the pipeline control valve material according to the functional requirements, the process requirements, the economic needs, and the like. On this basis, the design and force of the valve in the oil pipeline are analyzed and demonstrated. On the basis of the structure, analyze the deepest law, use the three-dimensional mechanics to carry out the limit element analysis, and finally, get the best design. At the same time, it is necessary to analyze the various factors involved in the pipeline control valve from the overall perspective to ensure the design and application of the control valve in the oil pipeline.
references:
[1]Wang Lei. Optimizing the process of oil pipeline to achieve energy saving and consumption reduction operation [J]. Chemical Industry Management. 2017(32):15-16
[2]Zheng Cheng. Optimizing the process of oil pipeline to achieve energy saving and consumption reduction operation[J].China Petroleum and Chemical Industry Standards and Quality. 2017(09) :66-67
[3] Xu Jin, Duan Xinghua. Course construction of “oil pipeline operation and maintenance†based on work process [J]. Petroleum Education. 2016(06) :52-53
[4] Li Jinlong. Analysis on the construction management of oil pipeline grabbing maintenance equipment [J]. Science and Technology Innovation and Application. 2017(10): 44-45
[5]Wang Peng. Thoughts on the management of the navigation management of Jingxian Oil Pipeline [J]. China Management Information. 2013(23):89-90
Author brief introduction Feng Cheng, date of birth: 1981.10.7, gender: male, education: specialist, national: Han, native (accurate to the city): Mianyang, Sichuan Province, current position: mechanical engineer, current title: junior (assistant engineer) , Research direction: pipeline valve design.
[Abstract] With the continuous development of the times, people's demand for oil and gas has also increased a lot of space, but this kind of energy is a non-renewable energy. At this time, we want to ensure that oil and gas can meet people's daily needs. Therefore, we should pay attention to the storage and transportation of oil and gas. And on this basis, complete the implementation of the sustainable development strategy of China's oil and gas industry. For the oil pipeline, the valve plays a very important role in the internal oil and gas control of the entire pipeline. The control valve not only changes the direction of the medium, but also enhances the effective application of the oil pipeline. In the process of oil and gas transmission, it undertakes the main functions of opening, closing and pressure regulation of oil and gas transportation. It is also affected by temperature and oil properties during use. The requirements for thermal conductivity, corrosion resistance, and processability of the material on the outer wall of the valve were analyzed. In order to improve the safety and reliability of oil transportation. Therefore, in the design process, it is necessary to carry out a comprehensive analysis according to the choice of pipeline control valve material and the analysis and processing of the force, and finally obtain a scientific design plan.