[Abstract] With the gradual development of the times, the oil pipeline system in the construction of China's industrial system is gradually improving, but there are still problems in the leakage of oil pipeline valves, which has affected the further development of the oil transportation system to some extent. To this end, designers should design corresponding solutions to solve such problems, and current acoustic detection systems should be worthy of study.
[Key words] acoustic detection system; analysis of internal leakage status; research CLC number: C912 Document code: A Article ID: 1009-914X(2019)04-0280-01
I. Analysis of the internal leakage of the oil pipeline valve (1) Vibration caused by the pressure wave In the oil transportation process of the oil pipeline system, because the oil delivered is in a liquid state at normal temperature, according to a large number of physical science experiments, this Liquids in the class produce pressure waves in the pipeline. The frequency and wavelength of the generated pressure wave also change irregularly with time. This series of impact phenomena can cause vibration of the valve body and the pipe.
At the same time, the pressure wave changes at any time. An invisible shearing force and friction force are also formed in the valve body and the pipe. As time passes, the shearing force and friction force generate noise in the valve body and the pipe, which leads to the inside of the oil pipeline. vent. If such problems are widespread and cannot be effectively solved in time, they will slowly affect China's oil pipeline system, and to a certain extent, it will bring about a lot of unnecessary troubles.
(2) In the past, the equipment for detecting the leakage of the oil pipeline valve was not advanced. In the past, the detection device for the leakage of the oil pipeline valve was not reasonable enough to fit the acoustic emission parameters of different leakage rates, and there must be some errors of large and small. On the other hand, in the past, in the process of power spectral density analysis of acoustic emission signals, a large amount of relatively accurate data cannot be obtained, which also causes the sensitivity of the device to be greatly reduced. Therefore, the existence of various reasons makes the equipment for detecting the internal leakage of the oil pipeline valve not advanced enough, which leads to the problem that the leakage inside the oil pipeline cannot be well solved. Moreover, domestic research on valve internal leakage is based on the principle of large numbers, and it is rarely practiced in engineering applications.
2. Analysis and research on the internal leakage of the oil pipeline valve based on the theory of acoustic detection system (1) The acoustic detection system can reduce the impact of pressure waves. Valves and pipelines are an important part of the oil pipeline system. The normal operation of valves and pipelines is for the transmission. The transportation of oil systems has an important impact. At present, the acoustic detection system that designers should study can ensure the normal operation of valves and pipelines to the greatest extent. The relevant inspectors can use the low-frequency transmitter of the acoustic detection system to perform normal detection of the oil pipeline during operation, and accordingly estimate accordingly.
The estimated time-domain variation of the relevant acoustic emission parameters is used to characterize the valve internal leakage rate in a specific place. According to the scientific data, the influence of the pressure wave on the oil pipeline can be obtained, and corresponding countermeasures can be taken. On the other hand, the acoustic detection system can also perform acoustic emission positioning on the leakage of the pipeline, and the staff can conduct positioning research in time, which has a general prediction on the impact of pressure wave and shear force, and the staff can Through these data, the pipelines of different parts are repaired and maintained differently, so that the oil pipelines can be properly and timely maintained.
(II) Experimental Procedures of Acoustic Detection System Relevant personnel should conduct a large number of experiments in the laboratory before practice to prove the superiority of the acoustic system. First, a liquid valve internal leak detection device is built in the laboratory, and the acoustic emission detection system of the acoustic detection system is used for inspection and testing. The liquid valve internal leakage device is composed of a plurality of parts, which are composed of an air compressor, a gas booster, a buffer tank, a gate valve and related supporting parts. The volume of the buffer tank can be controlled according to the size of the experiment conducted, and the diameter and height are generally no more than three meters. At the same time, a certain pressure is applied to the buffer tank, which is about 2.2 kPa. Of course, the symbol of the valve must be marked, which will bring great convenience to future experimental work. The valve has a nominal diameter of approximately 150 mm. In addition, the acoustic emission system of the experimental device is composed of a PAC sensor, a preamplifier, and a data acquisition card PCI-8 acoustic emission detector. At the same time, in order to more imitate the real situation, the experimenter can adjust it manually. The reason why it is done so precisely is to completely imitate the situation of the scene.
Then connect the pressurization system to the buffer tank and the valve line, and inject a certain amount of water into it, not too much water, otherwise the effect of the experiment will be affected and the acoustic detection system will be activated. Coupling the device of the acoustic detection system with the pipeline, and also ensuring the stability of the acoustic system connection, it is necessary to look at the various scientifically valid parameters displayed by the instrument.
(3) The experimental conclusion is obtained, which proves that the advanced nature of the acoustic detection system is detected by the acoustic detection equipment. The acoustic detection system can accurately obtain the experimental variation of the phenomenon, which is more accurate than the previous equipment, and the equipment further analyzes the acoustic emission parameters. The relationship between distribution and valve opening. This relationship can be presented in the form of a graphically clearer and more intuitive display on the acoustic detection device. The reality of the test image can be used to derive the ASL value change of the pipeline under different pressure and opening acoustic emission parameters. Figure, the range of variation of the RMS value of the acoustic emission parameters under different opening degrees and pressures, and the variation of the parameters of the acoustic emission signal parameters under different opening degrees and pressures.
As shown in the figure, as the opening degree of the valve does not increase, the various correlation values ​​of the acoustic emission parameters of the valve leakage will increase accordingly, and the trend of the relevant parameter value will increase faster and faster. At a certain level, it will not grow, that is, the so-called peak. Therefore, the work technician can make relevant work based on such accurate and reasonable data, which is a superior performance of the acoustic detection system compared to the previous detection equipment.
Through the experiments obtained by the acoustic detection device, the technical staff can also determine the change of the leakage gap and the pressure, which will often affect the variation of the leakage medium flow in the valve. This change will also change the production intensity at the internal leakage gap. These inferred values ​​are often inextricably linked to the normal operation of the pipeline. The results of the analysis can also predict the internal leakage of the valve. The advantages of the acoustic detection system are unmatched by the previous oil pipeline inspection system.
An important science and technology of the acoustic detection system that the relevant personnel should design now is that the acoustic detection system can perform a comparative analysis of the experimental internal leakage rate and the simulated internal leakage rate. This technology is still relatively advanced. The leak rate of the valve measured by this technology is generally based on the pressure difference between the front and the back of the valve and the gap inside the valve. The comparison with the simulated internal leakage rate also has the data of the degree of openness of the valve. Reference, through a certain comparative analysis between the two, so that the possibility of subsequent speculation and analysis of the relevant personnel is greatly reduced. To a certain extent, it avoids unnecessary troubles at work and improves the efficiency of work.
Summarize the analysis of the internal leakage problem of the oil pipeline valve based on the theory of the acoustic detection system. Compared with the comprehensive performance of the previous detection equipment, the designer should develop and practice the acoustic detection system. With the development of the petroleum industry, the pipeline transportation system of petroleum must be continuously improved. The acoustic detection system must have practical value in this respect. This kind of system can improve the network mechanism of China's industrial system, promote and promote the continuous development of oil transportation pipeline construction, and further strengthen China's industrial hard power. Soon, it must be the top priority of national research. It can be said that it has a good development. prospect.
references:
[1]LI Wei,MA Yundong,JIANG Peng,HUANG Yuanhang,MA Yunxiu.Analysis of the problem of internal leakage of oil pipeline valve based on acoustic detection system theory[J].Pressure Vessel,2017,34(12):55-62.
[2] Zhao Dongdong, Ma Lei. Discussion on the selection of oil pipeline valves [J]. Chemical Industry Management, 2014 (27): 146.
[3] Zhang Yu. Research on new methods and key technologies for oil pipeline leakage detection [D]. Tianjin University, 2009.
[Key words] acoustic detection system; analysis of internal leakage status; research CLC number: C912 Document code: A Article ID: 1009-914X(2019)04-0280-01
I. Analysis of the internal leakage of the oil pipeline valve (1) Vibration caused by the pressure wave In the oil transportation process of the oil pipeline system, because the oil delivered is in a liquid state at normal temperature, according to a large number of physical science experiments, this Liquids in the class produce pressure waves in the pipeline. The frequency and wavelength of the generated pressure wave also change irregularly with time. This series of impact phenomena can cause vibration of the valve body and the pipe.
At the same time, the pressure wave changes at any time. An invisible shearing force and friction force are also formed in the valve body and the pipe. As time passes, the shearing force and friction force generate noise in the valve body and the pipe, which leads to the inside of the oil pipeline. vent. If such problems are widespread and cannot be effectively solved in time, they will slowly affect China's oil pipeline system, and to a certain extent, it will bring about a lot of unnecessary troubles.
(2) In the past, the equipment for detecting the leakage of the oil pipeline valve was not advanced. In the past, the detection device for the leakage of the oil pipeline valve was not reasonable enough to fit the acoustic emission parameters of different leakage rates, and there must be some errors of large and small. On the other hand, in the past, in the process of power spectral density analysis of acoustic emission signals, a large amount of relatively accurate data cannot be obtained, which also causes the sensitivity of the device to be greatly reduced. Therefore, the existence of various reasons makes the equipment for detecting the internal leakage of the oil pipeline valve not advanced enough, which leads to the problem that the leakage inside the oil pipeline cannot be well solved. Moreover, domestic research on valve internal leakage is based on the principle of large numbers, and it is rarely practiced in engineering applications.
2. Analysis and research on the internal leakage of the oil pipeline valve based on the theory of acoustic detection system (1) The acoustic detection system can reduce the impact of pressure waves. Valves and pipelines are an important part of the oil pipeline system. The normal operation of valves and pipelines is for the transmission. The transportation of oil systems has an important impact. At present, the acoustic detection system that designers should study can ensure the normal operation of valves and pipelines to the greatest extent. The relevant inspectors can use the low-frequency transmitter of the acoustic detection system to perform normal detection of the oil pipeline during operation, and accordingly estimate accordingly.
The estimated time-domain variation of the relevant acoustic emission parameters is used to characterize the valve internal leakage rate in a specific place. According to the scientific data, the influence of the pressure wave on the oil pipeline can be obtained, and corresponding countermeasures can be taken. On the other hand, the acoustic detection system can also perform acoustic emission positioning on the leakage of the pipeline, and the staff can conduct positioning research in time, which has a general prediction on the impact of pressure wave and shear force, and the staff can Through these data, the pipelines of different parts are repaired and maintained differently, so that the oil pipelines can be properly and timely maintained.
(II) Experimental Procedures of Acoustic Detection System Relevant personnel should conduct a large number of experiments in the laboratory before practice to prove the superiority of the acoustic system. First, a liquid valve internal leak detection device is built in the laboratory, and the acoustic emission detection system of the acoustic detection system is used for inspection and testing. The liquid valve internal leakage device is composed of a plurality of parts, which are composed of an air compressor, a gas booster, a buffer tank, a gate valve and related supporting parts. The volume of the buffer tank can be controlled according to the size of the experiment conducted, and the diameter and height are generally no more than three meters. At the same time, a certain pressure is applied to the buffer tank, which is about 2.2 kPa. Of course, the symbol of the valve must be marked, which will bring great convenience to future experimental work. The valve has a nominal diameter of approximately 150 mm. In addition, the acoustic emission system of the experimental device is composed of a PAC sensor, a preamplifier, and a data acquisition card PCI-8 acoustic emission detector. At the same time, in order to more imitate the real situation, the experimenter can adjust it manually. The reason why it is done so precisely is to completely imitate the situation of the scene.
Then connect the pressurization system to the buffer tank and the valve line, and inject a certain amount of water into it, not too much water, otherwise the effect of the experiment will be affected and the acoustic detection system will be activated. Coupling the device of the acoustic detection system with the pipeline, and also ensuring the stability of the acoustic system connection, it is necessary to look at the various scientifically valid parameters displayed by the instrument.
(3) The experimental conclusion is obtained, which proves that the advanced nature of the acoustic detection system is detected by the acoustic detection equipment. The acoustic detection system can accurately obtain the experimental variation of the phenomenon, which is more accurate than the previous equipment, and the equipment further analyzes the acoustic emission parameters. The relationship between distribution and valve opening. This relationship can be presented in the form of a graphically clearer and more intuitive display on the acoustic detection device. The reality of the test image can be used to derive the ASL value change of the pipeline under different pressure and opening acoustic emission parameters. Figure, the range of variation of the RMS value of the acoustic emission parameters under different opening degrees and pressures, and the variation of the parameters of the acoustic emission signal parameters under different opening degrees and pressures.
As shown in the figure, as the opening degree of the valve does not increase, the various correlation values ​​of the acoustic emission parameters of the valve leakage will increase accordingly, and the trend of the relevant parameter value will increase faster and faster. At a certain level, it will not grow, that is, the so-called peak. Therefore, the work technician can make relevant work based on such accurate and reasonable data, which is a superior performance of the acoustic detection system compared to the previous detection equipment.
Through the experiments obtained by the acoustic detection device, the technical staff can also determine the change of the leakage gap and the pressure, which will often affect the variation of the leakage medium flow in the valve. This change will also change the production intensity at the internal leakage gap. These inferred values ​​are often inextricably linked to the normal operation of the pipeline. The results of the analysis can also predict the internal leakage of the valve. The advantages of the acoustic detection system are unmatched by the previous oil pipeline inspection system.
An important science and technology of the acoustic detection system that the relevant personnel should design now is that the acoustic detection system can perform a comparative analysis of the experimental internal leakage rate and the simulated internal leakage rate. This technology is still relatively advanced. The leak rate of the valve measured by this technology is generally based on the pressure difference between the front and the back of the valve and the gap inside the valve. The comparison with the simulated internal leakage rate also has the data of the degree of openness of the valve. Reference, through a certain comparative analysis between the two, so that the possibility of subsequent speculation and analysis of the relevant personnel is greatly reduced. To a certain extent, it avoids unnecessary troubles at work and improves the efficiency of work.
Summarize the analysis of the internal leakage problem of the oil pipeline valve based on the theory of the acoustic detection system. Compared with the comprehensive performance of the previous detection equipment, the designer should develop and practice the acoustic detection system. With the development of the petroleum industry, the pipeline transportation system of petroleum must be continuously improved. The acoustic detection system must have practical value in this respect. This kind of system can improve the network mechanism of China's industrial system, promote and promote the continuous development of oil transportation pipeline construction, and further strengthen China's industrial hard power. Soon, it must be the top priority of national research. It can be said that it has a good development. prospect.
references:
[1]LI Wei,MA Yundong,JIANG Peng,HUANG Yuanhang,MA Yunxiu.Analysis of the problem of internal leakage of oil pipeline valve based on acoustic detection system theory[J].Pressure Vessel,2017,34(12):55-62.
[2] Zhao Dongdong, Ma Lei. Discussion on the selection of oil pipeline valves [J]. Chemical Industry Management, 2014 (27): 146.
[3] Zhang Yu. Research on new methods and key technologies for oil pipeline leakage detection [D]. Tianjin University, 2009.
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