Gas pipeline leakage on-line monitoring and positioning test device

Abstract

The utility model discloses an online monitoring and positioning test device for gas pipeline leakage. The online monitoring and positioning test device comprises a test pipeline and a data terminal, the test pipeline comprises a supply section, a test section and a discharge section; the supply section comprises a gas source, a pressure regulating device, a first pressure transmitting device and a first flow transmitting device which are sequentially arranged on the test pipeline, and the test section comprises a monitoring device, an observation device and a leakage simulation device which are arranged on the test pipeline. And the discharge section comprises a second pressure transmitting device, a second flow transmitting device and a pressure relief device which are sequentially arranged on the test pipeline. According to the test device, accurate positioning of a simulation leakage device on longitudinal and cross sections of the pipeline can be realized, support is provided for practical application of a monitoring and positioning device for urban gas pipeline leakage, and the on-line monitoring and positioning level of pipeline leakage of fluid such as water, gas, heat, oil and the like can be effectively improved by popularization and application of the test device.

Description

Technical Field

[0001] The utility model belongs to the technical field of signal monitoring and analysis, and relates to an online monitoring test device, in particular to an online monitoring and positioning test device for gas pipeline leakage. Background Art

[0002] With the accelerated advancement of my country's industrialization and the improvement of people's living standards, gas pipeline transportation is widely used in various sectors of the national economy. However, as pipelines age, they often leak due to corrosion, weld defects, vibration and wear, and external damage. This not only affects the normal operation of the pipelines but also poses a significant potential threat to production safety, social stability, soil, environment, and ecology. Currently, when gas pipelines leak, manual detection is often used along the pipeline. This relies heavily on the experience of the leak detector, resulting in low accuracy, time-consuming, and labor-intensive work.

[0003] Currently, online gas pipeline leak detection is primarily based on methods such as negative pressure wave, acoustic wave, flow balance, and distributed fiber optics, with negative pressure wave being the most widely used. This method monitors the changing trends of pressure sensors installed along the gas pipeline to determine if a leak has occurred and issue a location alarm, effectively addressing sudden leaks. However, for small, micropore, multi-point, and slow leaks caused by corrosion, traditional negative pressure wave technology is often unable to detect changes in pressure gradients, resulting in poor detection and location accuracy.

[0004] Therefore, the prior art has defects and needs further improvement and development. Summary of the Invention

[0005] (1) Purpose of the utility model: In order to solve the problems existing in the above-mentioned prior art, the purpose of this utility model is to build a set of test equipment for simulating and testing the corresponding relationship between gas leakage and the pressure and flow in urban gas pipelines, and to verify that the test equipment can achieve accurate positioning of the leakage point in the longitudinal and transverse sections of the urban gas pipelines.

[0006] (2) Technical solution: In order to solve the above technical problems, the present technical solution provides an online monitoring and positioning test device for gas pipeline leakage, including a test pipeline and a data terminal; the test pipeline includes three parts: a supply section, a test section, and a discharge section, which are arranged in sequence according to the gas transmission direction; the supply section includes a gas source, a pressure regulating device, a first pressure transmitting device, and a first flow transmitting device arranged in sequence on the test pipeline of the supply section according to the gas transmission direction; the test section includes a monitoring device, an observation device, and a simulated leakage device arranged on the test pipeline of the test section; the discharge section includes a second pressure transmitting device, a second flow transmitting device, and a pressure relief device arranged in sequence on the test pipeline of the discharge section according to the gas transmission direction.

[0007] Furthermore, the supply section, test section and discharge section are respectively arranged at the upstream, midstream and downstream positions in the gas transmission direction, and the test pipelines between the supply section, test section and discharge section are connected by flanges.

[0008] Furthermore, the gas source is placed on the side of the supply section away from the test section; the pressure regulating device is placed on the side of the gas source close to the test section; the first pressure transmitting device is placed on the side of the pressure regulating device close to the test section; and the first flow transmitting device is placed on the side of the first pressure transmitting device close to the test section.

[0009] Furthermore, the pressure relief device is placed on the side of the discharge section away from the test section; the second flow transmitter is placed on the side of the pressure relief device close to the test section; and the second pressure transmitter is placed on the side of the second flow transmitter close to the test section.

[0010] Furthermore, the monitoring device includes three groups of equipment, each group consisting of a flange, a strain gauge and a strain gauge data transmission line, each group is connected to the test pipe through the flange, and is arranged at both ends and the middle position of the test section; a radial groove is opened on one side of the vertical surface of the flange, and the width and depth of the groove are greater than the width and thickness of the strain gauge and the strain gauge data transmission line; one end of the strain gauge connected to the strain gauge data transmission line is placed in the groove, and the other end of the strain gauge extends into the test pipe and is evenly distributed along the inner circumference of the test pipe; the width of the strain gauge is greater than or equal to the minimum leakage hole diameter, and the distance between the front end of the strain gauge extending into the test pipe and the inner wall of the test pipe is greater than or equal to 0.125 times the inner circumference diameter of the test pipe.

[0011] Furthermore, the simulated leakage device includes two groups of equipment, each group consisting of several leakage holes and leakage hole control valves with different apertures, one group is arranged upstream of the monitoring device close to the supply section side, and the other group is arranged between the monitoring device close to the supply section side and the monitoring device in the middle position.

[0012] Furthermore, the leakage hole is obtained by drilling a hole in the test pipe, inserting a hollow tube into the interior of the test pipe and welding it to the test pipe. A leakage hole control valve is set on each leakage hole to control the opening and closing. The maximum aperture of the leakage hole is less than or equal to 0.2 times the diameter of the test pipe, and the width of the strain gauge is greater than or equal to the minimum aperture of the leakage hole.

[0013] Furthermore, the observation device includes three groups of equipment, each group consists of an endoscope and an endoscope, and each group is respectively arranged on the side of the three monitoring devices close to the supply section. The group of observation devices close to the supply section is located between the simulated leakage device close to the supply section and the monitoring device close to the supply section; the endoscope is a drilled hole in the test pipe, which passes through the side wall of the test pipe, and the diameter of the endoscope is 0.2 times the endoscope lens.

[0014] Furthermore, the gas source, pressure regulating device, first pressure transmitting device, first flow transmitting device, monitoring device, observation device, simulated leakage device, second pressure transmitting device, second flow transmitting device and pressure relief device are all installed on the test pipeline.

[0015] Furthermore, the test pipeline between the test section, the supply section and the discharge section of the test pipeline is a straight pipeline with the same material and the same diameter.

[0016] Furthermore, the data terminal is connected to the first pressure transmitting device, the first flow transmitting device, the second pressure transmitting device, the second flow transmitting device and the monitoring device respectively.

[0017] (3) Beneficial effects: The monitoring and positioning test device of the utility model can verify that the test device can accurately locate the leakage point on the longitudinal and transverse sections of the pipeline through simulated leakage tests under different preset working conditions, providing support for the practical application of gas pipeline leakage monitoring and positioning devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the utility model gas pipeline leakage online monitoring and positioning test device;

[0019] Figure 2 This is a schematic diagram of the elevation structure of the monitoring device of the utility model;

[0020] Figure 3 This is a schematic diagram of the lower half of the monitoring device of the utility model from a top view;

[0021] Figure 4 This is a schematic diagram of the leakage hole of the utility model.

[0022] Figure markings: 1-gas source; 2-pressure regulating device; 3-first pressure transmitting device; 4-first flow transmitting device; 51-first simulated leakage device; 52-second simulated leakage device; 61-first observation device; 62-second observation device; 63-third observation device; 71-first monitoring device; 72-second monitoring device; 73-third monitoring device; 8-second pressure transmitting device; 9-second flow transmitting device; 15-pressure relief device; 16-analysis and processing unit; 17-display unit; 18-flange; 19-strain gauge data transmission line; 20-flange hole; 21-groove; 22-strain gauge; 23-leakage hole; 24-leakage hole control valve; 25-test pipeline; A1-supply section, A2-test section, A3-discharge section. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with preferred embodiments. More details are elaborated in the following description to facilitate a full understanding of the present invention. However, the present invention can obviously be implemented in a variety of other ways different from the description. Those skilled in the art can make similar generalizations and deductions based on actual application situations without violating the connotation of the present invention. Therefore, the scope of protection of the present invention should not be limited by the content of this specific embodiment.

[0024] The accompanying drawings are schematic diagrams of embodiments of the present invention. It should be noted that the drawings are merely examples and are not drawn to scale, and should not be used to limit the actual scope of protection claimed for the present invention.

[0025] A gas pipeline leakage online monitoring and positioning test device, including a test pipeline and a data terminal; Figure 1 As shown, the test pipeline includes three parts: supply section A1, test section A2, and discharge section A3, which are used to transport gas and provide a data source for the data terminal; the data terminal includes an analysis and processing unit 16 and a display unit 17, which are used to collect real-time pressure in the test pipeline, analyze flow rate fluctuations and display them.

[0026] The supply section A1 is located upstream of the test apparatus and includes a gas source 1, a pressure regulating device 2, a first pressure transmitter 3, and a first flow transmitter 4. The gas source 1 is located at one end of the supply section A1, away from the test section A2. It blocks one end of the test pipeline 25 and provides test gas to the test pipeline 25. Preferably, the gas source 1 uses inert industrial gas or compressed air, supplied via an industrial gas cylinder or air compressor. The pressure regulating device 2 is located near the test section A2 and regulates the pressure of the test gas provided by the gas source 1 to a predetermined test pressure within the test pipeline 25. The first pressure transmitter 3 is located near the test section A2 of the pressure regulating device 2 and is connected to the analysis and processing unit 16 via an electrical circuit. The first flow transmitter 4 is located near the test section A2 of the pressure regulating device 2 and is connected to the analysis and processing unit 16 via an electrical circuit. The first pressure transmitter 3 and the first flow transmitter 4 monitor the gas pressure, flow rate, and flow velocity data within the supply section A1 online and transmit the collected data to the analysis and processing unit 16.

[0027] The test section A2 is placed in the midstream of the test device and includes a monitoring device, an observation device and a simulated leakage device.

[0028] like Figure 1-3 As shown, the monitoring device includes three sets of equipment: a first monitoring device 71, a second monitoring device 72, and a third monitoring device 73. Each set consists of a flange 18, a strain gauge 22, and a strain gauge data transmission line 19. Each set is connected to the test pipeline 25 via the flange. The first monitoring device 71 is located on the side of the test section A2 near the supply section A1, the second monitoring device 72 is located in the middle of the test section A2, and the third monitoring device 73 is located on the side of the test section A2 near the discharge section A3. The monitoring devices are used to collect deformation data from the strain gauges 22 and the negative pressure waves within the test pipeline 25. The strain gauge data transmission line 19 is connected to the strain gauges 22 at one end and to the analysis and processing unit 16 at the other end. The strain gauges 22 selected for each set of the monitoring device have the same specifications and dimensions. The width of the selected strain gauges 22 is larger than the minimum diameter of the leak hole to cover the cross-section of the negative pressure wave propagation path caused by the leaked gas. This is used to determine the approximate orientation of the leak hole within the pipeline cross section to reduce lateral effects. The length of the strain gauge 22 should be selected so that the end of the strain gauge 22 extending into the test pipe is located within the average flow velocity of the fully developed fluid in the test pipe. This allows for detection of the average cross-sectional flow velocity at the monitoring point in the test pipe after a leak occurs, while minimizing the impact on fluid flow. Preferably, the width of the strain gauge 22 is greater than or equal to the minimum leak hole diameter of the simulated leak device on the test pipe 25, and the length of the strain gauge 22 is greater than or equal to 0.125 times the inner diameter of the test pipe 25.

[0029] The flange 18 includes a flange hole 20 and a groove 21. The flange 18 has the same specifications as the flange used to connect the monitoring device on the test pipe 25. Based on the data and dimensions of the installed strain gauge, a number of radial grooves 21 are cut through one side of the flange 18's facade. These grooves 21 are evenly distributed throughout the flange 18, with a depth and width greater than the width and thickness of the strain gauge and the strain gauge data transmission line. One end of the strain gauge 22, connected to the strain gauge data transmission line 19, is placed in the groove 21 and affixed with insulating adhesive, filling the groove 21 completely. The other end of the strain gauge 22 extends into the test pipe 25, evenly distributed along the inner circumference of the test pipe 25.

[0030] like Figure 4 As shown, the simulated leakage device includes two sets of equipment, namely a first simulated leakage device 51 and a second simulated leakage device 52. Each set consists of several leak holes 23 of different apertures and leak hole control valves 24. Four leak holes 23 and leak hole control valves 24 are used as an example for description. The first simulated leakage device 51 is set on the side of the first monitoring device 71 close to the supply section A1, and the second simulated leakage device 52 is set between the first monitoring device 71 and the second monitoring device 72. It is used to affect the pressure and flow rate in the test pipe 25 by opening and closing to simulate leakage. The leak holes 23 are drilled in the test pipe 25, hollow tubes are inserted into the test pipe, and then welded to the test pipe 25. A leak hole control valve 24 is set on each leak hole 23 to control opening and closing. The maximum aperture of the leak hole 23 is less than or equal to 0.2 times the diameter of the test pipe 25, and the width of the strain gauge 22 is greater than or equal to the minimum aperture of the leak hole 23.

[0031] The observation device comprises three sets of equipment: a first observation device 61, a second observation device 62, and a third observation device 63. Each set consists of an endoscope and an endoscope. The first observation device 61 is located between the first simulated leak device 51 and the first monitoring device 71. The second observation device 62 is located on the side of the second monitoring device 72 closer to the supply section A1. The third observation device 63 is located on the side of the third monitoring device 73 closer to the supply section A1. The endoscope is a drilled hole in the test pipe 25 that penetrates the sidewall of the test pipe 25. The diameter of the endoscope is 0.2 times the diameter of the endoscope lens, allowing the selected endoscope to be smoothly inserted into the pipe to observe the status of the strain gauge.

[0032] The discharge section A3 is placed at the downstream position of the test device, and includes a second pressure transmitter 8, a second flow transmitter 9 and a pressure relief device 15. The pressure relief device 15 is placed at one end of the discharge section A3, away from the side of the test section A2, to block one end of the test pipe 25, and by adjusting the opening of the pressure relief device 15, cooperates with the pressure regulating device 2 of the supply section A1 to make the predetermined test pressure and flow rate values ​​in the test pipe 25. The pressure relief device 15 can be an adjustable pressure relief valve, which is not specifically limited here. The second flow transmitter 9 is placed on the side of the pressure relief device 15 close to the test section A2, and is connected to the analysis and processing unit 16 through a circuit; the second pressure transmitter 8 is placed on the side of the second flow transmitter 9 close to the test section A2, and is connected to the analysis and processing unit 16 through a circuit. The second pressure transmitter 8 and the second flow transmitter 9 monitor the gas pressure, flow and flow rate data in the discharge section A3 online.

[0033] The data terminal includes an analysis and processing unit 16 and a display unit 17. The data terminal utilizes an industrial-grade computer. One end of the analysis and processing unit 16 is connected to the first pressure transmitter 3, the first flow transmitter 4, the second pressure transmitter 8, the second flow transmitter 9, and the monitoring device, and the other end is connected to the display unit 17. The analysis and processing unit 16 includes a data acquisition module, a serial port server, data acquisition software, and a data processing module. This unit collects and analyzes data monitored in the test pipeline 25, locating the leak point in the longitudinal and transverse sections of the pipeline. The display unit 17 displays the processing results of the analysis and processing unit 16 in real time.

[0034] When the first simulated leakage device 51 is turned on, the time interval Δt1 of the negative pressure wave is detected by the second monitoring device 72 and the third monitoring device 73, as well as the preset distance s between the two, and the propagation speed of the negative pressure wave v=s / Δt1 is roughly obtained. When the second simulated leakage device 52 is turned on, the difference Δt2 between the time intervals of the negative pressure wave detected by the first monitoring device 71 and the second monitoring device 72 is used to determine the approximate position of the leak point in the longitudinal section of the pipeline s1=vΔt2. s1 is compared with the position s' of the preset activated simulated leakage device. If the difference between the two is within the error, the positioning formula is obtained:

[0035]

[0036] Among them, Δt1 represents the time interval between the second monitoring device 72 and the third monitoring device 73 detecting the negative pressure wave; s represents the preset distance between the second monitoring device 72 and the third monitoring device 73; v represents the propagation speed of the negative pressure wave; Δt2 represents the difference in time intervals between the first monitoring device 71 and the second monitoring device 72 successively detecting the negative pressure wave; s1 represents the approximate position of the leakage point in the longitudinal section of the pipeline; s' represents the position of the opened preset simulated leakage device.

[0037] It should be noted that the analysis and processing process of the analysis and processing unit is described in Patent No. CN 113236985 B, which belongs to the prior art and is not an improved technical feature of the present utility model, and will not be described in detail here.

[0038] The test pipes 25 between the supply section A1, the test section A2 and the discharge section A3 are connected by flanges, and the test pipes 25 between the sections are straight pipes with the same material and the same diameter.

[0039] The gas source 1 , pressure regulating device 2 , first pressure transmitting device 3 , first flow transmitting device 4 , monitoring device, observation device, simulated leakage device, second pressure transmitting device 8 , second flow transmitting device 9 and pressure relief device 15 are all installed on the test pipe 25 .

[0040] The pressure regulating device 2, the first pressure transmitting device 3, the first flow transmitting device 4, the second pressure transmitting device 8 and the second flow transmitting device 9 are determined according to the outlet pressure of the gas source 1 and the required test pressure and flow rate conditions. Preferably, large-range and high-precision equipment are selected.

[0041] Before installing the monitoring device, pressure regulating device 2, first pressure transmitting device 3, first flow transmitting device 4, second pressure transmitting device 8, and second flow transmitting device 9, the test pipe 25 should be purged. After the test device is installed, an air tightness and strength test should be performed.

[0042] Specifically, the test can be generally divided into two situations: static pressure and dynamic pressure. The static pressure test is to open the gas source 1 through the pressure regulating device 2 until the test pipe 25 reaches the predetermined test pressure, close the gas source 1, and open the leakage hole control valve 24 on different simulated leakage devices to simulate leakage. The dynamic pressure test is to open the gas source 1 through the pressure regulating device 2 until the test pipe 25 reaches the predetermined test pressure, open the pressure relief device 15 to a certain opening, so that the gas flow rate in the test pipe 25 reaches a certain stable state, and open the leakage hole control valve 24 on different simulated leakage devices to simulate leakage.

[0043] Each working condition was repeated more than three times to ensure the accuracy and repeatability of the test data.

[0044] After each or several tests, the integrity of each strain gauge of the monitoring device should be observed through the observation device using an endoscope.

[0045] During each test, the deformation data of each set of strain gauges of the monitoring device, as well as the monitoring data of the first pressure transmitter 3, the first flow transmitter 4, the second pressure transmitter 8, and the second flow transmitter 9 are collected and transmitted to the data terminal for analysis and storage, and a real-time waveform is displayed.

[0046] To sum up, the utility model proposes an online monitoring and positioning test device for gas pipeline leakage. Through simulated leakage tests under different preset working conditions, it can be verified that the test device can achieve accurate positioning of the leakage point on the longitudinal and cross-sections of the pipeline, providing support for the practical application of the gas pipeline leakage monitoring and positioning device. Its promotion and application will effectively improve the level of online monitoring and positioning of leakage in fluid pipelines such as water, gas, heat, and oil.

[0047] The above description is an explanation of the preferred embodiments of the present invention, which can help those skilled in the art to more fully understand the technical solutions of the present invention. However, these embodiments are merely illustrative, and it cannot be assumed that the specific implementation methods of the present invention are limited to the description of these embodiments. For those skilled in the art of the present invention, without departing from the concept of the present invention, they can make a number of simple deductions and transformations, which should be considered to fall within the scope of protection of the present invention.

Claims

1. A gas pipeline leakage online monitoring and positioning test device, characterized in that: The device comprises a test pipeline and a data terminal; the test pipeline comprises a supply section, a test section, and a discharge section, which are sequentially arranged along the direction of gas delivery; the supply section comprises a gas source, a pressure regulating device, a first pressure transmitter, and a first flow transmitter, which are sequentially arranged along the direction of gas delivery on the test pipeline of the supply section; the test section comprises a monitoring device, an observation device, and a simulated leakage device, which are arranged along the test pipeline of the test section; and the discharge section comprises a second pressure transmitter, a second flow transmitter, and a pressure relief device, which are sequentially arranged along the direction of gas delivery on the test pipeline of the discharge section. The supply section, test section and discharge section are respectively arranged at the upstream, midstream and downstream positions in the gas transmission direction, and the test pipelines between the supply section, test section and discharge section are connected by flanges.

2. A gas pipeline leakage online monitoring and positioning test device according to claim 1, characterized in that: The gas source is placed on the side of the supply section away from the test section; the pressure regulating device is placed on the side of the gas source close to the test section; the first pressure transmitting device is placed on the side of the pressure regulating device close to the test section; and the first flow transmitting device is placed on the side of the first pressure transmitting device close to the test section.

3. The gas pipeline leakage online monitoring and positioning test device according to claim 1 is characterized by: The pressure relief device is placed on the side of the discharge section away from the test section; the second flow transmitter is placed on the side of the pressure relief device close to the test section; the second pressure transmitter is placed on the side of the second flow transmitter close to the test section.

4. The gas pipeline leakage online monitoring and positioning test device according to claim 1 is characterized by: The monitoring device includes three groups of equipment, each group consists of a flange, a strain gauge and a strain gauge data transmission line. Each group is connected to the test pipe through the flange and is arranged at both ends and the middle position of the test section; a radial groove is opened on one side of the vertical surface of the flange, and the width and depth of the groove are greater than the width and thickness of the strain gauge and the strain gauge data transmission line; one end of the strain gauge connected to the strain gauge data transmission line is placed in the groove, and the other end of the strain gauge extends into the test pipe and is evenly distributed along the inner circumference of the test pipe; the width of the strain gauge is greater than or equal to the minimum leakage hole diameter, and the distance between the front end of the strain gauge extending into the test pipe and the inner wall of the test pipe is greater than or equal to 0.125 times the inner diameter of the test pipe.

5. The gas pipeline leakage online monitoring and positioning test device according to claim 1 is characterized by: The simulated leakage device includes two groups of equipment, each group consisting of several leakage holes with different apertures and leakage hole control valves. One group is arranged upstream of the monitoring device close to the supply section side, and the other group is arranged between the monitoring device close to the supply section side and the monitoring device in the middle position.

6. The gas pipeline leakage online monitoring and positioning test device according to claim 5, characterized in that: The leakage hole is formed by drilling a hole in the test pipe, inserting a hollow tube into the interior of the test pipe and welding the hole to the test pipe. A leakage hole control valve is provided on each leakage hole to control the opening and closing. The maximum aperture of the leakage hole is less than or equal to 0.2 times the diameter of the test pipe, and the width of the strain gauge is greater than or equal to the minimum aperture of the leakage hole.

7. The gas pipeline leakage online monitoring and positioning test device according to claim 1 is characterized by: The observation device includes three groups of equipment, each group consists of an endoscope and an endoscope, and each group is respectively arranged on the side of the three monitoring devices close to the supply section. The group of observation devices close to the supply section is located between the simulated leakage device close to the supply section and the monitoring device close to the supply section; the endoscope is a drilled hole in the test pipe, which passes through the side wall of the test pipe, and the diameter of the endoscope is 0.2 times the endoscope lens.

8. The gas pipeline leakage online monitoring and positioning test device according to claim 1 is characterized by: The gas source, pressure regulating device, first pressure transmitting device, first flow transmitting device, monitoring device, observation device, simulated leakage device, second pressure transmitting device, second flow transmitting device and pressure relief device are all installed on the test pipeline.

9. The gas pipeline leakage online monitoring and positioning test device according to claim 1, characterized in that: The test pipelines between the test section, the supply section and the discharge section of the test pipeline are straight pipelines with the same material and the same diameter.

10. The gas pipeline leakage online monitoring and positioning test device according to claim 1, characterized in that: The data terminal is connected to the first pressure transmitting device, the first flow transmitting device, the second pressure transmitting device, the second flow transmitting device and the monitoring device respectively.

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