Buried pipeline leakage test device

Abstract

The utility model discloses a buried pipeline leakage test device, which belongs to the technical field of pipeline leakage monitoring and comprises a leakage simulation device and a leakage monitoring device. The leakage simulation device comprises a leakage simulation pipeline, one end of the leakage simulation pipeline is provided with a medium inlet, the middle of the leakage simulation pipeline is provided with a leakage opening, the other end of the leakage simulation pipeline is provided with a sliding opening, the sliding opening is in sealed sliding connection with a sliding pipe, one end of the sliding pipe is fixedly sleeved with a piston head, the piston head is located in the leakage simulation pipeline, and the other end of the sliding pipe is provided with a medium outlet. The medium outlet is located outside the leakage simulation pipeline, and a control valve is arranged on the medium outlet; the leakage monitoring device comprises a temperature sensing optical fiber and a vibration sensing optical fiber, and the temperature sensing optical fiber and the vibration sensing optical fiber are laid above the leakage simulation pipeline with height difference. Medium leakage of a buried pipeline can be simulated through the leakage simulation pipeline, temperature and vibration at a leakage opening are monitored through the temperature sensing optical fiber and the vibration sensing optical fiber, and a data basis can be provided for pipeline leakage research.

Description

Technical Field

[0001] This utility model relates to the field of pipeline leakage monitoring technology, and in particular to a buried pipeline leakage testing device. Background Technology

[0002] As a core facility for the transmission of urban gas, oil, and other energy sources, the safe operation of buried natural gas pipelines is directly related to public safety and environmental stability. However, leaks caused by factors such as corrosion, damage from third-party construction, or material aging occur frequently, potentially leading to serious consequences such as explosions and environmental pollution. In-depth research into real-time fault diagnosis technology for buried pipeline leaks can quickly identify and accurately locate leak points, optimize emergency response, and maximize the safe operation of buried pipeline networks.

[0003] Based on this, the utility model of a buried pipeline leakage test device is of great significance for the research on the leakage mechanism of buried pipelines and the development of prevention and control technologies. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned technical problems and provide a buried pipeline leakage test device. By simulating the leakage of a buried pipeline, the device can simulate the leakage of media in the buried pipeline. Temperature sensing fiber (DTS) and vibration sensing fiber (DAS) are used to monitor the temperature and vibration at the leakage point, providing a data foundation for pipeline leakage research. This is of great significance for the research on the leakage mechanism of buried pipelines and the development of prevention and control technologies.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention discloses a buried pipeline leakage test device, including a leakage simulation device and a leakage monitoring device;

[0006] The leakage simulation device includes a leakage simulation pipeline for horizontal burial in the soil. One end of the leakage simulation pipeline is provided with a medium inlet for connection to a medium supply device. The middle part of the leakage simulation pipeline is provided with an upward-facing leakage port. The other end of the leakage simulation pipeline is provided with a sliding port, which is slidably and sealingly connected to a sliding tube. One end of the sliding tube is fitted with and fixed with a piston head, which is located inside the leakage simulation pipeline and can close the leakage port on its movement path. The other end of the sliding tube is provided with a medium outlet, which is located outside the leakage simulation pipeline, and a control valve is provided on the medium outlet.

[0007] The leakage monitoring device includes a temperature sensing fiber and a vibration sensing fiber. The temperature sensing fiber and the vibration sensing fiber are laid above the leakage simulation pipe with a height difference. The temperature sensing fiber and the vibration sensing fiber extend along the axial direction of the leakage simulation pipe. The projections of the temperature sensing fiber and the vibration sensing fiber on the leakage simulation pipe both pass through the sliding port.

[0008] Preferably, the leakage simulation pipeline includes a first pipe section, a second pipe section, and a third pipe section arranged sequentially along the axial direction. The second pipe section is detachably connected to the first pipe section and the third pipe section. The leakage outlet is located on the second pipe section, the medium inlet is located on the first pipe section, and the sliding port is located on the third pipe section.

[0009] Preferably, it includes multiple second pipe sections, each with a different leak point.

[0010] Preferably, the first pipe section, the second pipe section, and the third pipe section are connected by flange bolts.

[0011] Preferably, the device further includes a medium supply device, which includes a medium storage device and a delivery pipe. The medium storage device has a medium outlet, and the medium outlet has a regulating valve. One end of the delivery pipe is connected to the regulating valve, and the other end of the delivery pipe is connected to the medium inlet.

[0012] Preferably, the medium storage device is a gas cylinder or a water tank.

[0013] Preferably, the delivery pipe is a delivery hose.

[0014] Preferably, the diameters of the medium inlet and the sliding port are smaller than those of the leakage simulation pipe.

[0015] Preferably, the device further includes an optical fiber temperature demodulator and an optical fiber vibration demodulator, wherein the temperature sensing optical fiber is electrically connected to the optical fiber temperature demodulator, and the vibration sensing optical fiber is electrically connected to the optical fiber vibration demodulator.

[0016] Preferably, the burial depth of the simulated leakage pipe is not less than 0.8m, and the height difference between the temperature sensing fiber and the vibration sensing fiber and the simulated leakage pipe is not greater than 0.1m.

[0017] The present invention achieves the following technical advantages over the prior art:

[0018] In this invention, the opening and closing of the leak outlet can be achieved by using a leak simulation pipeline in conjunction with the sliding of a sliding tube, thus simulating media leakage. Temperature and vibration at the leak outlet are monitored by temperature sensing fiber (DTS) and vibration sensing fiber (DAS). Qualitative and quantitative identification of the leak is achieved by utilizing temperature differences and vibration signals, providing a data foundation for pipeline leakage research. This is of great significance for the research on the leakage mechanism of buried pipelines and the development of prevention and control technologies.

[0019] Compared with the prior art, the other technical solutions of this utility model have also achieved the following technical effects:

[0020] In this invention, the simulated leakage pipeline is divided into three detachable pipe sections (first pipe section, second pipe section, and third pipe section). By replacing the second pipe section with a leakage port of different shape and / or size, it can adapt to the test requirements of various leakage port types and meet the requirements of buried pipeline leakage test under variable parameter conditions. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained by analyzing these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the buried pipeline leakage test device in an embodiment of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 100. Medium storage device; 101. Control valve; 102. Delivery pipe;

[0025] 201. First pipe section; 202. Second pipe section; 203. Third pipe section; 204. Medium inlet; 205. Flange; 206. Sealing plate; 207. Limiting plate;

[0026] 301. Sliding tube; 302. Piston head; 303. Control valve. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments analyzed and obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] The purpose of this invention is to provide a buried pipeline leakage testing device to solve the problems existing in the prior art. By simulating the leakage of a pipeline and the sliding of a sliding tube, the opening and closing of the leak can be realized, thus simulating the leakage of the medium. Temperature sensing fiber (DTS) and vibration sensing fiber (DAS) are used to monitor the temperature and vibration at the leak point. The qualitative and quantitative identification of the leak is realized by using temperature differences and vibration signals, providing a data foundation for pipeline leakage research.

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown in the figure, this embodiment provides a buried pipeline leakage test device, including a leakage simulation device and a leakage monitoring device.

[0031] The leakage simulation device includes a leakage simulation pipeline, which is horizontally buried in the soil. One end of the leakage simulation pipeline has a medium inlet 204, which is used to connect to a medium supply device. A leak outlet is located in the middle of the leakage simulation pipeline, and this outlet must face upwards when the pipeline is buried. The other end of the leakage simulation pipeline has a sliding port, to which a sliding tube 301 is slidably and sealingly connected. A piston head 302 is fitted and fixedly connected to one end of the sliding tube 301. The piston head 302 is located inside the leakage simulation pipeline and can seal the leak outlet during its movement. The other end of the sliding tube 301 has a medium outlet located outside the leakage simulation pipeline, and a control valve 303 is installed at the medium outlet.

[0032] The leak monitoring device includes a temperature sensing fiber (DTS) and a vibration sensing fiber (DAS). Both the temperature sensing fiber and the vibration sensing fiber are laid above the leak simulation pipe. There is a height difference between the temperature sensing fiber and the leak simulation pipe. The temperature sensing fiber and the vibration sensing fiber extend along the axial direction of the leak simulation pipe. The projections of the temperature sensing fiber and the vibration sensing fiber on the leak simulation pipe both pass through the sliding port.

[0033] Working principle:

[0034] First, connect the medium inlet 204 of the leakage simulation pipeline to the medium supply device, adjust the position of the sliding tube 301 to ensure that the piston head 302 blocks the leakage port, and close the control valve 303;

[0035] Then, a test trench is dug on the test site, and the leakage simulation pipeline is placed horizontally in the trench with the leakage outlet facing upwards. Soil is backfilled, and the leakage simulation pipeline is buried in the test trench. During the burial process, at least one temperature sensing fiber and at least one vibration sensing fiber are laid at a preset height above the surface of the leakage simulation pipeline. After the backfill soil is completed, it is covered with soft soil and fine sand. During the burial process, the part of the medium inlet 204 and the sliding tube 301 extending out of the leakage simulation pipeline must be exposed so that the sliding tube 301 can be pulled out later.

[0036] Then, slowly release the medium (gas or liquid, volatile liquid) to fill the entire leak simulation pipeline and reach the test pressure. Then stop releasing the medium and slowly pull the sliding tube 301 until the leak port is fully open and in a leaking (liquid) state. When pulling the sliding tube 301, pull the piston head 302 all the way to the sliding port.

[0037] Then, after the test pressure of the simulated leakage pipeline reaches a stable state, gas leakage information (temperature and vibration data) is collected using temperature sensing fiber and vibration sensing fiber. The qualitative and quantitative identification of the leakage is achieved by using temperature differences and vibration signals, providing a data basis for pipeline leakage research.

[0038] Finally, after the test is completed, open control valve 303 to release the residual medium, and the next test can be carried out, or the entire buried pipeline leakage test device can be recovered.

[0039] In one embodiment, the leak simulation pipeline includes a first pipe section 201, a second pipe section 202, and a third pipe section 203 arranged sequentially along the axial direction. The second pipe section 202 is detachably connected to the first pipe section 201 and the third pipe section 203. The leak outlet is located on the second pipe section 202, the medium inlet 204 is located on the first pipe section 201, and the sliding port is located on the third pipe section 203. Making the leak simulation pipeline detachable for the first pipe section 201, the second pipe section 202, and the third pipe section 203 is convenient for installing the piston head 302 on the sliding pipe 301, and also allows for the replacement of the second pipe section 202 with leak outlets of different sizes and / or shapes.

[0040] In one embodiment, the system includes multiple second pipe sections 202, each with a different leak point. By prefabricating second pipe sections 202 with different leak points, it is possible to replace them at the test site. Different leak points refer to different sizes, different shapes, or both. Different shapes include elongated, circular, cracked, etc.

[0041] In one embodiment, the first pipe section 201, the second pipe section 202, and the third pipe section 203 are bolted together via flanges 205, achieving a detachable connection. Specifically, a medium inlet 204 is provided at one end of the first pipe section 201, and a flange 205 is provided at the other end. Then, a flange 205 is provided at each end of the second pipe section 202. A sliding port is provided at one end of the third pipe section 203, and a flange 205 is provided at the other end. During installation, the flanges 205 at both ends of the second pipe section 202 are aligned with the flanges 205 of the first pipe section 201 and the third pipe section 203, respectively. Bolts are then inserted into the flange holes of the flanges 205 and tightened with nuts to achieve the bolted connection.

[0042] In one embodiment, a medium supply device is also included. The medium supply device comprises a medium storage device 100 and a delivery pipe 102. The medium storage device 100 has a medium outlet, and a regulating valve 101 is provided at the medium outlet. One end of the delivery pipe 102 is connected to the regulating valve 101, and the other end of the delivery pipe 102 is connected to the medium inlet 204. The regulating valve 101 allows for the adjustment of the medium supply and its rate. During installation, the medium supply device is not actually buried; only the leak simulation pipeline needs to be installed.

[0043] In one embodiment, the medium storage device 100 is a gas cylinder or a water tank. The gas cylinder is a pressurized gas cylinder. The water tank stores volatile liquids.

[0044] In one embodiment, the delivery pipe 102 is a delivery hose.

[0045] In one embodiment, the diameters of both the medium inlet 204 and the sliding port are smaller than those of the leakage simulation pipeline. Specifically, the medium inlet 204 can be formed as follows: one end of the leakage simulation pipeline is sealed with a sealing plate 206, which has a pre-drilled mounting hole. An inlet pipe, with a diameter smaller than the leakage simulation pipeline, is then installed at the mounting hole and is coaxially aligned with the leakage simulation pipeline; this inlet pipe serves as the medium inlet 204. The sliding port can be formed as follows: the other end of the leakage simulation pipeline is sealed with a limiting plate 207, which has a pre-drilled hole serving as the sliding hole. The sliding hole is coaxially aligned with the leakage simulation pipeline.

[0046] In one embodiment, the system further includes a fiber optic temperature demodulator and a fiber optic vibration demodulator. The temperature-sensing fiber optic cable is electrically connected to the fiber optic temperature demodulator, which receives and analyzes the temperature signal monitored by the temperature-sensing fiber optic cable. The vibration-sensing fiber optic cable is electrically connected to the fiber optic vibration demodulator, which receives and analyzes the vibration signal monitored by the vibration-sensing fiber optic cable. Using both temperature-sensing and vibration-sensing fibers for monitoring is suitable for monitoring long-distance buried gas pipelines because they can extend along the length of the pipeline.

[0047] In one embodiment, the temperature sensing fiber is a distributed temperature sensing fiber, and the vibration sensing fiber is a distributed vibration sensing fiber.

[0048] In one embodiment, the burial depth of the leak simulation pipe is not less than 0.8m, and the height difference between the temperature sensing fiber and the vibration sensing fiber and the leak simulation pipe is not greater than 0.1m.

[0049] In one embodiment, the piston head 302 is a rubber piston head.

[0050] In one embodiment, a method for using a buried pipeline leakage testing device is provided:

[0051] Step S1, Device connection:

[0052] The first pipe section 201, the second pipe section 202 and the third pipe section 203 are connected by flange 205 and bolts to form a leakage simulation pipeline. The piston head 302 blocks the leakage port of the second pipe section 202, the control valve 303 is closed, the medium inlet 204 is connected to the delivery pipe 102, the regulating valve 101 is closed, and the entire leakage simulation pipeline is in a closed state.

[0053] Step S2, Experiment Preparation:

[0054] A test trench was dug on the test site. The test trench was 1m wide, 2m long, and more than 0.8m deep. The leakage simulation pipeline was buried horizontally in the test trench and covered with soft soil and fine sand. The soil layer above the leakage simulation pipeline was more than 0.8m thick. The sliding pipe 301 end where the medium inlet 204 and control valve 303 are located was exposed. A temperature sensing fiber and a vibration sensing fiber were buried 0.1m above the leakage simulation pipeline.

[0055] Step S3, Leakage Detection:

[0056] Open the regulating valve 101, adjust the opening of the regulating valve 101, slowly release the medium, fill the entire leakage simulation pipeline and reach the test pressure, then slowly pull the sliding tube 301 to the limit plate 207 (the sliding tube 301 is limited by the limit plate 207 and will not continue to move, which helps to ensure the stability of the overall test pressure), so that the leakage port is fully open and in a leaking (liquid) state.

[0057] Step S4: Data Analysis

[0058] Once the test pressure of the overall leakage simulation pipeline reaches a stable state, gas leakage information is detected using temperature sensing fiber and vibration sensing fiber. A fiber optic temperature demodulator and a fiber optic vibration demodulator are used to collect the corresponding temperature and vibration data in real time. The qualitative and quantitative identification of the leakage is achieved by using temperature differences and vibration signals, providing a data foundation for pipeline leakage research.

[0059] This buried pipeline leakage testing device is simple to manufacture, small in size, lightweight, and low in cost. It is highly operable for on-site pipeline testing and is suitable for different test media and different pipeline diameters. The three-section pipeline design can meet the testing needs of various types of leakage points.

[0060] This utility model uses specific examples to illustrate its principles and implementation methods. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the idea of ​​this utility model. In summary, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A buried pipeline leakage testing device, characterized in that, Includes leak simulation devices and leak monitoring devices; The leakage simulation device includes a leakage simulation pipeline for horizontal burial in the soil. One end of the leakage simulation pipeline is provided with a medium inlet for connection to a medium supply device. The middle part of the leakage simulation pipeline is provided with an upward-facing leakage port. The other end of the leakage simulation pipeline is provided with a sliding port, which is slidably and sealingly connected to a sliding tube. One end of the sliding tube is fitted with and fixed with a piston head, which is located inside the leakage simulation pipeline and can close the leakage port on its movement path. The other end of the sliding tube is provided with a medium outlet, which is located outside the leakage simulation pipeline, and a control valve is provided on the medium outlet. The leakage monitoring device includes a temperature sensing fiber and a vibration sensing fiber. The temperature sensing fiber and the vibration sensing fiber are laid above the leakage simulation pipe with a height difference. The temperature sensing fiber and the vibration sensing fiber extend along the axial direction of the leakage simulation pipe. The projections of the temperature sensing fiber and the vibration sensing fiber on the leakage simulation pipe both pass through the sliding port.

2. The buried pipeline leakage testing device according to claim 1, characterized in that, The simulated leakage pipeline includes a first pipe section, a second pipe section, and a third pipe section arranged sequentially along the axial direction. The second pipe section is detachably connected to the first pipe section and the third pipe section. The leakage outlet is located on the second pipe section, the medium inlet is located on the first pipe section, and the sliding port is located on the third pipe section.

3. The buried pipeline leakage testing device according to claim 2, characterized in that, It includes multiple second pipe sections, each with a different leak point.

4. The buried pipeline leakage testing device according to claim 2 or 3, characterized in that, The first pipe section, the second pipe section, and the third pipe section are connected by flange bolts.

5. The buried pipeline leakage testing device according to claim 1, characterized in that, It also includes a media supply device, which includes a media storage device and a delivery pipe. The media storage device is provided with a media outlet, and a regulating valve is provided on the media outlet. One end of the delivery pipe is connected to the regulating valve, and the other end of the delivery pipe is connected to the media inlet.

6. The buried pipeline leakage testing device according to claim 5, characterized in that, The medium storage device is a gas cylinder or a water tank.

7. The buried pipeline leakage testing device according to claim 5, characterized in that, The delivery pipe is a delivery hose.

8. The buried pipeline leakage testing device according to claim 1, characterized in that, The diameters of the medium inlet and the sliding port are smaller than those of the leak simulation pipe.

9. The buried pipeline leakage testing device according to claim 1, characterized in that, It also includes an optical fiber temperature demodulator and an optical fiber vibration demodulator, wherein the temperature sensing optical fiber is electrically connected to the optical fiber temperature demodulator, and the vibration sensing optical fiber is electrically connected to the optical fiber vibration demodulator.

10. The buried pipeline leakage testing device according to claim 1, characterized in that, The burial depth of the simulated leak pipe is not less than 0.8m, and the height difference between the temperature sensing fiber and the vibration sensing fiber and the simulated leak pipe is not greater than 0.1m.

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