An electromagnetic protection device for buried pipelines

Abstract

This invention provides an electromagnetic protection device for buried pipelines. The electromagnetic protection device includes an insulating flange assembly. An input pipeline section is connected to one end of a target pipeline section via the insulating flange assembly, and an output pipeline section is connected to the other end of the target pipeline section via the insulating flange assembly. This invention connects the input and output pipeline sections to the target pipeline section via the insulating flange assembly, ensuring that the target pipeline section is insulated from both the input and output pipeline sections, thereby achieving electrical isolation between the target pipeline section and other metal structures. This isolation effectively prevents the loss of cathodic protection current, ensuring that the protection current is concentrated on the target pipeline section, thus improving the overall efficiency of cathodic protection.

Description

Technical Field

[0001] This utility model relates to the technical field of cathodic protection and corrosion prevention, and in particular to an electromagnetic protection device for buried pipelines. Background Technology

[0002] With the rapid development of infrastructure construction in my country, the construction of new railways, highways, urban rail transit and other projects inevitably intersects with buried pipelines; and buried pipelines are used to transport important logistics such as oil and gas.

[0003] To ensure the safe operation of buried pipelines, the smooth construction of new projects, and the safe operation of new projects in the later stages, it is necessary to protect buried pipelines safely and efficiently.

[0004] Existing cathodic protection devices do not achieve electrical isolation between pipes and other metal structures, which can easily lead to the loss of cathodic protection current. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide an electromagnetic protection device for buried pipelines.

[0006] This utility model provides the following technical solution: an electromagnetic protection device for buried pipelines, wherein the buried pipeline includes an input pipeline section, a target pipeline section, and an output pipeline section; the electromagnetic protection device includes:

[0007] An insulating flange assembly is provided, wherein the input pipe section is connected to one end of the target pipe section via the insulating flange assembly, and the output pipe section is connected to the other end of the target pipe section via the insulating flange assembly.

[0008] A potentiostat, which is electrically connected to the target pipeline section via a wire;

[0009] An anode ground bed is electrically connected to the potentiostat via an anode cable.

[0010] Specifically, a cathode current is applied to the target pipeline section through the anode ground bed, causing cathodic polarization on the surface of the target pipeline section; the potentiostat is used to monitor the ground potential of the target pipeline section in real time and dynamically adjust the cathode current output to the target pipeline section.

[0011] Furthermore, the insulating flange assembly includes a first insulating flange component and a second insulating flange component. The mounting surface of the first insulating flange component is in close contact with the mounting surface of the second insulating flange component, thereby achieving a series sealed connection of the input pipeline section, the target pipeline section, and the output pipeline section.

[0012] Furthermore, a gasket is provided between the mounting surface of the first insulating flange and the mounting surface of the second insulating flange.

[0013] Furthermore, a test stake is connected in series between the potentiostat and the target pipeline section via the conductor; the test stake is used to monitor the corrosion of the pipeline.

[0014] Furthermore, the reference electrode of the potentiostat is buried at a distance of 1-2 meters from the target pipeline section.

[0015] Furthermore, the anode bed includes a plurality of auxiliary anodes and an anode bus connecting the plurality of auxiliary anodes together, the anode bus being connected to the anode cable, and the auxiliary anodes being surrounded by a resistance-reducing agent.

[0016] Furthermore, the filling thickness of the drag-reducing agent is greater than 10 cm.

[0017] Furthermore, the drag-reducing agent is coke particles.

[0018] The beneficial effects of this utility model are: by connecting the input pipe section and the output pipe section to the target pipe section through the insulating flange assembly, the target pipe section can be insulated from both the input and output pipe sections, thereby achieving electrical isolation between the target pipe section and other metal structures; through this isolation, the loss of cathodic protection current can be effectively prevented, ensuring that the protection current is concentrated on the target pipe section, thereby improving the overall efficiency of cathodic protection. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0020] The labels in the attached diagram are as follows: 1-buried pipeline, 10-input pipeline section, 11-target pipeline section, 12-output pipeline section, 2-test pile, 3-wire, 4-output cable, 5-potential constant, 6-anode cable, 7-anode ground bed, 71-auxiliary anode, 72-coke particles, 73-anode bus, 8-insulating flange assembly, 81-first insulating flange assembly, 82-second insulating flange assembly. Detailed Implementation

[0021] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this utility model will be more thorough and complete.

[0022] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0024] For reference Figure 1 The operator can cut the buried pipeline 1 to isolate the buried pipeline 1 located at the construction site of the new project. The buried pipeline 1 located at the construction site of the new project is now the... Figure 1 Target pipeline segment 11;

[0025] This utility model provides an electromagnetic protection device for buried pipeline 1; see reference. Figure 1 It includes an insulating flange assembly 8, a potentiostat 5, and an anode ground bed 7;

[0026] The following is a description of insulating flange group 8:

[0027] The input pipe section 10 is connected to one end of the target pipe section 11 through the insulating flange assembly 8, and the output pipe section 12 is connected to the other end of the target pipe section 11 through the insulating flange assembly 8.

[0028] Specifically, a first insulating flange 81 is fixedly connected to one end of the input pipe section 10, and a second insulating flange 82 is fixedly connected to one end of the target pipe section 11. Before connecting the first insulating flange 81 and the second insulating flange 82, the surfaces of the first insulating flange 81 and the second insulating flange 82 must be cleaned with a specific cleaning agent, and a gasket is placed between the mounting surfaces of the first insulating flange 81 and the second insulating flange 82. Then, the first insulating flange 81 and the second insulating flange 82 are fixed by locating pins to ensure that they are fixed during installation. Next, the holes of the first insulating flange 81 and the second insulating flange 82 are aligned one-to-one, and then the first insulating flange 81 is fixed by bolts. An insulating flange assembly 81 is fastened to a second insulating flange, with a gasket located between the mounting surfaces of the first insulating flange assembly 81 and the second insulating flange, achieving a good sealing effect. The connection between the other end of the target pipe section 11 and the output pipe section 12 is similar to the connection between the input pipe section 10 and the target pipe section 11, and will not be elaborated further here. Through the function of the insulating flange assembly 8, the target pipe section 11 can be insulated from both the input pipe section 10 and the output pipe section 12, thereby achieving electrical isolation between the target pipe section 11 and other metal structures. This isolation effectively prevents the loss of cathodic protection current, ensuring that the protection current is concentrated on the target pipe section 11, thereby improving the overall efficiency of cathodic protection.

[0029] The following is a description of potentiostat 5:

[0030] The output cable 4 of the potentiostat 5 is electrically connected to the target pipe section 11 via the wire 3; the potentiostat 5 is used to monitor the ground potential of the target pipe section 11 in real time and dynamically adjust the cathode current output to the target pipe section 11.

[0031] The installation of potentiostat 5 can be referenced in the following description:

[0032] Install the potentiostat 5 on the designated bracket or wall, ensuring that the bottom of the potentiostat 5 is at least 30cm above the ground for ventilation and heat dissipation; use a level to adjust the position of the potentiostat 5, ensuring that its levelness deviation does not exceed ±2mm;

[0033] The power supply voltage of the potentiostat 5 should conform to the rated voltage of the potentiostat 5; a leakage current protection switch should be installed at the power input terminal of the potentiostat 5, and the rated current should be selected according to the power of the potentiostat 5.

[0034] The output cable 4 of the potentiostat 5 has a cross-sectional area of ​​16 mm². 2 Or 25mm 2 "Connect to the cathodic protection point of the target pipeline section 11 via wire 3;

[0035] The reference electrode of the potentiostat 5 is buried at a distance of 111 meters to 2 meters from the target pipeline section, at a depth of 0.5 meters to 1 meter, to ensure good contact between the reference electrode and the soil; then the lead wire of the reference electrode is connected to the reference electrode interface of the potentiostat 5.

[0036] The anode ground bed 7 is connected to the anode interface of the potentiostat 5 via the anode cable 6;

[0037] The following is a description of the anode bed 7:

[0038] The anode bed 7 is electrically connected to the potentiostat 5 via the anode cable 6; a cathode current is applied to the target pipeline section 11 through the anode bed 7, causing cathodic polarization on the surface of the target pipeline section 11; the burial depth of the anode bed 7 is generally 1.5 meters to 3 meters, and the distance from the target pipeline section 11 is 50 meters to 100 meters.

[0039] Specifically, the anode bed 7 includes multiple auxiliary anodes 71 and an anode bus 73 that connects the multiple auxiliary anodes 71 together. The anode bus 73 is connected to the anode cable 6. The auxiliary anodes 71 are surrounded by a resistance-reducing agent. The thickness of the resistance-reducing agent is greater than 10 cm. The resistance-reducing agent is coke particles 72.

[0040] The installation of the anode ground bed 7 can be referenced in the following description:

[0041] Select an area with low soil resistivity as the burial point of the anode bed 7, and use a soil resistivity tester to measure to ensure that the soil resistivity is less than 50 Ω·m;

[0042] Excavators are used to dig trenches for the ground bed. The trenches are generally 1.5 to 3 meters deep, 0.5 to 1 meter wide, and the length is determined according to the number of anodes.

[0043] The auxiliary anodes 71 are evenly arranged at the bottom of the trench according to the design spacing, which is usually 3 to 5 meters.

[0044] Using an electric welding machine, connect the auxiliary anode 71 to the anode bus 73 (the cross-sectional area is typically 16mm²). 2 Or 25mm 2 "For a reliable connection, the weld joints must be coated with epoxy resin."

[0045] Coke particles 72 are filled around the auxiliary anode 71, with a filler thickness of not less than 10cm, to reduce the grounding resistance and extend the life of the auxiliary anode 71.

[0046] Furthermore, a test stake 2 is connected in series between the potentiostat 5 and the target pipeline section 11 via a wire 3; the test stake 2 is used to monitor the corrosion of the pipeline; one end of the test stake 2 is electrically connected to the target pipeline section via the wire 3, and the other end of the test stake 2 is electrically connected to the output cable 4 of the potentiostat 5.

[0047] Specifically, by using the potential data and other information from the test pile 2, the corrosion risk of the pipeline can be assessed, thereby monitoring the corrosion status of the pipeline. This will help to develop a more scientific and effective pipeline maintenance and inspection plan, promptly identify potential corrosion hazards in the pipeline, avoid safety accidents such as pipeline perforation and leakage caused by corrosion, and ensure the integrity and reliability of the natural gas pipeline.

[0048] The installation of test pile 2 can be referenced as follows:

[0049] Excavate a foundation pit at the selected location. The pit depth is generally 0.8 meters to 1.2 meters, and the bottom dimension of the pit is slightly larger than the base dimension of test pile 2.

[0050] Lay a 10cm-15cm thick layer of sand and gravel at the bottom of the pit to ensure that the foundation is flat and has good drainage;

[0051] Place the base of test pile 2 on the pad, and use a level to adjust its verticality to ensure that the deviation does not exceed ±2mm;

[0052] After placing test pile 2, backfill the foundation pit in layers, with each layer not exceeding 30cm in thickness, and use a tamping machine to compact each layer to ensure the stability of test pile 2.

[0053] In summary, by connecting the input pipe section 10 and the output pipe section 12 to the target pipe section 11 through the insulating flange assembly 8, the target pipe section 11 can be insulated from both the input pipe section 10 and the output pipe section 12, thereby achieving electrical isolation between the target pipe section 11 and other metal structures. This isolation effectively prevents the loss of cathodic protection current and ensures that the protection current is concentrated on the target pipe section 11, thereby improving the overall efficiency of cathodic protection.

[0054] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0055] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An electromagnetic protection device for buried pipelines, the buried pipeline comprising an input pipeline section, a target pipeline section, and an output pipeline section; characterized in that, The electromagnetic protection device includes: An insulating flange assembly is provided, wherein the input pipe section is connected to one end of the target pipe section via the insulating flange assembly, and the output pipe section is connected to the other end of the target pipe section via the insulating flange assembly. A potentiostat, which is electrically connected to the target pipeline section via a wire; An anode ground bed is electrically connected to the potentiostat via an anode cable. Specifically, a cathode current is applied to the target pipeline section through the anode ground bed, causing cathodic polarization on the surface of the target pipeline section; the potentiostat is used to monitor the ground potential of the target pipeline section in real time and dynamically adjust the cathode current output to the target pipeline section.

2. The electromagnetic protection device according to claim 1, characterized in that, The insulating flange assembly includes a first insulating flange and a second insulating flange. The mounting surface of the first insulating flange and the mounting surface of the second insulating flange are tightly fitted together, thereby achieving a series sealed connection of the input pipeline section, the target pipeline section, and the output pipeline section.

3. The electromagnetic protection device according to claim 2, characterized in that, A gasket is provided between the mounting surface of the first insulating flange and the mounting surface of the second insulating flange.

4. The electromagnetic protection device according to claim 1, characterized in that, A test stake is connected in series between the potentiostat and the target pipeline section via the conductor; the test stake is used to monitor the corrosion of the pipeline.

5. The electromagnetic protection device according to claim 1, characterized in that, The reference electrode of the potentiostat is buried at a distance of 1-2 meters from the target pipeline section.

6. The electromagnetic protection device according to claim 1, characterized in that, The anode bed includes multiple auxiliary anodes and an anode bus connecting the multiple auxiliary anodes together. The anode bus is connected to the anode cable, and the auxiliary anodes are surrounded by a resistance-reducing agent.

7. The electromagnetic protection device according to claim 6, characterized in that, The drag-reducing agent has a filling thickness greater than 10 cm.

8. The electromagnetic protection device according to claim 7, characterized in that, The drag-reducing agent is coke particles.

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