Testing device for cathode protection of natural gas long-distance pipeline

Abstract

The utility model discloses a testing device for cathode protection of a natural gas long-distance pipeline, which comprises a pipeline, a test piece, an anode block and a reference electrode, and further comprises a buried column and a stand column, the top end of the buried column and the bottom end of the stand column are fixedly connected with connecting flanges, and a test box is arranged at the top of one side of the stand column. A test knob, a first connecting jack and a second connecting jack are arranged on the surface of the test box, the test knob comprises a bottom box, a first contact piece, a second contact piece, a third contact piece and a fourth contact piece are arranged at the bottom of the bottom box, a knob is arranged in the bottom box, a first conductive column and a second conductive column are arranged in the knob, and a cover plate is arranged on one side of the bottom box. A first conducting ring and a second conducting ring are arranged on one side of the cover plate. According to the testing device for cathode protection of the natural gas long-distance pipeline, the detection steps are simplified, the operation is simple, and the testing efficiency of field staff is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipeline protection, in particular to a testing device for cathodic protection of long-distance natural gas pipelines. Background Technique

[0002] Long-distance pipelines are used to transport crude oil, refined oil, natural gas and various chemical products that are in a fluid state at normal temperature. A large number of long-distance pipelines are used to transport natural gas in the Sichuan-East Gas Transmission Project and the West-East Gas Transmission Project. Existing long-distance pipelines are made of metal and are buried underground for a long time. The soil environment is complex and changeable, and they are easily corroded by formation water and other substances. To reduce corrosion, protection measures are usually taken for pipelines, including adding corrosion inhibitors, coating protection, stray current drainage protection and cathodic protection. In cathodic protection, in order to effectively evaluate the protection effect of pipelines, detection is required. In the publication (announcement) number: CN108441864A, a cathodic protection testing device and its testing method are disclosed. Parameter measurement is realized by manually switching switches, a multimeter and the positive and negative jacks of an external multimeter; in the publication (announcement) number: CN210030895U, a buried pipeline protection device with a cathodic protection test pile is disclosed. The loss condition of the anode block can be obtained by measuring the test box arranged in the cathodic test pile with a multimeter.

[0003] However, during the measurement process, they need to continuously switch switches or switch different wiring ports, and relevant measurement methods need to be consulted before detection. There are many on-site operation steps, which affect the work efficiency of on-site detection personnel. Content of the Utility Model

[0004] In order to solve the above defects, the utility model provides a testing device for cathodic protection of long-distance natural gas pipelines, which simplifies the steps for detecting long-distance natural gas pipelines, has simple operation, and improves the testing efficiency of on-site workers.

[0005] In order to achieve the above purpose, the technical solution provided by the utility model is a testing device for cathodic protection of long-distance natural gas pipelines, including a pipeline, a test piece, an anode block and a reference electrode, and further including a buried column and a column. The top of the buried column and the bottom of the column are both fixedly connected with connecting flanges, and the two flanges are fixed by bolts. A test box is arranged at the top of one side of the column, and a test knob, a first connection jack and a second connection jack are arranged on the surface of the test box;

[0006] The test knob includes a bottom box. The bottom of the bottom box is provided with a first contact piece, a second contact piece, a third contact piece and a fourth contact piece. The first contact piece, the second contact piece, the third contact piece and the fourth contact piece are annularly distributed around the center of the bottom box and the distance between adjacent contact pieces is equal. The reference electrode is electrically connected to the second contact piece through a cable. The anode block is electrically connected to the first contact piece through a cable. The test piece is electrically connected to the fourth contact piece through a cable. The pipeline is electrically connected to the third contact piece through a cable. A knob is arranged in the bottom box. A first conductive column and a second conductive column are arranged in the knob. A cover plate is arranged on one side of the bottom box. A first conductive ring and a second conductive ring are arranged on one side of the cover plate. The first conductive ring is electrically connected to the first connection jack through a cable. The second conductive ring is electrically connected to the second connection jack through a cable. A connecting wire is arranged between the first connection jack and the second connection jack.

[0007] Preferably, a fixing column is arranged at the center of the bottom of the bottom box, and a fixing hole is arranged on one side of the knob close to the fixing column.

[0008] Preferably, a wiring column is arranged on one side of each of the first contact piece, the second contact piece, the third contact piece and the fourth contact piece located outside the bottom box. The first contact piece, the second contact piece, the third contact piece, the fourth contact piece, the first conductive column, the second conductive column, the first conductive ring and the second conductive ring are made of metal materials.

[0009] Preferably, the first conductive ring and the second conductive ring are concentrically arranged. One end of the second conductive column contacts the surface of the second conductive ring, and one end of the first conductive column contacts the surface of the first conductive ring.

[0010] Preferably, a sealing cover is arranged on one side of the test box. A sealing rubber ring is arranged on one side of the sealing cover. A lock body is also arranged on the surface of the sealing cover.

[0011] Preferably, a bottom plate is fixedly connected to the bottom of the buried column.

[0012] Adopting the above technical solutions, the beneficial effects of the present utility model include: for the test device for the cathodic protection of the long-distance natural gas pipeline, the pipeline, the test piece, the anode block and the reference electrode are connected to the corresponding contact pieces of the test knob through wires and connected to the test knob through the first connection jack and the second connection jack. During detection, only need to plug in the first connection jack and the second connection jack, and then adjust the test knob to measure different parameters, avoiding repeated operation of switches or changing connection jacks, simplifying the detection steps, with simple operation, which is beneficial to improving the test efficiency of on-site staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the present utility model;

[0014] Figure 2 This is a first - perspective schematic diagram of the test knob of the present utility model;

[0015] Figure 3 This is a second - perspective schematic diagram of the test knob of the present utility model;

[0016] Figure 4 This is a distribution schematic diagram of each contact piece of the present utility model.

[0017] In the figure: 1 - buried column, 2 - upright column, 3 - flange, 4 - bolt, 5 - pipeline, 6 - test piece, 7 - anode block, 8 - reference electrode, 9 - test box, 10 - test knob, 101 - bottom box, 102 - first contact piece, 103 - second contact piece, 104 - third contact piece, 105 - fourth contact piece, 106 - knob, 107 - first conductive column, 108 - second conductive column, 109 - cover plate, 1010 - first conductive ring, 1011 - second conductive ring, 1012 - fixing column, 11 - first connection jack, 12 - second connection jack, 13 - connecting wire, 14 - sealing cover, 15 - sealing rubber ring, 16 - lock body, 17 - bottom plate. Specific embodiments

[0018] The following further explains the present utility model with reference to the accompanying drawings.

[0019] Embodiment 1: Please refer to Figures 1-4 , the present utility model provides a technical solution: A test device for cathodic protection of long - distance natural gas pipelines, including a pipeline 5, a test piece 6, an anode block 7, and a reference electrode 8. The pipeline 5 is buried in the ground to a depth of not less than 1 meter. The test piece 6 and the reference electrode 8 are distributed on both sides of the pipeline 5. The material of the test piece 6 is the same as that of the pipeline 5. The material of the reference electrode 8 is copper or copper sulfate. The potential of the reference electrode 8 is a constant value and is not affected by the soil. Its potential is the 0 - potential point. The anode block 7 is made of magnesium block or zinc block and is buried in the ground to a depth of not less than 1 meter. Multiple pipelines 5 are connected by electric welding to form a long - distance natural gas pipeline. The pipeline 5 can be an X80 - grade pipeline steel with a diameter of 1219 mm. It should be noted that the pipeline 5 is not limited to transporting natural gas.

[0020] It also includes a buried column 1 and a stand column 2. The buried column 1 and the stand column 2 are hollow rectangular columns. Connecting flanges 3 are fixedly connected to the top end of the buried column 1 and the bottom end of the stand column 2 respectively. The two flanges 3 are fixed by bolts 4. The buried column 1 is installed during the backfilling of the pipeline soil. After the entire pipeline is installed, the stand column 2 is installed. It should be noted that before backfilling, the wires on the surfaces of the pipeline 5, the test piece 6, the anode block 7 and the reference electrode 8 are installed, and one end of them passes through the center of the buried column 1. The whole column body is segmented, reducing the overall length and the single weight, which is convenient for transportation and installation.

[0021] A test box 9 is arranged at the top of one side of the stand column 2. A test knob 10, a first connection jack 11 and a second connection jack 12 are arranged on the surface of the test box 9. Before installing the stand column 2, the wire is connected to the test knob 10.

[0022] The test knob 10 includes a bottom box 101. A first contact piece 102, a second contact piece 103, a third contact piece 104 and a fourth contact piece 105 are arranged at the bottom of the bottom box 101. The first contact piece 102, the second contact piece 103, the third contact piece 104 and the fourth contact piece 105 are annularly distributed around the center of the bottom box 101 and the distances between adjacent contact pieces are equal. The specific structure is as Figure 4 shown. A knob 106 is arranged in the bottom box 101. A first conductive column 107 and a second conductive column 108 are arranged in the knob 106. A fixed column 1012 is arranged at the center of the bottom of the bottom box 101. A fixing hole is arranged on one side of the knob 106 close to the fixed column 1012, ensuring the stable rotation of the knob 106;

[0023] In order to ensure that the knob 106 rotates to an accurate position each time, eight limit slots A, B, C, D, a, b, c, d are arranged on the inner wall of the bottom box 101. The eight limit slots are arranged at equal intervals. Retractable balls are arranged at both ends of the knob 106, and the balls are adapted to the limit slots. Among them, the first contact piece 102 is located between the A-d slots, the second contact piece 103 is located between the c-a slots, the third contact piece 104 is located between the D-C slots, and the fourth contact piece 105 is located at the position corresponding to the B slot. The knob 106 is in a cross-shaped structure. When the knob 106 is located at the A-a slot, one end of the first conductive column 107 contacts the surface of the first contact piece 102, and one end of the second conductive column 108 contacts the surface of the second contact piece 103. When it is located at the B-b slot, one end of the first conductive column 107 contacts the surface of the fourth contact piece 105, and one end of the second conductive column 108 contacts the surface of the second contact piece 103. When it is located at the C-c slot, one end of the first conductive column 107 contacts the surface of the third contact piece 104, and one end of the second conductive column 108 contacts the surface of the second contact piece 103. When it is located at the D-d slot, one end of the first conductive column 107 contacts the surface of the third contact piece 104, and one end of the second conductive column 108 contacts the surface of the first contact piece 102;

[0024] Among them, the reference electrode 8 is electrically connected to the second contact piece 103 through a cable, the anode block 7 is electrically connected to the first contact piece 102 through a cable, the test piece 6 is electrically connected to the fourth contact piece 105 through a cable, and the pipeline 5 is electrically connected to the third contact piece 104 through a cable. One side of the bottom box 101 is provided with a cover plate 109. One side of the cover plate 109 is provided with a first conductive ring 1010 and a second conductive ring 1011. The first conductive ring 1010 is electrically connected to the first connection jack 11 through a cable, and the second conductive ring 1011 is electrically connected to the second connection jack 12 through a cable. A connection wire 13 is arranged between the first connection jack 11 and the second connection jack 12. When in normal pipeline protection mode during operation, the knob 106 is located in the D-d groove, and the current generated by the anode block 7 sequentially passes through the first contact piece 102, the first conductive column 107, the first conductive ring 1010, the connection wire 13, the second conductive ring 1011, the second conductive column 108, the third contact piece 104 and the pipeline 5 to achieve the protection of the pipeline.

[0025] Terminal posts are arranged on one side of the first contact piece 102, the second contact piece 103, the third contact piece 104 and the fourth contact piece 105 located outside the bottom box 101, which is convenient for wiring. The first contact piece 102, the second contact piece 103, the third contact piece 104, the fourth contact piece 105, the first conductive column 107, the second conductive column 108, the first conductive ring 1010 and the second conductive ring 1011 are made of metal material, preferably copper.

[0026] The first conductive ring 1010 and the second conductive ring 1011 are concentrically arranged. One end of the second conductive column 108 is in contact with the surface of the second conductive ring 1011, and one end of the first conductive column 107 is in contact with the surface of the first conductive ring 1010.

[0027] One side of the test box 9 is provided with a sealing cover 14. One side of the sealing cover 14 is provided with a sealing rubber ring 15, and a lock body 16 is also arranged on the surface of the sealing cover 14, which improves the sealing performance of the test box 9.

[0028] The bottom of the buried column 1 is fixedly connected with a bottom plate 17, which increases the contact area of the buried column 1 and improves the stability of the buried column 1.

[0029] When measuring the anode block 7, remove the connection wire 13, insert the two measurement terminals of the multimeter into the first connection jack 11 and the second connection jack 12 respectively, adjust the multimeter to the voltage range, and adjust the knob 106 to the A-a groove to measure the potential difference U1 between the anode block 7 and the reference electrode 8, and determine the loss condition of the anode block 7;

[0030] Judge whether the anode block 7 is installed in place. Turn the knob 106 to the B-b slot, measure the potential difference U2 between the test piece 6 and the reference electrode 8, turn the knob 106 to the C-c slot, and measure the potential difference U3 between the pipeline 5 and the reference electrode 8. If the potential difference U2 and the potential difference U3 are not much different, it indicates that the anode block 7 is not installed in place. If the potential difference U2 and the potential difference U3 are quite different, it indicates that the anode block 7 is installed in place.

[0031] In this document, relational terms such as first and second are used solely to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variation thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the element.

[0032] The above description is only the preferred embodiment of the prior art type of fixation and installation of the present utility model, and is not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A testing device for the cathodic protection of long-distance natural gas pipelines, comprising a pipeline (5), a test piece (6), an anode block (7), and a reference electrode (8), characterized in that: It also includes a buried column (1) and a stand column (2). Connecting flanges (3) are fixedly connected to the top end of the buried column (1) and the bottom end of the stand column (2). The two flanges (3) are fixed by bolts (4). A test box (9) is arranged at the top of one side of the stand column (2). A test knob (10), a first connection jack (11) and a second connection jack (12) are arranged on the surface of the test box (9). The test knob (10) includes a bottom box (101). A first contact piece (102), a second contact piece (103), a third contact piece (104) and a fourth contact piece (105) are arranged at the bottom of the bottom box (101). The first contact piece (102), the second contact piece (103), the third contact piece (104) and the fourth contact piece (105) are annularly distributed around the center of the bottom box (101) and the distance between adjacent contact pieces is equal. The reference electrode (8) is electrically connected to the second contact piece (103) through a cable. The anode block (7) is electrically connected to the first contact piece (102) through a cable. The test piece (6) is electrically connected to the fourth contact piece (105) through a cable. The pipeline (5) is electrically connected to the third contact piece (104) through a cable. A knob (106) is arranged in the bottom box (101). A first conductive column (107) and a second conductive column (108) are arranged in the knob (106). A cover plate (109) is arranged on one side of the bottom box (101). A first conductive ring (1010) and a second conductive ring (1011) are arranged on one side of the cover plate (109). The first conductive ring (1010) is electrically connected to the first connection jack (11) through a cable. The second conductive ring (1011) is electrically connected to the second connection jack (12) through a cable. A connecting wire (13) is arranged between the first connection jack (11) and the second connection jack (12).

2. The test device for the cathodic protection of long-distance natural gas pipelines according to claim 1, wherein: A fixing column (1012) is arranged at the center of the bottom of the bottom box (101). A fixing hole is arranged on one side of the knob (106) close to the fixing column (1012).

3. The test device for cathodic protection of long-distance natural gas pipelines according to claim 1, characterized in that: Terminal posts are arranged on one side of the first contact piece (102), the second contact piece (103), the third contact piece (104) and the fourth contact piece (105) located outside the bottom box (101). The first contact piece (102), the second contact piece (103), the third contact piece (104), the fourth contact piece (105), the first conductive column (107), the second conductive column (108), the first conductive ring (1010) and the second conductive ring (1011) are made of metal materials.

4. A testing device for cathodic protection of long-distance natural gas pipelines according to claim 1, characterized in that: The first conductive ring (1010) and the second conductive ring (1011) are concentrically arranged. One end of the second conductive column (108) contacts the surface of the second conductive ring (1011). One end of the first conductive column (107) contacts the surface of the first conductive ring (1010).

5. The testing device for the cathodic protection of long-distance natural gas pipelines according to claim 1, wherein: One side of the test box (9) is provided with a sealing cover (14), one side of the sealing cover (14) is provided with a sealing rubber ring (15), and a lock body (16) is further arranged on the surface of the sealing cover (14).

6. The testing device for the cathodic protection of long-distance natural gas pipelines according to claim 1, wherein: The bottom of the buried column (1) is fixedly connected with a bottom plate (17).

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