Buried pipeline cathode protection testing device and testing method thereof

Abstract

The invention relates to the field of buried pipeline cathodic protection testing, in particular to a buried pipeline cathodic protection testing device and a testing method.The cathodic protection testing device comprises a potential checking piece, the potential checking piece is buried close to a pipeline and connected with a control circuit, the control circuit is connected with the pipeline, and the control circuit is connected with the pipeline. The control circuit comprises a control button, the control button is arranged in the test pile, and the control button is configured to be disconnected when pressed down and automatically reset when loosened. A worker can directly measure the power-off potential at the test pile by operating the control button, and accurate and rapid acquisition of IR drop potential parameters is realized. According to the cathodic protection test method, the existing test pile is transformed and upgraded, so that the instantaneous on-off control of the pipeline and the potential check sheet can be completed at the existing test pile, a worker can quickly and accurately obtain the IR drop potential of the buried pipeline, and the test efficiency and the test accuracy are improved.

Description

Technical Field

[0001] The invention relates to the field of buried pipeline cathode protection testing, and in particular to a buried pipeline cathode protection testing device and a testing method thereof. Background Art

[0002] Cathodic protection technology is a type of electrochemical protection technology. Its principle is to apply an external current to the surface of the corroded metal structure, and the protected structure becomes the cathode, so that the electron migration caused by metal corrosion is suppressed, avoiding or weakening the occurrence of corrosion. Existing buried steel long-distance oil and gas pipelines, oil and gas field transmission pipelines, and buried gathering and transportation trunk pipelines in oil and gas fields all adopt cathodic protection measures. Test piles are set at intervals along the pipeline to test the cathodic protection operating parameters and judge the cathodic protection effect along the pipeline. In the existing test piles, multiple wiring terminals are set on the insulating panel, and the wires of each wiring terminal are connected to the buried inspection piece. The inspection piece is set at different positions near the buried pipeline according to different test data. By testing the corresponding operating parameters of different wiring terminals, the cathodic protection operating status is tested.

[0003] During the test of the existing test pile, a reference electrode is buried near the pipeline, and the potential difference between the reference electrode and the pipeline is measured to obtain the cathodic protection power-on potential value of the pipeline. However, due to the influence of the electrolyte soil, the cathodic protection current of the buried pipeline will flow through the electrolyte soil and then flow into the pipeline to form a loop. The potential data obtained by testing and calculating through the terminal block actually includes the soil electrolyte potential, which is different from the actual operating parameters of the cathodic protection. The important indicator for judging the cathodic protection effect of the pipeline is the real potential of the buried pipeline after polarization is completed, that is, the IR drop potential.

[0004] Therefore, based on the existing test pile structure, how to accurately and quickly obtain the IR drop potential parameters of the cathodic protection operation parameters has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to provide a buried pipeline cathodic protection test device and a test method thereof in view of the technical problem that the prior art cannot accurately and quickly obtain the IR drop potential parameters of the cathodic protection operation parameters.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is: A buried pipeline cathodic protection test device comprises a potential inspection piece, wherein the potential inspection piece is buried near the pipeline, the potential inspection piece is connected to a control circuit, the control circuit is connected to the pipeline, the control circuit comprises a control button, the control button is arranged in a test pile, and the control button is constructed to be disconnected when pressed and automatically reset when released.

[0007] A buried pipeline cathodic protection test device of the present invention realizes the connection between the pipeline and the potential inspection piece through a control circuit, and the control button of the control circuit is arranged in the test pile, so that the staff can directly measure the power-off potential, that is, the IR drop potential, by operating the control button at the test pile, so as to realize accurate and rapid acquisition of the IR drop potential parameters. At the same time, the control circuit has a simple structure and can be easily modified and arranged on the existing test pile, thereby providing support for the structural upgrade of the existing test pile.

[0008] As a preferred solution of the present invention, the control circuit includes an instantaneous on-off control circuit, the instantaneous on-off control circuit includes a first normally closed switch, the first normally closed switch is connected in series with the control button, and the first normally closed switch is connected to a trigger circuit. The instantaneous on-off of the control circuit is controlled by the trigger circuit, making the instantaneous on-off of the control circuit more controllable, so as to better meet the instantaneous on-off requirements and improve the test accuracy.

[0009] As a preferred solution of the present invention, the trigger circuit includes a relay coil, and the relay coil is associated with the first normally closed switch. The trigger circuit is composed of a relay coil and a normally closed contact, which has a simple structure and a small size, and can be easily installed in the narrow space of an existing test pile.

[0010] As a preferred solution of the present invention, the relay coil is connected to the power supply mechanism through a power supply control circuit, and the power supply control circuit includes a normally open button and a second normally closed switch connected in series, the normally open button is arranged in the test pile, the normally open button is configured to be turned on when pressed and automatically reset when released, and the second normally closed switch is associated with the relay coil. The on-off control of the trigger circuit is realized through the power supply control circuit, thereby realizing effective instantaneous control of the control circuit, making the control accuracy higher and improving the test accuracy.

[0011] As a preferred embodiment of the present invention, the power supply mechanism includes a dry cell or a solar power storage mechanism.

[0012] As a preferred solution of the present invention, the relay coil is connected in parallel to an on / off indicator light, so that the staff can intuitively obtain the on / off status of the control circuit through the on / off indicator light, and then judge whether the operation meets the requirements, thereby reducing the requirements for staff experience during the test process and improving the test accuracy.

[0013] As a preferred solution of the present invention, a support plate is included, and the support plate can be embedded in the test pile, and the control button is arranged on the support plate, so as to realize the installation of the cathodic protection test device in the narrow space of the existing test pile, and realize the transformation and upgrading of the existing test pile.

[0014] As a preferred solution of the present invention, the normally open button is arranged on the support plate to form a cathodic protection test device with dual operation functions, which is convenient for workers with different experience levels to quickly and accurately obtain the IR drop potential.

[0015] As a preferred solution of the present invention, the support plate includes a rectangular insulating plate, a plurality of test holes are arranged in the support plate, a plurality of test columns are coaxially arranged behind the test holes, the test column wires are connected to the function inspection sheet, and the function inspection sheet includes a reference electrode. The function inspection sheet can be provided with polarization probes, corrosion inspection sheets, and weightlessness inspection sheets according to actual conditions, so as to realize the integration of potential testing and other test functions in one test pile, and expand the functionality of the cathodic protection test device.

[0016] A method for testing cathodic protection of buried pipelines comprises the above-mentioned cathodic protection testing device for buried pipelines, and comprises the following steps: S1, excavating a pipeline near a test pile; S2, setting a potential inspection sheet and a reference electrode, maintaining a spacing of 0.1-0.3m between the potential inspection sheet and the pipeline in the transverse diameter direction, maintaining a spacing of 0.1-0.3m between the reference electrode and the potential inspection sheet, making the potential inspection sheet, the reference electrode and the pipeline in the same horizontal soil layer, and connecting the test cable to the cathodic protection test device in the test pile; S3, backfilling the original soil in layers; S4, after polarization for at least 24 hours, using a digital multimeter resistance range to test the on-state potential and the off-state potential, wherein the off-state potential is tested by instantaneously pressing and then releasing a control button to achieve instantaneous on and off, or by pressing a normally open button to achieve instantaneous on and off; S5, repeatedly pressing the control button or the normally open button, testing a number of on-state potential and off-state potential data and then calculating the average value.

[0017] A buried pipeline cathodic protection test method of the present invention, by upgrading and modifying an existing test pile, arranging a cathodic protection test device in the existing test pile, and realizing instantaneous on-off control of the pipeline and the potential inspection piece at the existing test pile, is conducive to the staff to quickly and accurately obtain the IR drop potential of the buried pipeline, and improves the test efficiency and test accuracy.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the buried pipeline cathodic protection testing device of the present invention are: 1. The pipeline is connected to the potential inspection piece through the control circuit, and the control button of the control circuit is set in the test pile, so that the staff can directly measure the power-off potential, that is, the IR drop potential, by operating the control button at the test pile, so as to achieve accurate and rapid acquisition of the IR drop potential parameters; 2. The control circuit structure is simple and can be easily modified and set up on the existing test piles, providing support for the structural upgrade of the existing test piles; The beneficial effects of the buried pipeline cathodic protection testing method of the present invention are: By upgrading the existing test piles and installing cathodic protection test devices in the existing test piles, instantaneous on-off control of the pipeline and the potential inspection piece can be completed at the existing test piles, which is conducive to the staff to quickly and accurately obtain the IR drop potential of the buried pipeline and improve the test efficiency and test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a buried pipeline cathodic protection testing device of the present invention; Figure 2 It is a side view of a buried pipeline cathodic protection testing device of the present invention; Figure 3 is a schematic diagram of the structure of the control circuit described in Example 1; Figure 4 is a schematic diagram of the structure of the control circuit described in Example 2; Figure 5 This is a test status diagram of a buried pipeline cathodic protection test method in Example 5.

[0020] icon: 1-potential inspection sheet, 2-pipeline, 3-control button, 4-test pile, 5-first normally closed switch, 6-relay coil, 7-power supply mechanism, 8-normally open button, 9-second normally closed switch, 10-on / off indicator light, 11-support plate, 12-test hole, 13-reference electrode. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0022] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0023] Example 1 like Figure 1-Figure 5 As shown, a buried pipeline cathodic protection test device includes a potential inspection piece 1, which is buried near a pipeline 2, the potential inspection piece 1 is connected to a control circuit, the control circuit is connected to the pipeline 2, the control circuit includes a control button 3, the control button 3 is arranged in a test pile 4, and the control button 3 is constructed to be disconnected when pressed and automatically reset when released.

[0024] In a buried pipeline cathodic protection test device of the present embodiment, one end of the control circuit is connected to the pipeline 2, and the other end is connected to the potential inspection piece 1, so as to realize synchronous polarization of the pipeline 2 and the potential inspection piece 1, and the on-off control of the pipeline 2 and the potential inspection piece 1 is realized by the control button 3 arranged on the control circuit, and the control button 3 is arranged in the test pile 4, so that the staff can realize the disconnection of the pipeline 2 and the potential inspection piece 1 by pressing the control button 3 at the test pile 4, and realize the current between the pipeline 2 and the potential inspection piece 1 is zero, so as to instantly measure the potential between the pipeline 2 and the reference electrode 13, that is, the power-off potential, that is, the IR drop potential, so that the staff can directly measure the IR drop potential by operating the control button 3 at the test pile 4, and realize the accurate and rapid acquisition of the IR drop potential parameters, and at the same time, the control button 3 is a normally closed button, with a simple structure and a small size, and can be easily retrofitted and set on the existing test pile 4, and can quickly restore the connection between the pipeline 2 and the potential inspection piece 1 after being released, so as to realize the instantaneous on-off of the control circuit, provide support for the structural upgrade of the existing test pile 4, and have the advantage of being easier to promote and apply.

[0025] Example 2 A buried pipeline cathodic protection test device of the present embodiment has a structure similar to that of Embodiment 1, except that: the control circuit includes an instantaneous on-off control circuit, the instantaneous on-off control circuit includes a first normally closed switch 5, the first normally closed switch 5 is connected in series with the control button 3, the first normally closed switch 5 is connected to a trigger circuit, the trigger circuit includes a relay coil 6, the relay coil 6 is associated with the first normally closed switch 5, and the relay coil 6 is connected to a power supply mechanism 7 through a power supply control circuit.

[0026] A buried pipeline cathodic protection test device of the present embodiment utilizes the normally closed contacts of the relay to form a first normally closed switch 5, controls the action of the relay by triggering the circuit, realizes the on and off of the relay coil 6 by the on and off control of the relay, and then utilizes the automatic reset function of the normally closed switch contacts of the relay to realize the instantaneous on and off control of the first normally closed switch 5. The principle is simple and the size is small. It can be easily installed in the narrow space of the existing test pile 4, and it is easy to realize the instantaneous on and off of the control circuit to meet the instantaneous on and off of the potential inspection piece 1 and the pipeline 2, thereby improving the test accuracy.

[0027] Preferably, the power supply control circuit includes a normally open button 8 and a second normally closed switch 9 connected in series, the normally open button 8 is arranged in the test pile 4, the normally open button 8 is constructed to be turned on when pressed and automatically reset when released, and the second normally closed switch 9 is associated with the relay coil 6.

[0028] Specifically, another normally closed contact of the relay is used to form a second normally closed switch 9, so that the first normally closed switch 5 and the second normally closed switch 9 can operate synchronously. When the relay coil 6 is energized, the first normally closed switch 5 and the second normally closed switch 9 are instantly disconnected. When the relay coil 6 is powered off, they are restored synchronously, so that the power supply mechanism and the relay coil 6 are instantly turned on and off through the second normally closed switch 9, and the pipeline 2 and the potential inspection piece 1 are instantly turned on and off through the first normally closed switch 5. The on-off delay moment of the relay coil 6 and the contact is used to realize instantaneous on-off control of the trigger circuit, thereby realizing effective instantaneous control of the control circuit, making the control accuracy higher and improving the test accuracy.

[0029] Preferably, the power supply mechanism 7 includes a dry cell battery or a solar power storage mechanism.

[0030] Specifically, when the power supply mechanism 7 is set as a dry battery, the dry battery is embedded in the potential test pile 4 through a battery box or carried by the staff. When the power supply mechanism 7 is set as a solar power storage mechanism, a solar panel is set on the top of or near the test pile 4.

[0031] Preferably, when the power supply mechanism 7 is embedded in the test pile 4, it maintains a long-term connection state with the power supply control circuit to achieve rapid on-off control during testing.

[0032] Preferably, when the power supply mechanism 7 is carried by the staff, the power supply control circuit retains the conductive connection points at both ends, and the staff connects the external power supply mechanism 7 on site to avoid the possibility of external damage to the unattended test pile.

[0033] Example 3 In the buried pipeline cathodic protection testing device of this embodiment, based on the embodiment 2, the relay coil 6 is connected in parallel to the on-off indicator light 10 .

[0034] A buried pipeline cathodic protection test device of the present embodiment displays the on-off state of the control circuit by means of an on-off indicator light 10 arranged in parallel with the relay, so that the staff can intuitively obtain the instantaneous on-off state of the control circuit through the instantaneous on and off of the on-off indicator light 10, and then judge whether the operation meets the requirements, thereby reducing the requirements for personnel experience in the test process and improving the test accuracy.

[0035] Example 4 A buried pipeline cathodic protection test device of this embodiment, based on embodiments 1 to 3, includes a support plate 11, wherein the support plate 11 includes a rectangular insulating plate, the support plate 11 can be embedded in the test pile 4, the control button 3 is arranged on the support plate 11, and the normally open button 8 is arranged on the support plate 11.

[0036] A buried pipeline cathodic protection test device of the present embodiment has a rectangular insulating plate with the same structure and size as the panel inside the existing test pile 4, a plurality of test holes 12 are arranged on the support plate 11, and a plurality of test columns are coaxially arranged behind the test holes 12, the test column wires are connected to the function inspection sheet, and the arrangement state of the test holes 12 and the test columns are adjusted, and the control button 3 and the normally open button 8 are set at the same time, so as to realize the integration of the cathodic protection test device in the narrow space of the existing test pile 4, realize the transformation and upgrading of the existing test pile 4, and form a cathodic protection test device with dual operation functions, so as to facilitate workers with different experience levels to quickly and accurately obtain the IR drop potential. For workers with rich testing experience, the IR drop potential test can be realized by instantaneously pressing the control button 3, and the control line can be instantaneously turned on and off by pressing the normally open button 8. In theory, the IR drop potential measured by the two methods is consistent. Therefore, the test results can be checked by the two test methods to ensure the accuracy of the test results.

[0037] Preferably, the functional inspection sheet includes a reference electrode 13, and at least one of a polarization probe, a corrosion inspection sheet, and a weightlessness inspection sheet can be simultaneously set according to actual conditions. This allows the integration of potential testing and other test functions in one test pile, so that the existing test pile 4 can not only meet the potential test function, but also meet the insulation joint test function, pipeline cross test function, pipeline and metal casing insulation performance test function, pipeline and long-term reference electrode, polarization probe test function and other functions, so as to expand the functionality of the cathodic protection test device.

[0038] Specifically, Figure 5 As shown, in this embodiment, 10 copper terminals are arranged behind the support plate as test columns.

[0039] Specifically, identification diagrams are drawn corresponding to test columns with different functions to facilitate the use of testers.

[0040] Example 5 A method for testing cathodic protection of buried pipelines comprises the above-mentioned cathodic protection testing device for buried pipelines, and comprises the following steps: S1, excavating a pipeline 2 near a test pile 4; S2, setting a potential inspection piece 1 and a reference electrode 13, maintaining a spacing of 0.1-0.3m between the potential inspection piece 1 and the pipeline 2 in the transverse diameter direction, maintaining a spacing of 0.1-0.3m between the reference electrode 13 and the potential inspection piece 1, so that the potential inspection piece 1, the reference electrode 13 and the pipeline 2 are located in the same horizontal soil layer, and connected to the test pile 4 through a test cable; S3, backfilling the original soil in layers; S4, after polarization for at least 24 hours, using a digital multimeter resistance range to test the power-on potential and the power-off potential, when testing the power-off potential, instantaneous on and off is achieved by instantaneously pressing and then releasing the control button 3, or, by pressing the normally open button 8, instantaneous on and off is achieved; S5, repeatedly pressing the control button 3 or the normally open button 8, testing a number of power-on potential and power-off potential data and then calculating the average value.

[0041] A buried pipeline cathodic protection test method of the present embodiment involves improving an existing test pile 4 by setting a cathodic protection test device. Before the improvement, test tools such as a digital multimeter and a portable copper sulfate reference electrode are prepared, and the cathodic protection test device is installed in the existing test pile.

[0042] Specifically, during the transformation, the pipeline 2 is excavated near the test pile 4, and the potential inspection piece 1 is buried on the side of the pipeline 2, so that the distance between the pipeline 2 and the potential inspection piece 1 is 0.1m-0.3m, and the distance between the reference electrode 13 and the potential inspection piece 1 is 0.1m-0.3m. The pipeline 2, the potential inspection piece 1, and the reference electrode 13 are buried in the same soil as much as possible, and the original soil is backfilled in layers. Then, the test cable connected to the pipeline 2 is connected to the terminal of the relay, and the potential inspection piece 1 is connected to the corresponding terminal of the relay. The pipeline 2 and the potential inspection piece 1 are connected to form a whole through the test cable to start the polarization of the potential inspection piece 1. The polarization time is not less than 24 hours before testing.

[0043] Specifically, during the test, after the digital multimeter is turned on, select the resistance gear, insert the red test lead into the test hole on the support plate corresponding to the "Ω, V" hole, and insert the black test lead into the common terminal "com" to check whether the test leads and the multimeter can work normally. After the digital multimeter inspection is completed, select the DC voltage gear "2V", connect the red test lead to the seventh terminal, and the black test lead to the eighth terminal. After the multimeter reading is stable, you can read the "power-on potential" of the pipeline and the potential inspection piece 1, and then repeatedly press and hold the normally open button to continuously read the power-off potential and the power-on potential. At the same time, you can judge whether the on and off is normal through the on-off indicator light 10, or, by quickly and repeatedly pressing the control button 3, you can read the power-off potential and the power-on potential.

[0044] Specifically, for a newly built pipeline 2 or a location where frequent testing is required, a long-term reference electrode is buried.

[0045] A buried pipeline cathodic protection test method of the present embodiment is to modify and upgrade the existing test pile 4, and set a cathodic protection test device in the existing test pile 4, so as to achieve instantaneous on-off control of the pipeline 2 and the potential inspection piece 1 at the existing test pile 4, which is beneficial for the staff to quickly and accurately obtain the IR drop potential of the buried pipeline, and improve the test efficiency and test accuracy.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A buried pipeline cathodic protection test device, characterized in that: The invention comprises a potential inspection piece (1), wherein the potential inspection piece (1) is buried adjacent to a pipeline (2), wherein the potential inspection piece (1) is connected to a control circuit, wherein the control circuit is connected to the pipeline (2), wherein the control circuit comprises a control button (3), wherein the control button (3) is arranged in a test pile (4), and wherein the control button (3) is configured to be disconnected when pressed and automatically reset when released.

2. A buried pipeline cathodic protection test device as claimed in claim 1, characterized in that: The control circuit comprises an instantaneous on-off control circuit, the instantaneous on-off control circuit comprises a first normally closed switch (5), the first normally closed switch (5) is connected in series with the control button (3), and the first normally closed switch (5) is connected to a trigger circuit.

3. A buried pipeline cathodic protection test device as claimed in claim 2, characterized in that: The trigger circuit comprises a relay coil (6), and the relay coil (6) is associated and connected with the first normally closed switch (5).

4. A buried pipeline cathodic protection test device as claimed in claim 3, characterized in that: The relay coil (6) is connected to a power supply mechanism (7) via a power supply control circuit. The power supply control circuit is provided with a normally open button (8) and a second normally closed switch (9) connected in series. The normally open button (8) is arranged in the test pile (4). The normally open button (8) is configured to be turned on when pressed and automatically reset when released. The second normally closed switch (9) is connected in association with the relay coil (6).

5. A buried pipeline cathodic protection test device as claimed in claim 4, characterized in that: The power supply mechanism (7) includes a dry cell or a solar power storage mechanism.

6. A buried pipeline cathodic protection test device as claimed in claim 3, characterized in that: The relay coil (6) is connected in parallel to an on / off indicator light (10).

7. A buried pipeline cathodic protection test device as claimed in claim 4, characterized in that: It comprises a support plate (11), the support plate (11) can be embedded in a test pile (4), and the control button (3) is arranged on the support plate (11).

8. A buried pipeline cathodic protection test device as claimed in claim 7, characterized in that: The normally open button (8) is arranged on the support plate (11).

9. A buried pipeline cathodic protection test device according to any one of claims 1 to 8, characterized in that: The support plate (11) comprises a rectangular insulating plate, a plurality of test holes (12) are arranged in an array on the support plate (11), a plurality of test columns are coaxially arranged behind the test holes (12), the test column wires are connected to a function inspection sheet, and the function inspection sheet comprises a reference electrode (13).

10. A method for testing cathodic protection of buried pipelines, characterized in that: The method comprises a buried pipeline cathodic protection testing device as claimed in any one of claims 1 to 9, and comprises the following steps: S1, excavating a pipeline (2) near a test pile (4); S2, setting a potential inspection piece (1) and a reference electrode (13), maintaining a spacing of 0.1-0.3 m between the potential inspection piece (1) and the pipeline (2) in the transverse diameter direction, maintaining a spacing of 0.1-0.3 m between the reference electrode (13) and the potential inspection piece (1), so that the potential inspection piece (1), the reference electrode (13) and the pipeline (2) are located in the same horizontal soil layer, and connected to the test pile (4) via a test cable; S3, backfilling with original soil in layers; S4. After polarization for at least 24 hours, use a digital multimeter resistance range to test the on-state potential and the off-state potential. During the off-state potential test, the control button (3) is pressed and then released to achieve instant on and off, or the normally open button (8) is pressed to achieve instant on and off; S5. Repeatedly press the control button (3) or the normally open button (8) to test a number of power-on potential and power-off potential data and then calculate the average value.

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