CN216208480U - Buried pipeline stray current interference monitoring device and system - Google Patents
Buried pipeline stray current interference monitoring device and system Download PDFInfo
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- CN216208480U CN216208480U CN202122281368.8U CN202122281368U CN216208480U CN 216208480 U CN216208480 U CN 216208480U CN 202122281368 U CN202122281368 U CN 202122281368U CN 216208480 U CN216208480 U CN 216208480U
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Abstract
The utility model provides a device and a system for monitoring stray current interference of a buried pipeline. The monitoring device comprises a test strip box and a test line. The test block box comprises a box body and a box cover, wherein the box body is detachably connected with the box cover. The box body comprises a base, a test board, a test piece groove and a through hole, wherein the test board is formed by outwards protruding the base, the test piece groove is formed by inwards sinking the test board, and the through hole is communicated with the test piece groove and the outside. The test wire passes through the through hole to contact with the bottom of the test piece groove, and the surface of the box cover is provided with a test piece exposed hole. The system comprises the device, and further comprises a pipeline, a test pile, a data recorder and a reference electrode. The beneficial effects of the utility model can include: the manual damage to the test piece in the field operation process can be avoided; is favorable for embedding, sampling and replacing the test piece.
Description
Technical Field
The utility model relates to the field of oil and gas pipelines, in particular to the field of stray current interference and cathodic protection monitoring of buried pipelines.
Background
In recent years, the infrastructure of high-voltage/ultrahigh-voltage transmission lines, high-speed railways, urban subways and the like in China develops rapidly, the problem that oil and gas pipelines suffer from alternating current, direct current and even alternating current and direct current mixed interference is serious day by day, and serious threats are caused to the corrosion of pipe bodies and the operation safety of the pipelines. The corrosion process of the pipeline under the alternating current and direct current interference is complex, and a plurality of influencing factors are influenced by factors such as the chemical property of soil (such as the types of soil ions, pH and the like) and the defect size and shape of an anticorrosive coating besides alternating current interference voltage, alternating current density and cathodic protection potential. With the increasing number of interference sources, the interference types and the environment become more and more complex, and no consensus is reached at home and abroad aiming at the interference law of stray currents of different interference sources and the corrosion behavior and mechanism of interference pipelines. Various foreign standards provide various indexes for comprehensively evaluating the corrosion possibility and risk of the stray current, including alternating current and direct current potentials, alternating current density, alternating current and direct current density ratio, soil resistivity and the like.
The test piece method is one of the common means for detecting the cathode protection effect of the buried pipeline and evaluating the stray current interference, and is characterized in that a corrosion test piece which is made of the same material as the buried pipeline is buried in the soil near the pipeline, the corrosion test piece is electrically connected with the pipeline, and the cathode protection performance verification and the stray current interference parameter measurement are carried out after the polarization is fully carried out. However, a large number of field actual measurements show that the calculated value of the alternating current density and the actual measured value of the test piece often have an order of magnitude difference, and the embedding time and the polarization state of the corrosion test piece have a great influence on the test value of the alternating current interference in the test process, thereby bringing great uncertainty to the alternating current interference risk assessment result.
Meanwhile, the corrosion test piece generally connects the non-testing surface of the test piece with the testing line and then is packaged by the polymer, and the test piece is matched with the reference electrode and the data recorder to test the on-off potential, the alternating current and direct current and other stray current interference parameters after being buried. For the traditional corrosion test piece packaged well, when periodic corrosion rate, corrosion morphology and the like are tested, a test line and a packaging object need to be removed, so that the test piece cannot be damaged, the test piece is complex to process, and the test accuracy is reduced due to relatively large test errors. In addition, when parameters such as the material, the area, the thickness of the corrosion protection layer and the like of the corrosion test piece are adjusted on site according to actual corrosion working conditions, the traditional corrosion test piece cannot meet the test requirements.
SUMMERY OF THE UTILITY MODEL
The present invention aims to address at least one of the above-mentioned deficiencies of the prior art. For example, the conventional corrosion coupon is cumbersome to process, and the coupon is easily damaged during the processing process, which increases the testing error. For another example, the material, area, and thickness of the corrosion protection layer of the conventional corrosion test piece cannot be adjusted on site.
In order to achieve the aim, the utility model provides a buried pipeline stray current interference monitoring device. The monitoring device comprises a test strip box and a test line. Wherein, the test block box includes box body and lid, and the box body can be dismantled with the lid and be connected. The box body comprises a base, a test board, a test piece groove and a through hole, wherein the test board is formed by outwards protruding the base, the test piece groove is formed by inwards sinking the test board, and the through hole penetrates from the test piece groove to the outside. The test wire passes through the through hole to contact with the bottom of the test strip groove. The surface of the box cover is provided with a test piece exposed hole.
Further, the test strip box is made of an insulating material.
Further, the lid still has the fixed lattice, the fixed lattice is located the naked hole below of test block and exposes jogged joint with the test block, be provided with first sealing member in the fixed lattice.
Further, the monitoring device also comprises a second sealing element, and the second sealing element can seal a gap between the through hole and the test line.
Further, the test piece exposed hole is a circular hole.
Furthermore, the metal wire cores of the test wires are scattered and spread at the bottom of the test piece groove.
Another aspect of the utility model provides a buried pipeline stray current interference monitoring system. The monitoring system comprises any one of the buried pipeline stray current interference monitoring devices, and further comprises a pipeline, a test pile, a data recorder and a reference electrode. Wherein, the pipeline is buried in soil, and is connected with the test stake electricity. The test strip box has the same burial depth as the pipeline and is consistent with the soil environment where the pipeline is located. The upper surface of the test piece is opposite to the reference electrode and is in close contact with the soil. The test strip box is electrically connected with the data recorder through the test line. The reference electrode is electrically connected with the data recorder, and the data recorder is electrically connected with the test pile.
Compared with the prior art, the beneficial effects of the utility model can include: the manual damage to the test piece in the field operation process can be avoided; the operation is simple, the accuracy and the measurement efficiency are high, and the test piece can be adjusted or replaced on site according to the actual working condition; can be repeatedly used for many times, and can reduce the monitoring cost.
Drawings
Fig. 1 shows a schematic structural diagram of a buried pipeline stray current interference monitoring apparatus in an exemplary embodiment of the present invention.
Fig. 2 shows a schematic diagram of a buried pipeline stray current interference monitoring system in an exemplary embodiment of the utility model.
The labels in the figure are:
the test piece comprises a test piece box 1, a test piece box 2, a test piece cover 3, a base 3, a test table 4, a test piece groove 5, a through hole 6, a test piece exposed hole 7, a test piece 8, a test line 9, a fixing grid 10, a first sealing element 11, a thread 12, a second sealing element 13, a metal wire core 14, a test piece upper surface 15, a pipeline 16, a test pile 17, a data recorder 18 and a reference electrode 19.
Detailed Description
In the following, the pipe stray current interference monitoring apparatus and system of the present invention will be described in detail in connection with exemplary embodiments.
In the description of the present application, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a particular orientation, be constructed in a particular orientation, and be operated, and thus should not be construed as limiting the present application.
Herein, the terms "first," "second," and the like are used for convenience of description and for convenience of distinction, and are not to be construed as indicating or implying relative importance or order of parts.
In an exemplary embodiment of the utility model, the buried pipeline stray current interference monitoring device comprises a test box and a test wire.
The test block box comprises a box body and a box cover.
The box body comprises a base, a test board, a test piece groove and a through hole. As shown in fig. 1, the testing platform 4 is formed by the base 3 protruding outwards (upwards in fig. 1), the test strip groove 5 is formed by the testing platform 4 recessed inwards (downwards in fig. 1), the test strip groove 5 is used for placing the test strip 8, and the through hole 6 penetrates from the test strip groove 5 to the outside, for example, the through hole 6 penetrates from the test strip groove 5 to the testing platform 4 and the base 3, and communicates the test strip groove 5 with the outside. Wherein, the diameter of the test bench 4 is less than that of the base 3, and the diameter of the test piece groove 5 is less than that of the test bench 4. Further, the test piece groove 5 is a circular groove.
As shown in fig. 1 and 2, the test strip slot 5 is used for holding the test strip 8, when the test strip is held, the testing surface of the test strip 8 is upward (toward right in fig. 2) as the upper surface 15 of the test strip, and the non-testing surface of the test strip 8 is downward as the lower surface of the test strip and contacts with the bottom of the test strip slot 5. Further, the area and the depth of the test piece groove 5 are matched with the size of the test piece 8, so that the depth of the test piece groove 5 is less than the thickness of the test piece 8, and the test piece 8 can be placed in the test piece groove 5.
One end of the test line 9 passes through the through hole 6 and contacts with the bottom of the test piece groove 5 at the bottom of the test piece 8 (when the test piece 8 is arranged in the test piece groove 5, one end of the test line 9 contacts with the lower surface of the test piece 8 at the same time), and the other end of the test line 9 is exposed outside the test piece box 1. Further, the test wire 9 is spread and paved at the bottom of the test piece groove 5 by the metal wire core 14, so as to ensure the stable contact between the test wire 9 and the test piece 8 when the test piece 8 is in the test piece groove 5. The metal wire core 14 may be obtained by stripping off the insulating sheath of the test wire 9.
The surface (upper surface in fig. 1) of the box cover 2 is provided with a test piece exposed hole 7, and the test piece exposed hole 7 can enable the inner space of the test piece box 1 to be communicated with the outside. When a test piece 8 is arranged in the test piece groove 5, the upper surface of the test piece 8 can be contacted with the outside through the test piece exposed hole 7 after the box cover 2 is connected with the box body. The height of the test piece exposed hole 7 can be adjusted according to the thickness of the simulated corrosion-resistant layer or according to the monitoring requirement, so that the device can be suitable for stray current interference monitoring in different environments. Further, the test piece exposed hole 7 is a circular hole.
Meanwhile, the box cover 2 and the box body are connected to form the test piece box 1, and then the upper surface 15 of the test piece can be in contact with the outside through the test piece exposed hole 7. Furthermore, the box cover 2 is connected with the box body, so that the test piece 8 can be tightly contacted with one end of the test line 9 by compaction.
Further, the test card box 1 (including the box body and the box cover 2) is made of an insulating material, such as organic glass or polytetrafluoroethylene.
Further, test piece groove 5 is located box body upper surface center, test piece naked hole 7 is located lid 2 surface center, and box body and lid 2 are connected back box body upper surface center coaxial with lid 2 surface center.
Furthermore, when the testing device is used for alternating current interference testing of buried pipelines, the exposed hole 7 of the test piece is 1-10 cm2The circular hole can be adjusted according to the actual situation on site if other sizes and shapes are required.
Further, as shown in fig. 1, the box cover 2 further has a fixing grid 10, and the fixing grid 10 is located below the test piece exposed hole 7 and the inner wall of the box cover 2, and is connected to the test piece exposed hole 7. A first sealing member 11, such as a rubber ring, a sealing rubber ring, etc., is disposed in the fixing frame 10. When the test strip 8 is in the test strip groove 5, the first sealing member 11 can prevent environmental medium from invading the test strip groove 5, so as to prevent corrosion of the non-testing surface (such as the lower surface or the side surface of the test strip) of the test strip 8. The diameter of the fixing frame 10 is larger than that of the exposed hole 7 of the test piece, so that the first sealing member 11 disposed in the fixing frame 10 can better seal the test piece groove 5 (or the inner space of the test piece box 1).
Further, the box body and the box cover 2 can be connected through threads 12, and the threads 12 are respectively arranged on the outer wall of the test bench 4 and the inner wall of the box cover 2. When box body and lid 2 passed through threaded connection, connect box body and lid 2 through the mode of rotatory lid monitoring devices when having first sealing member 11, can make the better sealed test piece groove of first sealing member 11. In the same way, the rotating box cover 2 is connected with the box body, and can further compress the contact between the test line 9 and the lower surface of the test piece.
Further, the monitoring device further comprises a second sealing member 13, wherein the second sealing member 13 can seal a gap between the through hole 6 and the test line 9, for example, the second sealing member 13 is arranged at the position where the test line 9 and the through hole 6 are combined on the surface of the box body. The second sealing element 13 can prevent environmental media from invading the test strip groove 5, and avoid corrosion of the non-testing surface of the test strip. The second sealing element 13 may be a sealing ring, or may be formed of a sealing material such as silicone rubber, rosin, or paraffin, which can perform a sealing function.
Furthermore, the testing device can also be used as a self-corrosion probe, and because the testing device only has one corrosion testing surface, the testing device can avoid the testing errors possibly caused by the fact that the thickness of a traditional self-corrosion test piece is not suitable and the edge of the test piece under the unknown corrosion environment, and enables the corrosion rate testing to be more accurate. Meanwhile, the design of the test piece box is beneficial to embedding and sampling the test piece, the test piece is protected in the test piece box, and the artificial damage in the field operation process can be avoided. Further, the test line can be fixed on the test strip box only, so as to facilitate searching, sample burying and sampling.
Example 2
In this exemplary embodiment, the stray current interference monitoring system for buried pipelines comprises a pipeline, a test pile, a data recorder, a reference electrode and any one of the stray current interference monitoring devices for pipelines in embodiment 1.
As shown in fig. 2, the pipe 16 is buried in the soil and electrically connected to the test pile 17.
The buried depth of the test card box 1 is the same as that of the pipeline 16 and is consistent with the soil environment where the pipeline 16 is located, for example, the distance between the pipelines 16 of the test card box 1 is 0.1-0.5 m. Further, the distance between the test strip box 1 and the pipeline 16 can be adjusted according to the actual conditions on site and determined according to the actual soil environment, so as to ensure that the soil environments of the test strip 8 and the pipeline are consistent.
The upper surface 15 of the test piece is opposed to the reference electrode 19 and is in close contact with the soil.
The test card box 1 is electrically connected with a data recorder 18 through the test line 9.
The reference electrode 19 is electrically connected to the data logger 18.
A data logger 18 is electrically connected to the test stakes 17, the data logger being capable of conducting stray current interference tests and recording test data.
In the exemplary embodiment, the buried pipeline stray current interference monitoring system can monitor stray current interference parameters such as on-off potential, self-corrosion potential, alternating current potential and alternating current and direct current density and evaluate the cathode protection effect.
In summary, the beneficial effects of the utility model can include
(1) The manual damage to the test piece in the field operation process can be avoided;
(2) the test piece is beneficial to burying, sampling and replacing;
(3) more accurate data such as stray current interference monitoring data of the buried pipeline, self-corrosion of the test piece, interference corrosion rate, cathode protection effectiveness and the like can be obtained.
Although the present invention has been described above in connection with the exemplary embodiments and the accompanying drawings, it will be apparent to those of ordinary skill in the art that various modifications may be made to the above-described embodiments without departing from the spirit and scope of the claims.
Claims (8)
1. A stray current interference monitoring device for a buried pipeline is characterized by comprising a test box and a test wire, wherein,
the test block box comprises a box body and a box cover, and the box body is detachably connected with the box cover;
the box body comprises a base, a test board, a test piece groove and a through hole, wherein the test board is formed by outwards protruding the base, the test piece groove is formed by inwards recessed the test board, and the through hole penetrates from the test piece groove to the outside;
the test wire passes through the through hole to contact with the bottom of the test piece groove;
the surface of the box cover is provided with a test piece exposed hole.
2. A buried pipeline stray current interference monitoring apparatus as claimed in claim 1 and wherein said cassette is of insulating material.
3. The device for monitoring stray current interference of buried pipeline according to claim 1, wherein said box cover further has a fixing grid, said fixing grid is located under and connected to the exposed hole of the test block, and said fixing grid is provided with a first sealing element therein.
4. A buried pipeline stray current interference monitoring apparatus according to claim 1, further comprising a second seal capable of sealing a gap between the penetration aperture and the test line.
5. A buried pipeline stray current interference monitoring device as claimed in claim 1 wherein said coupon exposed hole is a circular hole.
6. The device for monitoring stray current interference of buried pipelines according to claim 1, wherein the metal wire cores of said test wires are spread and laid at the bottom of the test strip groove.
7. A buried pipeline stray current interference monitoring system, which comprises the buried pipeline stray current interference monitoring device of any one of claims 1-6, and further comprises a pipeline, a test pile, a data recorder and a reference electrode, wherein,
the pipeline is buried in the soil and is electrically connected with the test pile;
the test piece box has the same buried depth as the pipeline and is consistent with the soil environment of the pipeline, and the upper surface of the test piece is opposite to the reference electrode and is in close contact with the soil;
the test strip box is electrically connected with the data recorder through the test line;
the reference electrode is electrically connected with the data recorder;
the data recorder is electrically connected with the test pile.
8. A self-corrosion probe comprising a buried pipeline stray current interference monitoring apparatus as claimed in any one of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122281368.8U CN216208480U (en) | 2021-09-18 | 2021-09-18 | Buried pipeline stray current interference monitoring device and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122281368.8U CN216208480U (en) | 2021-09-18 | 2021-09-18 | Buried pipeline stray current interference monitoring device and system |
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| Publication Number | Publication Date |
|---|---|
| CN216208480U true CN216208480U (en) | 2022-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122281368.8U Active CN216208480U (en) | 2021-09-18 | 2021-09-18 | Buried pipeline stray current interference monitoring device and system |
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| CN (1) | CN216208480U (en) |
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- 2021-09-18 CN CN202122281368.8U patent/CN216208480U/en active Active
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