CN212335306U - Pipeline cathodic protection system - Google Patents
Pipeline cathodic protection system Download PDFInfo
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- CN212335306U CN212335306U CN202021730537.0U CN202021730537U CN212335306U CN 212335306 U CN212335306 U CN 212335306U CN 202021730537 U CN202021730537 U CN 202021730537U CN 212335306 U CN212335306 U CN 212335306U
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- insulating joint
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Abstract
The application discloses a pipeline cathodic protection system, which comprises an in-station pipeline, an insulating joint and an out-station pipeline; the system comprises a cathodic protection system of an area in a station, a cathodic protection system of a pipeline outside the station and a cathodic protection system of an insulated joint; the indoor area cathodic protection system includes: the system comprises a cathodic protection anode ground bed in a station, a cathodic protection potentiostat in the station and a pipeline potential sensor in the station; the off-station pipeline cathodic protection system comprises: the system comprises an out-station pipeline cathodic protection anode ground bed, an out-station pipeline cathodic protection potentiostat and an out-station pipeline potential sensor; the insulated joint cathodic protection system comprises: the device comprises an insulating joint anode ground bed, an insulating joint inner side constant potential rectifier, an insulating joint outer side constant potential rectifier, an insulating joint inner side pipeline potential sensor and an insulating joint outer side pipeline potential sensor. The method and the device can avoid the mutual interference phenomenon caused by the simultaneous operation of two sets of cathodic protection due to the difference between the environments in and out of the station.
Description
Technical Field
The application belongs to the technical field of cathodic protection and corrosion prevention, and particularly relates to a pipeline cathodic protection system for relieving the mutual influence between a pipeline and station cathodic protection in the process of pipeline cathodic protection.
Background
In oil and gas storage and transportation systems, cathodic protection technology is an important anti-corrosion measure. In practice, the long-distance pipeline and the in-station pipeline are electrically isolated through an insulating joint, so that cathodic protection of the in-station pipeline area and cathodic protection of the out-station long-distance pipeline are relatively independent. The problems existing in the prior art are as follows: because the environment difference between the interior and the exterior of the station is large, when two sets of cathodic protection operate simultaneously, mutual interference can occur: when the anode of one party is too close to the insulating joint or crosses over the insulating joint, the other party pipeline is interfered by the anode, the potential of the pipeline section interfered by the anode is deviated and is over-protected, so that an anticorrosive coating is stripped and hydrogen is crisp, if the potential sensor of the other party is exactly in the range of the interfered pipeline section, the output of the potentiostat is smaller, the normal protection range of the potentiostat is reduced, and the far-end pipeline is under-protected; when cathodic protection current required by one protected object is large and is too close to the insulating joint, the other pipeline is interfered by a cathode, the potential of a pipeline section in a cathode interference area is more positive, underprotection can occur, and if the potential sensor of the other pipeline is just in the range of the interfered pipeline section, the output of a potentiostat is more large, so that the far-end pipeline is over-protected. The core that produces above-mentioned problem is that the station interior station outer cathodic protection system distance is nearer, and the protected object is nearer apart from insulating joint distance in the station, leads to the coupling degree high, and the interact is obvious, and then has influenced the cathodic protection effect of the interior pipeline of coupling region, if influenced the operation of constant potential rectifier simultaneously, this kind of bad interact still can be enlarged, influences the cathodic protection of wider scope pipeline. Therefore, it is a research direction for those skilled in the art to develop a new kitchen waste treatment device to solve the above problems of the existing devices.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a pipeline cathodic protection system can avoid because of the station in and the off-station environmental difference, the mutual interference phenomenon that produces when two sets of cathodic protection that lead to move simultaneously.
The technical scheme is as follows:
a pipeline cathodic protection system comprises an in-station pipeline, an insulating joint and an out-station pipeline which are connected in sequence; the system comprises a cathodic protection system of an area in a station, a cathodic protection system of a pipeline outside the station and a cathodic protection system of an insulated joint; the indoor area cathodic protection system includes: the system comprises a cathodic protection anode ground bed in a station, a cathodic protection potentiostat in the station and a pipeline potential sensor in the station; the cathodic protection anode ground bed of the in-station area is buried in soil on one side of the in-station pipeline; the pipeline potential sensor in the station is connected with a regional cathodic protection potentiostat in the station through a lead; the anode of the in-station area cathodic protection potentiostat is connected with the in-station area cathodic protection anode ground bed through a lead, and the cathode of the in-station area cathodic protection potentiostat is connected with the in-station pipeline through a lead;
the off-station pipeline cathodic protection system comprises: the system comprises an out-station pipeline cathodic protection anode ground bed, an out-station pipeline cathodic protection potentiostat and an out-station pipeline potential sensor; the cathodic protection anode ground bed of the pipeline outside the station is buried in soil on one side of the pipeline outside the station; the potential sensor of the pipeline outside the station is connected with the cathodic protection potentiostat of the pipeline outside the station through a lead; the anode of the cathodic protection potentiostat of the pipeline outside the station is connected with a cathodic protection anode ground bed of the pipeline outside the station through a lead, and the cathode of the cathodic protection potentiostat of the pipeline outside the station is connected with the pipeline outside the station through a lead;
the insulated joint cathodic protection system comprises: the device comprises an insulating joint anode ground bed, an insulating joint inner side constant potential rectifier, an insulating joint outer side constant potential rectifier, an insulating joint inner side pipeline potential sensor and an insulating joint outer side pipeline potential sensor; the insulating joint anode ground bed is buried in soil on one side of the insulating joint; the anodes of the potentiostat at the inner side of the insulating joint and the potentiostat at the outer side of the insulating joint are respectively connected with an anode ground bed of the insulating joint through leads; the negative electrode of the constant potential rectifier at the inner side of the insulating joint is connected with the pipeline potential sensor at the inner side of the insulating joint through a lead; the negative electrode of the constant potential rectifier at the outer side of the insulating joint is connected with the pipeline potential sensor at the outer side of the insulating joint through a lead; the pipeline potential sensor at the inner side of the insulating joint is buried in soil at one side of the insulating joint facing the station; and the pipeline potential sensor outside the insulating joint is buried in soil on one side of the insulating joint facing the outside of the station.
By adopting the technical scheme: the two traditional subsections of the cathodic protection of the area in the station and the cathodic protection of the pipeline outside the station are divided into three subsections of the cathodic protection of the area in the station, the cathodic protection of the pipeline outside the station and the cathodic protection of the insulating joint, the pipelines in a certain range on two sides of the insulating joint are independently controlled as an independent section, the distance between the cathodic protection of the area in the station and the cathodic protection of the pipeline outside the station is increased, the cathodic protection of the area in the station and the cathodic protection of the pipeline outside the station are decoupled, the problem of mutual influence is relieved or even eliminated, the processing method is simple, the operation is easy, and the effect is good. The potential of the pipelines at two ends of the insulated joint is controlled by setting the anode ground bed of the insulated joint shared by the two potentiostats, so that the automatic correction of the residual mutual influence of the cathode protection of the in-station area and the cathode protection of the out-station pipeline after decoupling can be realized, and the potential of the pipelines at two ends of the insulated joint can reach the standard.
Preferably, in the above pipe cathodic protection system: the distance between the cathodic protection anode ground bed of the indoor area and the insulating joint is 10-50 m.
By adopting the technical scheme: the interference of the cathodic protection anode ground bed in the area in the station on the pipeline outside the insulated joint can be reduced. When the distance is less than 10 meters, the distance is too close to the insulating joint, the interference is large, and the measurement of the pipeline potential is influenced; when the distance is more than 50 meters, the protection effect is not ideal, and the potential of the pipeline may not meet the standard requirement.
More preferably, in the above-described cathodic protection system for a pipeline: the in-station regional cathodic protection anode ground bed adopts a linear anode or a distributed anode.
By adopting the technical scheme: the interference of the cathodic protection anode ground bed in the area in the station on the pipeline outside the insulated joint can be reduced. The regional cathode protection mainly comprises a deep well anode and a shallow buried anode, a grounding system exists in soil of a station, the deep well anode is adopted, current is mainly absorbed by the grounding system, the potential of a pipeline cannot meet the standard requirement, the linear anode and the distributed anode in the shallow buried anode are adopted, so that the current can be absorbed by the pipeline to the maximum extent, the loss of the current is reduced, and the potential of the pipeline can meet the standard requirement.
Preferably, in the above pipe cathodic protection system: the distance between the potential sensor of the pipeline outside the station and the insulating joint is 50-1000 meters.
By adopting the technical scheme: the interference of the anode-protecting anode ground bed in the area of the station and the protected objects including the pipelines in the station can be avoided. In general, the interference range of regional cathodic protection to the pipeline outside the station is 0-1000 m. The lower limit of the selected distance is 50 meters, so that the potential of the pipeline outside the station is prevented from being interfered by an anode field inside the station, and the upper limit of the selected distance is 1000 meters, so that the condition that the whole potential of the reaction pipeline cannot be accurately measured due to overlarge distance is avoided.
Preferably, in the above pipe cathodic protection system: the distance between the pipeline potential sensor at the inner side of the insulating joint and the distance between the pipeline potential sensor at the outer side of the insulating joint and the insulating joint are respectively 0.5-5 m.
By adopting the technical scheme: so as to accurately measure the potential of the in-station pipe adjacent to the insulated joint. The distance is less than 0.5 meter time. The measured potential of the pipeline is easily interfered by an anode field, the measured potential is more than 5 meters, and the measured potential cannot accurately reflect the real potential at the insulated joint.
Preferably, in the above pipe cathodic protection system: the station inner pipeline potential sensor, the station outer pipeline potential sensor, the insulated joint inner side pipeline potential sensor and the insulated joint outer side pipeline potential sensor are all polarization probe sensors or combined sensors formed by reference electrodes and test pieces.
By adopting the technical scheme: the continuous measurement of the power-off potential of the pipeline can be realized. When the polarized probe sensor or the combined sensor consisting of the reference electrode and the test piece is adopted, the cathode protection current of the pipeline does not need to be cut off, and the power-off potential of the pipeline can be obtained by adopting a test piece method, namely the continuous measurement of the power-off potential of the pipeline is realized.
Based on the above, the present application also discloses a method for protecting a cathode of a pipeline, which comprises the following steps:
s1: setting a target power-off potential of the intra-station area cathode protection potentiostat as Voff1_ c, and continuously detecting the intra-station area cathode protection potentiostat to be Voff1 through the intra-station pipe potential sensor; gradually increasing the output of the in-station area cathode protection potentiostat from zero until Voff1 is Voff1_ c; and the cathode protection of the pipeline in the station reaches the standard.
S2: setting a target power-off potential of the off-station pipeline cathode protection potentiostat as Voff2_ c, continuously detecting the off-station pipeline power-off potential as Voff2 by the off-station pipeline cathode protection potentiostat through an off-station pipeline potential sensor, and gradually increasing the output of the off-station pipeline cathode protection potentiostat from a zero point until Voff2 is Voff2_ c; and the standard of the cathodic protection of the pipeline outside the station is realized.
S3: setting the target power-off potential of the constant potential meter at the inner side of the insulating joint as Voff3_ c, and continuously detecting the power-off potential of the pipeline at the inner side of the insulating joint as Voff3 by the constant potential meter at the inner side of the insulating joint through a pipeline potential sensor at the inner side of the insulating joint, so that the output of the constant potential meter at the inner side of the insulating joint is gradually increased from a zero point until Voff3 is Voff3_ c; and the cathode protection of the in-station pipeline close to the insulated joint reaches the standard.
S4: and setting the target power-off potential of the constant potential meter outside the insulating joint as Voff4_ c, and continuously detecting that the power-off potential of the pipeline outside the insulating joint is Voff4 by the constant potential meter outside the insulating joint through the potential sensor outside the pipeline outside the insulating joint, so that the output of the constant potential meter outside the insulating joint is gradually increased from a zero point until Voff4 is Voff4_ c. And the cathode protection of the pipeline outside the station close to the insulating joint reaches the standard.
Compared with the prior art, the scheme can avoid the mutual interference phenomenon caused by the simultaneous operation of two sets of cathodic protection due to the difference of environments in and out of the station.
Drawings
Fig. 1 is a schematic structural view of embodiment 1.
The correspondence between each reference numeral and the part name is as follows:
11. an intra-station conduit; 12. an insulated joint; 13. an out-of-station pipeline; 21. a cathodic protection anode ground bed in the station area; 22. a cathodic protection potentiostat in the station; 23. an intra-station pipeline potential sensor; 31. the outer pipeline of the station is used for protecting the anode ground bed in a cathode way; 32. A cathodic protection potentiostat of the pipeline outside the station; 33. a potential sensor of the pipeline outside the station; 41. an insulated joint anode ground bed; 42. a constant potential rectifier inside the insulated joint; 43. a constant potential rectifier outside the insulated joint; 44. a pipeline potential sensor at the inner side of the insulated joint; 45. Pipeline potential sensor outside the insulated joint.
Detailed Description
In order to more clearly illustrate the technical solutions of the present application, the following will be further described with reference to various embodiments. It should be noted that the terms "inner", "outer", "upper", "lower", "front", "rear", and the like indicate orientations or positional relationships based on positional relationships 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 specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present application.
A cathodic protection system for a pipeline, comprising: an in-station pipe 11, an insulated joint 12, and an out-station pipe 13 connected in sequence. Further comprising: the system comprises a cathodic protection system of an area in a station, a cathodic protection system of a pipeline outside the station and a cathodic protection system of an insulated joint.
The indoor area cathodic protection system includes: a cathodic protection anode ground bed 21 in a station area, a cathodic protection potentiostat 22 in the station area and a pipeline potential sensor 23 in the station area; the in-station area cathodic protection anode ground bed 21 is buried in soil on one side of the in-station pipeline 11; the in-station pipeline potential sensor 23 is connected with the in-station regional cathodic protection potentiostat 22 through a lead; the anode of the cathodic protection potentiostat 22 in the station is connected with the cathodic protection anode ground bed 21 in the station through a lead, and the cathode is connected with the pipeline 11 in the station through a lead;
the off-station pipeline cathodic protection system comprises: a cathodic protection anode ground bed 31 of the pipeline outside the station, a cathodic protection potentiostat 32 of the pipeline outside the station and a potential sensor 33 of the pipeline outside the station; the cathodic protection anode ground bed 31 of the pipeline outside the station is buried in soil at one side of the pipeline 13 outside the station; the potential sensor 33 of the pipeline outside the station is connected with the cathodic protection potentiostat 32 of the pipeline outside the station through a lead; the anode of the cathodic protection potentiostat 32 of the pipeline outside the station is connected with the cathodic protection anode ground bed 31 of the pipeline outside the station through a lead, and the cathode is connected with the pipeline 13 outside the station through a lead;
the insulated joint cathodic protection system comprises: an insulating joint anode ground bed 41, an insulating joint inner side constant potential rectifier 42, an insulating joint outer side constant potential rectifier 43, an insulating joint inner side pipeline potential sensor 44 and an insulating joint outer side pipeline potential sensor 45; the insulating joint anode ground bed 41 is buried in the soil on one side of the insulating joint 12; the anodes of the insulated joint inner constant potential rectifier 42 and the insulated joint outer constant potential rectifier 43 are respectively connected with an insulated joint anode ground bed 41 through leads; the negative electrode of the constant potential rectifier 42 at the inner side of the insulated joint is connected with the pipeline potential sensor 44 at the inner side of the insulated joint through a lead; the cathode of the constant potential rectifier 43 at the outer side of the insulating joint is connected with the pipeline potential sensor 45 at the outer side of the insulating joint through a lead; the pipeline potential sensor 44 at the inner side of the insulating joint is buried in soil at one side of the insulating joint 12 facing to the station; the insulated joint outer pipe potential sensor 45 is buried in soil on the side of the insulated joint 12 facing the outside of the station.
Wherein: the distance between the cathodic protection anode bed 21 of the in-station area and the insulating joint 12 is 10 meters. The in-station area cathodic protection anode ground bed 21 employs a linear anode. The distance between the potential sensor 33 of the pipeline outside the station and the insulating joint 12 is 50 meters. The distance between the insulating joint inner side pipeline potential sensor 44, the insulating joint outer side pipeline potential sensor 45 and the insulating joint 12 is 0.5 m respectively. The station inner pipeline potential sensor 23, the station outer pipeline potential sensor 33, the insulated joint inner pipeline potential sensor 44 and the insulated joint outer pipeline potential sensor 45 all adopt polarized probe sensors.
In practice, the working process is as follows:
s1: setting the target power-off potential of the station-area cathodic protection potentiostat 22 to be Voff1_ c, and continuously detecting the power-off potential of the station-area cathodic protection potentiostat 22 to be Voff1 by the station-area cathodic protection potentiostat 22 through the station-area pipeline potential sensor 23; gradually increasing the output of the in-station area cathode protection potentiostat 22 from zero until Voff1 becomes Voff1_ c; and the cathode protection of the pipeline in the station reaches the standard.
S2: setting a target power-off potential of the off-station pipeline cathode protection potentiostat 32 as Voff2_ c, continuously detecting the off-station pipeline power-off potential as Voff2 by the off-station pipeline cathode protection potentiostat 32 through an off-station pipeline potential sensor 33, and gradually increasing the output of the off-station pipeline cathode protection potentiostat 32 from a zero point until Voff2 is Voff2_ c; and the standard of the cathodic protection of the pipeline outside the station is realized.
S3: setting the target power-off potential of the constant potentiometer 42 inside the insulating joint as Voff3_ c, and continuously detecting the power-off potential of the pipeline inside the insulating joint as Voff3 by the constant potentiometer 42 inside the insulating joint through the pipeline potential sensor 44 inside the insulating joint, so that the output of the constant potentiometer 42 inside the insulating joint is gradually increased from zero until Voff3 is Voff3_ c; and the cathode protection of the in-station pipeline close to the insulated joint reaches the standard.
S4: the target power-off potential of the insulated joint outer potentiostat 43 is Voff4_ c, and the insulated joint outer potentiostat 43 continuously detects that the insulated joint outer pipe power-off potential is Voff4 through the insulated joint outer pipe potential sensor 45, so that the output of the insulated joint outer potentiostat 43 gradually increases from zero until Voff4 becomes Voff4_ c. And the cathode protection of the pipeline outside the station close to the insulating joint reaches the standard.
The above description is only for the specific embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application are intended to be covered by the scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (6)
1. A cathodic protection system for pipelines comprises an in-station pipeline (11), an insulating joint (12) and an out-station pipeline (13) which are connected in sequence; it is characterized by also comprising:
the system comprises a cathodic protection system of an area in a station, a cathodic protection system of a pipeline outside the station and a cathodic protection system of an insulated joint;
the indoor area cathodic protection system includes: a cathodic protection anode ground bed (21) in the station area, a cathodic protection potentiostat (22) in the station area and a pipeline potential sensor (23) in the station area; the in-station area cathodic protection anode ground bed (21) is buried in soil on one side of the in-station pipeline (11); the in-station pipeline potential sensor (23) is connected with the in-station regional cathodic protection potentiostat (22) through a lead; the anode of the in-station area cathodic protection potentiostat (22) is connected with the in-station area cathodic protection anode ground bed (21) through a lead, and the cathode is connected with the in-station pipeline (11) through a lead;
the off-station pipeline cathodic protection system comprises: a cathodic protection anode ground bed (31) of the pipeline outside the station, a cathodic protection potentiostat (32) of the pipeline outside the station and a potential sensor (33) of the pipeline outside the station; the cathodic protection anode ground bed (31) of the pipeline outside the station is buried in soil on one side of the pipeline (13) outside the station; the potential sensor (33) of the pipeline outside the station is connected with the cathodic protection potentiostat (32) of the pipeline outside the station through a lead; the anode of the cathodic protection potentiostat (32) of the pipeline outside the station is connected with the cathodic protection anode ground bed (31) of the pipeline outside the station through a lead, and the cathode of the cathodic protection potentiostat of the pipeline outside the station is connected with the pipeline outside the station (13) through a lead;
the insulated joint cathodic protection system comprises: an insulating joint anode ground bed (41), an insulating joint inner side constant potential rectifier (42), an insulating joint outer side constant potential rectifier (43), an insulating joint inner side pipeline potential sensor (44) and an insulating joint outer side pipeline potential sensor (45); the insulating joint anode ground bed (41) is buried in soil on one side of the insulating joint (12); the anodes of the insulated joint inner constant potential rectifier (42) and the insulated joint outer constant potential rectifier (43) are respectively connected with an insulated joint anode ground bed (41) through leads; the negative electrode of the potentiostat (42) at the inner side of the insulating joint is connected with the pipeline potential sensor (44) at the inner side of the insulating joint through a lead; the negative electrode of the constant potential rectifier (43) at the outer side of the insulating joint is connected with the pipeline potential sensor (45) at the outer side of the insulating joint through a lead; the pipeline potential sensor (44) at the inner side of the insulating joint is buried in soil at one side, facing the station, of the insulating joint (12); and the pipeline potential sensor (45) outside the insulated joint is buried in soil on one side, facing the outside of the station, of the insulated joint (12).
2. The cathodic protection system for a pipeline as set forth in claim 1, wherein: the distance between the cathodic protection anode ground bed (21) of the indoor area and the insulating joint (12) is 10-50 m.
3. The cathodic protection system for a pipeline as set forth in claim 1, wherein: the in-station regional cathodic protection anode ground bed (21) adopts a linear anode or a distributed anode.
4. The cathodic protection system for a pipeline as set forth in claim 1, wherein: the distance between the potential sensor (33) of the pipeline outside the station and the insulating joint (12) is 50-1000 m.
5. The cathodic protection system for a pipeline as set forth in claim 1, wherein: the distances between the pipeline potential sensor (44) at the inner side of the insulating joint, the pipeline potential sensor (45) at the outer side of the insulating joint and the insulating joint (12) are 0.5-5 m respectively.
6. The cathodic protection system for a pipeline as set forth in claim 1, wherein: the station inner pipeline potential sensor (23), the station outer pipeline potential sensor (33), the insulated joint inner pipeline potential sensor (44) and the insulated joint outer pipeline potential sensor (45) are all polarization probe sensors or combined sensors consisting of reference electrodes and test pieces.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021730537.0U CN212335306U (en) | 2020-08-18 | 2020-08-18 | Pipeline cathodic protection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021730537.0U CN212335306U (en) | 2020-08-18 | 2020-08-18 | Pipeline cathodic protection system |
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| CN212335306U true CN212335306U (en) | 2021-01-12 |
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| CN202021730537.0U Active CN212335306U (en) | 2020-08-18 | 2020-08-18 | Pipeline cathodic protection system |
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