A buried pipeline corrosion control unit systemized detection and evaluation method and device

Abstract

This invention provides a systematic detection and evaluation method and apparatus for corrosion control units in buried pipelines. The method includes: collecting multi-source pipeline data, extracting basic information about the pipeline body and cathodic protection system, and forming a basic ledger of corrosion control units; identifying detection blind spots in pipeline sections based on the basic ledger of corrosion control units and outputting corresponding modification plans; obtaining on-site facility verification results and preliminary test results of the boundary insulation performance of corrosion control units for non-blind spot pipeline sections, respectively obtaining facility verification results and boundary performance test results; and collecting cathodic protection system operating parameters and pipeline corrosion interference parameters based on the facility verification results and boundary performance test results, and comprehensively evaluating the corrosion risk level of the corrosion control unit. This invention achieves a fully closed-loop management of risk rating for corrosion control units in buried pipelines, significantly improving the precision of buried pipeline corrosion management and the accuracy of risk identification.

Description

Technical Field

[0001] This invention relates to the field of buried pipeline risk assessment technology, specifically to a systematic detection and evaluation method and device for buried pipeline corrosion control unit system. Background Technology

[0002] With the rapid advancement of urbanization in my country and the large-scale construction of infrastructure such as subways, high-speed railways, and high-voltage AC transmission lines, the service environment of urban buried gas pipelines (i.e., buried pipelines) is becoming increasingly complex, and new corrosion risks such as stray current interference are rising year by year. Currently, the industry lacks a systematic understanding of the overall corrosion protection status of urban buried gas pipelines and the spatial distribution of high-corrosion-risk points. Although some pipeline operators have begun to explore a corrosion control unit management model based on insulated joints as boundaries, they have only completed preliminary unit division work, and the supporting testing and evaluation system still has significant deficiencies. Existing cathodic protection testing of buried pipelines generally adopts a fragmented single-point potential testing method, with each testing step isolated from the others. A standardized testing process covering the entire life cycle of the corrosion control unit has not been formed, making it easy to miss key corrosion information. Furthermore, a unified standard for defining and identifying blind spots in testing has not been established, leaving many areas without test pile coverage as regulatory gaps, resulting in corrosion hazards not being detected in a timely manner. At the same time, risk level assessment lacks quantitative basis, and subsequent protective measures are insufficiently targeted and effective. These deficiencies are particularly evident in areas with stray current interference in subways, and can no longer meet the urgent needs for the safe and stable operation of urban gas pipeline networks. Summary of the Invention

[0003] In view of the above problems, embodiments of the present invention provide a systematic detection and evaluation method and apparatus for the corrosion control unit of buried pipelines to solve the existing technical problems.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a systematic detection and evaluation method for corrosion control units of buried pipelines, the method comprising the following steps: Collect multi-source pipeline data, extract basic information about the pipeline body and cathodic protection system, and form a basic ledger of corrosion control unit; Based on the basic ledger of corrosion control unit, identify the detection blind spots in the pipe section and output the corresponding renovation plan. Obtain the on-site facility verification results and preliminary test results of the boundary insulation performance of the corrosion control unit for the non-blind spot pipe section. The facility verification results and boundary performance test results are obtained respectively. Based on the facility verification results and boundary performance test results, the operating parameters of the cathodic protection system and pipeline corrosion interference parameters are collected to comprehensively assess the corrosion risk level of the corrosion control unit.

[0005] In one embodiment, the multi-source pipeline data includes GIS maps, survey data, and as-built data; The basic information of the pipeline body includes pipeline length, anti-corrosion coating type, pipe diameter and wall thickness; The basic information of the cathodic protection system includes the cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

[0006] In one embodiment, a pipe segment that meets any of the following conditions is marked as a detection blind zone: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

[0007] In one embodiment, the facility verification results are obtained by checking the non-blind zone pipe sections item by item based on the corrosion control unit basic ledger. The verification contents include cathodic protection method, potentiostat installation position, actual position of test pile, test pile validity and test pile layout spacing. The boundary performance test results were obtained by cross-testing the insulation joint performance of the corrosion control unit boundary using the PCM current method and the potential method.

[0008] In one embodiment, the operating parameters of the cathodic protection system are collected based on the potentiostat data obtained from the facility verification results. The operating parameters of the cathodic protection system include the output voltage, output current, and set potential of the potentiostat. Based on the test piles collected in the facility verification results, the pipeline corrosion interference parameters include the pipeline's natural potential, energized potential, de-energized potential, DC stray current density, and AC stray current density.

[0009] Secondly, the present invention provides a systematic detection and evaluation device for a buried pipeline corrosion control unit, the device comprising: The data extraction module is used to collect multi-source pipeline data, extract basic information about the pipeline body and cathodic protection system, and form a basic ledger of the corrosion control unit. The facility verification module is used to identify detection blind spots in the pipe section based on the basic ledger of the corrosion control unit and output the corresponding renovation plan. It obtains the on-site facility verification results of the non-blind spot pipe section and the preliminary test results of the boundary insulation performance of the corrosion control unit, and obtains the facility verification results and boundary performance test results respectively. The risk assessment module is used to collect operating parameters of the cathodic protection system and pipeline corrosion interference parameters based on facility verification results and boundary performance test results, and to comprehensively assess the corrosion risk level of the corrosion control unit.

[0010] In one embodiment, the multi-source pipeline data in the data extraction module includes GIS maps, measurement data, and as-built data; the basic information of the pipeline body includes pipeline length, anti-corrosion layer type, pipe diameter, and wall thickness; the basic information of the cathodic protection system includes cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

[0011] In one embodiment, the facility verification module detects blind spots in the following manner: The pipe segment that meets any of the following conditions is marked as a detection blind zone: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

[0012] In one embodiment, the facility verification module obtains the facility verification results and boundary performance test results in the following manner: The facility verification results were obtained by checking the non-blind zone pipe sections item by item based on the basic ledger of the corrosion control unit. The verification content included the cathodic protection method, the installation position of the potentiostat, the actual position of the test pile, the validity of the test pile, and the spacing of the test pile. The boundary performance test results were obtained by cross-testing the insulation joint performance of the corrosion control unit boundary using the PCM current method and the potential method.

[0013] In one embodiment, the risk assessment module collects the operating parameters of the cathodic protection system and the pipeline corrosion interference parameters in the following manner: Based on the potentiostat data collected from the facility verification results, the operating parameters of the cathodic protection system are collected. These operating parameters include the output voltage, output current, and set potential of the potentiostat. Based on the test piles collected in the facility verification results, the pipeline corrosion interference parameters include the pipeline's natural potential, energized potential, de-energized potential, DC stray current density, and AC stray current density.

[0014] The beneficial effects of this invention are as follows: This invention constructs a standardized, end-to-end detection system, encompassing the establishment of a basic ledger for corrosion control units, identification of blind spots in the field, boundary performance testing, and comprehensive risk rating based on multiple parameters. This forms a progressive, closed-loop logic, solving the problems of fragmented and disjointed processes in traditional detection methods, and enabling full lifecycle management of corrosion control units. Quantitative judgment based on the basic ledger data of corrosion control units clarifies the identification criteria for detection blind spots, accurately locating regulatory gaps, providing a basis for supplementing detection facilities, and making the risk rating results more comprehensive and objective, thus providing decision support for subsequent corrosion prevention and control. Attached Figure Description

[0015] Figure 1 The diagram shown is a schematic flowchart of a systematic detection and evaluation method for a buried pipeline corrosion control unit according to an embodiment of the present invention. Figure 2 The diagram shown is a flowchart illustrating the principle of a corrosion control unit detection and evaluation method provided in an embodiment of the present invention. Figure 3 The diagram shown is a structural schematic of a systematic detection and evaluation device for a buried pipeline corrosion control unit provided in an embodiment of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer and more understandable, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0017] To address the shortcomings of existing technologies, this invention provides a specific implementation method for a systematic detection and evaluation method for corrosion control units in buried pipelines, such as... Figure 1 and combined Figure 2 As shown, the method specifically includes: S110: Collect multi-source pipeline data, extract basic information about the pipeline body and cathodic protection system, and form a basic ledger of corrosion control unit.

[0018] The multi-source pipeline data includes GIS maps, survey data, and as-built data. The GIS maps mainly include the pipeline's spatial direction, coordinates, burial depth, spatial locations of cathodic protection facilities along the route, and the geographical distribution and distances of interference sources such as surrounding subway lines and high-voltage power lines. The survey data mainly includes measured values ​​of pipeline elevation and burial depth, initial acceptance data of the cathodic protection system, initial insulation performance test data of insulation joints, and coordinates of test pile locations. The as-built data mainly includes construction records of pipeline material, diameter, wall thickness, type and grade of anti-corrosion coating, design and construction records of the cathodic protection system, and a list of completed test pile layouts.

[0019] Basic information about the pipeline body includes pipeline length, type of anti-corrosion coating, pipe diameter and wall thickness; Basic information about a cathodic protection system includes the cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

[0020] Specifically, during the extraction process, spatial consistency verification is first carried out, using the measured coordinates in the measurement data as a benchmark to correct the positional errors in the GIS map files. Then, parameter consistency verification is carried out, marking inconsistent parameters in the three types of data as key points for on-site verification. Finally, the integrated corrosion control unit basic ledger covers pipeline body information such as pipeline length, anti-corrosion layer type, pipe diameter, and wall thickness, as well as cathodic protection system information such as cathodic protection method, deep well anode location or number of sacrificial anodes, location and number of insulating joints, and location and number of test piles.

[0021] This step involves cross-verifying data from multiple sources to create a standardized basic ledger, providing a unified benchmark for subsequent processing. This solves the problems of fragmented and highly biased basic data in traditional testing, ensuring the systematic nature and traceability of the testing work.

[0022] S120: Based on the basic ledger of the corrosion control unit, identify the detection blind spots in the pipe section and output the corresponding renovation plan. Obtain the on-site facility verification results of the non-blind spot pipe section and the preliminary test results of the boundary insulation performance of the corrosion control unit. Obtain the facility verification results and boundary performance test results respectively.

[0023] This step uses the corrosion control unit basic ledger formed in step S121 as input. First, it identifies the detection blind spots in the pipe section, outputs modification suggestions for the blind spots and adds temporary detection points, and then obtains the facility verification results and boundary performance test results for the non-blind spot pipe sections.

[0024] When detecting blind spots, a two-dimensional judgment rule is adopted, which is based on the test pile location, historical test records and interference source distribution data in the corrosion control unit basic ledger.

[0025] Pipe segments that meet any of the following conditions are marked as detection blind zones: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

[0026] For the identified blind spots, two types of solutions are simultaneously provided: permanent renovation and temporary transition. The permanent solution involves adding permanent test piles at the standard spacing and densely deploying stray current monitoring piles in the subway interference section. The temporary solution involves adding temporary detection points in the blind spots to support the current detection work and avoid regulatory vacuum.

[0027] The facility verification results were obtained by checking each non-blind zone pipe section against the basic ledger of the corrosion control unit. The verification content included the cathodic protection method, the installation location of the potentiostat, the actual location of the test piles, the validity of the test piles, and the spacing of the test piles.

[0028] The boundary performance test results were obtained by cross-testing the insulation joint performance at the boundary of the corrosion control unit using the PCM current method and the potential method. Insulation joints are typically located at the junctions of the defined corrosion control units. The PCM current method involves applying a specific frequency AC current signal to one side of the pipe using a transmitter, and detecting the current amplitude along the pipe direction using a receiver. If the insulation joint performs well, the current cannot pass through the insulation interface, and the current on the other side of the joint will show a precipitous drop. The current attenuation rate can be used to quantify the isolation performance. The potential method, also known as the power supply test, involves feeding an electrical signal into the pipe on one side of the insulation joint and measuring the potential to ground on both sides of the joint. If the insulation performance is qualified, there is no electrical path between the two sides, and a significant potential difference exists. The insulation effectiveness can be directly determined by the potential difference.

[0029] This step uses the basic ledger of the corrosion control unit in step S110 as a benchmark to carry out blind zone identification and result acquisition. It clarifies the dual-dimensional quantitative blind zone judgment criteria, fills the technical gap of no unified rules for blind zone identification, and uses two methods to cross-verify boundary performance to avoid the error of a single detection method, ensure the accuracy of the electrical boundary of the corrosion control unit, and provide a reliable data foundation for risk rating.

[0030] S130: Based on the facility verification results and boundary performance test results, collect the operating parameters of the cathodic protection system and the pipeline corrosion interference parameters, and comprehensively evaluate the corrosion risk level of the corrosion control unit. The corrosion risk level is divided into three levels: low risk, medium risk and high risk.

[0031] Based on the results of facility verification, the potentiostat collects the operating parameters of the cathodic protection system. The operating parameters of the cathodic protection system include the output voltage, output current and set potential of the potentiostat, and can simultaneously record the parameter fluctuation range and abnormal alarms.

[0032] Based on the test piles collected from the facility verification results, pipeline corrosion interference parameters are collected. These parameters include the pipeline's natural potential, on-current potential, off-current potential, DC stray current density, and AC stray current density. The natural potential reflects the pipeline's inherent corrosion tendency, the on-current potential reflects the real-time output status of the cathodic protection system, the off-current potential is a criterion for judging the effectiveness of cathodic protection, and the AC / DC stray current density reflects the intensity of stray current interference.

[0033] The risk level assessment takes the effectiveness of the corrosion control unit boundary as a prerequisite, the effectiveness of cathodic protection as the main evaluation dimension, the stray current interference intensity as the superimposed risk dimension, and the blind zone ratio as the correction dimension, and is comprehensively divided into three levels: low, medium and high.

[0034] More specifically, the following rules can be followed when classifying risk levels: The low-risk corrosion control unit corresponds to qualified insulation joint performance, normal operation of the potentiostat, all test pile de-energized potentials within the standard protection range, stray current density below the risk threshold, no detection blind spots or extremely low blind spot ratio, and overall corrosion risk is controllable. The insulation joints of the medium-risk corrosion control unit have slight performance degradation, the fluctuation of the potentiostat parameters does not exceed the set threshold, the potential of some test piles is close to the protection threshold, the stray current is close to the risk threshold, and there are a few detection blind spots. Targeted rectification and increased monitoring are required. High-risk corrosion control units are characterized by issues such as insulated joint failure, potentiostat malfunction or abnormal output (exceeding the set threshold), pipeline potential significantly deviating from the protection threshold, stray current far exceeding the threshold, and large-area detection blind spots, indicating significant corrosion risks that require immediate remediation.

[0035] The aforementioned ranges, thresholds, number and proportion of blind spots can be adjusted based on the actual operating conditions of buried pipelines.

[0036] This step conducts a coupled evaluation of buried pipelines from multiple dimensions, breaking through the limitations of traditional single-point parameter evaluation. At the same time, it introduces the proportion of detection blind spots, fully considering the impact of unknown risks on the overall evaluation. The rating results are more in line with the actual service status of buried pipelines, and can provide accurate hierarchical control basis for subsequent protection and management.

[0037] Based on the same inventive concept, this application also provides a systematic detection and evaluation device for buried pipeline corrosion control units, which can be used to implement the systematic detection and evaluation method for buried pipeline corrosion control units described in the above embodiments, as described in the following embodiments. Since the principle and method of solving the problem are similar, the implementation of the device can refer to the method implementation, and repeated details will not be repeated. The terms "unit" or "module" used below can refer to a combination of software and / or hardware that performs a predetermined function. Although the system described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0038] This invention provides a systematic detection and evaluation device for the corrosion control unit of buried pipelines, such as... Figure 3 As shown. In Figure 3 The device includes: Data extraction module 210 is used to collect multi-source pipeline data, extract basic information of the pipeline body and cathodic protection system, and form a basic ledger of corrosion control unit; The facility verification module 220 is used to identify detection blind spots in the pipe section based on the basic ledger of the corrosion control unit and output the corresponding renovation plan, obtain the on-site facility verification results of the non-blind spot pipe section and the preliminary test results of the boundary insulation performance of the corrosion control unit, and obtain the facility verification results and boundary performance test results respectively. The risk assessment module 230 is used to collect operating parameters of the cathodic protection system and pipeline corrosion interference parameters based on facility verification results and boundary performance test results, and to comprehensively assess the corrosion risk level of the corrosion control unit.

[0039] In one embodiment of the present invention, the multi-source pipeline data in the data extraction module 210 includes GIS maps, measurement data and as-built data; the basic information of the pipeline body includes pipeline length, anti-corrosion layer type, pipe diameter and wall thickness; the basic information of the cathodic protection system includes cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

[0040] In one embodiment of the present invention, the facility verification module 220 detects blind spots in the following manner: Pipe segments that meet any of the following conditions are marked as detection blind zones: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

[0041] In one embodiment of the present invention, the facility verification module 220 obtains the facility verification results and boundary performance test results in the following manner: The facility verification results were obtained by checking each item of the non-blind zone pipe section based on the basic ledger of the corrosion control unit. The verification content included cathodic protection method, installation location of potentiostat, actual location of test pile, validity of test pile and spacing of test pile; The boundary performance test results were obtained by cross-testing the insulation joint performance at the boundary of the corrosion control unit using the PCM current method and the potential method.

[0042] In one embodiment of the present invention, the risk assessment module 230 collects the operating parameters of the cathodic protection system and the pipeline corrosion interference parameters in the following manner: Based on the results of facility verification, the operating parameters of the cathodic protection system are collected by the potentiostat. The operating parameters of the cathodic protection system include the output voltage, output current and set potential of the potentiostat. Based on the test piles collected from the facility verification results, pipeline corrosion interference parameters are collected. These parameters include the pipeline's natural potential, on-current potential, off-current potential, DC stray current density, and AC stray current density.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A systematic detection and evaluation method for corrosion control units of buried pipelines, characterized in that: The method includes the following steps: Collect multi-source pipeline data, extract basic information about the pipeline body and cathodic protection system, and form a basic ledger of corrosion control unit; Based on the basic ledger of corrosion control unit, identify the detection blind spots in the pipe section and output the corresponding renovation plan. Obtain the on-site facility verification results and preliminary test results of the boundary insulation performance of the corrosion control unit for the non-blind spot pipe section. The facility verification results and boundary performance test results are obtained respectively. Based on the facility verification results and boundary performance test results, the operating parameters of the cathodic protection system and the pipeline corrosion interference parameters are collected to comprehensively assess the corrosion risk level of the corrosion control unit.

2. The systematic detection and evaluation method for a buried pipeline corrosion control unit as described in claim 1, characterized in that: The multi-source pipeline data includes GIS maps, survey data, and as-built data; The basic information of the pipeline body includes pipeline length, anti-corrosion coating type, pipe diameter and wall thickness; The basic information of the cathodic protection system includes the cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

3. The systematic detection and evaluation method for a buried pipeline corrosion control unit as described in claim 2, characterized in that: The pipe segment that meets any of the following conditions is marked as a detection blind zone: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

4. The systematic detection and evaluation method for a buried pipeline corrosion control unit as described in claim 1, characterized in that: The facility verification results were obtained by checking the non-blind zone pipe sections item by item based on the basic ledger of the corrosion control unit. The verification content included the cathodic protection method, the installation position of the potentiostat, the actual position of the test pile, the validity of the test pile, and the spacing of the test pile. The boundary performance test results were obtained by cross-testing the insulation joint performance of the corrosion control unit boundary using the PCM current method and the potential method.

5. The systematic detection and evaluation method for the corrosion control unit of buried pipelines according to claim 1, characterized in that: Based on the potentiostat data collected from the facility verification results, the operating parameters of the cathodic protection system are collected. These operating parameters include the output voltage, output current, and set potential of the potentiostat. Based on the test piles collected in the facility verification results, the pipeline corrosion interference parameters include the pipeline's natural potential, energized potential, de-energized potential, DC stray current density, and AC stray current density.

6. A systematic detection and evaluation device for a buried pipeline corrosion control unit, characterized in that: The device includes: The data extraction module is used to collect multi-source pipeline data, extract basic information about the pipeline body and cathodic protection system, and form a basic ledger of the corrosion control unit. The facility verification module is used to identify detection blind spots in the pipe section based on the basic ledger of the corrosion control unit and output the corresponding renovation plan. It obtains the on-site facility verification results of the non-blind spot pipe section and the preliminary test results of the boundary insulation performance of the corrosion control unit, and obtains the facility verification results and boundary performance test results respectively. The risk assessment module is used to collect operating parameters of the cathodic protection system and pipeline corrosion interference parameters based on facility verification results and boundary performance test results, and to comprehensively assess the corrosion risk level of the corrosion control unit.

7. The systematic detection and evaluation device for a buried pipeline corrosion control unit as described in claim 6, characterized in that: The multi-source pipeline data in the data extraction module includes GIS maps, measurement data, and as-built data; the basic information of the pipeline body includes pipeline length, anti-corrosion layer type, pipe diameter, and wall thickness; the basic information of the cathodic protection system includes cathodic protection method, anode facility parameters, location and number of insulating joints, and location and number of test piles.

8. The systematic detection and evaluation device for a buried pipeline corrosion control unit as described in claim 6, characterized in that: The facility verification module detects blind spots in the following way: The pipe segment that meets any of the following conditions is marked as a detection blind zone: Pipe sections with an adjacent test pile spacing greater than 500m and no corresponding historical test records; Pipe sections within 50m of subway lines and not covered by test piles.

9. The systematic detection and evaluation device for a buried pipeline corrosion control unit as described in claim 6, characterized in that: The facility verification module obtains facility verification results and boundary performance test results in the following manner: The facility verification results were obtained by checking the non-blind zone pipe sections item by item based on the basic ledger of the corrosion control unit. The verification content included the cathodic protection method, the installation position of the potentiostat, the actual position of the test pile, the validity of the test pile, and the spacing of the test pile. The boundary performance test results were obtained by cross-testing the insulation joint performance of the corrosion control unit boundary using the PCM current method and the potential method.

10. A systematic detection and evaluation device for a buried pipeline corrosion control unit as described in claim 6, characterized in that: The risk assessment module collects the operating parameters of the cathodic protection system and the pipeline corrosion interference parameters in the following ways: Based on the potentiostat data collected from the facility verification results, the operating parameters of the cathodic protection system are collected. These operating parameters include the output voltage, output current, and set potential of the potentiostat. Based on the test piles collected in the facility verification results, the pipeline corrosion interference parameters include the pipeline's natural potential, energized potential, de-energized potential, DC stray current density, and AC stray current density.

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