Dynamic stray current interference corrosion risk assessment method for buried steel pipeline, electronic equipment and medium

Abstract

The invention discloses a dynamic stray current interference corrosion risk assessment method for a buried steel pipeline, electronic equipment and a medium. The method comprises the following steps: collecting stray current interference field parameters; establishing a pipe-to-ground potential offset time proportion model, and calculating time proportions of different offset thresholds; determining a first risk level according to the time ratio of different offset thresholds; calculating an average alternating current density through a dynamic integration algorithm, and further determining a second risk level; and determining a final corrosion risk through a worst principle according to the first risk level and the second risk level. According to the method, a basis is provided for corrosion risk assessment and hazard identification of the buried steel pipeline under dynamic stray current interference, so that the operation safety of the pipeline is ensured.

Description

Technical Field

[0001] The present invention relates to the field of corrosion evaluation and risk assessment of buried steel pipelines, and more specifically, to a method, an electronic device and a medium for dynamically evaluating the corrosion risk of stray current interference of buried steel pipelines. Background Art

[0002] As an important carrier for energy transportation (such as oil, natural gas, etc.) and urban infrastructure construction (such as water supply and drainage pipelines), the safe and stable operation of buried steel pipelines is of crucial importance. However, during the service process of pipelines, they will inevitably be interfered by stray currents.

[0003] Stray currents have a wide range of sources, such as urban rail transit systems, intercity electrified railways, power generation plants, high-voltage transmission and transformation lines, etc. During the operation of these facilities, the leaked stray currents will enter the soil environment, thereby causing corrosion of the pipelines. The inspection results of buried oil and gas pipelines show that there are many complex interference situations on site: there are both AC interference and DC interference (AC-DC hybrid interference) on the pipelines; there are both static interference and dynamic interference (static-dynamic hybrid interference); even AC-DC interference and static-dynamic interference exist simultaneously. The dynamic stray current interference poses a great hidden danger to the safe operation of pipelines.

[0004] Regarding dynamic interference, many problems and disputes have emerged in the existing stray current interference testing methods and evaluation methods, bringing uncertainty to the evaluation of interference degree and the formulation of protection measures. When the pipeline corrosion rate data cannot be obtained, it becomes extremely difficult to accurately evaluate the corrosion risk caused by stray current interference to the pipeline. Traditional evaluation methods often rely on a single parameter and have obvious limitations. For example, some methods only infer the corrosion risk by measuring the potential change at a certain position of the pipeline. However, the soil environment around the pipeline is complex and changeable, and the stray current distribution at different positions is uneven. The potential at a single position cannot comprehensively reflect the overall corrosion situation. Moreover, some existing evaluation methods ignore the dynamic time-varying characteristics of stray currents. In practice, the magnitude and direction of stray currents will change continuously over time, and dynamic interference can cause pulsed currents, making it difficult for the evaluation method based on static measurement data to accurately evaluate the real-time corrosion risk of the pipeline.

[0005] Dynamic interference causes significant fluctuations in the pipe-to-soil potential of pipelines. However, there is currently no unified understanding of its impact on the effectiveness of cathodic protection and the risk of pipeline corrosion failure. At present, two indicators, namely potential offset and potential gradient, are mainly used in China to determine and evaluate DC interference, and the AC interference is generally evaluated by the AC current density. However, in fact, under the interference of dynamic stray current, the influencing factors during potential and current measurement are complex, and relying on static data often leads to misjudgment. At present, there are no targeted standards or specifications for reference in the monitoring, detection, evaluation methods and prevention and control measures for the influence degree of dynamic stray current interference. There is a lack of in-depth analysis and effective evaluation means for this key factor of dynamic stray current interference.

[0006] In summary, the existing corrosion risk assessment methods and patented technologies are not accurate and comprehensive enough for the corrosion risk assessment under complex stray current, especially dynamic stray current interference. In particular, for the most important evaluation indicators, namely pipe-to-soil potential and AC current density, there is a lack of calculation methods that can effectively consider their dynamic changes.

[0007] Therefore, it is necessary to develop a method, an electronic device and a medium for evaluating the corrosion risk of buried steel pipelines under dynamic stray current interference.

[0008] The information disclosed in the background art section of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of implication that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0009] The present invention provides a method, an electronic device and a medium for evaluating the corrosion risk of buried steel pipelines under dynamic stray current interference. It adopts a dual-mode dynamic interference evaluation system, which can accurately reflect the time-varying characteristics of dynamic interference, effectively evaluate the corrosion risk of pipelines under dynamic stray current interference, and improve the safety and reliability of buried steel pipelines.

[0010] In a first aspect, an embodiment of the present disclosure provides a method for evaluating the corrosion risk of buried steel pipelines under dynamic stray current interference, including:

[0011] Collect on-site parameters of stray current interference;

[0012] Establish a time proportion model of pipe-to-soil potential offset and calculate the time proportion of different offset thresholds;

[0013] Determine the first risk level according to the time proportion of different offset thresholds;

[0014] Calculate the average AC current density through a dynamic integral algorithm, and then determine the second risk level;

[0015] According to the first risk level and the second risk level, the final corrosion risk is determined by the worst-case principle.

[0016] Preferably, the stray current interference on-site parameters include the pipe-to-soil potential and the alternating current density.

[0017] Preferably, the time ratios of different offset thresholds are as follows:

[0018]

[0019] where T is the total test time, t1 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p k1 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p t2 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p +50 mV, k2 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p +50 mV, t3 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p +100 mV, k3 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p +100 mV.

[0020] Preferably, determining the first risk level according to the time ratios of different offset thresholds includes:

[0021] If at least any one of k1≥20%, k2≥15%, k3≥5% is satisfied, the first risk level is high;

[0022] If k1<5% and k2<2% and k3<1%, the first risk level is low;

[0023] In other cases, the first risk level is medium.

[0024] Preferably, the average alternating current density is:

[0025]

[0026] where Q is the total alternating current quantity flowing through the test piece during the test time, T is the total test time, i(t) is the alternating current density obtained by the test, and i AC is the average alternating current density.

[0027] Preferably, determining the second risk level includes:

[0028] If i AC <30 A / m 2 , the second risk level is low;

[0029] If 30 A / m 2 ≤ i AC <100 A / m 2 , then the second risk level is medium;

[0030] If i AC ≥ 100 A / m 2 , then the second risk level is high.

[0031] Preferably, according to the first risk level and the second risk level, determining the final corrosion risk by the worst-case principle includes:

[0032] If the first risk level is high and / or the second risk level is high, then the final corrosion risk is high;

[0033] If the second risk level is low and the second risk level is low, then the final corrosion risk is low;

[0034] In other cases, the final corrosion risk is medium.

[0035] In a second aspect, an embodiment of the present disclosure further provides an electronic device, which includes:

[0036] A memory storing executable instructions;

[0037] A processor, the processor running the executable instructions in the memory to implement the dynamic stray current interference corrosion risk assessment method for buried steel pipelines as described above.

[0038] In a third aspect, an embodiment of the present disclosure further provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it implements the dynamic stray current interference corrosion risk assessment method for buried steel pipelines as described above.

[0039] The method and device of the present invention have other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent specific embodiments, or will be described in detail in the accompanying drawings incorporated herein and the subsequent specific embodiments, and these drawings and specific embodiments are jointly used to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] By describing the exemplary embodiments of the present invention in more detail in conjunction with the accompanying drawings, the above and other objects, features, and advantages of the present invention will become more obvious, wherein, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0041] Figure 1The flowchart shows the steps of a method for evaluating the risk of dynamic stray current interference corrosion of buried steel pipelines according to an embodiment of the present invention.

[0042] Figure 2 The schematic diagram shows typical results of the monitoring part of the pipeline-to-soil potential at the No. 93 test pile of a certain natural gas pipeline of Sinopec according to an embodiment of the present invention.

[0043] Figure 3 The schematic diagram shows typical results of the monitoring part of the alternating current density at the No. 93 test pile of a certain natural gas pipeline of Sinopec according to an embodiment of the present invention.

[0044] Figure 4 The schematic diagram shows the proportion of different offset times of the pipeline-to-soil potential at the No. 93 test pile of a certain natural gas pipeline of Sinopec according to an embodiment of the present invention. Detailed implementation manners

[0045] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0046] Figure 1 The flowchart shows the steps of a method for evaluating the risk of dynamic stray current interference corrosion of buried steel pipelines according to an embodiment of the present invention.

[0047] As Figure 1 shown, the method for evaluating the risk of dynamic stray current interference corrosion of the buried steel pipeline includes:

[0048] Step 101, collecting on-site parameters of stray current interference;

[0049] Step 102, establishing a pipeline-to-soil potential offset time ratio model and calculating the time proportion of different offset thresholds;

[0050] Step 103, determining the first risk level according to the time proportion of different offset thresholds;

[0051] Step 104, calculating the average alternating current density through a dynamic integral algorithm, and then determining the second risk level;

[0052] Step 105, determining the final corrosion risk according to the first risk level and the second risk level through the worst principle.

[0053] In one example, the on-site parameters of stray current interference include pipeline-to-soil potential and alternating current density.

[0054] In one example, the time proportion of different offset thresholds is:

[0055]

[0056] Among them, T is the total test time, t1 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p and k1 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p ; t2 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV, and k2 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV; t3 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV, and k3 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV.

[0057] In one example, determining the first risk level according to the time proportion of different offset thresholds includes:

[0058] If at least any one of k1≥20%, k2≥15%, k3≥5% is met, the first risk level is high;

[0059] If k1<5% and k2<2% and k3<1%, the first risk level is low;

[0060] In other cases, the first risk level is medium.

[0061] In one example, the average alternating current density is:

[0062]

[0063] Among them, Q is the total alternating current quantity flowing through the test piece during the test time, T is the total test time, i(t) is the alternating current density obtained by the test, and i AC is the average alternating current density.

[0064] In one example, determining the second risk level includes:

[0065] If i AC <30 A / m 2 , the second risk level is low;

[0066] If 30 A / m 2 ≤i AC <100 A / m 2 , the second risk level is medium;

[0067] If i AC ≥100 A / m 2 , the second risk level is high.

[0068] In one example, determining the final corrosion risk according to the first risk level and the second risk level through the worst-case principle includes:

[0069] If the first risk level is high and / or the second risk level is high, the final corrosion risk is high;

[0070] If the second risk level is low and the second risk level is low, the final corrosion risk is low;

[0071] In other cases, the final corrosion risk is medium.

[0072] Specifically, the dual-modal dynamic evaluation system of the present invention includes a pipeline-ground potential offset time ratio model and an average alternating current density dynamic integration algorithm. The pipeline-ground potential offset can characterize the tendency of stray current electrochemical corrosion, the alternating current density can reflect the intensity of alternating electric field-induced corrosion, and the proportion of interference time can show the persistence of dynamic impact. This method breaks through the limitations of static evaluation, sets three-level composite threshold conditions, and uses the worst-case principle for comprehensive evaluation of pipeline corrosion risk.

[0073] The present invention will not elaborate on collecting on-site parameters of stray current interference using existing general equipment and methods. The collected parameters should at least include the pipeline-ground potential and the alternating current density, both of which are continuous test values not less than 24 hours within the representative time of dynamic interference.

[0074] The pipeline-ground potential offset time ratio model calculates the offset of the pipeline-ground potential E relative to the minimum cathodic protection potential E p (GB / T21448-2017 4.4.2), and statistically calculates the time ratio of different offset thresholds. Different ratios correspond to different dynamic DC interference corrosion risks:

[0075]

[0076] Among them, T is the total test time, t1 is the cumulative time when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p , k1 is the time ratio when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p , t2 is the cumulative time when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV, k2 is the time ratio when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV, t3 is the cumulative time when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV, and k3 is the time ratio when the pipeline-ground potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV.

[0077] Determine the first risk level according to the time proportion of different offset thresholds; if at least any one of k1≥20%, k2≥15%, k3≥5% is met, the first risk level is high; if k1<5% and k2<2% and k3<1%, the first risk level is low; in other cases, the first risk level is medium.

[0078] The average alternating current density dynamic integration algorithm integrates the alternating current measured by the polarization specimen over the test time to obtain the total alternating current passing through the specimen during the test time, and then divides it by the test time to calculate the average current density to reflect the time-varying characteristics of the dynamic alternating current interference:

[0079]

[0080] Among them, Q is the total alternating current passing through the specimen during the test time, T is the total test time, i(t) is the alternating current density obtained by the test, and i AC is the average alternating current density obtained by the dynamic integration algorithm. Determine the second risk level: if i AC <30A / m 2 , the second risk level is low; if 30A / m 2 ≤i AC <100A / m 2 , the second risk level is medium; if i AC ≥100A / m 2 , the second risk level is high.

[0081] According to the first risk level and the second risk level, determine the final corrosion risk through the worst-case principle, including: if the first risk level is high and / or the second risk level is high, the final corrosion risk is high; if the second risk level is low and the second risk level is low, the final corrosion risk is low; in other cases, the final corrosion risk is medium.

[0082] The present invention also provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the above-mentioned method for evaluating the dynamic stray current interference corrosion risk of buried steel pipelines.

[0083] The present invention also provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, it implements the above-mentioned method for evaluating the dynamic stray current interference corrosion risk of buried steel pipelines.

[0084] To facilitate the understanding of the solutions and effects of the embodiments of the present invention, three specific application examples are given below. Those skilled in the art should understand that this example is only for facilitating the understanding of the present invention, and any specific details are not intended to limit the present invention in any way.

[0085] Example 1

[0086] Taking a natural gas pipeline of a certain Sinopec company as an example, a dynamic stray current interference corrosion risk assessment is carried out.

[0087] 1. Test Object and Environment

[0088] The buried steel natural gas pipeline is made of L390 spiral submerged arc welding. Along this pipeline, it crosses or runs parallel to multiple electrified railway and subway lines, with obvious characteristics of dynamic stray current interference. The daily train operation time is from 6:00 to 24:00.

[0089] 2. On-site Data Collection

[0090] The distance between the No. 93 test pile of a certain natural gas pipeline of Sinopec and a certain subway line is 6.8 km, and the straight-line distance from a certain high-speed railway line is 390 m. The cathodic protection parameters and stray current interference parameters of the pipeline at this location are continuously monitored for 24 hours.

[0091] Figure 2 The figure shows a schematic diagram of typical results of the pipeline-to-soil potential monitoring part at the No. 93 test pile of a certain natural gas pipeline of Sinopec according to an embodiment of the present invention.

[0092] The pipeline-to-soil potential monitored at the No. 93 test pile is as Figure 2 shown. The interference has the characteristics of dynamic fluctuation. During the train operation period (6:00–23:00), the interference is severe: the pipeline-to-soil potential shows dynamic fluctuation, and the fluctuation range reaches 5 V; when the train stops operating at night (23:00–6:00), the interference basically disappears: the pipeline-to-soil potential is relatively stable.

[0093] Figure 3 The figure shows a schematic diagram of typical results of the alternating current density monitoring part at the No. 93 test pile of a certain natural gas pipeline of Sinopec according to an embodiment of the present invention.

[0094] The alternating current density of the pipeline monitored at the No. 93 test pile is as Figure 3 shown. During the day (6:00–22:00), the highest alternating current density reaches 31 A / m 2 ; occasional interference pulses appear at night (22:00–5:00). The AC interference corresponds to the process of the train passing by the pipeline test pile. When the train approaches the pipeline, the interference amplitude rises, and when it leaves, the interference drops rapidly. An AC pulse peak appears every time the train passes by.

[0095] 3. Dynamic Interference Evaluation Process

[0096] Step 1: Calculation of the time proportion of pipeline-to-soil potential offset

[0097] Determine the minimum cathodic protection potential E in this environment according to GB / T 21448-2017 p=-850 mV (CSE). From the pipeline-to-soil potential data obtained through on-site monitoring, the duration of potential offset is statistically analyzed. Specific method: For the pipeline-to-soil potential E at each time point, if E is positive with respect to E p , then this time point is included in the statistical range of t1; if E is positive with respect to E p + 50 mV, then this time point is included in the statistical range of t2; if E is positive with respect to E p + 100 mV, then this time point is included in the statistical range of t3. After the statistics are completed, calculate the time proportion of different offset thresholds:

[0098] t1 (E is positive with respect to E p = -850 mV) accumulates for 9.566 hours, k1 = 39.86%;

[0099] t2 (E is positive with respect to E p + 50 mV = -800 mV) accumulates for 8.817 hours, k2 = 36.74%;

[0100] t3 (E is positive with respect to E p + 100 mV = -750 mV) accumulates for 7.956 hours, k3 = 33.15%.

[0101] Figure 4 Fig. shows the schematic diagram of the proportion of different offset times of the pipeline-to-soil potential at the No. 93 test pile of a natural gas pipeline of Sinopec according to an embodiment of the present invention.

[0102] The summary of the proportion of different offset times of the pipeline-to-soil potential is shown in Figure 4 , which intuitively shows the proportion of the time of the pipeline-to-soil potential with respect to different offset thresholds of the minimum cathodic protection potential, and helps to analyze the risk of dynamic DC interference corrosion.

[0103] Step 2: Dynamic integral calculation of average AC current density

[0104] The test time is 24 h. The average AC current density dynamic integral algorithm is used to integrate the measured AC current over the test time to obtain the total AC charge flowing through the test piece during the test time, and then divide by the test time to calculate the average current density. The specific calculation process is as follows: First, arrange the measured AC current density data in chronological order, and use the numerical integration method to integrate the AC current density curve to obtain the total AC charge Q flowing through the test piece during the test time, and then divide by the test time to calculate the average current density. The obtained average AC current density is 18.35 A / m 2 .

[0105]

[0106] Step 3: Risk determination through Table 1.

[0107] Table 1

[0108]

[0109] Step 4: Comprehensive determination of corrosion risk based on the worst-case principle

[0110] When high threshold levels (k1≥20%, k2≥15%, k3≥5%) appear in the pipe-to-soil potential offset time ratio parameters, it is directly determined as a high corrosion risk according to the composite criterion. This is because the pipe-to-soil potential offset time ratio reflects the tendency of stray current electrochemical corrosion. When this parameter shows a high threshold, it indicates that the possibility of electrochemical corrosion of the pipeline under dynamic stray current interference is relatively large. Even if the average alternating current density is in the low threshold range, the corrosion risk brought by the pipe-to-soil potential offset cannot be ignored. This determination result prompts the pipeline management department to take corresponding protective measures in a timely manner, such as adjusting the cathodic protection parameters, increasing drainage devices, etc., to reduce the corrosion risk of the pipeline and ensure the safe operation of the pipeline.

[0111] The present invention uses bimodal parameter collaborative analysis, integral algorithm to smooth pulses, and time ratio to quantify risks, breaking through the limitations of traditional static instantaneous measurement values for evaluating the corrosion risk of pipelines under stray current interference, realizing the monitoring of the time-varying characteristics of multi-factor dynamic interference, and greatly improving the accuracy and applicability of pipeline corrosion risk assessment under this working condition.

[0112] Example 2

[0113] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the above method for evaluating the corrosion risk of buried steel pipelines under dynamic stray current interference.

[0114] The electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0115] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc.

[0116] The processor may be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions. In an embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.

[0117] Those skilled in the art should understand that, in order to solve the technical problem of how to obtain a good user experience effect, known structures such as communication buses and interfaces may also be included in this embodiment, and these known structures should also be included in the protection scope of the present disclosure.

[0118] For a detailed description of this embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, and details will not be repeated here.

[0119] Example 3

[0120] An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, it implements the method for evaluating the risk of dynamic stray current interference corrosion of buried steel pipelines described above.

[0121] According to the computer-readable storage medium of the embodiment of the present disclosure, non-temporary computer-readable instructions are stored thereon. When the non-temporary computer-readable instructions are run by a processor, all or part of the steps of the methods of the foregoing embodiments of the present disclosure are executed.

[0122] The above computer-readable storage media include but are not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0123] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any example given.

[0124] The above embodiments of the present invention have been described. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments.

Claims

1. A method for evaluating the risk of dynamic stray current interference corrosion of buried steel pipelines, characterized in that, Including: Collecting on-site parameters of stray current interference; Establishing a time proportion model of pipeline-ground potential offset and calculating the time proportion of different offset thresholds; Determining a first risk level according to the time proportion of the different offset thresholds; Calculating the average alternating current density through a dynamic integration algorithm, and further determining a second risk level; Determining the final corrosion risk according to the first risk level and the second risk level through the worst-case principle.

2. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 1, wherein, The on-site parameters of stray current interference include pipeline-ground potential and alternating current density.

3. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 1, wherein, The time proportion of different offset thresholds is: Among them, T is the total test time, t1 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p , k1 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p , t2 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV, k2 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 50 mV, t3 is the cumulative time when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV, k3 is the time ratio when the pipe-to-soil potential E is positive with respect to the minimum cathodic protection potential E p + 100 mV.

4. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 3, wherein, Determining the first risk level according to the time proportion of the different offset thresholds includes: If at least any one of k1≥20%, k2≥15%, and k3≥5% is met, the first risk level is high; If k1<5%, k2<2%, and k3<1%, the first risk level is low; In other cases, the first risk level is medium.

5. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 4, wherein, The average alternating current density is: Where Q is the total alternating current passing through the test piece during the test time, T is the total test time, i(t) is the alternating current density obtained from the test, and i AC is the average alternating current density.

6. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 5, wherein, Determining the second risk level includes: If i AC < 30 A / m 2 , then the second risk level is low; If 30 A / m 2 ≤ i AC < 100 A / m 2 , then the second risk level is medium; If i AC ≥100 A / m 2 , then the second risk level is high.

7. The dynamic stray current interference corrosion risk assessment method for buried steel pipelines according to claim 6, wherein, Determining the final corrosion risk according to the first risk level and the second risk level through the worst-case principle includes: If the first risk level is high and / or the second risk level is high, the final corrosion risk is high; If the first risk level is low and the second risk level is low, the final corrosion risk is low; In other cases, the final corrosion risk is medium.

8. An electronic device, characterized in that, The electronic device includes: A memory storing executable instructions; A processor that runs the executable instructions in the memory to implement the method for evaluating the dynamic stray current interference corrosion risk of a buried steel pipeline according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the method for evaluating the dynamic stray current interference corrosion risk of a buried steel pipeline according to any one of claims 1-7.

Images