CN111220536A - Method, device and system for detecting corrosion probability of pipeline - Google Patents
Method, device and system for detecting corrosion probability of pipeline Download PDFInfo
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Abstract
The application discloses a method, a device and a system for detecting pipeline corrosion probability, and belongs to the technical field of pipelines. Electrically connecting the pipeline to be detected with a detection electrode so as to enable the potential of the detection electrode to be the same as that of the pipeline to be detected; periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode; when the detection electrode is disconnected with the pipeline to be detected, detecting an electric signal of the detection electrode; and determining the corrosion probability of the detection electrode according to the detected electric signal. The problem of confirm the required longer time of metal corrosion probability among the correlation technique has been solved to this application, and this application is used for pipeline corrosion probability's detection.
Description
Technical Field
The present disclosure relates to the field of pipeline technologies, and in particular, to a method, an apparatus, and a system for detecting a corrosion probability of a pipeline.
Background
When trains such as subways and light rails normally run, stray current can leak into a track bed and soil around the track bed through the rails, so that interference is caused to adjacent buried oil and gas pipelines, corrosion of the oil and gas pipelines is accelerated, and safety accidents such as oil and gas leakage and even pipeline explosion are caused.
In the related art, the corrosion probability of the pipe can be determined by determining the corrosion rate of a metal coupon buried in the vicinity of the pipe. For example, in determining the probability of corrosion of a pipe, a worker typically first digs a metal coupon from the vicinity of the pipe. Then, the worker can calculate the corrosion rate of the metal test piece according to the variation of the weight and the surface area of the metal test piece, the density of the metal test piece and the time length of the metal test piece buried in the stratum. Finally, the worker can determine the corrosion probability of the pipeline according to the corrosion rate of the metal test piece.
Since the worker needs to dig the metal coupon out of the ground layer where the pipe is located before determining the corrosion rate of the metal coupon in the related art, and the pipe is usually buried in a deeper ground layer, the time required for determining the metal corrosion probability in the related art is long.
Disclosure of Invention
The application provides a method, a device and a system for detecting the corrosion probability of a pipeline, which can solve the problem that the time required for determining the corrosion probability of metal in the related technology is long, and the technical scheme is as follows:
in one aspect, a method for detecting a probability of corrosion of a pipeline is provided, where the method is used for a detection device in a detection system for a probability of corrosion of a pipeline, and the detection system for a probability of corrosion of a pipeline further includes: the detection device comprises a detection electrode, a pipeline to be detected, wherein the detection electrode is electrically connected with the detection device, the detection electrode and the pipeline to be detected are both positioned in a stratum, the distance between the target position where the detection electrode is positioned and the pipeline to be detected is smaller than a first distance threshold value, the detection electrode is made of the same material as that of the pipeline to be detected, and the method comprises the following steps:
electrically connecting the pipeline to be detected with a detection electrode so as to enable the potential of the detection electrode to be the same as that of the pipeline to be detected;
periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode;
when the detection electrode is disconnected with the pipeline to be detected, detecting an electric signal of the detection electrode;
and determining the corrosion probability of the detection electrode according to the detected electric signal.
Optionally, when the detection electrode is disconnected from the pipe to be detected, detecting an electrical signal of the detection electrode includes:
periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
determining a probability of corrosion of the detection electrode based on the detected electrical signal, comprising:
determining a first ratio corresponding to each potential threshold in at least one potential threshold, wherein the first ratio is as follows: the proportion of the electric potential larger than each electric potential threshold value in the first electric potentials detected by the detection device;
determining corrosion probability corresponding to a first proportion range corresponding to each potential threshold according to a first corresponding relation among the at least one potential threshold, a plurality of proportion ranges and a plurality of corrosion probabilities, wherein the first proportion range is a proportion range in which a first proportion corresponding to each potential threshold is located in the first corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
Optionally, the detection system for the corrosion probability of the pipeline further includes: the reference electrode is positioned in the insulating pipe, the distance between the reference electrode and the detection electrode is smaller than or equal to a second distance threshold value, one end of the reference electrode is in contact with the stratum, the other end of the reference electrode is connected with the detection device, the material of the reference electrode is the same as that of the pipeline to be detected,
when the detecting electrode with when the pipeline that awaits measuring breaks off, detect the signal of telecommunication of detecting electrode includes: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
the method further comprises the following steps: detecting a second potential of the reference electrode each time the first potential is detected;
determining the corrosion probability of the detection electrode according to the electric signal detected by the detection device, comprising:
determining a difference potential between the first potential and the second potential detected by the detection device each time;
determining a second ratio corresponding to each potential threshold in the at least one potential threshold, wherein the second ratio is as follows: the detection device determines the proportion of the potential which is greater than each potential threshold value in the differential potentials;
determining corrosion probability corresponding to a second proportion range corresponding to each potential threshold according to a second corresponding relation among the at least one potential threshold, the plurality of proportion ranges and the plurality of corrosion probabilities, wherein the second proportion range is a proportion range in which a second proportion corresponding to each potential threshold is located in the second corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
Optionally, when the detection electrode is disconnected from the pipe to be detected, detecting an electrical signal of the detection electrode includes:
the method comprises the steps that when the detection electrode is disconnected with a pipeline to be detected every time, current information of the detection electrode is obtained periodically, wherein the current information is used for indicating current flowing out of the detection electrode;
determining the corrosion probability of the detection electrode according to the electric signal detected by the detection device, comprising:
determining a third proportion of current information which is used for indicating that the current flowing out of the detection electrode is not zero in the acquired current information;
determining a current density of the detection electrode according to the current indicated by each piece of current information;
acquiring the arithmetic mean value of all the determined current densities;
determining a target corrosion rate of the detection electrode according to a corrosion rate formula;
determining a target corrosion rate range in which the target corrosion rate is located in a third corresponding relation between the plurality of corrosion rate ranges and the plurality of corrosion probabilities;
determining the corrosion probability corresponding to the target corrosion rate range in the third corresponding relation as the corrosion probability of the pipeline to be tested;
wherein the corrosion rate formula is:
Vcis indicative of the target corrosion rate and,
of the formula e
To the power, I represents the arithmetic mean, K represents the third ratio, A, T, V0Are all constants.
Optionally, the at least one potential threshold comprises: -0.75 volts, -0.80 volts, and-0.85 volts;
in the second corresponding relationship, the proportional range corresponding to-0.75 volts includes: 0%, 1%, [ 1% -8% ], and (8%, 100% ]; the proportional range corresponding to-0.80 volts includes: 0%, 2%, [ 2% -15% ], and (15%, 100% ]; the proportional range corresponding to-0.85 volts includes: 0%, 5%, [ 5% -20% ], and (20%, 100% ];
[ 0%, 1%), [ 0%, 2%) and [ 0%, 5%) all correspond to a first corrosion probability, [ 1% -8% ], [ 2% -15% ] and [ 5% -20% ] all correspond to a second corrosion probability, (8%, 100% ], (15%, 100% ] and (20%, 100%) all correspond to a third corrosion probability, and the first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased.
Optionally, the corrosion rate range in the third correspondence includes: [0 mm/year, 0.0254 mm/year), [0.0254 mm/year, 0.1 mm/year ], and (0.1 mm/year, ∞ ], wherein infinity represents infinity;
[0, 0.0254 ] corresponds to a first corrosion probability, [0.0254, 0.1] corresponds to a second corrosion probability, and [ 0.1, ∞ ] corresponds to a third corrosion probability, and the first corrosion probability, the second corrosion probability, and the third corrosion probability increase in this order.
Alternatively, A is-0.298, T is 0.227, and V is0Is 0.323.
In another aspect, a detection device for detecting a corrosion probability of a pipeline is provided, where a detection system for detecting a corrosion probability of a pipeline includes: detection electrode with detection device, the pipeline that awaits measuring detection electrode all with detection device electricity is connected, detection electrode and the pipeline that awaits measuring all are located the stratum, and the target location at detection electrode place with the distance of the pipeline that awaits measuring is less than first distance threshold value, detection electrode's material with the material of the pipeline that awaits measuring is the same, detection device includes:
the first control module is used for electrically connecting the pipeline to be detected and the detection electrode so as to enable the first potential of the detection electrode to be the same as the potential of the pipeline to be detected;
the second control module is used for periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode;
the first detection module is used for detecting the electric signal of the detection electrode when the detection electrode is disconnected with the pipeline to be detected;
and the determining module is used for determining the corrosion probability of the detection electrode according to the detected electric signals.
Optionally, the detection system for the corrosion probability of the pipeline further includes: the reference electrode is positioned in the insulating pipe, the distance between the reference electrode and the detection electrode is smaller than or equal to a second distance threshold value, one end of the reference electrode is in contact with the stratum, the other end of the reference electrode is connected with the detection device, the material of the reference electrode is the same as that of the pipeline to be detected,
the first detection module is configured to: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
the detection device further comprises: a second detection module for detecting a second potential of the reference electrode each time the first potential is detected;
the determination module is to:
determining a difference potential between the first potential and the second potential detected by the detection device each time;
determining a second ratio corresponding to each potential threshold in the at least one potential threshold, wherein the second ratio is as follows: the detection device determines the proportion of the potential which is greater than each potential threshold value in the differential potentials;
determining corrosion probability corresponding to a second proportion range corresponding to each potential threshold according to a second corresponding relation among the at least one potential threshold, the plurality of proportion ranges and the plurality of corrosion probabilities, wherein the second proportion range is a proportion range in which a second proportion corresponding to each potential threshold is located in the second corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
In another aspect, a system for detecting a probability of corrosion of a pipeline is provided, the system comprising: the detection device comprises a detection electrode and a detection device, wherein the pipeline to be detected and the detection electrode are electrically connected with the detection device, the detection electrode and the pipeline to be detected are both positioned in the stratum, and the distance between the target position where the detection electrode is positioned and the pipeline to be detected is smaller than a first distance threshold value.
The beneficial effect that technical scheme that this application provided brought includes at least:
according to the method for detecting the corrosion probability of the pipeline, after the pipeline to be detected is electrically connected with the detection electrode, the pipeline to be detected is periodically and sequentially disconnected and electrically connected with the detection electrode, and the detection electric signal is detected when the pipeline to be detected is disconnected with the detection electrode. And then, the detection device can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a system for detecting probability of corrosion of a pipeline according to an embodiment of the present invention;
FIG. 2 is a graph illustrating a relationship between a first position and a second position of a detecting electrode according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a relationship curve of the detecting electrode at a second position according to an embodiment of the present invention;
FIG. 4 is a graph illustrating a relationship between the detecting electrode and the detecting electrode at a third position according to an embodiment of the present invention;
FIG. 5 is a flow chart of a method for detecting the probability of corrosion of a pipeline according to an embodiment of the present invention;
FIG. 6 is a flow chart of another method for detecting corrosion probability of a pipeline according to an embodiment of the present invention;
FIG. 7 is a graph illustrating a relationship between a time for detecting a first potential and a detected first potential according to an embodiment of the present invention;
FIG. 8 is a graph illustrating a relationship between a time for detecting the first potential and a detected first potential according to a second embodiment of the present invention;
FIG. 9 is a graph illustrating a relationship between a time for detecting the first potential and a detected first potential according to a third embodiment of the present invention;
FIG. 10 is a graph illustrating a relationship between a time for detecting the first potential and a detected first potential according to a fourth embodiment of the present invention;
FIG. 11 is a graph illustrating a relationship between a time for detecting the first potential and a detected first potential according to a fifth embodiment of the present invention;
FIG. 12 is a graph illustrating a relationship between a time for detecting the first potential and a detected first potential according to a sixth embodiment of the present invention;
FIG. 13 is a schematic structural diagram of another detection system for corrosion probability of a pipeline according to an embodiment of the present invention;
FIG. 14 is a flowchart of another method for detecting corrosion probability of a pipeline according to an embodiment of the present invention;
FIG. 15 is a graph showing a relationship between a second ratio and an etching rate corresponding to a first potential threshold;
FIG. 16 is a graph showing a relationship between a second duty ratio and an etching rate corresponding to a second potential threshold;
FIG. 17 is a graph showing a relationship between a second ratio and an etching rate corresponding to a third potential threshold;
FIG. 18 is a flow chart of a method for detecting corrosion probability of a pipeline according to another embodiment of the present invention;
FIG. 19 is a schematic structural diagram of an apparatus for detecting probability of corrosion of a pipeline according to an embodiment of the present invention;
fig. 20 is a schematic structural diagram of another apparatus for detecting corrosion probability of a pipeline according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Because the time required for determining the corrosion probability of the pipeline is long in the related art, the embodiment of the invention provides a method, a device and a system for detecting the corrosion probability of the pipeline, which require short time.
Fig. 1 is a schematic structural diagram of a system for detecting a probability of corrosion of a pipeline according to an embodiment of the present invention, and as shown in fig. 1, the system 0 for detecting a probability of corrosion of a pipeline may include: a detection electrode 01 and a detection device X. And the pipeline D to be detected and the detection electrode 01 are electrically connected with the detection device X.
The material of the detecting electrode 01 may be the same as the material of the pipe D to be detected, for example, when the pipe to be detected is made of metal, the detecting electrode may be a metal test piece. Optionally, the pipe D to be tested may be connected with a cathodic protection circuit (not shown in fig. 1), or is not connected with a cathodic protection circuit, which is not limited in this embodiment of the present invention.
The detection electrode 01 and the pipeline D to be detected are both located in the stratum, and the distance L between the target position where the detection electrode 01 is located and the axis Z of the pipeline D to be detected is smaller than a first distance threshold value. The pipeline may be located in the gravity direction of the detection sheet, or the pipeline may not be located in the gravity direction of the detection sheet, which is not limited in the embodiment of the present invention. The first distance threshold may be 60 centimeters when the conduit may be located in the direction of gravity of the test strip. Optionally, the first distance threshold may also be 50 centimeters, 70 centimeters, or 80 centimeters, and the like, which is not limited in this embodiment of the present invention. The first distance threshold may be 40 centimeters when the conduit is not located in the direction of gravity of the test strip. Optionally, the first distance threshold may also be 30 centimeters, 50 centimeters, or 60 centimeters, and the like, which is not limited in this embodiment of the present invention.
Optionally, when the vertical distance between the axis of the pipe to be detected and the ground is 1-2 meters, the depth of the target position where the detection electrode is located may be 0.25-0.35 meters.
Alternatively, the target position where the detection electrode is located may be found by experiment. For example, the detection electrodes may be placed at three different positions, and the potentials of the detection electrodes may be detected at a plurality of detection times when the detection electrodes are at each position, so as to obtain a relationship curve corresponding to each of the three positions. For example, fig. 2, fig. 3 and fig. 4 are graphs illustrating the relationship between the detection electrode and the potential of the detection electrode at three positions, respectively. The abscissa in each graph of the relationship is the detection time in units: hours; the ordinate is the potential of the detection electrode, in units: in volts. Wherein, the depth of the position corresponding to fig. 2 is the same as the depth of the pipeline to be measured, the depth of the position corresponding to fig. 3 is 0.3 meter, and the depth of the position corresponding to fig. 4 is 0.05 meter.
As can be seen from fig. 2, 3 and 4, the trend of the relationship curve in fig. 3 is more similar to that of the relationship curve in fig. 2, while the trend of the relationship curve in fig. 4 is more different from that of the relationship curve in fig. 2. Therefore, in order to embed the detection electrode in the stratum conveniently, and to ensure that the change of the potential on the detection electrode can be consistent with the change of the potential on the pipeline to be detected as much as possible, the depth of the target position where the detection electrode is located can be determined to be 0.3 meter.
Based on the detection system for the pipeline corrosion probability shown in fig. 1, the embodiment of the invention provides a detection method for the pipeline corrosion probability of a detection device X in the detection system. For example, as shown in fig. 5, the method for detecting the corrosion probability of the pipeline may include:
And 102, periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode.
And 103, detecting the electric signal of the detection electrode when the detection electrode is disconnected with the pipeline to be detected.
And 104, determining the corrosion probability of the detection electrode according to the detected electric signal.
In summary, in the method for detecting the corrosion probability of the pipeline provided by the embodiment of the invention, after the pipeline to be detected is electrically connected to the detection electrode, the detection device periodically disconnects and electrically connects the pipeline to be detected and the detection electrode in sequence, and detects the detection electrical signal when the pipeline to be detected and the detection electrode are disconnected. And then, the detection device can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Fig. 6 is a flowchart of another method for detecting a corrosion probability of a pipeline according to an embodiment of the present invention, and as shown in fig. 6, the method for detecting a corrosion probability of a pipeline may include:
In step 601, the detection device may electrically connect the pipe to be detected and the detection electrode through a cable.
Alternatively, the detection device may electrically connect the pipe to be detected and the detection electrode to the target for a long time, so that the first potential of the detection electrode is the same as the potential of the pipe to be detected. This process may be referred to as a process of polarizing the detection electrode. The target time period may be 2 hours, 3 hours, or 5 hours, which is not limited in the embodiment of the present invention.
It should be noted that, when the target duration is short, the detection electrode is easily not polarized completely, that is, the potential of the detection electrode is different from the potential of the pipe to be detected, so that the accuracy of the corrosion probability of the pipe to be detected determined according to the potential of the detection electrode is reduced. When the target duration is longer, the detection electrode can be completely polarized, but the time for determining the corrosion probability of the pipeline to be detected by the detection system of the pipeline corrosion probability is increased, and the working efficiency of the detection system of the pipeline corrosion probability is reduced.
Through a plurality of tests, the embodiment of the invention can ensure that the detection electrode is completely polarized under the condition that the target time length is greater than or equal to 2.25 hours. And when the target duration is close to 2.25 hours, the detection device can be ensured to determine the corrosion probability of the pipeline to be detected in a short time.
In step 602, a period of sequentially disconnecting and electrically connecting the pipe to be tested and the detection electrode by the detection device may be 15 seconds, wherein a time length of disconnecting the pipe to be tested and the detection electrode may be 3 seconds, and a time length of electrically connecting the pipe to be tested and the detection electrode may be 12 seconds. Optionally, the period of sequentially disconnecting and electrically connecting the to-be-detected pipeline and the detection electrode by the detection device may also be 20 seconds and the like, the time duration of disconnecting the to-be-detected pipeline and the detection electrode may also be 5 seconds and the like, and the time duration of electrically connecting the to-be-detected pipeline and the detection electrode may also be 15 seconds and the like, which is not limited in the embodiment of the present invention.
And 603, periodically detecting the first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time.
The detection device may periodically detect the first potential of the detection electrode each time the detection electrode and the pipe to be detected are disconnected in step 602. And when the pipeline to be detected is electrically connected with the detection electrode, the detection device can stop detecting the first potential of the detection electrode.
Alternatively, the period of the first potential of the detection electrode detected by the detection device may be 50 milliseconds, 100 milliseconds or 300 milliseconds, which is not limited in the embodiment of the present invention.
For example, the period of the detection device detecting the first potential may be found through experiments. For example, the detection means may detect the first potential a plurality of times with a plurality of (e.g., six) cycles, respectively. After the first potential is detected a plurality of times with each cycle, a graph showing the relationship between the time of detecting the first potential and the detected first potential may be generated based on the detected first potential and the time of detecting the first potential (see fig. 7 to 12 for details). Wherein, the abscissa of the graph of the relationship curve is the time for detecting the first potential, and the unit is: second; the ordinate is the detected first potential, in units: in volts. The cycle corresponding to fig. 7 (i.e., the cycle in which the detection device detects the first potential) is 1 millisecond, the cycle corresponding to fig. 8 is 10 milliseconds, the cycle corresponding to fig. 9 is 50 milliseconds, the cycle corresponding to fig. 10 is 100 milliseconds, the cycle corresponding to fig. 11 is 1 second, and the cycle corresponding to fig. 12 is 2 seconds. In order to visually observe the variation trend of the first potential, the detecting device may connect the detected first potentials by using a curve, i.e. the graphs shown in fig. 7 to 12 may be obtained
As can be seen from fig. 7 to 12, the first potentials in fig. 7, 8 and 10 have relatively similar variation trends, while the first potentials in fig. 9, 11 and 12 have different variation trends and are different from the first potentials in fig. 7, 8 and 10. Therefore, the first potential detected by using the period corresponding to fig. 7, 8, and 10 can be considered to be accurate, and 1 millisecond, 10 milliseconds, or 100 milliseconds can be used as the period for acquiring the first potential in step 603. In addition, on the basis of ensuring that the acquired first potential is accurate, in order to reduce the number of the detected first potentials and further reduce the occupancy rate of the memory of the detection device, the first potential can be detected in a larger period (for example, 100 milliseconds) of 1 millisecond, 10 milliseconds or 100 milliseconds.
In step 604, the detection device may determine a first fraction corresponding to each potential threshold value according to the detected first potential and at least one potential threshold value. Alternatively, the at least one potential threshold value may be set by the operator in the detection device in advance.
For ease of understanding, the following description will be given taking an example in which the at least one potential threshold includes two potential thresholds, and ten first potentials are detected by the detection means in total. In practical applications, the number of potential thresholds is usually higher than two, and the number of first potentials detected by the detection device is usually higher than ten.
Illustratively, the first of the two potential thresholds is-0.1 volts and the second potential threshold is-0.2 volts. The first potential detected by the detection device is ten in total, and is-0.08 volts, -0.11 volts, -0.12 volts, -0.15 volts, -0.18 volts, -0.21 volts, -0.22 volts, -0.3 volts, -0.11 volts, and-0.09 volts, respectively.
The first duty ratio corresponding to the first potential threshold may be: the ratio of the potentials greater than-0.1 volts among the ten first potentials detected by the detection means may be the number of the potentials greater than-0.1 volts among the first potentials divided by the total number of the first potentials. Since the number of the first potentials higher than-0.1 volt is 2 and the total number of the first potentials is 10, the first ratio corresponding to the first potential threshold is 20%. Similarly, the first duty ratio corresponding to the second potential threshold is: the number of the first potentials greater than-0.2 volts divided by the total number of the first potentials, the number of the first potentials greater than-0.2 volts being 7, the total number of the first potentials being 10, such that the second potential threshold corresponds to a first percentage of 70%.
In step 605, after determining the first percentage corresponding to each potential threshold, the detection device may determine the corrosion probability corresponding to the first proportion range corresponding to each potential threshold according to the first corresponding relationship.
For example, in the first corresponding relationship, the proportional range corresponding to the first potential threshold may include: 0%, 10%, [ 10% -22% ], and (22%, 100% ]; the proportional range corresponding to the second potential threshold may include: 0%, 3%, [ 3% -6% ], and (6%, 100% ]. Wherein [ 0%, 10%) and [ 0%, 3%) correspond to the first corrosion probability, and [ 10% -22% ] and [ 3% -6% ] correspond to the second corrosion probability, and (22%, 100% ] and (6%, 100%) correspond to the third corrosion probability.
The first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased. For example, the first corrosion probability may be 10%, the second corrosion probability may be 50%, and the third corrosion probability may be 80%; alternatively, the first corrosion probability may be 20%, the second corrosion probability may be 60%, and the third corrosion probability may be 90%; optionally, the first corrosion probability, the second corrosion probability, and the third corrosion probability may also be other three probabilities that increase in sequence, which is not limited in the embodiment of the present invention.
For the ten first potentials detected by the detection device in step 604, the first potential threshold corresponds to a first percentage of 20%, and the first percentage is in a proportion range of [ 10% to 22% ], and the proportion range corresponds to the second corrosion probability in the first correspondence relationship. Of the ten first potentials, the second potential threshold corresponds to a first percentage of 70%, the first percentage is in a proportion range (6%, 100%), and the proportion range corresponds to a third corrosion probability in the first correspondence relationship.
And step 606, taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
In step 606, when the detecting means determines a plurality of corrosion probabilities in step 605, the detecting means may take the maximum corrosion probability among the plurality of corrosion probabilities as the corrosion probability of the detection electrode. When the detecting means determines one corrosion probability in step 605, the detecting means may take the maximum corrosion probability (i.e., the one corrosion probability) of the one corrosion probability as the corrosion probability of the detection electrode.
The corrosion probability of the pipe to be tested can be determined based on the embodiment shown in fig. 6. When the worker determines that the corrosion probability of the pipeline to be detected is higher, the worker can take anti-corrosion measures to the pipeline to be detected in time so as to ensure the normal operation of the pipeline to be detected.
In summary, in the method for detecting the corrosion probability of the pipeline provided by the embodiment of the invention, after the pipeline to be detected is electrically connected to the detection electrode, the detection device periodically disconnects and electrically connects the pipeline to be detected and the detection electrode in sequence, and detects the detection electrical signal when the pipeline to be detected and the detection electrode are disconnected. And then, the detection device can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Fig. 13 is a schematic structural diagram of another detection system for detecting corrosion probability of a pipeline according to an embodiment of the present invention. As shown in fig. 13, the detection system 0 for detecting the corrosion probability of the pipeline shown in fig. 1 further includes: reference electrode 04 and insulating tube Y.
The reference electrode 04 may be located within the insulating tube Y and both within the formation. One end of the reference electrode 04 is in contact with the formation and the other end is connected with the detection device X. The material of the reference electrode 04 is the same as that of the pipe D to be measured (that is, the material of the reference electrode 04, the material of the detection electrode 01, and the material of the pipe D to be measured are the same). The material of the insulating tube Y may be Polyvinyl chloride (PVC), or other insulating materials, such as glass.
It should be noted that the main factors influencing the corrosion probability of the pipe to be tested in the formation include: formation properties (e.g., ph, etc.) and stray currents in the formation (which may come from equipment such as subways or trains). The sensing electrode is located in the formation and is affected by both formation properties and stray currents, and therefore the potential on the sensing electrode is related to the formation properties and stray currents. The reference electrode is positioned in the stratum and can be influenced by the stratum property, and under the protection action of the insulating tube, the reference electrode can not be influenced by the stray current, so that the potential on the reference electrode is related to the stratum property, and the difference between the potential on the detection electrode and the potential on the reference electrode is related to the stray current.
Optionally, the distance between the reference electrode 04 and the detection electrode 01 is less than or equal to the second distance threshold. The second distance threshold may be 0.5. Optionally, the second preset distance may also be other values, such as 0.6 meter, 0.8 meter, and the like, which is not limited in the embodiment of the present invention. When the second preset distance is smaller, the stratum environments of the reference electrode and the detection electrode are the same, and errors between the reference electrode and the detection electrode caused by different environments are avoided. Optionally, the reference electrode is horizontally spaced from the detection electrode by less than or equal to 0.5 meters.
Based on the detection system for the corrosion probability of the pipeline shown in fig. 13, the embodiment of the present invention provides another detection method for the corrosion probability of the pipeline of the detection device X in the detection system. For example, as shown in fig. 14, the method for detecting the corrosion probability of the pipeline may include:
And 1402, periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode.
And 1403, periodically detecting the first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time.
At step 1404, a second potential of the reference electrode is sensed each time the first potential is sensed.
In step 1404, the detection device can simultaneously detect the first potential of the detection electrode and the second potential of the reference electrode after the conduit under test is disconnected from the detection electrode.
In step 1405, the detecting unit subtracts the second potential of the reference electrode from the first potential of the detecting electrode detected by the detecting unit each time, thereby obtaining a difference potential between the first potential of the detecting electrode and the second potential of the reference electrode. The difference potential may reflect the effect of stray currents in the formation on the probability of corrosion of the pipe.
For example, the at least one potential threshold in step 1406 may include: -0.75 volts, -0.80 volts, and-0.85 volts. It should be noted that, in the step 1406, the process of determining the ratio of the potentials greater than each potential threshold in the difference potential may refer to the process of determining the ratio of the potentials greater than each potential threshold in the first potential in the step 604, which is not described herein again in this embodiment of the present invention.
Illustratively, when the at least one potential threshold comprises: -0.75 volts, -0.80 volts, and-0.85 volts, in the second correspondence, the proportional range to which-0.75 volts corresponds may include: 0%, 1%, [ 1% -8% ], and (8%, 100% ]; the proportional range corresponding to-0.80 volts may include: 0%, 2%, [ 2% -15% ], and (15%, 100% ]; the proportional range corresponding to-0.85 volts may include: 0%, 5%, [ 5% -20% ], and (20%, 100% ].
Wherein [ 0%, 1% ], [ 0%, 2% ], [ 0%, 5% ] correspond to the first corrosion probability, and [ 1% to 8% ], [ 2% to 15% ] and [ 5% to 20% ] correspond to the second corrosion probability, and (8%, 100% ], [ 15%, 100% ] and (20%, 100%) correspond to the third corrosion probability.
The first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased. For example, the first corrosion probability may be 10%, the second corrosion probability may be 50%, and the third corrosion probability may be 80%; alternatively, the first corrosion probability may be 20%, the second corrosion probability may be 60%, and the third corrosion probability may be 90%; optionally, the first corrosion probability, the second corrosion probability, and the third corrosion probability may also be other three probabilities that increase in sequence, which is not limited in the embodiment of the present invention.
And step 1408, the detection device takes the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
In summary, in the method for detecting the corrosion probability of the pipeline provided by the embodiment of the invention, after the pipeline to be detected is electrically connected to the detection electrode, the detection device periodically disconnects and electrically connects the pipeline to be detected and the detection electrode in sequence, and detects the detection electrical signal when the pipeline to be detected and the detection electrode are disconnected. And then, the detection device can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Alternatively, fig. 15, 16 and 17 are schematic diagrams illustrating the relationship between the second ratio and the corrosion rate corresponding to the three potential thresholds in step 1407. Wherein the ordinate in figures 15, 16 and 17 is the corrosion rate in units: mm/year; the abscissa in FIG. 15 is a second duty ratio corresponding to-0.75 volts; the abscissa in FIG. 16 is a second duty ratio corresponding to-0.80 volts; the abscissa in fig. 17 is the second duty ratio corresponding to-0.85 volts. In each of fig. 15, 16, and 17, a indicates a proportional range corresponding to the first corrosion probability, B indicates a proportional range corresponding to the second corrosion probability, and C indicates a proportional range corresponding to the third corrosion probability. As can be seen from fig. 15, 16, and 17, as the corrosion rate of the detection electrode increases, the second ratio corresponding to the potential threshold increases, and the corrosion probability corresponding to the ratio range in which the ratio is present increases.
Based on the detection system for the pipeline corrosion probability shown in fig. 1, the embodiment of the invention provides another detection method for the pipeline corrosion probability of the detection device X in the detection system. For example, as shown in fig. 18, the method for detecting the corrosion probability of the pipeline may include:
And step 1802, periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode.
When current flows out of the detection electrode, the current information is used for indicating that the current is greater than zero ampere; when no current flows in the detection electrode, the current information indicates that the current is zero amperes.
Alternatively, in step 1804, the detecting device may first calculate the total number of the acquired current information, and then calculate the target number of current information in which the current indicated in the current information is not zero. Thereafter, the detecting device may divide the target number by the total number to obtain a third ratio.
Alternatively, in step 1803, the current density of the detection electrode may be obtained by dividing the current indicated by the current information by the cross-sectional area of the detection electrode, which is perpendicular to the flowing direction of the current in the detection electrode. The cross-sectional area may be manually entered into the detection device by a worker.
The detection means may sum all of the determined current densities and then divide the summed total current density by the number of current densities to obtain the arithmetic mean.
In step 1807, the etch rate is formulated as:
Vcwhich is indicative of the target corrosion rate,
of the formula e
To the power, I represents the arithmetic mean, K represents the third ratio, A, T, V0Are all constants.
Alternatively, A may be-0.298, T may be 0.227, V0May be 0.323.
The corrosion rate range in the third correspondence may include: [0, 0.0254), [0.0254, 0.1] and (0.1, ∞ ], wherein infinity represents infinity; wherein [0, 0.0254 ] corresponds to the first etching probability, [0.0254, 0.1] corresponds to the second etching probability, and [ 0.1, ∞ ] corresponds to the third etching probability.
The first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased. For example, the first corrosion probability may be 10%, the second corrosion probability may be 50%, and the third corrosion probability may be 80%; alternatively, the first corrosion probability may be 20%, the second corrosion probability may be 60%, and the third corrosion probability may be 90%; optionally, the first corrosion probability, the second corrosion probability, and the third corrosion probability may also be other three probabilities that increase in sequence, which is not limited in the embodiment of the present invention.
If the target corrosion rate determined in step 1806 is 0.01, it may correspond to [0, 0.0254) in the corrosion rate range, and [0, 0.0254) corresponds to the first corrosion probability, so that, if the target corrosion rate is 0.01, it corresponds to the first corrosion rate.
And 1809, determining the corrosion probability corresponding to the target corrosion rate range in the third corresponding relation as the corrosion probability of the pipeline to be tested.
In summary, in the method for detecting the corrosion probability of the pipeline provided by the embodiment of the invention, after the pipeline to be detected is electrically connected to the detection electrode, the detection device periodically disconnects and electrically connects the pipeline to be detected and the detection electrode in sequence, and detects the detection electrical signal when the pipeline to be detected and the detection electrode are disconnected. And then, the detection device can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Fig. 19 is a schematic structural diagram of a detection apparatus for detecting a corrosion probability of a pipeline according to an embodiment of the present invention, where the detection apparatus may be the detection apparatus X shown in fig. 1, and as shown in fig. 19, the detection apparatus X may include:
a first control module 1901, configured to electrically connect both the to-be-detected pipeline and the detection electrode, so that a first potential of the detection electrode is the same as a potential of the to-be-detected pipeline;
a second control module 1902, configured to periodically sequentially disconnect and electrically connect the pipeline to be tested and the detection electrode;
a first detecting module 1903, configured to detect an electrical signal of the detecting electrode when the detecting electrode is disconnected from the pipe to be detected;
a determining module 1904, configured to determine a corrosion probability of the detecting electrode according to the detected electrical signal.
In summary, in the device for detecting a corrosion probability of a pipeline provided in the embodiments of the present invention, after the first control module electrically connects the pipeline to be detected and the detection electrode, the second control module periodically and sequentially disconnects and electrically connects the pipeline to be detected and the detection electrode. The first detection module detects a detection electric signal when the pipeline to be detected is disconnected with the detection electrode. And then, the determining module can also determine the corrosion probability of the detection electrode according to the detected electric signal, so as to obtain the corrosion probability of the pipeline to be detected. Therefore, workers can determine the corrosion probability of the pipeline to be detected without digging the detection electrode out of the stratum, the method for determining the corrosion probability of the pipeline to be detected is simplified, and the time required for determining the corrosion probability of the pipeline to be detected is shortened.
Optionally, the first detecting module 1903 is configured to: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected each time;
the determination module 1904 is configured to: determining a first ratio corresponding to each potential threshold in at least one potential threshold, wherein the first ratio is as follows: the proportion of the potentials larger than each potential threshold value in the first potentials detected by the detection device; determining corrosion probability corresponding to a first proportion range corresponding to each potential threshold according to a first corresponding relation among at least one potential threshold, a plurality of proportion ranges and a plurality of corrosion probabilities, wherein the first proportion range is a proportion range in which a first proportion corresponding to each potential threshold is located in the first corresponding relation; and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
Optionally, the first detecting module 1903 is configured to: the method comprises the steps that when a detection electrode is disconnected with a pipeline to be detected every time, current information of the detection electrode is periodically detected, wherein the current information is used for indicating current flowing out of the detection electrode;
the determination module 1904 is configured to: determining a third ratio of current information which is used for indicating that the current flowing out of the detection electrode is not zero in the current information transmitted by the detection device; determining a current density of the detection electrode from the current indicated by each current information; acquiring the arithmetic mean value of all the determined current densities; determining a target corrosion rate of the detection electrode according to a corrosion rate formula; determining a third correspondence between a plurality of corrosion rate ranges and a plurality of corrosion probabilitiesA target corrosion rate range within which the target corrosion rate is located; determining the corrosion probability corresponding to the target corrosion rate range in the third corresponding relation as the corrosion probability of the pipeline to be tested; wherein, the formula of the corrosion rate is as follows:
Vcwhich is indicative of the target corrosion rate,
of the formula e
To the power, I represents the arithmetic mean, K represents the third ratio, A, T, V0Are all constants.
Alternatively, the detection device may also be a detection system for detecting the corrosion probability of the pipeline as shown in fig. 13, in this case, as shown in fig. 20, the detection device X may further include: a second detection module 1905 for detecting a second potential of the reference electrode each time the first potential is detected;
the first detection module 1903 is configured to: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected each time;
the determination module 1904 is configured to: determining a difference potential between the first potential and the second potential detected by the detection device each time; determining a second ratio corresponding to each potential threshold in the at least one potential threshold, wherein the second ratio is as follows: the detection device determines the proportion of the potential which is greater than each potential threshold value in the differential potentials; determining corrosion probability corresponding to a second proportion range corresponding to each potential threshold according to a second corresponding relation among at least one potential threshold, a plurality of proportion ranges and a plurality of corrosion probabilities, wherein the second proportion range is a proportion range in which a second proportion corresponding to each potential threshold is located in the second corresponding relation; and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
Optionally, the at least one potential threshold comprises: -0.75 volts, -0.80 volts, and-0.85 volts; in the second correspondence, a proportional range corresponding to-0.75 volts includes: 0%, 1%, [ 1% -8% ], and (8%, 100% ]; -a ratio range corresponding to 0.80 volts comprising: 0%, 2%, [ 2% -15% ], and (15%, 100% ]; -a ratio range corresponding to 0.85 volts comprising: 0%, 5%, [ 5% -20% ], and (20%, 100% ]; [ 0%, 1%), [ 0%, 2%) and [ 0%, 5%) all correspond to a first corrosion probability, and [ 1% to 8% ], [ 2% to 15% ] and [ 5% to 20% ] all correspond to a second corrosion probability, (8%, 100% ], (15%, 100% ] and (20%, 100%) all correspond to a third corrosion probability, and the first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased.
Optionally, the corrosion rate range in the third correspondence includes: [0, 0.0254), [0.0254, 0.1] and (0.1, ∞ ], wherein infinity represents infinity; [0, 0.0254 ] corresponds to the first corrosion probability, [0.0254, 0.1] corresponds to the second corrosion probability, and [ 0.1, ∞ ] corresponds to the third corrosion probability, and the first corrosion probability, the second corrosion probability, and the third corrosion probability increase in this order.
Alternatively, A is-0.298, T is 0.227, V0Is 0.323.
Alternatively, the first control module 1901 and the second control module 1902 may be electrically connected to the pipe D to be tested and the detection electrode 01, and the first detection module 1903 may be electrically connected to the detection electrode 01 and the determination module 1904. It should be noted that the detection apparatus X may also be divided into other modules according to functions that need to be implemented by the detection apparatus X, and the modules may be connected according to the functions that need to be implemented by the modules, which is not limited in this embodiment of the present invention.
Alternatively, according to the functions that the detection device X needs to implement, the detection device X may be divided into: the detection system comprises a circuit breaking module, a processing module and a detection module, wherein the circuit breaking module is electrically connected with a pipeline to be detected and a detection electrode, the detection module is electrically connected with the detection electrode and the processing module, and when the detection system for the corrosion rate of the pipeline comprises a reference electrode, the detection module is also electrically connected with the reference electrode. Illustratively, the circuit breaking module can be a circuit breaker, the detection module can be a multimeter, and the processing module can include a memory for storing electrical signals detected by the multimeter, and a processor for processing the electrical signals to obtain the corrosion probability.
It should be noted that, the method embodiment, the apparatus embodiment and the system embodiment provided in the embodiment of the present invention can be mutually referred to, and the embodiment of the present invention does not limit this. The sequence of the steps of the method embodiments provided by the embodiments of the present invention can be appropriately adjusted, and the steps can be correspondingly increased or decreased according to the situation, and any method that can be easily conceived by those skilled in the art within the technical scope disclosed by the present invention shall be covered by the protection scope of the present invention, and therefore, the detailed description thereof shall not be repeated.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method for detecting the corrosion probability of a pipeline is characterized in that the method is used for a detection device in a detection system of the corrosion probability of the pipeline, and the detection system of the corrosion probability of the pipeline further comprises the following steps: the detection device comprises a detection electrode, a pipeline to be detected, wherein the detection electrode is electrically connected with the detection device, the detection electrode and the pipeline to be detected are both positioned in a stratum, the distance between the target position where the detection electrode is positioned and the pipeline to be detected is smaller than a first distance threshold value, the detection electrode is made of the same material as that of the pipeline to be detected, and the method comprises the following steps:
electrically connecting the pipeline to be detected with a detection electrode so as to enable the potential of the detection electrode to be the same as that of the pipeline to be detected;
periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode;
when the detection electrode is disconnected with the pipeline to be detected, detecting an electric signal of the detection electrode;
and determining the corrosion probability of the detection electrode according to the detected electric signal.
2. The method of claim 1, wherein detecting the electrical signal of the detection electrode while the detection electrode is disconnected from the pipe under test comprises:
periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
determining a probability of corrosion of the detection electrode based on the detected electrical signal, comprising:
determining a first ratio corresponding to each potential threshold in at least one potential threshold, wherein the first ratio is as follows: the proportion of the electric potential larger than each electric potential threshold value in the first electric potentials detected by the detection device;
determining corrosion probability corresponding to a first proportion range corresponding to each potential threshold according to a first corresponding relation among the at least one potential threshold, a plurality of proportion ranges and a plurality of corrosion probabilities, wherein the first proportion range is a proportion range in which a first proportion corresponding to each potential threshold is located in the first corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
3. The method of claim 1, wherein the detection system of the probability of pipe corrosion further comprises: the reference electrode is positioned in the insulating pipe, the distance between the reference electrode and the detection electrode is smaller than or equal to a second distance threshold value, one end of the reference electrode is in contact with the stratum, the other end of the reference electrode is connected with the detection device, the material of the reference electrode is the same as that of the pipeline to be detected,
when the detecting electrode with when the pipeline that awaits measuring breaks off, detect the signal of telecommunication of detecting electrode includes: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
the method further comprises the following steps: detecting a second potential of the reference electrode each time the first potential is detected;
determining the corrosion probability of the detection electrode according to the electric signal detected by the detection device, comprising:
determining a difference potential between the first potential and the second potential detected by the detection device each time;
determining a second ratio corresponding to each potential threshold in the at least one potential threshold, wherein the second ratio is as follows: the detection device determines the proportion of the potential which is greater than each potential threshold value in the differential potentials;
determining corrosion probability corresponding to a second proportion range corresponding to each potential threshold according to a second corresponding relation among the at least one potential threshold, the plurality of proportion ranges and the plurality of corrosion probabilities, wherein the second proportion range is a proportion range in which a second proportion corresponding to each potential threshold is located in the second corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
4. The method of claim 1, wherein detecting the electrical signal of the detection electrode while the detection electrode is disconnected from the pipe under test comprises:
the method comprises the steps that when the detection electrode is disconnected with a pipeline to be detected every time, current information of the detection electrode is obtained periodically, wherein the current information is used for indicating current flowing out of the detection electrode;
determining the corrosion probability of the detection electrode according to the electric signal detected by the detection device, comprising:
determining a third proportion of current information which is used for indicating that the current flowing out of the detection electrode is not zero in the acquired current information;
determining a current density of the detection electrode according to the current indicated by each piece of current information;
acquiring the arithmetic mean value of all the determined current densities;
determining a target corrosion rate of the detection electrode according to a corrosion rate formula;
determining a target corrosion rate range in which the target corrosion rate is located in a third corresponding relation between the plurality of corrosion rate ranges and the plurality of corrosion probabilities;
determining the corrosion probability corresponding to the target corrosion rate range in the third corresponding relation as the corrosion probability of the pipeline to be tested;
wherein the corrosion rate formula is:
Vcis indicative of the target corrosion rate and,
of the formula e
To the power, I represents the arithmetic mean, K represents the third ratio, A, T, V0Are all constants.
5. The method of claim 3,
the at least one potential threshold comprises: -0.75 volts, -0.80 volts, and-0.85 volts;
in the second corresponding relationship, the proportional range corresponding to-0.75 volts includes: 0%, 1%, [ 1% -8% ], and (8%, 100% ]; the proportional range corresponding to-0.80 volts includes: 0%, 2%, [ 2% -15% ], and (15%, 100% ]; the proportional range corresponding to-0.85 volts includes: 0%, 5%, [ 5% -20% ], and (20%, 100% ];
[ 0%, 1%), [ 0%, 2%) and [ 0%, 5%) all correspond to a first corrosion probability, [ 1% -8% ], [ 2% -15% ] and [ 5% -20% ] all correspond to a second corrosion probability, (8%, 100% ], (15%, 100% ] and (20%, 100%) all correspond to a third corrosion probability, and the first corrosion probability, the second corrosion probability and the third corrosion probability are sequentially increased.
6. The method of claim 4,
the corrosion rate range in the third correspondence includes: [0 mm/year, 0.0254 mm/year), [0.0254 mm/year, 0.1 mm/year ], and (0.1 mm/year, ∞ ], wherein infinity represents infinity;
[0, 0.0254 ] corresponds to a first corrosion probability, [0.0254, 0.1] corresponds to a second corrosion probability, and [ 0.1, ∞ ] corresponds to a third corrosion probability, and the first corrosion probability, the second corrosion probability, and the third corrosion probability increase in this order.
7. The method of claim 4 or 6, wherein a is-0.298, T is 0.227, and V is0Is 0.323.
8. A detection device for detecting the corrosion probability of a pipeline is characterized in that a detection system for detecting the corrosion probability of the pipeline where the detection device is located comprises: detection electrode with detection device, the pipeline that awaits measuring detection electrode all with detection device electricity is connected, detection electrode and the pipeline that awaits measuring all are located the stratum, and the target location at detection electrode place with the distance of the pipeline that awaits measuring is less than first distance threshold value, detection electrode's material with the material of the pipeline that awaits measuring is the same, detection device includes:
the first control module is used for electrically connecting the pipeline to be detected and the detection electrode so as to enable the first potential of the detection electrode to be the same as the potential of the pipeline to be detected;
the second control module is used for periodically and sequentially disconnecting and electrically connecting the pipeline to be detected and the detection electrode;
the first detection module is used for detecting the electric signal of the detection electrode when the detection electrode is disconnected with the pipeline to be detected;
and the determining module is used for determining the corrosion probability of the detection electrode according to the detected electric signals.
9. The method of claim 8, wherein the detection system of the probability of pipe corrosion further comprises: the reference electrode is positioned in the insulating pipe, the distance between the reference electrode and the detection electrode is smaller than or equal to a second distance threshold value, one end of the reference electrode is in contact with the stratum, the other end of the reference electrode is connected with the detection device, the material of the reference electrode is the same as that of the pipeline to be detected,
the first detection module is configured to: periodically detecting a first potential of the detection electrode when the detection electrode is disconnected with the pipeline to be detected every time;
the detection device further comprises: a second detection module for detecting a second potential of the reference electrode each time the first potential is detected;
the determination module is to:
determining a difference potential between the first potential and the second potential detected by the detection device each time;
determining a second ratio corresponding to each potential threshold in the at least one potential threshold, wherein the second ratio is as follows: the detection device determines the proportion of the potential which is greater than each potential threshold value in the differential potentials;
determining corrosion probability corresponding to a second proportion range corresponding to each potential threshold according to a second corresponding relation among the at least one potential threshold, the plurality of proportion ranges and the plurality of corrosion probabilities, wherein the second proportion range is a proportion range in which a second proportion corresponding to each potential threshold is located in the second corresponding relation;
and taking the determined maximum corrosion probability as the corrosion probability of the pipeline to be detected.
10. A system for detecting probability of corrosion of a pipeline, the system comprising: the detection device comprises a detection electrode and a detection device, wherein the pipeline to be detected and the detection electrode are electrically connected with the detection device, the detection electrode and the pipeline to be detected are both positioned in the stratum, and the distance between the target position where the detection electrode is positioned and the pipeline to be detected is smaller than a first distance threshold value.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116363441A (en) * | 2023-05-31 | 2023-06-30 | 克拉玛依市百事达技术开发有限公司 | Pipeline corrosion detection system with marking function |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185800A (en) * | 1996-12-25 | 1998-07-14 | Tokyo Gas Co Ltd | Evaluation method for corrosion-proof in cathode corrosion-proof system |
| JP2006145492A (en) * | 2004-11-24 | 2006-06-08 | Tokyo Gas Co Ltd | Measurement evaluation method and device for stray current corrosion risk of cathode-protected burial metal |
| CN104233314A (en) * | 2014-09-22 | 2014-12-24 | 中国石油天然气集团公司 | Dynamic interference potential test system for buried pipeline |
| CN104651854A (en) * | 2015-02-13 | 2015-05-27 | 深圳市燃气集团股份有限公司 | Method and system for measuring switch-off potential of cathode protection system |
| CN104726871A (en) * | 2015-03-11 | 2015-06-24 | 深圳市燃气集团股份有限公司 | Cathodic protection system test piece testing system and testing method |
| CN106442302A (en) * | 2016-09-18 | 2017-02-22 | 华中科技大学 | Monitoring method and device of polarization resistance and corrosion speed of surface of pipe wall of pipeline |
| CN107145685A (en) * | 2017-06-06 | 2017-09-08 | 北京市燃气集团有限责任公司 | The dynamic DC influence monitoring system of pipeline based on the Big Dipper and methods of risk assessment |
-
2018
- 2018-11-23 CN CN201811410411.2A patent/CN111220536A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10185800A (en) * | 1996-12-25 | 1998-07-14 | Tokyo Gas Co Ltd | Evaluation method for corrosion-proof in cathode corrosion-proof system |
| JP2006145492A (en) * | 2004-11-24 | 2006-06-08 | Tokyo Gas Co Ltd | Measurement evaluation method and device for stray current corrosion risk of cathode-protected burial metal |
| CN104233314A (en) * | 2014-09-22 | 2014-12-24 | 中国石油天然气集团公司 | Dynamic interference potential test system for buried pipeline |
| CN104651854A (en) * | 2015-02-13 | 2015-05-27 | 深圳市燃气集团股份有限公司 | Method and system for measuring switch-off potential of cathode protection system |
| CN104726871A (en) * | 2015-03-11 | 2015-06-24 | 深圳市燃气集团股份有限公司 | Cathodic protection system test piece testing system and testing method |
| CN106442302A (en) * | 2016-09-18 | 2017-02-22 | 华中科技大学 | Monitoring method and device of polarization resistance and corrosion speed of surface of pipe wall of pipeline |
| CN107145685A (en) * | 2017-06-06 | 2017-09-08 | 北京市燃气集团有限责任公司 | The dynamic DC influence monitoring system of pipeline based on the Big Dipper and methods of risk assessment |
Non-Patent Citations (3)
| Title |
|---|
| 李秋扬 等: "极化电位测量与远传技术在东黄输油老线的应用", 《油气储运》 * |
| 李自力 等: "试片断电法测量埋地管道的断电电位", 《材料保护》 * |
| 王荣 等: "《管道的腐蚀与控制》", 31 March 2013, 西北工业大学出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116363441A (en) * | 2023-05-31 | 2023-06-30 | 克拉玛依市百事达技术开发有限公司 | Pipeline corrosion detection system with marking function |
| CN116363441B (en) * | 2023-05-31 | 2023-08-08 | 克拉玛依市百事达技术开发有限公司 | Pipeline corrosion detection system with marking function |
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