CN115541486A - Automatic testing arrangement of pipeline corrosion rate - Google Patents

Automatic testing arrangement of pipeline corrosion rate Download PDF

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CN115541486A
CN115541486A CN202211312979.7A CN202211312979A CN115541486A CN 115541486 A CN115541486 A CN 115541486A CN 202211312979 A CN202211312979 A CN 202211312979A CN 115541486 A CN115541486 A CN 115541486A
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test piece
metal test
corrosion
unit
module
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苏茂源
张安安
李茜
杨威
刘建生
杨超
马岩
周嘉婷
党一中
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Southwest Petroleum University
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/006—Investigating resistance of materials to the weather, to corrosion, or to light of metals
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
    • G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract

The invention discloses an automatic testing device for corrosion rate of a pipeline, which comprises: the device comprises a power supply module, a metal test piece probe, a standard signal source, a measuring module, a signal processing module, a positioning module and a communication storage module; the metal test piece probe comprises: the probe comprises a probe body, a corrosion metal test piece and a compensation metal test piece; the material of the corrosion metal test piece is consistent with that of the pipeline to be detected, and the corrosion metal test piece is close to the pipeline to be detected and buried in soil; the compensation metal test piece is packaged in the probe body; the measuring module measures the voltage at two ends of the corrosion metal test piece and the compensation metal test piece under the condition that the standard signal source provides current; the signal processing module calculates the thickness change and the corrosion rate of the corrosion metal test piece within a certain time; the positioning module positions the installation position of the testing device; the communication storage module transmits various data signals to the cloud platform and/or the mobile terminal. The invention can realize the online monitoring and evaluation of the corrosion rate of the pipeline and improve the monitoring efficiency.

Description

Automatic testing arrangement of pipeline corrosion rate
Technical Field
The invention relates to the technical field of petroleum pipeline detection, in particular to an automatic pipeline corrosion rate testing device.
Background
With the large-scale construction of the ultra-high voltage transmission line and the buried oil and gas pipeline, the conditions of the ultra-high voltage transmission line and the buried oil and gas pipeline are close to or are more and more parallel, and the risk of corrosion, perforation and explosion of the metal pipeline caused by the interference of stray current of the ultra-high voltage transmission line on the oil and gas pipeline is increased day by day. At present, a manual detection mode of a weightlessness detection piece method is generally adopted, but the manual detection mode has certain limitation, frequent manual inspection and pipeline excavation are needed, the operation efficiency is low, and resources are wasted.
Therefore, it is an urgent need to solve the problem of the art to provide an automatic testing device for pipeline corrosion rate, which can monitor the pipeline corrosion rate on line and improve the detection precision.
Disclosure of Invention
In view of this, the invention provides an automatic testing device for pipeline corrosion rate, which can realize online monitoring and evaluation of pipeline corrosion rate and improve monitoring efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
an automatic testing device for corrosion rate of pipeline, comprising: the device comprises a power supply module, a metal test piece probe, a standard signal source, a measuring module, a signal processing module, a positioning module and a communication storage module; the power supply module is used for supplying power to the standard signal source, the measuring module, the signal processing module, the communication storage module and the positioning module respectively;
the metal test piece probe comprises: the probe comprises a probe body, a corrosion metal test piece and a compensation metal test piece; the material of the corrosion metal test piece is consistent with that of the pipeline to be detected, and the corrosion metal test piece is close to the pipeline to be detected and buried in soil; the compensation metal test piece is packaged in the probe body;
the standard signal source is used for providing constant current to the corrosion metal test piece and the compensation metal test piece under the control of the signal processing module;
the measuring module is used for measuring the voltages at two ends of the corrosion metal test piece and the compensation metal test piece at intervals of a preset time period under the control of the signal processing module;
the signal processing module is used for calculating the thickness change and the corrosion rate of the corrosion metal test piece in a certain time according to the voltage signal measured by the measuring module;
the positioning module is used for positioning the installation position of the testing device;
the communication storage module is used for transmitting the corrosion rate of the corrosion metal test piece and the position information of the testing device to a cloud platform and/or a mobile terminal.
Further, the method also comprises the following steps: a reference electrode; the measuring module is used for measuring the voltages at two ends of the corrosion metal test piece and the reference electrode and the voltages at two ends of the compensation metal test piece and the reference electrode.
Furthermore, the measuring module comprises two measuring units, and each measuring unit comprises a voltage attenuation unit, an offset unit and an ADC conversion unit; the voltage attenuation unit is used for attenuating large voltage existing in the current environment into smaller voltage in a voltage division mode; the bias unit is used for converting the attenuated voltage into a specific voltage signal which can be input into the ADC conversion unit; the ADC conversion unit is used for converting a specific voltage signal into a corresponding digital signal and outputting the digital signal to the signal processing module.
Further, the signal processing module includes: the device comprises a resistance calculation unit, a metal test piece thickness calculation unit and a corrosion rate calculation unit;
the resistance calculating unit is used for calculating the resistance R of the corrosion metal test piece according to the constant current output by the standard signal source, the voltage at the two ends of the corrosion metal test piece and the voltage at the two ends of the compensation metal test piece C And the resistance R of the compensation metal test piece R ；
The metal test piece thickness calculating unit is used for calculating the current thickness of the corrosion metal test piece according to the resistance value changes of the corrosion metal test piece and the compensation metal test piece within a certain time;
the corrosion rate calculating unit is used for calculating the corrosion rate according to the thickness change of the corrosion metal test piece in a certain time.
Further, the signal processing module further includes: a current density calculation unit; the measurement module further comprises: an AC/DC separation unit;
the alternating current and direct current separation unit is used for separating alternating current and direct current flowing through the corrosion metal test piece by adopting Fourier transform to obtain a direct current component and an alternating current component;
the current density calculating unit is used for calculating the direct current density of the corrosion metal test piece according to the direct current component obtained through Fourier transformation and the area of the corrosion metal test piece, and calculating the alternating current density of the corrosion metal test piece according to the alternating current component obtained through Fourier transformation and the area of the corrosion metal test piece.
Further, the signal processing module further includes: a diffusion resistance calculation unit; the diffusion resistance calculating unit is used for calculating the diffusion resistance of the corrosion test piece.
Further, the signal processing module further includes: an alarm data generating unit;
the alarm data generation unit is used for comparing the corrosion rate and/or the corrosion thickness of the corrosion metal test piece with a preset threshold value, and generating alarm data when the corrosion rate and/or the corrosion thickness exceed the preset threshold value.
Further, the communication storage module includes: a communication unit and a storage unit;
the communication unit is used for remotely transmitting various data generated by the signal processing unit and the position information of the testing device to a cloud platform or a mobile terminal in a mode of 4G + MQTT + JSON;
the storage unit is used for temporarily storing the data to be sent when the communication unit fails to send the data.
Further, the communication unit includes: RS485 interface, GPRS interface, NB-IOT interface and Bluetooth interface.
Furthermore, the power module is a rechargeable battery, a mains supply module or a solar power supply module.
According to the technical scheme, compared with the prior art, the automatic testing device for the corrosion rate of the pipeline is provided, the voltage values of the two ends of the corrosion metal test piece and the compensation metal test piece are measured in real time through the double-metal test piece probe composed of the corrosion metal test piece and the compensation metal test piece, the compensation metal test piece is packaged to be not in contact with soil, the thickness of the compensation metal test piece is further guaranteed not to change, the thickness of the corrosion metal test piece is measured according to the positive correlation relation between the resistance value and the thickness of the two metal test pieces, and finally the online monitoring of the corrosion rate of the pipeline is achieved. The invention can realize the on-line automatic monitoring and on-line evaluation of the pipeline without frequently carrying out manual inspection on the pipeline excavation, thereby greatly improving the detection efficiency.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a metal test piece probe according to the present invention;
FIG. 2 is a schematic diagram of the connection between the automatic testing apparatus and the pipeline provided by the present invention;
fig. 3 is a block diagram of a measurement module according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention discloses an automatic testing apparatus for a corrosion rate of a pipeline, including: the device comprises a power supply module, a metal test piece probe, a standard signal source, a measuring module, a signal processing module, a positioning module and a communication storage module; the power supply module is used for supplying power to the standard signal source, the measuring module, the signal processing module, the communication storage module and the positioning module respectively; the power supply module is a rechargeable battery, a commercial power supply module or a solar power supply module;
the metal test piece probe comprises: the probe comprises a probe body, a corrosion metal test piece and a compensation metal test piece; the material of the corrosion metal test piece is consistent with that of the pipeline to be detected, and the corrosion metal test piece is close to the pipeline to be detected and buried in soil; the compensation metal test piece is packaged in the probe body;
the standard signal source (i.e. constant current source) is used for providing constant current to the corrosion metal test piece and the compensation metal test piece under the control of the signal processing module;
the measuring module is used for measuring the voltage at two ends of the corrosion metal test piece and the compensation metal test piece at intervals of a preset time period under the control of the signal processing module;
the signal processing module is used for calculating the thickness change and the corrosion rate of the corrosion metal test piece within a certain time according to the voltage signal measured by the measuring module;
the positioning module is used for positioning the installation position of the testing device;
the communication storage module is used for transmitting the corrosion rate of the corrosion metal test piece and the position information of the testing device to the cloud platform and/or the mobile terminal.
In one embodiment, further comprising: a reference electrode; the measuring module is used for measuring the voltage at two ends of the corrosion metal test piece and the reference electrode and compensating the voltage at two ends of the metal test piece and the reference electrode.
In practical application, the parameter measuring method comprises the following steps:
corrosion rate measurement
Switch S0 is open and S1, S2 are closed. The first voltmeter records the voltages at two ends of the corrosion metal test piece and the reference electrode, and the second voltmeter records the voltages at two ends of the compensation metal test piece and the reference electrode. The switches S0, S1 and S2 adopt relays, and are started once at intervals of a certain time under the control of the signal processing module.
The first step is as follows: calculating the voltage at two ends of the corrosion test piece, namely subtracting the fixed voltage of the reference electrode from the voltage value recorded by the first voltmeter, namely V1;
the second step: according to the known current, the resistance R of the corrosion test piece at the moment is calculated respectively C (t) temperature compensating test piece resistance R R (t)；
The third step: according to the formula:
Figure BDA0003907796090000051
and calculating the thickness of the corrosion test piece at the moment, and calculating the corroded thickness according to the initial thickness to calculate the corrosion rate.
In one embodiment, as shown in fig. 3, the measurement module includes two measurement units, each measurement unit includes a voltage attenuation unit, an offset unit, and an ADC conversion unit; the voltage attenuation unit is used for attenuating large voltage existing in the current environment into smaller voltage in a voltage division mode; the bias unit is used for converting the attenuated voltage into a specific voltage signal which can be input into the ADC conversion unit; the ADC conversion unit is used for converting the specific voltage signal into a corresponding digital signal and outputting the digital signal to the signal processing module.
In one embodiment, the signal processing module comprises: the device comprises a resistance calculation unit, a metal test piece thickness calculation unit and a corrosion rate calculation unit;
the resistance calculating unit is used for calculating the constant current output by the standard signal source and the voltage V at two ends of the corrosion metal test piece C And compensating the voltage V across the metal strip R Calculating the resistance R of the corrosion metal test piece C And compensating the resistance R of the metal test piece R ；
The metal test piece thickness calculating unit is used for calculating the current thickness of the corrosion metal test piece according to the resistance value changes of the corrosion metal test piece and the compensation metal test piece within a certain time; the specific calculation formula is as follows:
Figure BDA0003907796090000061
wherein d is c (t) the thickness of the corrosion metal test piece is measured at the time t; d (t = 0) is the thickness of the corrosion metal test piece at the initial moment; r C (t = 0) is the resistance value of the corrosion metal test piece at the initial moment; r R (t = 0) is the initial time to compensate the resistance value of the metal test piece; r C (t) is the resistance value of the corrosion metal test piece of the t-etching; r R And (t) is the resistance value of the compensation metal test piece at t moment.
The corrosion rate calculating unit is used for calculating the corrosion rate according to the thickness change of the corrosion metal test piece within a certain time, and the specific calculation formula is as follows:
Figure BDA0003907796090000062
wherein, K d Is the corrosion rate; d (t = 0) is the thickness of the metal test piece measured at the initial moment and is unit millimeter (mm); d (t) is the measured thickness of the metal test piece at the moment tBit millimeters (mm); t is corrosion time in years.
In other embodiments, the signal processing module further comprises: a current density calculation unit; the measurement module further includes: an AC/DC separation unit;
the alternating current-direct current separation unit is used for separating alternating current and direct current flowing through the corrosion metal test piece by adopting Fourier transform to obtain a direct current component and an alternating current component;
the current density calculating unit is used for calculating the direct current density of the corrosion metal test piece according to the direct current component obtained through Fourier transformation and the area of the corrosion metal test piece, and calculating the alternating current density of the corrosion metal test piece according to the alternating current component obtained through Fourier transformation and the area of the corrosion metal test piece. The specific calculation formula is as follows:
alternating current density: j. the design is a square AC ＝I AC /S；
Direct current density: j. the design is a square DC ＝I DC /S；
Wherein S is the area of the corrosion metal test piece. In the embodiment of the invention, the current density, namely the current in the unit area of the test piece, is equivalent to the leakage amount in the unit area of the corrosion damage point of the pipeline.
This embodiment aim at separation pipeline alternating voltage and direct current voltage, in the pipeline, under the prerequisite of the protection of negative pole, install sacrificial anode or constant potential rectifier in advance, closed S0, disconnection S1, S2, record corrosion test piece both ends voltage value, the voltage value of record this moment is the alternating current-direct current voltage of flowing through pipeline and corrosion metal test piece, then direct current voltage and alternating current voltage among the alternating current-direct current voltage are analyzed out with FFT, and then the analysis pipeline receives stray current' S interference condition.
In other embodiments, the signal processing module of the present invention further includes a diffusion resistance calculating unit, where the diffusion resistance calculating unit is configured to calculate a diffusion resistance of the pipe or the corrosion test piece to be measured, the diffusion resistance is also a parameter reflecting a corrosion condition of the pipe, and a calculation formula of the diffusion resistance is as follows:
Figure BDA0003907796090000071
wherein VAC represents the AC voltage flowing through the corrosion metal test piece.
In one embodiment, the signal processing module further comprises: an alarm data generating unit;
the alarm data generation unit is used for comparing the corrosion rate and/or the corrosion thickness of the corrosion metal test piece with a preset threshold value, and generating alarm data when the corrosion rate and/or the corrosion thickness exceed the preset threshold value.
The present embodiment can evaluate the pipeline online via alarm data.
In one embodiment, a communication storage module comprises: a communication unit and a storage unit;
the communication unit is used for remotely transmitting various data generated by the signal processing unit and the position information of the testing device to the cloud platform or the mobile terminal in a mode of 4G + MQTT + JSON; in the embodiment of the invention, the communication unit sends data once every preset time.
The storage unit is used for temporarily storing the data to be sent when the communication unit fails to send the data so as to wait for the next sending.
Wherein, the communication unit includes: RS485 interface, GPRS interface, NB-IOT interface and Bluetooth interface.
Specifically, the test process of the present invention is as follows:
the first step is as follows: installing an automatic testing device according to the figure 2, wherein the standard resistor in the figure is a sampling resistor and is used for measuring the alternating current voltage and the direct current voltage of the pipeline;
the second step is that: the signal processing module controls the standard signal source to output constant current;
the third step: the measuring module is used for measuring the voltage of the corrosion metal test piece and the voltage of the compensation metal test piece;
the fourth step: the signal processing module reads the signal of the measuring module in real time and calculates the current density, the resistance value and the corrosion rate;
the fifth step: analyzing the state of the pipeline by combining the corrosion rate of the pipeline and the alternating current and direct current voltage and current, judging the state and the alarm level of the pipeline, and sending a state signal and an alarm state signal of the pipeline to a background according to the corresponding state; the status signals of the pipeline are: whether the pipeline is seriously corroded, whether the pipeline protection potential is normal or not and whether the interference of stray current is great or not.
And a sixth step: sending the collected data, the pipeline state signal and the alarm level state signal to a background, and if the data transmission fails, temporarily storing the data to be transmitted in a storage module (SD card) for waiting for the next transmission;
the seventh step: and storing and analyzing the data, the pipeline state signal and the alarm level state signal on the cloud platform, and sending alarm information by combining the pipeline state signal and the alarm level state signal.
In the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An apparatus for automatically testing the corrosion rate of a pipeline, comprising: the device comprises a power supply module, a metal test piece probe, a standard signal source, a measuring module, a signal processing module, a positioning module and a communication storage module; the power supply module is used for supplying power to the standard signal source, the measuring module, the signal processing module, the communication storage module and the positioning module respectively;
the metal test piece probe comprises: the probe comprises a probe body, a corrosion metal test piece and a compensation metal test piece; the material of the corrosion metal test piece is consistent with that of the pipeline to be detected, and the corrosion metal test piece is close to the pipeline to be detected and buried in soil; the compensation metal test piece is packaged in the probe body;
the standard signal source is used for providing constant current to the corrosion metal test piece and the compensation metal test piece under the control of the signal processing module;
the measuring module is used for measuring the voltages at two ends of the corrosion metal test piece and the compensation metal test piece at intervals of a preset time period under the control of the signal processing module;
the signal processing module is used for calculating the thickness change and the corrosion rate of the corrosion metal test piece in a certain time according to the voltage signal measured by the measuring module;
the positioning module is used for positioning the installation position of the testing device;
the communication storage module is used for transmitting the corrosion rate of the corrosion metal test piece and the position information of the testing device to a cloud platform and/or a mobile terminal.
2. The apparatus for automatically testing the corrosion rate of a pipeline according to claim 1, further comprising: a reference electrode; the measuring module is used for measuring the voltages at two ends of the corrosion metal test piece and the reference electrode and the voltages at two ends of the compensation metal test piece and the reference electrode.
3. The automatic testing device for the corrosion rate of the pipeline according to claim 2, wherein the measuring module comprises two measuring units, and each measuring unit comprises a voltage attenuation unit, a bias unit and an ADC conversion unit; the voltage attenuation unit is used for attenuating large voltage existing in the current environment into smaller voltage in a voltage division mode; the bias unit is used for converting the attenuated voltage into a specific voltage signal which can be input into the ADC conversion unit; the ADC conversion unit is used for converting a specific voltage signal into a corresponding digital signal and outputting the digital signal to the signal processing module.
4. The automatic testing device for the corrosion rate of the pipeline according to claim 1, wherein the signal processing module comprises: the device comprises a resistance calculating unit, a metal test piece thickness calculating unit and a corrosion rate calculating unit;
the resistance calculating unit is used for calculating the resistance R of the corrosion metal test piece according to the constant current output by the standard signal source, the voltage at the two ends of the corrosion metal test piece and the voltage at the two ends of the compensation metal test piece C And the resistance R of the compensation metal test piece R ；
The metal test piece thickness calculating unit is used for calculating the current thickness of the corrosion metal test piece according to the resistance value changes of the corrosion metal test piece and the compensation metal test piece within a certain time;
the corrosion rate calculating unit is used for calculating the corrosion rate according to the thickness change of the corrosion metal test piece in a certain time.
5. The apparatus of claim 4, wherein the signal processing module further comprises: a current density calculation unit; the measurement module further comprises: an AC/DC separation unit;
the alternating current and direct current separation unit is used for separating alternating current and direct current voltages flowing through the corrosion metal test piece by adopting Fourier transform to obtain a direct current component and an alternating current component;
the current density calculating unit is used for calculating the direct current density of the corrosion metal test piece according to the direct current component obtained through Fourier transformation and the area of the corrosion metal test piece, and calculating the alternating current density of the corrosion metal test piece according to the alternating current component obtained through Fourier transformation and the area of the corrosion metal test piece.
6. The apparatus for automatically testing the corrosion rate of a pipeline according to claim 5, wherein the signal processing module further comprises: a diffusion resistance calculation unit; the diffusion resistance calculating unit is used for calculating the diffusion resistance of the corrosion test piece.
7. The apparatus of claim 4, wherein the signal processing module further comprises: an alarm data generating unit;
the alarm data generation unit is used for comparing the corrosion rate and/or the corrosion thickness of the corrosion metal test piece with a preset threshold value, and generating alarm data when the corrosion rate and/or the corrosion thickness of the corrosion metal test piece exceed the preset threshold value.
8. The apparatus for automatically testing the corrosion rate of a pipeline according to claim 1, wherein the communication storage module comprises: a communication unit and a storage unit;
the communication unit is used for remotely transmitting various data generated by the signal processing unit and the position information of the testing device to a cloud platform or a mobile terminal in a mode of 4G + MQTT + JSON;
the storage unit is used for temporarily storing the data to be sent when the communication unit fails to send the data.
9. The apparatus for automatically testing the corrosion rate of a pipeline according to claim 8, wherein the communication unit comprises: RS485 interface, GPRS interface, NB-IOT interface and Bluetooth interface.
10. The automatic testing device for the corrosion rate of the pipeline according to claim 1, wherein the power module is a rechargeable battery, a commercial power supply module or a solar power supply module.
CN202211312979.7A 2022-10-25 2022-10-25 Automatic testing arrangement of pipeline corrosion rate Pending CN115541486A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115598047A (en) * 2022-10-25 2023-01-13 西南石油大学（Cn） Automatic pipeline corrosion rate measuring instrument and application thereof
CN115598047B (en) * 2022-10-25 2024-10-22 西南石油大学 Automatic measuring instrument for corrosion rate of pipeline and application thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115598047A (en) * 2022-10-25 2023-01-13 西南石油大学（Cn） Automatic pipeline corrosion rate measuring instrument and application thereof
CN115598047B (en) * 2022-10-25 2024-10-22 西南石油大学 Automatic measuring instrument for corrosion rate of pipeline and application thereof

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