CN104233314A - Dynamic interference potential test system for buried pipeline - Google Patents
Dynamic interference potential test system for buried pipeline Download PDFInfo
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- CN104233314A CN104233314A CN201410485962.0A CN201410485962A CN104233314A CN 104233314 A CN104233314 A CN 104233314A CN 201410485962 A CN201410485962 A CN 201410485962A CN 104233314 A CN104233314 A CN 104233314A
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Abstract
The invention discloses a dynamic interference potential test system for a buried pipeline. The dynamic interference potential test system comprises a polarized probe, a high-frequency data acquisition device and a data processing device. As the polarized probe replaces a traditional copper sulfate reference electrode, valid data can be provided for corrosion risk assessment of a pipeline at a defect point of the corrosion protection layer of a simulating pipeline, and at the same time potential errors brought by the placement position of the traditional copper sulfate reference electrode are avoided; excavation and measurement for soil electric resistance around the buried pipeline are not needed, a test method is simplified, and further errors brought by orientation of measurement for soil electric resistance are eliminated. The high-frequency data acquisition device is used for acquiring data, and then the data is transmitted to the data processing device for Fourier transform, so that conversion from time domain to frequency domain of the AC-DC superimposed dynamic potential can be obtained, the frequency component of stray current can be accurately judged, and the size of DC potential and the source and size of AC interference can be accurately obtained.
Description
Technical field
The application relates to tubing system technical field, particularly relates to a kind of buried pipeline dynamic disturbance potential test system.
Background technology
The stray current that pipeline peripheral electrical system produces, can produce to buried metal pipeline and affiliated facility thereof and have a strong impact on, belong to dynamic disturbance, the particularly corrosion that causes of alternating-current electric system, there is intensity high, scope is wide, randomness is strong, the features such as difficulty of governance is large, pipe-to-soil potential presents the change of dynamic wide cut, far beyond galvanic protection requirement, there is high normal potential and high negative potential as a rule, reach as high as 8 ~ 9V, cause local location seriously corroded, for the steel pipe of wall thickness 8 ~ 9mm, fast then some months is just bored a hole, have a strong impact on the safe operation of pipeline.
At present; for the corrosion risk evaluating method that stray current produces buried oil and gas pipes; be based upon on the basis of galvanic protection validity; mainly by measuring channel-soil current potential; then comparing with the judge value of correlation standard and judge, particularly judging by measuring switch-off potential.But this traditional testing method cannot and the pipe-to-soil potential Measurement accuracy of dynamic change of unknown origin to interfering source, and then accurately cannot judge the annoyance level of stray current and corrosion risk.
Usually the means adopted for the evaluation of alternating current disturbance corrosion risk are: by the pipeline voltage of alternating current recorded, again in conjunction with existing sign pipeline voltage and electron current density equation J=8U/ (π ρ d), AC current density can be calculated, but, this voltage adopts the interchange shelves of testing apparatus to carry out independent measurement, in fact, the virtual voltage that independent alternating-current and direct current superposition produce may produce asymmetric alternating-current or even pulsed voltage.
Summary of the invention
Invention provides a kind of buried pipeline dynamic disturbance potential test system, with the technical problem that the interference corrosion risk evaluating method accuracy solving prior art existence is lower.
For solving the problems of the technologies described above, the invention provides a kind of buried pipeline dynamic disturbance potential test system, described system comprises: polarized probe, high-frequency data gathering device, data processing equipment; Be provided with steel disk bottom described polarized probe, described steel disk is connected by the detective pole of the first wire with described buried pipeline, then introduces polarization, thus makes described steel disk have identical polarized potential with described buried pipeline; Described high-frequency data gathering device is connected between the second wire of described steel disk and the built-in reference electrode wire of described detective pole, wherein, the built-in reference electrode wire of described detective pole is provided with switch; Described high-frequency data gathering device is used for measuring the pipe-to-soil potential of described buried pipeline, obtains take off data; Described data processing equipment connects described high-frequency data gathering device, for carrying out fourier transformation to described take off data, obtain the alternating-current place value of direct current place value and each frequency, then by the alternating-current place value of described direct current place value and each frequency respectively with standard value comparison, obtain corrosion risk assessment result.
Preferably, described polarized probe is imbedded in the soil around described buried pipeline.
Preferably, the sample frequency of high-frequency data gathering device is more than or equal to 100Hz.
By one or more technical scheme of the present invention, the present invention has following beneficial effect or advantage:
The invention provides a kind of buried pipeline dynamic disturbance potential test system, comprise polarized probe, high-frequency data gathering device, data processing equipment.Replace traditional copper sulfate reference electrode can judge to provide valid data for the corrosion risk of deficiency of protection coating point place, simulative tube road pipeline by polarized probe, avoid the potential errors that traditional copper sulfate reference electrode installation position brings simultaneously, and without the need to excavating and measuring the electric resistance of soil around buried pipeline, simplify testing method and then eliminate electric resistance of soil and measure the error brought in orientation.By high-frequency data gathering device image data, then send data processing equipment to and carry out fourier transformation, can show that alternating current-direct current superposes the conversion of time domain to frequency domain of dynamic current potential, the frequency content of stray current can be judged exactly, accurately can draw the size of DC potential, the source of alternating current disturbance and size.
Accompanying drawing explanation
Fig. 1 is the scheme of installation of buried pipeline dynamic disturbance potential test system in the embodiment of the present invention;
Fig. 2 is AC and DC superposition dynamic electric bit test data plot in the embodiment of the present invention;
Fig. 3 is the frequency domain figure adopting Fourier transform to draw in the embodiment of the present invention.
Embodiment
In order to make the application the technical staff in the technical field more clearly understand the application, below in conjunction with accompanying drawing, by specific embodiment, technical scheme is described in detail.
Buried pipeline dynamic disturbance potential test system involved in the present invention comprises high-frequency data gathering device 1, data processing equipment 2, polarized probe 3; Wherein, data processing equipment 2 is provided with Fourier transform data software.
Please refer to Fig. 1 below, is the scheme of installation of buried pipeline dynamic disturbance potential test system.The sample frequency of high-frequency data gathering device 1 is more than or equal to 100Hz.
The soil 5 around buried pipeline 4 is imbedded in the bottom of polarized probe 3, and buried pipeline 4 is generally round shape, and the bottom of polarized probe 3 is generally embedded in the soil 5 around buried pipeline 4 within 0 ~ 1 meter.
The bottom of polarized probe 3 is provided with steel disk, and steel disk is by the first wire connecting test stake 6, and detective pole 6 connects and buried pipeline 4.Polarized probe 3 introduces polarization, thus makes steel disk have identical polarized potential with buried pipeline 4.Steel disk is now equivalent to simulate test piece, for carrying out the detection of non-power-off, no-dig technique to the pipe-to-soil potential of buried pipeline 4, that is: do not need buried pipeline 4 to have metal exposed point and without the need to measuring channel surrounding soil resistivity, solve the problem that buried pipeline 4 cannot be measured without dew iron; And directly measure alternating current-direct current superposition, dynamic actual potential, the numerical fault effectively avoiding power-off or independent measurement AC and DC to bring thus cause the erroneous judgement of corrosion risk.
High-frequency data gathering device 1 is connected between the second wire of steel disk and the built-in reference electrode wire of described detective pole.Wherein, the built-in reference electrode wire of detective pole is provided with switch 6.
Described high-frequency data gathering device 1, for measuring the pipe-to-soil potential of described buried pipeline 4, obtains take off data.
Described data processing equipment 2 connects described high-frequency data gathering device 1, for carrying out fourier transformation to described take off data, obtain the alternating-current place value of direct current place value and each frequency, then by the alternating-current place value of described direct current place value and each frequency respectively with standard value comparison, obtain corrosion risk assessment result.
Specifically, after said apparatus connects, then close switch 6, then by the interaction of each device, can obtain corrosion risk assessment result.
Fig. 2 is AC and DC superposition dynamic electric bit test data plot.
After carrying out field survey by method described in Fig. 1, gained take off data fluctuation, randomness are very large, cannot accurately judge its interference type, therefore, after acquisition take off data, can be processed by data processing equipment 2.As shown in Figure 3, be the frequency domain figure adopting Fourier transform to draw, can show that its flip-flop is for-0.3V, the frequency of interchange is power frequency 50Hz, and its magnitude of voltage is 0.2V.According to relevant industry standard, can obtain, corresponding flip-flop just relatively pipeline spontaneous potential is comparatively large, illustrates that this pipeline receives more serious DC stray current interference, should take the measure of direct current drainage; But can think that the alternative stray current interference that this pipeline is subject to is little according to standard.
Comprehensively known, Fourier analysis has good using value in actual mechanical process, can show that alternating current-direct current superposes the conversion of time domain to frequency domain of dynamic current potential, the frequency content of stray current can be judged exactly, accurately can draw the size of DC potential, the source of alternating current disturbance and size, be conducive to the root of find problem.
By one or more embodiment of the present invention, the present invention has following beneficial effect or advantage:
The invention provides a kind of buried pipeline dynamic disturbance potential test system, comprise polarized probe, high-frequency data gathering device, data processing equipment.Replace traditional copper sulfate reference electrode can judge to provide valid data for the corrosion risk of deficiency of protection coating point place, simulative tube road pipeline by polarized probe, avoid the potential errors that traditional copper sulfate reference electrode installation position brings simultaneously, and without the need to excavating and measuring the electric resistance of soil around buried pipeline, simplify testing method and then eliminate electric resistance of soil and measure the error brought in orientation.By high-frequency data gathering device image data, then send data processing equipment to and carry out fourier transformation, can show that alternating current-direct current superposes the conversion of time domain to frequency domain of dynamic current potential, the frequency content of stray current can be judged exactly, accurately can draw the size of DC potential, the source of alternating current disturbance and size.
Although described the preferred embodiment of the application, one of ordinary skilled in the art once obtain the basic creative concept of cicada, then can make other change and amendment to these embodiments.So claims are intended to be interpreted as comprising preferred embodiment and falling into all changes and the amendment of the application's scope.
Obviously, those skilled in the art can carry out various change and modification to the application and not depart from the spirit and scope of the application.Like this, if these amendments of the application and modification belong within the scope of the application's claim and equivalent technologies thereof, then the application is also intended to comprise these change and modification.
Claims (3)
1. a buried pipeline dynamic disturbance potential test system, is characterized in that, described system comprises: polarized probe, high-frequency data gathering device, data processing equipment;
Be provided with steel disk bottom described polarized probe, described steel disk is connected by the detective pole of the first wire with described buried pipeline, then introduces polarization, thus makes described steel disk have identical polarized potential with described buried pipeline;
Described high-frequency data gathering device is connected between the second wire of described steel disk and the built-in reference electrode wire of described detective pole, wherein, the built-in reference electrode wire of described detective pole is provided with switch; Described high-frequency data gathering device is used for measuring the pipe-to-soil potential of described buried pipeline, obtains take off data;
Described data processing equipment connects described high-frequency data gathering device, for carrying out fourier transformation to described take off data, obtain the alternating-current place value of direct current place value and each frequency, then by the alternating-current place value of described direct current place value and each frequency respectively with standard value comparison, obtain corrosion risk assessment result.
2. the system as claimed in claim 1, is characterized in that, described polarized probe is imbedded in the soil around described buried pipeline.
3. the system as claimed in claim 1, is characterized in that, the sample frequency of high-frequency data gathering device is more than or equal to 100Hz.
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| CN201410485962.0A CN104233314B (en) | 2014-09-22 | 2014-09-22 | A kind of buried pipeline dynamic disturbance potential test system |
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| CN201410485962.0A CN104233314B (en) | 2014-09-22 | 2014-09-22 | A kind of buried pipeline dynamic disturbance potential test system |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040001A (en) * | 2015-07-06 | 2015-11-11 | 中国石油化工股份有限公司 | Cathode protection data collecting device for buried pipeline |
| CN105586596A (en) * | 2016-03-28 | 2016-05-18 | 沈阳龙昌管道检测中心 | Pipeline corrosion and protection experiment system |
| CN105822907A (en) * | 2016-05-17 | 2016-08-03 | 南方电网科学研究院有限责任公司 | Control method for pipe-to-soil potential of buried metal pipeline |
| CN105887096A (en) * | 2016-04-27 | 2016-08-24 | 天津智晟济科技发展有限公司 | Alternating current-direct current channel separation type intelligent cathodic protection potential data acquisition instrument |
| CN106526296A (en) * | 2015-09-11 | 2017-03-22 | 成都娇子意航星科技有限公司 | Stray current measuring method based on fast Fourier transform |
| CN107561342A (en) * | 2017-08-23 | 2018-01-09 | 南方电网科学研究院有限责任公司 | The determination method and device of buried metal pipeline voltage under a kind of polarization characteristic |
| CN109323131A (en) * | 2018-12-03 | 2019-02-12 | 北京市燃气集团有限责任公司 | A kind of gas ductwork metro stray current Interference Detection system and its method for arranging |
| CN109782046A (en) * | 2019-01-25 | 2019-05-21 | 中国电力科学研究院有限公司 | A kind of method and system measuring buried metal pipeline polarization potential |
| CN110066997A (en) * | 2019-04-30 | 2019-07-30 | 青岛雅合科技发展有限公司 | Outer corrosion alternating current-direct current method for comprehensive detection |
| CN110286083A (en) * | 2019-07-19 | 2019-09-27 | 中国石化销售股份有限公司华中分公司 | Outer corrosion method for comprehensive detection |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN111220536A (en) * | 2018-11-23 | 2020-06-02 | 中国石油天然气股份有限公司 | Method, device and system for detecting corrosion probability of pipeline |
| CN111562423A (en) * | 2020-04-17 | 2020-08-21 | 北京市燃气集团有限责任公司 | Method and device for calculating influence range of subway stray current on buried pipeline |
| CN111796159A (en) * | 2020-07-20 | 2020-10-20 | 青岛钢研纳克检测防护技术有限公司 | Method for detecting whether composite type drainage device is damaged or not on site |
| CN113640206A (en) * | 2021-06-22 | 2021-11-12 | 苏州市轨道交通集团有限公司 | Method and device for calculating corrosion rate of pipeline under dynamic direct current interference |
| CN114438501A (en) * | 2021-12-15 | 2022-05-06 | 安科工程技术研究院（北京）有限公司 | Pipeline potential change characteristic analysis method, pipeline potential change characteristic analysis device, readable medium and terminal |
| CN115216775A (en) * | 2022-06-28 | 2022-10-21 | 浙江浙能天然气运行有限公司 | Cathode protection system based on dynamic potential |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1456879A (en) * | 2003-03-18 | 2003-11-19 | 天津大学 | Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection |
| WO2004064084A2 (en) * | 2003-01-03 | 2004-07-29 | Nucore, Inc. | Self-damped inductor |
| CN102590459A (en) * | 2012-03-09 | 2012-07-18 | 中国石油天然气股份有限公司 | System and method for detecting and evaluating corrosion of buried pipeline |
| CN202337827U (en) * | 2011-07-29 | 2012-07-18 | 中国石油天然气股份有限公司 | Buried anti-interference polarized probe |
-
2014
- 2014-09-22 CN CN201410485962.0A patent/CN104233314B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004064084A2 (en) * | 2003-01-03 | 2004-07-29 | Nucore, Inc. | Self-damped inductor |
| CN1456879A (en) * | 2003-03-18 | 2003-11-19 | 天津大学 | Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection |
| CN202337827U (en) * | 2011-07-29 | 2012-07-18 | 中国石油天然气股份有限公司 | Buried anti-interference polarized probe |
| CN102590459A (en) * | 2012-03-09 | 2012-07-18 | 中国石油天然气股份有限公司 | System and method for detecting and evaluating corrosion of buried pipeline |
Cited By (25)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105040001A (en) * | 2015-07-06 | 2015-11-11 | 中国石油化工股份有限公司 | Cathode protection data collecting device for buried pipeline |
| CN106526296A (en) * | 2015-09-11 | 2017-03-22 | 成都娇子意航星科技有限公司 | Stray current measuring method based on fast Fourier transform |
| CN105586596A (en) * | 2016-03-28 | 2016-05-18 | 沈阳龙昌管道检测中心 | Pipeline corrosion and protection experiment system |
| CN105887096A (en) * | 2016-04-27 | 2016-08-24 | 天津智晟济科技发展有限公司 | Alternating current-direct current channel separation type intelligent cathodic protection potential data acquisition instrument |
| CN105822907A (en) * | 2016-05-17 | 2016-08-03 | 南方电网科学研究院有限责任公司 | Control method for pipe-to-soil potential of buried metal pipeline |
| CN107561342B (en) * | 2017-08-23 | 2019-10-25 | 南方电网科学研究院有限责任公司 | The determination method and device of buried metal pipeline voltage under a kind of polarization characteristic |
| CN107561342A (en) * | 2017-08-23 | 2018-01-09 | 南方电网科学研究院有限责任公司 | The determination method and device of buried metal pipeline voltage under a kind of polarization characteristic |
| CN111220536A (en) * | 2018-11-23 | 2020-06-02 | 中国石油天然气股份有限公司 | Method, device and system for detecting corrosion probability of pipeline |
| CN109323131A (en) * | 2018-12-03 | 2019-02-12 | 北京市燃气集团有限责任公司 | A kind of gas ductwork metro stray current Interference Detection system and its method for arranging |
| CN109782046A (en) * | 2019-01-25 | 2019-05-21 | 中国电力科学研究院有限公司 | A kind of method and system measuring buried metal pipeline polarization potential |
| CN109782046B (en) * | 2019-01-25 | 2022-05-20 | 中国电力科学研究院有限公司 | Method and system for measuring polarization potential of buried metal pipeline |
| CN110066997A (en) * | 2019-04-30 | 2019-07-30 | 青岛雅合科技发展有限公司 | Outer corrosion alternating current-direct current method for comprehensive detection |
| CN110286083B (en) * | 2019-07-19 | 2021-12-07 | 中国石油化工股份有限公司 | Comprehensive detection method for external corrosion |
| CN110286083A (en) * | 2019-07-19 | 2019-09-27 | 中国石化销售股份有限公司华中分公司 | Outer corrosion method for comprehensive detection |
| CN110849799A (en) * | 2019-11-07 | 2020-02-28 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN110849799B (en) * | 2019-11-07 | 2022-05-13 | 常州大学 | Device for researching interference of stray current on buried pipeline cathode protection system |
| CN111562423A (en) * | 2020-04-17 | 2020-08-21 | 北京市燃气集团有限责任公司 | Method and device for calculating influence range of subway stray current on buried pipeline |
| CN111562423B (en) * | 2020-04-17 | 2022-08-05 | 北京市燃气集团有限责任公司 | Method and device for calculating influence range of subway stray current on buried pipeline |
| CN111796159A (en) * | 2020-07-20 | 2020-10-20 | 青岛钢研纳克检测防护技术有限公司 | Method for detecting whether composite type drainage device is damaged or not on site |
| CN113640206B (en) * | 2021-06-22 | 2024-05-10 | 苏州市轨道交通集团有限公司 | Pipeline corrosion rate calculation method and device under dynamic direct current interference |
| CN113640206A (en) * | 2021-06-22 | 2021-11-12 | 苏州市轨道交通集团有限公司 | Method and device for calculating corrosion rate of pipeline under dynamic direct current interference |
| CN114438501A (en) * | 2021-12-15 | 2022-05-06 | 安科工程技术研究院（北京）有限公司 | Pipeline potential change characteristic analysis method, pipeline potential change characteristic analysis device, readable medium and terminal |
| CN114438501B (en) * | 2021-12-15 | 2024-04-19 | 安科工程技术研究院（北京）有限公司 | Pipeline potential change characteristic analysis method, analysis device, readable medium and terminal |
| CN115216775B (en) * | 2022-06-28 | 2024-04-26 | 国家管网集团浙江省天然气管网有限公司 | Cathode protection system based on dynamic potential |
| CN115216775A (en) * | 2022-06-28 | 2022-10-21 | 浙江浙能天然气运行有限公司 | Cathode protection system based on dynamic potential |
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Effective date of registration: 20170301 Address after: 100007 Dongcheng District, Dongzhimen, China, North Street, No. 9 Oil Mansion, No. Patentee after: China National Petroleum Corporation Patentee after: China Petroleum Pipeline Bureau Engineering Co., Ltd. Address before: 100007 Beijing, Dongzhimen, North Street, No. 9, No. Patentee before: China National Petroleum Corporation Patentee before: China Petroleum and Natural Gas Pipeline Bureau |