CN1234008C - Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection - Google Patents
Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection Download PDFInfo
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- CN1234008C CN1234008C CN 03119386 CN03119386A CN1234008C CN 1234008 C CN1234008 C CN 1234008C CN 03119386 CN03119386 CN 03119386 CN 03119386 A CN03119386 A CN 03119386A CN 1234008 C CN1234008 C CN 1234008C
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Abstract
The present invention discloses a method and a device for comprehensively measuring a pipe ground electric potential and a ground surface electric potential for a cathodic protective pipeline, which belongs to the detection technology of buried pipelines. The method adopts at least a reference electrode of the ground electric potential and a reference electrode of the ground surface electric potential of a detecting pipe to synchronously measure, the IR drop is eliminated by adopting an instant interrupted current method or an extra excitation current signal method in the measuring process, and test data collected by a recorder is analyzed by a microcomputer to determine a true pipe ground electric potential and a true ground surface electric potential. The device for realizing the technology comprises a reference electrode set, a data collecting recorder, a signal generator, a current interruption device, a distance measurer and a microcomputer analysis system, wherein the data collecting recorder, the current interruption device and the signal generator are synchronously set by adopting GPS. Because the present invention synchronously records gradients of the pipe ground electric potential and the ground surface electric potential, more realistic and abundant information can be obtained, and the detection efficiency is high.
Description
Technical field
The present invention relates to a kind of pipe-to-soil potential and surface potential gradient method for comprehensive detection and device of cathodic protection pipeline, belong to detection technique buried pipeline.
Background technology
Along with the exploitation of hydrocarbon resources and the urgency of energy market increase, pipeline transportation has worldwide obtained develop rapidly, has become the lifeblood of national economy; Aspect FLUID TRANSPORTATION, pipeline transportation has its outstanding advantage of not replacing especially.Yet, along with increasing of pipeline, manage the growth in age, pipeline accident also takes place again and again.The reason that causes accident is varied, and wherein Corrosion of Pipeline is the key factor that influences buried pipeline system reliability and serviceable life.Carry out anticorrosion at the method that corrosion generally takes cathodic protection and corrosion-inhibiting coating to combine.
In the operation maintenance of pipeline, the validity of cathodic protection and the integrality of corrosion-inhibiting coating are the important parameters that needs detection.When estimating the cathodic protection performance, one of most important index is exactly a pipe-to-soil potential, and detective pole by pipeline and contrast electrode are (as the saturated CuSO of Cu/
4) just can measure on the face of land.Because there is resistance in the soil media between tested pipeline and the contrast electrode, when electric current by the time, can produce soil IR voltage drop, the measurement of pipe-to-soil potential is caused error.In all multi-methods that elimination IR falls, on detection efficiency and on-the-spot general applicability, the instant cut-off method is more suitable.After disconnecting cathodic protection current, IR falls and can disappear in very short time, and the disappearance process of pipeline polarization is then relatively slow.Therefore, with the method for instantaneous interrupt pipe protective current, the potential value when measuring momentary power failure is thought real pipe-to-soil potential.In order to obtain the pipe-to-soil potential of pipeline each point along the line, with contrast electrode on the ground directly over the pipeline pointwise move the potential difference (PD) between potential measurement apparatus measures record each point place's contrast electrode and the pipeline detective pole.Close spacing potential test (Close IntervalPotential Survey; CIPS) be exactly to adopt the momentary power failure method; carry out pipeline potential test along the line with closeer interval, obtain pipe-to-soil potential distribution plan along the line, and estimate the cathodic protection performance and judge the anticorrosive coat defective according to potential image.
Though the CIPS method can write down pipe-to-soil potential automatically, testing efficiency is higher, but because this method is only at pipeline direction detection record along the line pipe-to-soil potential, therefore be subjected to the influence of other pipeline around the pipeline etc. easily, can't judge the stray current distribution situation that pipeline is along the line, be difficult to realize the anticorrosive coat defective is accurately located.Present DC voltage gradient method (DC VoltageGradient; DCVG); adopt two contrast electrodes and the higher milivoltmeter of sensitivity; detect the anticorrosive coat breaking point by the method that detects the ground surface electric potential gradient; the anticorrosive coat breaking point is had high orientation precision, but the DCVG method can not write down the pipeline cathode protection current potential, can not judge whether pipeline corrodes and limitation such as be subjected to that stray current influences easily.
Summary of the invention
The object of the present invention is to provide a kind of pipe-to-soil potential and surface potential gradient method for comprehensive detection and device of cathodic protection pipeline, this method has the advantage of CIPS and DCVG concurrently, and the device of employing is simple, uses reliable.
Present technique is achieved in that
A kind of pipe-to-soil potential of cathodic protection pipeline and surface potential gradient method for comprehensive detection is characterized in that comprising following process:
1) the contrast electrode group is set, wherein, the contrast electrode that is arranged at directly over the pipeline links to each other with the pipeline detective pole by cable, and is used for the pipe-to-soil potential of measuring channel, and two contrast electrodes that are arranged at the conduit axis both sides respectively symmetrically are used to measure the surface potential gradient;
2) adopt GPS to be provided with synchronously data acquiring and recording device and current interruptions device and signal generation apparatus, utilize the current interruptions device, the staged electric current that is produced by signal generation apparatus is applied on the pipe under test by the interim impressed current anode of laying in the cathodic protection;
3) by data acquiring and recording device synchronous acquisition record pipe-to-soil potential and surface potential gradient data, by the microcomputer analysis system data of gathering are analyzed, and provided pipe-to-soil potential and surface potential gradient.
Realize the device of above-mentioned detection method, it is characterized in that, comprise the impressed current anode, signal generation apparatus, current interruptions device, pipeline detective pole, stadimeter, data acquiring and recording device, contrast electrode group, cathodic protection equipment of interim laying, for applying the impressed current anode that cathodic protection is buried underground; Wherein, described current interruptions device is two, an end of one of them current interruptions device by cathodic protection equipment with link to each other for applying the impressed current anode that cathodic protection buries underground, the other end links to each other with first detective pole; One end of another current interruptions device links to each other with the impressed current anode of interim laying by signal generation apparatus, and the other end links to each other with the 3rd detective pole; One end of data acquiring and recording device links to each other with the contrast electrode group, the other end links to each other with second detective pole by stadimeter, described first detective pole, second detective pole, the 3rd detective pole set gradually along duct orientation, and described contrast electrode group, data acquiring and recording device and stadimeter are successively set between first detective pole and second detective pole along duct orientation respectively; Described contrast electrode group is 3 electrode systems or 4 electrode systems, the arrangement mode of described 3 electrode systems is that a contrast electrode is positioned at directly over the pipeline, two contrast electrodes are symmetrically located at the conduit axis both sides respectively in addition, and the both sides contrast electrode is apart from middle contrast electrode 10-30cm; The arrangement mode of described 4 electrode systems is for to be provided with two contrast electrodes along duct orientation directly over pipeline, the distance between these two contrast electrodes is 10-30cm, and two contrast electrodes are put in the conduit axis both sides symmetrically in addition.
Adopt above-mentioned technology can detect and write down pipe-to-soil potential and surface potential gradient simultaneously; and utilizing the ladder pumping signal to fall the influence of pipe-to-soil potential being measured with the soil stray current to eliminate IR, the evaluation of anticathode protective value and anticorrosive coat defect location can both obtain good result.The research main points of this project are: how according to the situation of the pipe-to-soil potential of survey record and surface potential gradient analysis cathodic protection performance, stray current and carry out the anticorrosive coat defect location.
Pipe-to-soil potential of the present invention and surface potential gradient method for comprehensive detection have been drawn the advantage separately of CIPS and DCVG, and its characteristics are mainly reflected in:
1, synchronous acquisition record pipe-to-soil potential and surface potential gradient, the abundant information of obtaining, detection efficiency height.
2, utilize current interruptions device interruption cathodic protection current can eliminate IR and fall the influence that pipe-to-soil potential is measured; At the influence of soil stray current, signal generator produces the grading current excitation simultaneously, utilizes soil electric potential gradient method to eliminate IR and falls, to obtain real pipe-to-soil potential.
3, contrast electrode group flexible design can change the placement layout type of number of electrodes and electrode as required, and electrode separation is adjustable.
4, the quantity that increases contrast electrode can obtain because anticorrosive coat defective and the electrical field shape that forms at ground surface, thereby can carry out the analysis of anticorrosive coat defect shape.
5, the design of data acquiring and recording device is light and handy, and is convenient with the interface of contrast electrode group and microcomputer.
Description of drawings
Fig. 1: pipe-to-soil potential and surface potential gradient comprehensive detection system synoptic diagram;
Fig. 2: pipe-to-soil potential and surface potential gradient comprehensive detection three electrode horizontal positioned are faced throwing face synoptic diagram;
Fig. 3: pipe-to-soil potential and surface potential gradient comprehensive detection four electrode schematic top plan view;
Among the figure: 1 is pipeline, and 2 is interim impressed current anode, and 3 is signal generation apparatus, and 4 is the current interruptions device; 5 is the pipeline detective pole, and 6 is stadimeter, and 7 is the data acquiring and recording device; 8 is the contrast electrode group, and 9 are cathodic protection equipment, and 10 for applying the impressed current anode that cathodic protection is buried underground.
Embodiment
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
As shown in Figure 1: the pipe-to-soil potential of cathodic protection pipeline and surface potential gradient comprehensive detection system are made up of impressed current anode 2, signal generation apparatus 3, current interruptions device 4, stadimeter 6, data acquiring and recording device 7, the contrast electrode group 8 of interim laying.1 is pipeline among the figure, and 5 is the pipeline detective pole, and 9 are cathodic protection equipment, and 10 for applying the impressed current anode that cathodic protection is buried underground.
Introduce the actual detected step below:
Step 1: data acquiring and recording device 7 and current interruptions device 4 and signal generation apparatus 3 are provided with synchronously by GPS, then the working electrode output terminal in the electrode interface of data acquiring and recording device 7 is linked to each other with pipeline detective pole 5 by the conductive paint envelope curve, and this enameled wire to pass through stadimeter 6.The signal input part of data acquiring and recording device 7 connects contrast electrode group 8, is used for obtaining pipe-to-soil potential and surface potential gradient.Stadimeter 6 above-mentioned, data acquiring and recording device 7 are carried by operating personnel.Contrast electrode group 8 is made the form of combination feeler lever, is being held with pipeline by operating personnel and is moving.
Step 2: regulate the number of poles and the placement scheme of contrast electrode group 8, as Fig. 2, Fig. 3 or similar combination.Current potential when the synchro measure record applies exciting current between contrast electrode 8 (2) and the pipeline detective pole and the potential difference (PD) between contrast electrode 8 (1), 8 (3), 8 (4) and the contrast electrode 8 (2).
Step 3: do not change the position of contrast electrode, when exciting current changes, the potential value in the same survey record step 2.
Step 4: the contrast electrode group is moved a segment distance (about 1 meter, by the decision of operating personnel's step-length), potential measurement and record in the repeating step 2,3 along pipeline.
Step 5: when the cable length between working electrode in the electrode interface of data acquiring and recording device 7 and the pipeline detective pole can not continue to measure or when arriving new detective pole, the working electrode leading foot is linked to each other with new detective pole.
Step 6: potential measurement and record in the repeating step 2,3,4, up to detecting the complete strips pipeline.
Step 7: the data of data acquiring and recording device 7 are sent in the microcomputer; obtain pipeline true pipe-to-soil potential along the line and surface potential gradient; and then draw pipeline Potential distribution along the line, carry out cathodic protection performance and pipeline Stray Current along the line and corrosion-inhibiting coating defect location.
The present invention all combinations and method open and that disclose can be by using for reference this paper disclosure, although combination of the present invention and method are described by preferred embodiment, but those skilled in the art obviously can be spliced method and apparatus as herein described in not breaking away from content of the present invention, spirit and scope or change, or increase and decrease some parts, more particularly, the replacement that all are similar and change apparent to those skilled in the artly, they are regarded as being included in spirit of the present invention, scope and the content.
Claims (2)
1. the pipe-to-soil potential of a cathodic protection pipeline and surface potential method for comprehensive detection is characterized in that comprising following process:
1) the contrast electrode group is set, wherein, the contrast electrode that is arranged at directly over the pipeline links to each other with the pipeline detective pole by cable, and is used for the pipe-to-soil potential of measuring channel, and two contrast electrodes that are arranged at the conduit axis both sides respectively symmetrically are used to measure the surface potential gradient;
2) adopt GPS to be provided with synchronously data acquiring and recording device and current interruptions device and signal generation apparatus, utilize the current interruptions device, the staged electric current that is produced by signal generation apparatus is applied on the pipe under test by the interim impressed current anode of laying in the cathodic protection;
3) by data acquiring and recording device synchronous acquisition record pipe-to-soil potential and surface potential gradient data, by the microcomputer analysis system data of gathering are analyzed, and provided pipe-to-soil potential and surface potential gradient.
2. realize the pipe-to-soil potential of the described cathodic protection pipeline of claim 1 and the device of surface potential method for comprehensive detection for one kind, it is characterized in that, comprise the impressed current anode, signal generation apparatus, current interruptions device, pipeline detective pole, stadimeter, data acquiring and recording device, contrast electrode group, cathodic protection equipment of interim laying, for applying the impressed current anode that cathodic protection is buried underground; Wherein, described current interruptions device is two, an end of one of them current interruptions device by cathodic protection equipment with link to each other for applying the impressed current anode that cathodic protection buries underground, the other end links to each other with first detective pole; One end of another current interruptions device links to each other with the impressed current anode of interim laying by signal generation apparatus, and the other end links to each other with the 3rd detective pole; One end of data acquiring and recording device links to each other with the contrast electrode group, the other end links to each other with second detective pole by stadimeter, described first detective pole, second detective pole, the 3rd detective pole set gradually along duct orientation, and described contrast electrode group, data acquiring and recording device and stadimeter are successively set between first detective pole and second detective pole along duct orientation respectively; Described contrast electrode group is 3 electrode systems or 4 electrode systems, the arrangement mode of described 3 electrode systems is that a contrast electrode is positioned at directly over the pipeline, two contrast electrodes are symmetrically located at the conduit axis both sides respectively in addition, and the both sides contrast electrode is apart from middle contrast electrode 10-30cm; The arrangement mode of described 4 electrode systems is for to be provided with two contrast electrodes along duct orientation directly over pipeline, the distance between these two contrast electrodes is 10-30cm, and two contrast electrodes are put in the conduit axis both sides symmetrically in addition.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03119386 CN1234008C (en) | 2003-03-18 | 2003-03-18 | Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection |
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| CN 03119386 CN1234008C (en) | 2003-03-18 | 2003-03-18 | Comprehensively measuring method and device for electric potentials of pipe earth and ground surface for cathodic pipeline pretection |
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| CN1456879A CN1456879A (en) | 2003-11-19 |
| CN1234008C true CN1234008C (en) | 2005-12-28 |
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| CN101344217B (en) * | 2008-08-28 | 2012-02-29 | 中国石油大学(北京) | Apparatus and method for measuring earth induction current and pipe-to-soil potential of buried pipe |
| CN102337542A (en) * | 2011-07-19 | 2012-02-01 | 华电能源股份有限公司 | Detection method and apparatus for buried metal pipeline cathode protection system |
| CN102954754A (en) * | 2011-08-19 | 2013-03-06 | 丹阳奥恩能源科技发展有限公司 | Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline |
| CN103540939B (en) * | 2012-07-12 | 2016-06-08 | 中国石油天然气股份有限公司 | A kind of pipeline potentiostat power-off measurement and protector |
| CN104032309A (en) * | 2013-03-06 | 2014-09-10 | 中国石油天然气股份有限公司 | Clock drift correction method in cathodic protection potential synchronous detection |
| CN104233314B (en) * | 2014-09-22 | 2016-08-17 | 中国石油天然气集团公司 | A kind of buried pipeline dynamic disturbance potential test system |
| 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 |
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| CN109813764A (en) * | 2018-12-18 | 2019-05-28 | 中国石油天然气股份有限公司 | The evaluation method and device of through section pipeline anticorrosion coating insulation performance |
| CN109487277A (en) * | 2018-12-29 | 2019-03-19 | 江苏科盾检测技术有限公司 | A kind of buried pipe erosion resistant coating and cathodic protection detection system |
| CN109917720A (en) * | 2019-04-04 | 2019-06-21 | 中国石油化工股份有限公司 | In-service steel pipe stray electrical current prison detection and cathodic protection power control and method |
| CN111270246B (en) * | 2020-02-12 | 2021-06-04 | 同济大学 | Buried steel pipeline cathode protection state detection and early warning processing system |
| CN111575715A (en) * | 2020-05-09 | 2020-08-25 | 中核武汉核电运行技术股份有限公司 | Nuclear power plant buried pipeline anticorrosive coating defect detection system |
| CN111575716A (en) * | 2020-05-09 | 2020-08-25 | 中核武汉核电运行技术股份有限公司 | Nuclear power plant buried pipeline cathodic protection effectiveness monitoring system |
| CN114717564B (en) * | 2021-01-05 | 2023-09-26 | 中国石油天然气股份有限公司 | Method and device for determining cathodic protection potential of pipeline |
| CN113686772A (en) * | 2021-09-13 | 2021-11-23 | 国机传感科技有限公司 | Comprehensive external detection device for buried steel long oil and gas pipeline |
| CN114414461A (en) * | 2021-12-17 | 2022-04-29 | 中石化管道技术服务有限公司 | Protective potential satellite synchronous measurement device with positioning current pipeline and method |
| CN114993928B (en) * | 2022-05-26 | 2024-04-19 | 徐州中矿传动轨道科技有限公司 | Buried pipeline coating defect positioning device and method under stray current corrosion |
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