CN104947118A - Flexible anode breakpoint detecting method - Google Patents
Flexible anode breakpoint detecting method Download PDFInfo
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- CN104947118A CN104947118A CN201510337177.5A CN201510337177A CN104947118A CN 104947118 A CN104947118 A CN 104947118A CN 201510337177 A CN201510337177 A CN 201510337177A CN 104947118 A CN104947118 A CN 104947118A
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Abstract
The invention discloses a flexible anode breakpoint detecting method for detecting a breakpoint of a flexible anode of a cathode protection system. The detecting method adopts a detecting device; the device comprises a potentiostat, an anode cable electrically connected with the potentiostat and the flexible anode, a copper sulfate reference electrode, a measuring lead, a digital multimeter having a black meter pen to be electrically connected with the copper sulfate reference electrode through the measuring lead, and a test pile electrically connected with a buried metal pipe through a test cable in the test pile. The method comprises the following steps: the potentiostat is opened to realize the periodical connection/disconnection; the copper sulfate reference electrode is put in different measuring points in sequence, and the measuring points are positioned on the ground rightly above the buried metal pipe; electrification potentials and power failure potentials of the different measuring points displayed on the digital multimeter are read; and the position of the breakpoint of the flexible anode is obtained according to the distribution of the power failure potentials among the different measuring points.
Description
Technical field
The present invention relates to transferring oil feed channel technical field, particularly relate to a kind of flexible anode breaking point detection method.
Background technology
Field, China's long-distance oil & gas pipeline station and pipeline network of fuel gas in city close quarters all adopt region cathodic protection system to implement galvanic protection, to slow down or to suppress the etching problem of buried buried metal pipeline outer wall to buried buried metal pipeline.The composition of cathodic protection system is formed primarily of direct supply, anode groundbed, protected pipeline and auxiliary facility four part, and wherein anode groundbed is the core in System's composition loop.But region cathodic protection system is because of object of protection complex structure, and installation region is limited, current demand is large, the design of anode bed and construction by region and safe distance restriction, by the screening effect of ground system, there is larger difference in its effect.
Development and the renewal of region cathode protection technology can be summed up as differentiation and the development of adopted anode form.Domestic nearly 30 years region galvanic protection empirical evidences, field areas of standing cathodic protection system success apply, anode groundbed form and position most important.The appearance of flexible anode then overcomes interference shielding and protective current divides uneven problem.Meanwhile, flexible anode is the supplementary anode of a kind of softness, cable shape, and diameter only has several centimetres.During construction and pipeline laying in one ditch, spacing 20 ~ 30cm, not by the restriction in region.At present, flexible anode has been commonly used in the region cathodic protection system of field, station buried pipeline both at home and abroad.In the U.S., flexible anode is widely used in the protection of oil metallic facility, power plant's underground metalliferous pipe arrangement and the protection of structures, the protection of boats and ships harbour.In European union specification, also suggestion adopts flexible anode to carry out region galvanic protection.At present, the MMO flexible anode that drainage density is large and the life-span is long is applied comparatively extensive in the world.
In rig-site utilization in recent years, flexible anode effect is better, but easily occurs the situation of open circuit, and the anode after breakpoint does not just have electric current, and protected pipeline section corresponding with it just cannot be effectively protected.Because flexible anode earthing effect is better, if breakpoint appears at beyond hundred meters, the grounding resistance by means of only test anode also cannot judge whether it occurs breakpoint, only has the situation being reflected anode whether open circuit by the protection potential of pipeline.Searching for breakpoint, have engineering staff once to have employed RD-PCM pipeline positioning test set to search, find the sensed current signal just decay rapidly after 50 meters loaded by emitter, the current signal on anode is afterwards very weak, cannot detect and obtain.
Summary of the invention
The application provides a kind of flexible anode breaking point detection method, and solving in prior art cannot the technical problem of positioning flexible anode breakpoint.
The application provides a kind of flexible anode breaking point detection method, and for detecting the breakpoint of described cathodic protection system flexible anode, described detection method adopts a proofing unit, and described device comprises: potentiostat; Anode cable, is electrically connected described potentiostat and described flexible anode; Copper sulfate reference electrode; Measuring lead wire; Digital multimeter, the black meter pen of described digital multimeter is electrically connected by described measuring lead wire and described copper sulfate reference electrode; Detective pole, is electrically connected by detective pole build-in test cable and described buried metal pipeline, and the red test pencil of the test cable measurement point of described detective pole and described digital multimeter is electrically connected; Described method comprises: open described potentiostat, makes describedly to realize potentiostat periodically on/off; Described copper sulfate reference electrode is placed in different measurement point successively, the earth's surface that described side amount point is positioned at directly over described buried metal pipeline; Read energising current potential and the switch-off potential of the different side amount point that described digital multimeter shows; The breakpoint location of described flexible anode is obtained according to the switch-off potential distribution between different measurement point.
Preferably, when the number of described potentiostat be multiple and without " power-off test " function time, described proofing unit also comprises the synchronizing current interrupter be arranged on described anode cable.
Preferably, described measurement point is positioned at earth's surface directly over buried buried metal pipeline, and the spacing between adjacent two described measurement point is 1 meter.
Preferably, described measurement point is covered to the terminal location of flexible anode.
Preferably, the described breakpoint location obtaining described flexible anode according to the switch-off potential distribution between different measurement point, specifically comprises:
One potential data-measurement point curve is generated according to the switch-off potential between different sides amount point;
The decay starting point of described switch-off potential is obtained according to described potential data-measurement point curve;
Judge that whether described switch-off potential is from described starting point continuous decrement to the terminal of described flexible anode;
If so, 1 ~ 2 meter, the Liang Dian front, side that then described starting point is corresponding is the breakpoint location of flexible anode.
The technical scheme of the application at least has following beneficial effect:
The flexible anode breaking point detection method that the application provides, open described potentiostat, make describedly to realize potentiostat periodically on/off, described copper sulfate reference electrode is placed in different measurement point successively, read energising current potential and the switch-off potential of the different side amount point that described digital multimeter shows, obtain the breakpoint location of described flexible anode according to the switch-off potential distribution between different measurement point, improving in prior art cannot the technical problem of positioning flexible anode breakpoint.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described by the accompanying drawing used required in describing embodiment below, apparently, the accompanying drawing in the following describes is only some embodiments of the present invention.
Fig. 1 is a kind of flexible anode breaking point detection of the application's better embodiment method flow diagram;
Fig. 2 is the structural representation of the proofing unit that the flexible anode breaking point detection method in Fig. 1 adopts;
Fig. 3 is the one potential data-measurement point graphic representation of the detection of the flexible anode breaking point detection device adopted in Fig. 1.
Wherein 1-potentiostat, 2-anode cable
3-cathode cable, 4-cathodic protection station line
5-long effective reference electrode line, 6-long effective reference electrode
7-flexible anode, 8-buried metal pipeline
9-detective pole, 10-digital multimeter
11-copper sulfate reference electrode, 12-measuring lead wire
13-synchronizing current interrupter, 14-measurement point
15-flexible anode terminal
Embodiment
The embodiment of the present application is by providing a kind of flexible anode breaking point detection method, and solving in prior art cannot the technical problem of positioning flexible anode breakpoint.
Technical scheme in the embodiment of the present application is for solving the problems of the technologies described above, and general thought is as follows:
The flexible anode breaking point detection method that the application provides, open described potentiostat, make describedly to realize potentiostat periodically on/off, described copper sulfate reference electrode is placed in different measurement point successively, read energising current potential and the switch-off potential of the different side amount point that described digital multimeter shows, obtain the breakpoint location of described flexible anode according to the switch-off potential distribution between different measurement point, improving in prior art cannot the technical problem of positioning flexible anode breakpoint.
In order to better understand technique scheme, below in conjunction with Figure of description and concrete embodiment, technique scheme is described in detail.
The application provides a kind of flexible anode breaking point detection method, for detecting the breakpoint of described flexible anode 7.Described detection method adopts a proofing unit.As shown in Figure 2, described device comprises potentiostat 1, anode cable 2, copper sulfate reference electrode 11, digital multimeter 10, detective pole 9.
Described anode cable 2 is electrically connected described potentiostat 1 and described flexible anode 7.Cathode cable 3 is electrically connected described potentiostat 1 and buried metal pipeline 8.Cathodic protection station line 4 is electrically connected described potentiostat 1 and described buried metal pipeline 8.Long effective reference electrode line 5 is electrically connected described potentiostat 1 and long effective reference electrode 6.Described copper sulfate reference electrode 11 is placed in the measurement point directly over pipeline, the earth's surface that described side amount point is positioned at directly over described buried metal pipeline, and described measurement point is covered to the terminal location of flexible anode.In the present embodiment, described copper sulfate reference electrode 11 can be placed in different measurement point 14 places, to carry out potential measurement to multiple measurement point.
Black meter pen and the described copper sulfate reference electrode 11 of described digital multimeter 10 are electrically connected.Described detective pole 9 is electrically connected by detective pole build-in test cable and described buried metal pipeline 8, and the red test pencil of the test cable measurement point of described detective pole 9 and described digital multimeter 10 is electrically connected.Particularly, described detective pole 9 passes through the red test pencil of measuring lead wire 12 connecting test cable measurement point and digital multimeter 10, the black meter pen of digital multimeter 10 is connected with copper sulfate reference electrode 11, along the parallel route of the buried metal pipeline 8 shown in cathodic Protection Design drawing and flexible anode 7 with the energising current potential of 1 meter of spacing test buried metal pipeline 8 and switch-off potential, spacing between two adjacent described measurement point is 1 meter, copper sulfate reference electrode 11 is along layout test potential directly over pipeline of measurement point in Fig. 1 14, and detailed record, test is to flexible anode terminal 15.If flexible anode does not lay the end to pipeline, also should continue to measure the terminal position to pipeline.
When testing at the scene, require energising current potential and the switch-off potential of test buried metal pipeline 8.When potentiostat 1 possesses " power-off test " function, " power-off test " pattern directly can be opened; When potentiostat 1 does not possess " power-off test " function, or when having multiple stage potentiostat 1 power and synchronous break-make can not be realized simultaneously, then need synchronizing current interrupter 13 to be installed on described anode cable to realize the synchronous break-make of multiple stage potentiostat 1.
As shown in Figure 1, said method comprising the steps of:
Step S11, opens described potentiostat, makes describedly to realize potentiostat periodically on/off;
Step S12, is placed in different measurement point successively by described copper sulfate reference electrode, the earth's surface that described side amount point is positioned at directly over described buried metal pipeline;
Step S13, reads energising current potential and the switch-off potential of the different side amount point that described digital multimeter shows;
Step S14, obtains the breakpoint location of described flexible anode according to the switch-off potential distribution between different measurement point.
After having tested, plot analysis is carried out to test data.Particularly, the described breakpoint location obtaining described flexible anode according to the switch-off potential distribution between different measurement point, specifically comprises:
One potential data-measurement point curve is generated according to the switch-off potential between different sides amount point;
The decay starting point of described switch-off potential is obtained according to described potential data-measurement point curve;
Judge that whether described switch-off potential is from described starting point continuous decrement to the terminal of described flexible anode;
If so, 1 ~ 2 meter, the Liang Dian front, side that then described starting point is corresponding is the breakpoint location of flexible anode, if not, then determines the buried metal works that described starting point is densely distributed, the breakpoint location of inflexibility anode.
As Fig. 3, the energising current potential along pipeline test and switch-off potential data are shown in figure, switch-off potential data are comparatively stable, wherein there is the situation of potential decay section 1 and potential decay section 2, occur that the switch-off potential after decay 2 meters recovers normal level again in first time, this section is judged as caused by the earthing material shunting interference of pipeline, so when testing at the scene, require that tester must test the terminal location to anode, in case erroneous judgement.After decay appears in second time in the drawings, current potential no longer returns to normal level, but continuous decrement, now can judge, the scope that potential decay section 2 starting point front is 1 meter ~ 2 meters is breakpoint or the terminal of flexible anode.If drawing shows the terminal location that this place is not anode, then can be judged as the breakpoint of flexible anode.
The flexible anode breaking point detection method that the application provides; according to the practical layout of buried metal pipeline and flexible anode; the breakpoint of flexible anode is judged according to the pipe protection Potential distribution rule under galvanic protection effect; analyze and add density test and obtain pipeline energising current potential and switch-off potential attenuation trend can judge the breakpoint location of flexible anode, solving in prior art cannot the technical problem of positioning flexible anode breakpoint.
The application is when cathodic protection system runs; by opening " power-off test " pattern; directly over Target pipe; energising current potential and the switch-off potential of (generally with 1 meter ~ 2 meters spacing) testing conduit is encrypted by the digital multimeter of high precision high sampling rate; after carrying out data processing again, i.e. the breakpoint of positioning flexible anode.The pipeline switch-off potential tested in this mode is pipeline polarized potential.Because flexible anode and the nearly spacing of pipeline are laid, under accidental conditions, the polarized potential of protected pipeline is evenly distributed, and difference is less.By the polarized potential distribution situation of testing pipes, can judge whether flexible anode exists breakpoint, then by encrypting the polarized potential distribution situation of testing conduit, get final product the breakpoint location of positioning flexible anode.
Flexible anode breaking point detection method disclosed in the present application, in implementation process, first should be appreciated that protected pipeline rout in field, whole station or region, the laying state of the anode in investigation cathodic protection system design paper.If system exists multiple loop, then the anode should specified corresponding to each loop lays route.When cathodic protection system power unit (being generally potentiostat) is normally opened; " power-off test " pattern of opening device; make and break period is adjustable; be generally 12s to lead to; 3s breaks; the pipeline above earth potential read in 100ms to 300ms is after a loss of power switch-off potential, is pipeline polarized potential.If in multiple loop system, multiple stage power unit can not sync break time, now need, on each loop, synchronizing current interrupter is installed respectively.When after the synchronous break-make of power unit; the route can laid according to flexible anode in drawing; by high-precision digital multimeter with the energising current potential of the spacing testing conduit of 1 meter and switch-off potential; test is to the terminal of flexible anode always; again institute's test potential data are carried out plot analysis, at potential decay visibility point, and when follow-up pipeline section current potential cannot return to normal level of protection all the time; then can judge that potential decay visibility point is the breakpoint place of flexible anode, positioning precision can arrive 1 meter.When follow-up pipeline section current potential returns to normal level of protection, be generally that caused by the impact due to intensive earthing material, now potential position can not be judged as the breakpoint location of flexible anode.
The invention has the beneficial effects as follows; can judge whether the flexible anode of cathodic protection system exists open circuit fast, efficiently and accurately; simultaneously by can by the fault point locating of flexible anode in the scope of 1 ~ 2 meter after adding density test; the not normal operation of influential system, for the running maintenance of cathodic protection system and malfunction elimination provide technical support.
Although describe the preferred embodiments of the present invention, those 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 scope of the invention.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. a flexible anode breaking point detection method, for detecting the breakpoint of described cathodic protection system flexible anode, it is characterized in that, described detection method adopts a proofing unit, and described device comprises:
Potentiostat;
Anode cable, is electrically connected described potentiostat and described flexible anode;
Copper sulfate reference electrode;
Measuring lead wire;
Digital multimeter, the black meter pen of described digital multimeter is electrically connected by described measuring lead wire and described copper sulfate reference electrode;
Detective pole, is electrically connected by detective pole build-in test cable and described buried metal pipeline, and the red test pencil of the test cable measurement point of described detective pole and described digital multimeter is electrically connected;
Described method comprises:
Open described potentiostat, make describedly to realize potentiostat periodically on/off;
Described copper sulfate reference electrode is placed in different measurement point successively, the earth's surface that described side amount point is positioned at directly over described buried metal pipeline;
Read energising current potential and the switch-off potential of the different side amount point that described digital multimeter shows;
The breakpoint location of described flexible anode is obtained according to the switch-off potential distribution between different measurement point.
2. detection method as claimed in claim 1, is characterized in that, when the number of described potentiostat be multiple and without " power-off test " function time, described proofing unit also comprises the synchronizing current interrupter be arranged on described anode cable.
3. detection method as claimed in claim 1, it is characterized in that, the spacing between two adjacent described measurement point is 1 meter.
4. detection method as claimed in claim 1, it is characterized in that, described measurement point is covered to the terminal location of flexible anode.
5. detection method as claimed in claim 1, is characterized in that, the described breakpoint location obtaining described flexible anode according to the switch-off potential distribution between different measurement point, specifically comprises:
One potential data-measurement point curve is generated according to the switch-off potential between different sides amount point;
The decay starting point of described switch-off potential is obtained according to described potential data-measurement point curve;
Judge that whether described switch-off potential is from described starting point continuous decrement to the terminal of described flexible anode;
If so, 1 ~ 2 meter, the Liang Dian front, side that then described starting point is corresponding is the breakpoint location of flexible anode.
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| CN106226705A (en) * | 2016-08-29 | 2016-12-14 | 超威电源有限公司 | A kind of lead-acid battery electrode potentiometric detection method |
| CN109085407A (en) * | 2018-04-10 | 2018-12-25 | 青海电研科技有限责任公司 | A kind of measurement method of overhead transmission line to the electromagnetic effect of embedded metal pipeline |
| 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 |
| CN111501049A (en) * | 2020-04-26 | 2020-08-07 | 青岛雅合科技发展有限公司 | Constant potential rectifier on-off test working method |
| CN113373449A (en) * | 2021-06-17 | 2021-09-10 | 西南石油大学 | Buried steel pipeline anticorrosive coating damage point prediction method |
| CN116413197A (en) * | 2023-03-30 | 2023-07-11 | 北京市燃气集团有限责任公司 | Flexible anode breakpoint position testing and determining method and device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106226705A (en) * | 2016-08-29 | 2016-12-14 | 超威电源有限公司 | A kind of lead-acid battery electrode potentiometric detection method |
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| CN109085407A (en) * | 2018-04-10 | 2018-12-25 | 青海电研科技有限责任公司 | A kind of measurement method of overhead transmission line to the electromagnetic effect of embedded metal pipeline |
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| CN111501049A (en) * | 2020-04-26 | 2020-08-07 | 青岛雅合科技发展有限公司 | Constant potential rectifier on-off test working method |
| CN113373449A (en) * | 2021-06-17 | 2021-09-10 | 西南石油大学 | Buried steel pipeline anticorrosive coating damage point prediction method |
| CN113373449B (en) * | 2021-06-17 | 2022-02-08 | 西南石油大学 | Buried steel pipeline anticorrosive coating damage point prediction method |
| CN116413197A (en) * | 2023-03-30 | 2023-07-11 | 北京市燃气集团有限责任公司 | Flexible anode breakpoint position testing and determining method and device |
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Effective date of registration: 20211105 Address after: Room 08-10, 6 / F, block a, No. 5, Dongtucheng Road, Chaoyang District, Beijing 100013 Patentee after: National Petroleum and natural gas pipeline network Group Co.,Ltd. Address before: 100007 Oil Mansion, 9 North Avenue, Dongcheng District, Beijing, Dongzhimen Patentee before: PETROCHINA Co.,Ltd. |