CN104947118B - A kind of flexible anode breaking point detection method - Google Patents
A kind of flexible anode breaking point detection method Download PDFInfo
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- CN104947118B CN104947118B CN201510337177.5A CN201510337177A CN104947118B CN 104947118 B CN104947118 B CN 104947118B CN 201510337177 A CN201510337177 A CN 201510337177A CN 104947118 B CN104947118 B CN 104947118B
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Abstract
The present invention discloses a kind of flexible anode breaking point detection method, and for detecting the breakpoint of the cathodic protection system flexible anode, the detection method uses detection means, and described device includes：Potentiostat；Anode cable, it is electrically connected with the potentiostat and the flexible anode；Copper sulfate reference electrode；Measure lead；Digital multimeter, the black meter pen of the digital multimeter are electrically connected with by the measurement lead with the copper sulfate reference electrode；Test pile, it is electrically connected with by test cable in test pile and the buried metal pipeline；Methods described includes：Open the potentiostat so that described to realize potentiostat periodicity on/off；The copper sulfate reference electrode is sequentially placed into different measurement points, earth's surface of the amount point in side directly over the buried metal pipeline；Read the energization current potential and switch-off potential of the different side amount points shown in the digital multimeter；The breakpoint location of the flexible anode is obtained according to the switch-off potential distribution between different measurement points.
Description
Technical field
The present invention relates to conveying oil-gas pipeline technical field, more particularly to a kind of flexible anode breaking point detection method.
Background technology
China's long-distance oil ＆ gas pipeline yard and pipeline network of fuel gas in city close quarters are all buried using region cathodic protection system
Ground buried metal pipeline implements cathodic protection, to slow down or suppress the etching problem of buried buried metal pipeline outer wall.Negative electrode is protected
The composition of protecting system is mainly formed by dc source, anode ground bed, by protective conduit and the part of auxiliary device four, its Anodic
Bed is the core that system forms loop.However, region cathodic protection system is because protection object structure is complicated, installation region by
Limit, current demand is big, and the design of anode bed and construction are limited by region and safe distance, by the screening effect of earthed system,
Larger difference be present in its application effect.
The development of region cathode protection technology can be attributed to the differentiation and development of used anode form with renewal.It is domestic near
30 years region cathodic protection empirical evidences, the cathodic protection system success application of yard region, anode ground bed form and position
It is most important.The appearance of flexible anode then overcomes the problem of interference shielding and uneven protective current point.Meanwhile flexible anode is
A kind of soft, impressed current anode of cable shape, diameter only have several centimetres.During construction with pipeline laying in one ditch, 20~30cm of spacing, not by
The limitation in region.At present, flexible anode has been commonly used in the region cathodic protection system of domestic and international yard buried pipeline.In U.S.
State, flexible anode are widely used in the protection of oil metallic facility, the protection of power plant's underground metalliferous pipe arrangement and structures, ship code
The protection of head.In European union specification, also it is proposed with flexible anode and carries out region cathodic protection.At present, drainage density is big and the longevity
Long MMO flexible anodes are ordered in the world using relatively broad.
In field application in recent years, flexible anode application effect is preferable, but the situation of open circuit easily occurs, after breakpoint
Anode on just there is no electric current, it is corresponding to be just effectively protected by protection pipeline section.Imitated because flexible anode is grounded
Fruit is preferable, if breakpoint is appeared in beyond hundred meters, only can not also judge whether it occurs by testing the grounding resistance of anode
Breakpoint, only by the protection potential of pipeline come reflect anode whether open circuit situation.Lookup for breakpoint, there is engineering staff
Once employed RD-PCM pipeline locations detection device and carried out lookup, the sensed current signal for finding to load by emitter is 50
Just rapid decay after rice, the current signal on anode afterwards is very weak, can not detect to obtain.
The content of the invention
The application provides a kind of flexible anode breaking point detection method, solve in the prior art can not positioning flexible anode break
The technical problem of point.
The application provides a kind of flexible anode breaking point detection method, for detecting the cathodic protection system flexible anode
Breakpoint, the detection method use a detection means, and described device includes：Potentiostat；Anode cable, it is electrically connected with the perseverance
Potentiometer and the flexible anode；Copper sulfate reference electrode；Measure lead；Digital multimeter, the black table of the digital multimeter
Pen is electrically connected with by the measurement lead with the copper sulfate reference electrode；Test pile, by test cable in test pile with
The buried metal pipeline is electrically connected with, and the red test pencil of the test cable measurement point of the test pile and the digital multimeter
It is electrically connected with；Methods described includes：Open the potentiostat so that described to realize potentiostat periodicity on/off；By described in
Copper sulfate reference electrode is sequentially placed into different measurement points, ground of the side amount point directly over the buried metal pipeline
Table；Read the energization current potential and switch-off potential of the different side amount points shown in the digital multimeter；According to different measurements
Switch-off potential distribution between point obtains the breakpoint location of the flexible anode.
Preferably, when the number of the potentiostat is multiple and without " power failure test " function, the detection means is also
Including the synchronizing current relay being arranged on the anode cable.
Preferably, measurement point position earth's surface directly over buried buried metal pipeline, and adjacent two measurements
Spacing between point is 1 meter.
Preferably, the measurement point is covered to the terminal location of flexible anode.
Preferably, the switch-off potential distribution according between different measurement points obtains the breakpoint bit of the flexible anode
Put, specifically include：
One potential data-measurement point curve is generated according to the switch-off potential between different side amount points；
The decay starting point of the switch-off potential is obtained according to the potential data-measurement point curve；
Judge the switch-off potential whether from the starting point continuous decrement to the terminal of the flexible anode；
If so, then 1~2 meter of side amount point front corresponding to the starting point is the breakpoint location of flexible anode.
The technical scheme of the application at least has the advantages that：
The flexible anode breaking point detection method that the application provides, opens the potentiostat so that described to realize constant potential
Instrument periodicity on/off, the copper sulfate reference electrode is sequentially placed into different measurement points, is read in the digital multimeter
The energization current potential and switch-off potential of the different side amount points of display, are distributed according to the switch-off potential between different measurement points and obtain
The breakpoint location of the flexible anode, improve in the prior art can not positioning flexible anode breakpoint technical problem.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, embodiment will be described below
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment.
Fig. 1 is a kind of flexible anode breaking point detection method flow diagram of the application better embodiment；
Fig. 2 is the structural representation for the detection means that the flexible anode breaking point detection method in Fig. 1 uses；
Fig. 3 is one potential data-measurement point curve map using the detection of the flexible anode breaking point detection device in Fig. 1.
2-anode cable of wherein 1-potentiostat
3-cathode cable, 4-cathodic protection station line
5-long effective reference electrode, 6-long effective reference electrode of line
7-flexible anode, 8-buried metal pipeline
9-test pile, 10-digital multimeter
11-copper sulfate reference electrode 12-measurement lead
13-synchronizing current, 14-measurement point of relay
15-flexible anode terminal
Embodiment
By providing a kind of flexible anode breaking point detection method, solving can not position the embodiment of the present application in the prior art
The technical problem of flexible anode breakpoint.
Technical scheme in the embodiment of the present application is in order to solve the above technical problems, general thought is as follows：
The flexible anode breaking point detection method that the application provides, opens the potentiostat so that described to realize constant potential
Instrument periodicity on/off, the copper sulfate reference electrode is sequentially placed into different measurement points, is read in the digital multimeter
The energization current potential and switch-off potential of the different side amount points of display, are distributed according to the switch-off potential between different measurement points and obtain
The breakpoint location of the flexible anode, improve in the prior art can not positioning flexible anode breakpoint technical problem.
In order to be better understood from above-mentioned technical proposal, below in conjunction with Figure of description and specific embodiment to upper
Technical scheme is stated to be described in detail.
The application provides a kind of flexible anode breaking point detection method, for detecting the breakpoint of the flexible anode 7.The inspection
Survey method uses a detection means.As shown in Figure 2, described device includes potentiostat 1, anode cable 2, copper sulfate reference electrode
11st, digital multimeter 10, test pile 9.
The anode cable 2 is electrically connected with the potentiostat 1 and the flexible anode 7.Cathode cable 3 is electrically connected with institute
State potentiostat 1 and buried metal pipeline 8.Cathodic protection station line 4 is electrically connected with the potentiostat 1 and the buried metal pipeline
8.Long effective reference electrode line 5 is electrically connected with the potentiostat 1 and long effective reference electrode 6.The copper sulfate reference electrode 11 is put
Measurement point directly over pipeline, earth's surface of the side amount point directly over the buried metal pipeline, and the measurement
Point is covered to the terminal location of flexible anode.In the present embodiment, the copper sulfate reference electrode 11 can be placed in different surveys
At amount point 14, to carry out potential measurement to multiple measurement points.
The black meter pen of the digital multimeter 10 is electrically connected with the copper sulfate reference electrode 11.The test pile 9 is logical
Test cable in test pile is crossed to be electrically connected with the buried metal pipeline 8, and the test cable measurement point of the test pile 9 with
The red test pencil of the digital multimeter 10 is electrically connected with.Specifically, the test pile 9 is by measuring the connecting test cable of lead 12
The red test pencil of measurement point and digital multimeter 10, the black meter pen of digital multimeter 10 is connected with copper sulfate reference electrode 11, along the moon
The parallel route of buried metal pipeline 8 and flexible anode 7 shown in the design protection drawing of pole tests buried metal with 1 meter of spacing
The energization current potential and switch-off potential of pipeline 8, the spacing between adjacent two measurement points are 1 meter, copper sulfate reference electrode
11 along Fig. 1 measurement point 14 layout directly over pipeline test potential, and record in detail, flexible anode terminal 15 is arrived in test.
If flexible anode should also continue measurement to the terminal position of pipeline without laying to the end of pipeline.
When testing at the scene, it is desirable to test the energization current potential and switch-off potential of buried metal pipeline 8.When potentiostat 1 has
During standby " power failure test " function, " power failure test " pattern can be directly opened；When potentiostat 1 does not possess " power failure test " function,
Or when there are more potentiostats 1 while powering and synchronous break-make can not be realized, then need to install synchronously on the anode cable
Current interrupter 13 realizes the synchronous break-make of more potentiostats 1.
As shown in figure 1, it the described method comprises the following steps：
Step S11, open the potentiostat so that described to realize potentiostat periodicity on/off；
Step S12, the copper sulfate reference electrode is sequentially placed into different measurement points, the side amount point is positioned at described
Earth's surface directly over buried metal pipeline；
Step S13, read the energization current potential and switch-off potential of the different side amount points shown in the digital multimeter；
Step S14, the breakpoint location of the flexible anode is obtained according to the switch-off potential distribution between different measurement points.
After the completion of test, plot analysis is carried out to test data.Specifically, it is described according to disconnected between different measurement points
Electric potential distribution obtains the breakpoint location of the flexible anode, specifically includes：
One potential data-measurement point curve is generated according to the switch-off potential between different side amount points；
The decay starting point of the switch-off potential is obtained according to the potential data-measurement point curve；
Judge the switch-off potential whether from the starting point continuous decrement to the terminal of the flexible anode；
If so, then 1~2 meter of side amount point front is the breakpoint location of flexible anode corresponding to the starting point, if it is not, then true
The densely distributed buried metal works of the fixed starting point, the breakpoint location of non-flexible anode.
Such as Fig. 3, energization current potential and switch-off potential data of the display along pipeline test in figure, switch-off potential data are comparatively
It is stable, wherein there is the situation of potential decay section 1 and potential decay section 2, the power-off electric after there is 2 meters of decay in first time
Normal level is recovered in position again, and this section is judged as caused by the earthing material shunting interference of pipeline, so when testing at the scene,
Tester is asked to test to the terminal location of anode, to prevent erroneous judgement.In figure after second of appearance decay, current potential is no longer extensive
Answer to normal level, but continuous decrement, now it can determine whether, 1 meter~2 meters of scope is soft in front of the starting point of potential decay section 2
The breakpoint or terminal of property anode.If drawing show at this be not anode terminal location, can determine whether as the disconnected of flexible anode
Point.
The flexible anode breaking point detection method that the application provides, according to buried metal pipeline and the actual cloth of flexible anode
Office, the pipe protection Potential distribution rule under being acted on according to cathodic protection are analyzed to encrypt and tested to judge the breakpoint of flexible anode
Obtain pipeline energization current potential and switch-off potential attenuation trend can determine whether the breakpoint location of flexible anode, solve in the prior art
Can not positioning flexible anode breakpoint technical problem.
The application is when cathodic protection system is run, by opening " power failure test " pattern, in the surface of Target pipe,
Energization current potential and the power-off that pipeline is tested (typically with 1 meter~2 meters spacing) are encrypted with the digital multimeter of high-precision high sampling rate
Current potential, then after carrying out data processing, the i.e. breakpoint of positioning flexible anode.The pipeline switch-off potential tested in this mode is to manage
Road polarization potential.Because flexible anode and the nearly spacing of pipeline are laid, under accidental conditions, by the polarization potential of protective conduit
It is evenly distributed, difference is smaller.By the polarization potential distribution situation for detecting pipeline, it can be determined that flexible anode is with the presence or absence of disconnected
Point, then by encrypting the polarization potential distribution situation of test pipeline, you can the breakpoint location of positioning flexible anode.
Flexible anode breaking point detection method disclosed in the present application should be appreciated that whole yard or area first in implementation process
Moved towards in domain by protective conduit, investigate the laying state of the anode in cathodic protection system design drawing.If system exists more
Individual loop, then it should be understood that the anode laying corresponding to each loop is route.In cathodic protection system power-supply device (generally constant potential
Instrument) it is normally-open when, open " power failure test " pattern of equipment, make and break period is adjustable, and generally 12s leads to, and 3s breaks, after a loss of power
The pipeline above earth potential read in 100ms to 300ms is switch-off potential, as pipeline polarization potential.If in multiloop system,
When more power-supply devices are unable to sync break, now need that synchronizing current relay is installed respectively on each loop.When power supply is set
After standby synchronous break-make, it can be surveyed according to the route of flexible anode laying in drawing with high-precision digital multimeter with 1 meter of spacing
The terminal of the energization current potential and switch-off potential in test tube road, always test to flexible anode, then institute's test potential data are painted
Map analysis, in potential decay visibility point, and when follow-up pipeline section current potential can not be recovered to normal level of protection all the time, then it can sentence
Power down bit decay visibility point is where the breakpoint of flexible anode, positioning precision is reachable 1 meter.When follow-up pipeline section current potential recovers
During to normal level of protection, it is typically due to caused by the influence of intensive earthing material, now potential position can not be judged as flexibility
The breakpoint location of anode.
The invention has the advantages that can quickly, efficiently and accurately judge whether the flexible anode of cathodic protection system is deposited
In open circuit, while by the way that after encrypting test system can not be influenceed by the fault point locating of flexible anode in the range of 1~2 meter
Normal operation, technical support is provided for the operation maintenance and malfunction elimination of cathodic protection system.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (4)
- A kind of 1. flexible anode breaking point detection method, for detecting the breakpoint of cathodic protection system flexible anode, it is characterised in that The detection method uses a detection means, and described device includes：Potentiostat；Anode cable, it is electrically connected with the potentiostat and the flexible anode；Copper sulfate reference electrode；Measure lead；Digital multimeter, the black meter pen of the digital multimeter are electrical by the measurement lead and the copper sulfate reference electrode Connection；Test pile, it is electrically connected with by test cable in test pile and buried metal pipeline, and the test cable of the test pile The red test pencil of measurement point and the digital multimeter is electrically connected with；Methods described includes：Open the potentiostat so that the potentiostat periodicity on/off；The copper sulfate reference electrode is sequentially placed into different measurement points, the measurement point position is in the buried metal pipeline The earth's surface of surface；Read the energization current potential and switch-off potential of the different measurement points shown in the digital multimeter；The breakpoint location of the flexible anode is obtained according to the switch-off potential distribution between different measurement points；The switch-off potential distribution according between different measurement points obtains the breakpoint location of the flexible anode, specific bag Include：One potential data-measurement point curve is generated according to the switch-off potential between different measurement points；The decay starting point of the switch-off potential is obtained according to the potential data-measurement point curve；Judge the switch-off potential whether from the starting point continuous decrement to the terminal of the flexible anode；If so, then 1 ~ 2 meter of measurement point front corresponding to the starting point is the breakpoint location of flexible anode.
- 2. detection method as claimed in claim 1, it is characterised in that when the number of the potentiostat is " disconnected for multiple and nothing During electrical testing " function, the detection means also includes the synchronizing current relay being arranged on the anode cable.
- 3. detection method as claimed in claim 1, it is characterised in that the spacing between two adjacent measurement points is 1 Rice.
- 4. detection method as claimed in claim 1, it is characterised in that the measurement point is covered to the terminal position of flexible anode Put.
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| CN106226705B (en) * | 2016-08-29 | 2019-09-20 | 超威电源有限公司 | A kind of lead-acid battery electrode potentiometric detection method |
| CN109085407B (en) * | 2018-04-10 | 2021-06-01 | 青海电研科技有限责任公司 | Method for measuring electromagnetic influence of overhead transmission line on buried 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 |
| 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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