CN106641741A - Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline - Google Patents
Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline Download PDFInfo
- Publication number
- CN106641741A CN106641741A CN201611197391.6A CN201611197391A CN106641741A CN 106641741 A CN106641741 A CN 106641741A CN 201611197391 A CN201611197391 A CN 201611197391A CN 106641741 A CN106641741 A CN 106641741A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- unit
- signal
- breaking point
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The invention relates to a device and method for detecting a damaged point of an outer wall corrosion-resistant layer of an extra-buried deep pipeline. The device comprises an emitter, two probe poles and a detecting instrument. The emitter is electrically connected to the pipeline; each probe pole is provided with a hollow body in a rectangular shape, one ends of the body are provided with probe needles, the other ends of the body are provided with grip handles, connectors are arranged on the grip handles, and the probe needles are electrically connected to the connectors through wires arranged in the body; the detecting instrument comprises a power source unit, an input protection unit, a gain adjustment unit, an amplifying processing unit, a denoising filtering unit, a single chip processing unit and a display unit; the input ends of the input protection unit are electrically connected to the connectors of the probe poles, and the output ends of the input protection unit, the gain adjustment unit, the amplifying processing unit, the denoising filtering unit, the single chip processing unit and the display unit are electrically connected in sequence. According to the device and method for detecting the damaged point of the outer wall corrosion-resistant layer of the extra-buried deep pipeline, the position of the damaged point can be fast and accurately determined.
Description
Technical field
The invention belongs to underground piping Detection Techniques field, and in particular to a kind of outer wall for detecting super buried depth pipeline is prevented
The apparatus and method of the breaking point of rotten layer.
Background technology
With China's oil chemical industry develop rapidly and urban public utilities construction speed raising, underground metal pipes
Build also in development at full speed.But meanwhile, underground metal pipes are also often subject to the corrosion of various harmful substances, the corrosion of pipeline
Give people class and social environment brings the problem that huge economic loss and social safety are brought to become increasingly conspicuous.Therefore, for conveying
Respectively it is required to be protected with the steel pipe of medium, it is to avoid various corrosion factors in soil, compound ions, bacterium, be conducive to electricity
The corrosion of the various conditions or stray electrical current that road passes through pipeline etc..In actual applications, the additional anticorrosive coat protection of steel pipe
It is most common method.Protective conduit outer wall exempts from the electrochemical corrosion of soil media, the purpose of bacterial corrosion.Buried pipeline is prevented
Rotten layer causes deterioration due to factors, aging, embrittlement occurs, peels off, comes off, ultimately resulting in Metal pipeline corrosion perforation, draws
Play leakage.Anticorrosive coat deterioration similarly affects cathodic protection efficiency, because after anticorrosive coat deterioration, metallic conduit is without cease with the earth
Edge, protective current scatters and disappears, and guard space will shorten, and the pipeline that causing to protect is corroded.Therefore, it is anti-to underground piping
Rotten layer status periodical evaluation, and it is planned carry out leak detection and mending-leakage be prevent and avoid because anticorrosive coat deteriorate and causes pipeline corruption
The important means of erosion, is exactly both at home and abroad human body using more method in conventional buried depth pipeline anticorrosion coating detection field in recent years
The method such as capacitance method, ACVG, DCVG, achieves preferable effect.But with developing rapidly for no-dig technique Directional Drilling Technology, mesh
The underground utilities of front employing Directional Drilling construction are more and more, and buried depth is also increasingly deeper, river crossing, the pipeline of highway
Now with buried depth met or exceeded 30 meters, so deep pipeline external anti-corrosion layer detection above method Detection results are not
It is preferable.
In super buried depth pipeline anticorrosion coating detection field, existing anticorrosive coat breaking point detection is using between two rapiers of detection
Potential differentiation, that is, anticorrosive coat breaking point is recognized by the size of signal strength signal intensity.If increasing by two visits anode-cathode distance, current potential
Difference can increase, but be susceptible to the impact of ground surface environment factor, increase by two rapiers and increased apart from rear potential difference, but if
The presence of the environmental condition such as medium difference in two test point surface soil humidity differences, soil, signal not necessarily just has greatly
Anticorrosive coat breaking point, it is also possible to what environmental condition caused, easily causes the erroneous judgement of anticorrosive coat breaking point.
Accordingly, it would be desirable to a kind of more accurate convenient method and apparatus of the outer wall anticorrosive coat breaking point of detection underground piping.
The content of the invention
It is an object of the present invention to provide a kind of device of the breaking point of the outer wall anticorrosive coat for detecting super buried depth pipeline.
It is a further object to provide a kind of method of the breaking point of the outer wall anticorrosive coat for detecting super buried depth pipeline.
In one aspect, the device of the breaking point of the outer wall anticorrosive coat of the super buried depth pipeline of detection that the present invention is provided includes sending out
Emitter, it is electrically connected to the underground piping；Two rapiers, each rapier has elongated, hollow main body, the main body
One end there is probe and the other end has lever, connector is provided with the lever, the probe is described by being arranged on
Wire in main body is electrically connected with the connector；Detector, including power subsystem, input protection location, gain adjustment unit,
Magnification processing, noise reduction filtering unit, single-chip microcomputer processing unit and display unit；It is wherein described to be input into the defeated of protection location
Enter end to electrically connect with the connector of the rapier, output end, the gain adjustment unit, the institute of the input protection location
State magnification processing, the noise reduction filtering unit, the single-chip microcomputer processing unit, the display unit to be sequentially connected electrically.
In the present invention, term " super buried depth pipeline " is often referred to be imbedded in the pipeline and pipeline of subsurface 10-40 rice or so
Outer wall is coated with anticorrosive coat.
In the present invention, transmitter is used to apply one group of high-frequency simultaneously to pipe under test and two groups low in frequency multiplication relation
The hybrid frequency AC signal of frequency, can adopt various transmitters commonly used in the art.
In the present invention, high-frequency is often referred to the frequency not less than 128Hz, such as 128Hz, 512Hz, 1024Hz, applies
One group of high-frequency be generally used for determining stationary singnal determining suitable detection interval etc..
In the present invention, low frequency of two groups of applying in frequency multiplication relation is used to determine electric current based on phase-comparison circuit
Direction.In the present invention, usual high-frequency is low-frequency 10-300 times.In the present invention, exemplary two groups close in frequency multiplication
The low frequency of system can be 4Hz+8Hz, 3Hz+6Hz, 5Hz+10Hz etc..
The high-frequency of applying and low-frequency size can be selected according to field condition.
Selectively, the frequency signal of applying can be the waveform signals such as sine wave, square wave, sawtooth waveforms.
The frequency size of applying is little with testing result relation, simply different live geographical environments, the difficulty that signal applies
Easily degree is different, and signal transmission distance is also different.
In the present invention, the potential difference that detector is used between two probes of detection, is represented by dB values.
Stationary singnal is often referred to potential difference less than 50mV.
Alternatively, probe is needle-like.
Alternatively, probe is metal probe.
Alternatively, the other end of main body has screw thread, so as to be threadedly coupled with the lever.Alternatively, main body with
Probe becomes one.
Alternatively, power subsystem provides electric power for other each units in the device of the present invention；Input protection location is used for
Current signal to being collected carries out voltage-limiting protection；The gain adjustment unit is used to enter the current signal after voltage-limiting protection
Row gain-adjusted；The magnification processing is used to be amplified process to the current signal after gain-adjusted；The noise reduction filter
Ripple unit is used to carry out noise reduction and filtering process to the signal after amplification.
Alternatively, single-chip microcomputer processing unit is based on phase-comparison circuit.
Alternatively, display unit includes sense of current direction display unit and signal magnitude display unit.Alternatively, two
Unit is liquid crystal display or light emitting diode.
Alternatively, the unit of display is individual unit, while the sense of current and signal magnitude can be shown.
On the other hand, the use said apparatus that the present invention is provided detect the breaking point of the outer wall anticorrosive coat of super buried depth pipeline
Method comprise the steps：
Step a：Apply three groups of signals simultaneously to the pipeline, one group is high-frequency signal, and another two groups is in frequency multiplication relation
Low frequency signal；
Step b：Two rapiers are connected into the detector and are inserted into the soil of the top of the pipeline, measure edge
Potential difference between two rapiers of the longitudinal direction for the pipeline；
Step c：Adjust the distance between two rapiers to determine stationary singnal based on the high-frequency signal for applying, setting reaches
The distance between two rapiers during stationary singnal are detection interval；
Step d：By two groups of low frequency signals in frequency multiplication relation are amplified, after filtering, wherein more low-frequency signal is entered
Row frequency multiplication is amplified and obtains two frequency identical signals, is input in phase-comparison circuit the phase place that recognizes respective signal and is carried out
Relatively, if two signal phases are identical, show the sense of current forward；If 180 ° of the phase of two signals, table
The bright sense of current is backward；
Step e：Based on the sense of current and the potential difference that detect, with the detection interval as step pitch along
The longitudinal direction of the pipeline moves two probes, until detecting the breaking point.
Alternatively, in step d, when the sense of current forward when show the breaking point in the detection interval
Front；When the sense of current backward when show the breaking point at the rear of the detection interval.
Alternatively, in step e, when there is no the breaking point in the detection interval, the potential difference
Remain essentially in the stationary singnal；Show the detection interval Jie Jin the breakage when the potential difference increases
Point；When being reduced to close zero again after potential difference increase, then the centre position of the detection interval is the breaking point.
The work of the device of the present invention and use principle are summarized as follows：
Single-chip microcomputer processing unit be based on phase-comparison circuit, i.e., transmitter apply two groups in frequency multiplication relation (such as 4Hz and
8Hz；3Hz and 6Hz) frequency signal；Two groups of signals are amplified, after filtering, wherein more low-frequency signal (such as 4Hz) is carried out
Frequency multiplication amplifies the signal for obtaining two frequencies identical (being such as 8Hz), is input to the phase that phase-comparison circuit recognizes respective signal
Position is simultaneously compared, if two signal phases are identical, display is indicated forward；If the phase of two signals
180 °, then display is indicated backward.
When using, transmitter applies the AC signal of one group of high-frequency and two groups of low-frequency hybrid frequencies, two rapiers
It is inserted into soil and gathers signal, signal Jing gain-adjusted, after amplifying, enters after being input into protection location and carrying out voltage-limiting protection
Row noise reduction and filtering process, after single-chip microcomputer processing unit processes, the level intensity and the sense of current of signal, i.e. potential difference
Shown with arrow and dB values in the display with the direction of anticorrosive coat breaking point.
" forward direction " arrow this show anticorrosive coat breaking point in the front of detection interval；" backward " arrow shows that anticorrosive coat is damaged
Put at the rear of detection interval, it is possible thereby to determine the direction of anticorrosive coat breaking point.
Level intensity reflects how far of the detection interval apart from anticorrosive coat breaking point, and detection interval is broken apart from anticorrosive coat
Damage point is nearer, and level intensity is higher, conversely, detection interval is more remote apart from anticorrosive coat breaking point, level intensity is lower.In anticorrosive coat
Breaking point both sides, sense of current contrast, therefore being accurately positioned for anticorrosive coat breaking point can be realized.
Compared with the prior art, it is of the invention that anticorrosive coat breaking point is recognized based on the sense of current between two rapiers
Advantage is：
1st, the device for being used and method of operating are simple, strong antijamming capability, sensitivity and high precision, hardly by earth's surface
The impact of the humidity of environment and soil.
2nd, the position of anticorrosive coat breaking point is quickly and accurately determined.
3rd, the measuring method for being used and device, except the detection for being effectively applicable to super buried depth pipeline anticorrosion coating breaking point,
Suitable for conventional buried depth pipeline, the scope of application is wider.
Description of the drawings
With reference to the accompanying drawings and examples the present invention will be further described.
Fig. 1 is the test schematic diagram of the present invention；
Fig. 2 is the rapier structural representation of apparatus of the present invention；
Fig. 3 is the electric functional-block diagram of detector of the present invention.
In Fig. 1-3,1 is Target pipe, 2 is anticorrosive coat breaking point, 3 is rapier, 4 is connection cable, 5 is detector；3-1
For probe, 3-2 be main body, 3-3 be wire, 3-4 be lever, 3-5 be connector；5-1 is power subsystem, 5-2 input protection lists
Unit, 5-3 gain adjustment units, 5-4 magnification processings, 5-5 noise reduction filtering units, 5-6 single-chip microcomputer processing units, 5-7 electric currents
Direction direction display unit, 5-8 is signal magnitude display unit.
Specific embodiment
To make purpose, technical scheme and the advantage of the application clearer, below in conjunction with the application specific embodiment and
Corresponding accompanying drawing is clearly and completely described to technical scheme.Obviously, described embodiment is only the application one
Section Example, rather than the embodiment of whole.Based on the embodiment in the application, those skilled in the art are not making wound
The every other embodiment obtained under the premise of the property made work, belongs to the scope of the application protection.
Below with reference to the accompanying drawings 1-3 detects pipeline outer wall corrosion failure point to be illustratively described using device of the invention
Method.
First with the cable line terminals drawn from pipeline body on the test pile of buried pipeline, connect transmitter, to target
Pipeline applies two groups of ac signals of one group of high-frequency (such as 512Hz) and two groups of low frequencies (such as 4Hz+8Hz) simultaneously.
Two rapiers are used alone, and keep at a certain distance away along duct orientation in the soil being inserted into above pipeline and are connected to
Detector.Using the high-frequency signal for applying, the spacing for adjusting two rapiers confirms stationary singnal size.When stationary singnal is stablized
Afterwards, longitudinally detect along pipeline by step pitch of distance now between two rapiers.
The sine wave signal of the low frequency (4Hz+8Hz) of applying is amplified, after filtering, will more low-frequency signal (such as
4Hz) carry out frequency multiplication and amplify the signal for obtaining two frequencies identical (being such as 8Hz), be input to phase-comparison circuit identification respective
The phase place of signal is simultaneously compared, if two sine wave signal phase places are identical, the electric current in display unit in display pipes
Forward, to be indicated by means of an arrow；If 180 ° of the phase of two sine wave signals, the electricity in display unit in display pipes
Flow backward, to be indicated by means of an arrow.The potential difference between two rapiers is also shown in the display unit of detector, unit is dB.
When arrow is longitudinally directed to front along pipeline, anticorrosive coat breaking point is illustrated in the front of detection interval, when arrow edge
When pipeline is longitudinally directed to rear, illustrate anticorrosive coat breaking point at the rear of detection interval.
There is no the position of breaking point in pipeline anticorrosion coating, the potential difference between two rapiers is kept substantially stationary singnal big
It is little constant, when the potential difference between two rapiers for detecting increases, illustrate that detection interval and the distance of anticorrosive coat breaking point exist
Reduce, i.e. detection interval close anticorrosive coat breaking point.
When being reduced to close zero again after the potential difference increase of two interpolars for detecting, detection interval and anticorrosive coat are illustrated
Breaking point overlaps, i.e. the intermediate point of detection interval is exactly the position of anticorrosive coat breaking point.
Continue to detect forward from potential difference smallest point, potential difference becomes and fall back to again after one segment distance of big detection close quiet
State signal.When detecting anticorrosive coat breaking point again, the potential difference between two rapiers increases again.
Embodiments herein is the foregoing is only, the application is not limited to.For those skilled in the art
For, the application can have various modifications and variations.All any modification, equivalents made within spirit herein and principle
Replace, improve etc., within the scope of should be included in claims hereof.
Claims (5)
1. the device of the breaking point of the outer wall anticorrosive coat of the super buried depth pipeline of a kind of detection, it is characterised in that include：
Transmitter, it is electrically connected to the pipeline；
Two rapiers, one end that each rapier has elongated, hollow main body, the main body has probe and other end tool
There is lever, connector is provided with the lever, the probe is by being arranged on the wire in the main body with the connector
Electrical connection；
Detector, including power subsystem, input protection location, gain adjustment unit, magnification processing, noise reduction filtering unit,
Single-chip microcomputer processing unit and display unit；
The input of wherein described input protection location is electrically connected with the connector of the rapier, the input protection location
Output end, the gain adjustment unit, the magnification processing, the noise reduction filtering unit, single-chip microcomputer process it is single
First, described display unit is sequentially connected electrically；
Wherein described single-chip microcomputer processing unit is based on phase-comparison circuit；
Wherein described display unit shows the sense of current and signal magnitude simultaneously.
2. device as claimed in claim 1, it is characterised in that the probe is needle-like.
3. a kind of method of the breaking point of the outer wall anticorrosive coat that super buried depth pipeline is detected using device as claimed in claim 1,
Comprise the steps：
Step a：Apply three groups of signals simultaneously to the pipeline, one group is high-frequency signal, and another two groups is the low frequency in frequency multiplication relation
Signal；
Step b：Two rapiers are connected into the detector and are inserted into the soil of the top of the pipeline, measured along institute
Potential difference between two rapiers of the longitudinal direction for stating pipeline；
Step c：Adjust the distance between two rapiers based on the high-frequency signal for applying to determine stationary singnal, setting reaches static state
The distance between two rapiers during signal are detection interval；
Step d：By two groups of low frequency signals in frequency multiplication relation are amplified, after filtering, wherein more low-frequency signal is carried out times
Frequency amplifies and obtains two frequency identical signals, is input in phase-comparison circuit the phase place that recognizes respective signal and is compared
Compared with if two signal phases are identical, showing the sense of current forward；If 180 ° of the phase of two signals, shows
The sense of current is backward；
Step e：It is step pitch along described with the detection interval based on the sense of current and the potential difference that detect
The longitudinal direction of pipeline moves two probes, until detecting the breaking point.
4. method as claimed in claim 3, wherein in step d, when the sense of current forward when show described broken
Point is damaged in the front of the detection interval；When the sense of current backward when show the breaking point after the detection interval
Side.
5. method as claimed in claim 3, wherein in step e, when there is no the breakage in the detection interval
During point, the potential difference remains essentially in the stationary singnal；Show the detection zone when the potential difference increases
Between Jie Jin the breaking point；When being reduced to close zero again after potential difference increase, then the centre of the detection interval
Position is the breaking point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197391.6A CN106641741B (en) | 2016-12-22 | 2016-12-22 | A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611197391.6A CN106641741B (en) | 2016-12-22 | 2016-12-22 | A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106641741A true CN106641741A (en) | 2017-05-10 |
| CN106641741B CN106641741B (en) | 2018-12-07 |
Family
ID=58834115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611197391.6A Active CN106641741B (en) | 2016-12-22 | 2016-12-22 | A kind of device and method of the breaking point of the outer wall erosion resistant coating of the super buried depth pipeline of detection |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106641741B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663408A (en) * | 2018-05-18 | 2018-10-16 | 中国石油天然气集团公司 | A kind of steel oil-gas pipeline Directional Drilling erosion resistant coating breakage rate determines method |
| CN109142454A (en) * | 2018-09-27 | 2019-01-04 | 中国科学院合肥物质科学研究院 | A kind of pipeline leak detection method continuously detected based on canal electrical resistance |
| CN109488889A (en) * | 2018-11-09 | 2019-03-19 | 上海金艺检测技术有限公司 | The online test method of in-service metallic conduit insulated liner layer status |
| CN109654379A (en) * | 2019-01-18 | 2019-04-19 | 陕西泰诺特检测技术有限公司 | A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method |
| CN112287589A (en) * | 2020-11-10 | 2021-01-29 | 厦门华润燃气有限公司 | Finite element positioning method for buried steel pipeline anticorrosive coating damage point |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279751A (en) * | 1993-06-23 | 1995-01-11 | Babcock & Wilcox Co | Eddy current detection of defects on metal components |
| CN1479092A (en) * | 2003-07-08 | 2004-03-03 | 崧 刘 | Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state |
| CN201673231U (en) * | 2010-05-13 | 2010-12-15 | 西安华傲通讯技术有限责任公司 | Fault testing apparatus of cable or pipeline |
| CN102252168A (en) * | 2011-07-19 | 2011-11-23 | 华电能源股份有限公司 | Accurate positioning and detecting method and device for damages of underground metal pipeline anticorrosive coating |
| 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 |
| CN202141690U (en) * | 2011-07-19 | 2012-02-08 | 华电能源股份有限公司 | Accurate positioning detector for buried metal pipeline anticorrosive coating damaged points |
| CN102797979A (en) * | 2012-08-29 | 2012-11-28 | 上海海事大学 | Device for detecting leakage points of underground pipeline and method thereof |
| CN102879462A (en) * | 2012-10-27 | 2013-01-16 | 浙江大学 | Metal defect eddy current detection device and probe thereof |
| CN103063738A (en) * | 2012-12-19 | 2013-04-24 | 上海市特种设备监督检验技术研究院 | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline |
| CN103364442A (en) * | 2012-03-30 | 2013-10-23 | 保定驰骋千里科技有限公司 | Method for evaluating damage severity degree of external anticorrosive coating of pipeline |
| CN103727398A (en) * | 2013-11-08 | 2014-04-16 | 安徽省特种设备检测院 | Non-excavation detection method for outer anti-corrosion layer of buried steel pipeline |
| CN204595232U (en) * | 2015-05-28 | 2015-08-26 | 江苏晟利探测仪器有限公司 | A kind of rapier detecting super buried pipeline |
| CN105114821A (en) * | 2015-10-19 | 2015-12-02 | 叶雷 | Detection method for leakage of buried metal pipeline |
| CN205670135U (en) * | 2016-06-20 | 2016-11-02 | 聂旭阳 | A kind of buried pipeline deficiency of protection coating detecting system |
| CN206338592U (en) * | 2016-12-22 | 2017-07-18 | 江苏晟尔检测仪器有限公司 | A kind of device for being used to detect the outer wall anticorrosive coat breaking point of super buried depth underground piping |
-
2016
- 2016-12-22 CN CN201611197391.6A patent/CN106641741B/en active Active
Patent Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2279751A (en) * | 1993-06-23 | 1995-01-11 | Babcock & Wilcox Co | Eddy current detection of defects on metal components |
| CN1479092A (en) * | 2003-07-08 | 2004-03-03 | 崧 刘 | Gronnd surface electric measuing method for detecting underground metal pipeline corrusion state |
| CN201673231U (en) * | 2010-05-13 | 2010-12-15 | 西安华傲通讯技术有限责任公司 | Fault testing apparatus of cable or pipeline |
| CN102252168A (en) * | 2011-07-19 | 2011-11-23 | 华电能源股份有限公司 | Accurate positioning and detecting method and device for damages of underground metal pipeline anticorrosive coating |
| 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 |
| CN202141690U (en) * | 2011-07-19 | 2012-02-08 | 华电能源股份有限公司 | Accurate positioning detector for buried metal pipeline anticorrosive coating damaged points |
| CN103364442A (en) * | 2012-03-30 | 2013-10-23 | 保定驰骋千里科技有限公司 | Method for evaluating damage severity degree of external anticorrosive coating of pipeline |
| CN102797979A (en) * | 2012-08-29 | 2012-11-28 | 上海海事大学 | Device for detecting leakage points of underground pipeline and method thereof |
| CN102879462A (en) * | 2012-10-27 | 2013-01-16 | 浙江大学 | Metal defect eddy current detection device and probe thereof |
| CN103063738A (en) * | 2012-12-19 | 2013-04-24 | 上海市特种设备监督检验技术研究院 | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline |
| CN103727398A (en) * | 2013-11-08 | 2014-04-16 | 安徽省特种设备检测院 | Non-excavation detection method for outer anti-corrosion layer of buried steel pipeline |
| CN204595232U (en) * | 2015-05-28 | 2015-08-26 | 江苏晟利探测仪器有限公司 | A kind of rapier detecting super buried pipeline |
| CN105114821A (en) * | 2015-10-19 | 2015-12-02 | 叶雷 | Detection method for leakage of buried metal pipeline |
| CN205670135U (en) * | 2016-06-20 | 2016-11-02 | 聂旭阳 | A kind of buried pipeline deficiency of protection coating detecting system |
| CN206338592U (en) * | 2016-12-22 | 2017-07-18 | 江苏晟尔检测仪器有限公司 | A kind of device for being used to detect the outer wall anticorrosive coat breaking point of super buried depth underground piping |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108663408A (en) * | 2018-05-18 | 2018-10-16 | 中国石油天然气集团公司 | A kind of steel oil-gas pipeline Directional Drilling erosion resistant coating breakage rate determines method |
| CN109142454A (en) * | 2018-09-27 | 2019-01-04 | 中国科学院合肥物质科学研究院 | A kind of pipeline leak detection method continuously detected based on canal electrical resistance |
| CN109488889A (en) * | 2018-11-09 | 2019-03-19 | 上海金艺检测技术有限公司 | The online test method of in-service metallic conduit insulated liner layer status |
| CN109654379A (en) * | 2019-01-18 | 2019-04-19 | 陕西泰诺特检测技术有限公司 | A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method |
| CN112287589A (en) * | 2020-11-10 | 2021-01-29 | 厦门华润燃气有限公司 | Finite element positioning method for buried steel pipeline anticorrosive coating damage point |
| CN112287589B (en) * | 2020-11-10 | 2022-08-16 | 厦门华润燃气有限公司 | Finite element positioning method for buried steel pipeline anticorrosive coating damage point |
| CN113983361A (en) * | 2021-09-15 | 2022-01-28 | 北京市燃气集团有限责任公司 | 3PE anticorrosive coating peeling and shielding risk judging method and device based on test piece |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106641741B (en) | 2018-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106641741A (en) | Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline | |
| CN102252168B (en) | Accurate positioning and detecting method and device for damages of underground metal pipeline anticorrosive coating | |
| CN106324687B (en) | A kind of buried irony pipeline detection and accurate positioning method | |
| CN101358827B (en) | TEM detecting method for pipe wall thickness and intelligent detector for GBH pipe corrosion | |
| CN108152597B (en) | Grounding electrode corrosion state diagnosis device and method based on relative grounding resistance | |
| CN205720093U (en) | Metal pipeline corrosion data acquisition unit | |
| CN202141690U (en) | Accurate positioning detector for buried metal pipeline anticorrosive coating damaged points | |
| CN104233314A (en) | Dynamic interference potential test system for buried pipeline | |
| CN101782621A (en) | Method and device for judging fault point locations in cable protective layer fault detection | |
| CN104947118B (en) | A kind of flexible anode breaking point detection method | |
| CN103196991B (en) | The all standing transient electromagnetic detection method of the metal erosion of continuous diagnosis body and defect | |
| CN206338592U (en) | A kind of device for being used to detect the outer wall anticorrosive coat breaking point of super buried depth underground piping | |
| CN107346037B (en) | Three-dimensional underground piping accurately detecting method | |
| CN101865817B (en) | Sensor and detection method for detecting corrosion of buried metal | |
| CN103941095B (en) | A kind of method that the resistivity of underground metallic conduit surrounding soil is tested | |
| CN103697332A (en) | Device and method for online leakage detection of buried water conveying pipeline | |
| CN103727398B (en) | Buried steel pipe external anti-corrosion layer Indirect testing method | |
| CN108572396A (en) | A kind of underground gas pipeline detection method | |
| Liu et al. | A magnetic detecting and evaluation method of substation’s grounding grids with break and corrosion | |
| CN210376520U (en) | Multi-frequency scanning tower grounding resistance measuring device | |
| CN108562616A (en) | A kind of outer detection method of natural gas line | |
| CN109541317B (en) | Earth surface test method for resistance characteristics of coating defects of buried pipeline under stray current interference | |
| JP4044303B2 (en) | Corrosion protection coating damage detection method for buried metal pipes using two kinds of frequency signals | |
| CN209820745U (en) | Multifunctional test field for nuclear power plant buried pipe detection technology | |
| JP2005091191A (en) | Method of detecting defective part in coating of embedded metal pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |