CN109654379A - A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method - Google Patents
A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application method Download PDFInfo
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- CN109654379A CN109654379A CN201910047388.3A CN201910047388A CN109654379A CN 109654379 A CN109654379 A CN 109654379A CN 201910047388 A CN201910047388 A CN 201910047388A CN 109654379 A CN109654379 A CN 109654379A
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- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The invention discloses a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system and application methods；It is related to underground piping detection technology field；A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system, including central processing system, pipeline external anti-corrosion layer detection module, duct size information detection module, geological environment detection module, geographical location detection module and mobile terminal；Central processing system includes communication module, data analysis module, data memory module and data transmit-receive module；Pipeline external anti-corrosion layer detection module, duct size information detection module, geological environment detection module and the equal communication connection central processing system of geographical location detection module；Data transmit-receive module connects mobile terminal by communication module；The invention also discloses the application methods of non-metallic pipe pipeline external anticorrosive coating breakage detection system.While the present invention accurately detects buried nonmetal pipeline external anti-corrosion layer breakage；Also pipeline relevant information is recorded；And it will test result in time and be sent to mobile terminal.
Description
Technical field
The present invention relates to underground piping detection technology field more particularly to a kind of non-metallic pipe pipeline external anticorrosive coating damage testings
System and application method.
Background technique
Critical facility one of of the buried pipeline as ground surface works；Buried pipeline is connection upstream resource and downstream user
Tie；Since pipeline is embedded in underground for a long time；Over time, the influence of the factors such as extraneous soil characteristic and landform sedimentation；
Burn into perforation and leakage can occur for pipeline；Cause huge economic loss；
Buried pipeline can be divided into metallic conduit and nonmetal pipeline according to material；Pipeline is done into preservative treatment embedment ground
Under, for the resources such as the petroleum of upstream, natural gas to be delivered in downstream sources scarcity area or big city；For stone
The pipeline that the resources such as oil, natural gas use when conveying is mostly nonmetal pipeline；Nonmetal pipeline pushing away with the time when in use
Shifting will appear aging, embrittlement and removing；Nonmetal pipeline corrosion failure is eventually led to, nonmetal pipeline is caused to reveal；
It is protected since the junction of two sections of nonmetal pipelines is welded using metal material, and in its outer plus erosion resistant coating；Two
The junction of section nonmetal pipeline is easier that the breakage of erosion resistant coating occurs；Need a kind of non-metallic pipe pipeline external anticorrosive coating damaged thus
Detection system and application method safeguard the pipeline of buried underground.
Summary of the invention
To solve technical problem present in background technique, the present invention proposes a kind of non-metallic pipe pipeline external anticorrosive coating breakage inspection
Examining system and application method, while detection to buried nonmetal pipeline external anti-corrosion layer breakage, and to pipeline location
The geographical location in domain, the attribute information of pipeline and defect information are counted；It will test result save and be sent in time
Mobile terminal；Relevant staff is allowed to know.
A kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention, including central processing system, pipeline
External anti-corrosion layer detection module, duct size information detection module, geological environment detection module, geographical location detection module and movement are eventually
End；Central processing system includes communication module, data analysis module, data memory module and data transmit-receive module；
Pipeline external anti-corrosion layer detection module communication connection central processing system, for detecting buried nonmetal pipeline erosion resistant coating
The position of breaking point；
Duct size information detection module communication connection central processing system, for detecting and recording the category of buried nonmetal pipeline
Property information and defect information；
Geological environment detection module communication connection central processing system, for detecting region locating for buried nonmetal pipeline
Soil resistivity, soil redox potential, P in soil H value and soil moisture；
Geographical location detection module communication connection central processing system, for detecting buried nonmetal pipeline region
Geographical coordinate, and nonmetal pipeline is moved towards to carry out precise positioning；
Data analysis module is for handling the data information that central processing system receives；
Data memory module is used for that treated that data store by data analysis module；
Data transmit-receive module connects mobile terminal by communication module；Data transmit-receive module is used for receiving pipeline external anti-corrosion layer
The information of detection module, duct size information detection module, geological environment detection module and the conveying of geographical location detection module；And it will count
According to analysis module, treated that information is sent to mobile terminal.
Preferably, pipeline external anti-corrosion layer detection module includes transmitter, the first rapier main body, the second rapier main body and detection
Instrument；
Transmitter is electrically connected the cable line terminals drawn on the test pile of buried nonmetal pipeline by conducting wire；
First rapier main body is identical with the second rapier main structure；First rapier main body one end is equipped with probe；First
The rapier main body other end is equipped with lever；Lever connects the first rapier main body, and which is provided with connector；Probe connects the first rapier
Main body, and pass through conducting wire and connector communication connection；
Detector includes power supply unit, input protection unit, adjusts unit, is magnification processing, noise reduction filtering unit, micro-
Controller unit and display unit；
Power supply unit is electrically connected probe by conducting wire, connector, input protection unit, adjusts unit, enhanced processing list
Member, noise reduction filtering unit, micro controller unit and display unit；
Micro controller unit communication connection probe, input protection unit, adjusts unit, magnification processing, drop at connector
It makes an uproar filter unit and display unit.
Preferably, the attribute information of buried nonmetal pipeline includes that pipeline name, pipeline coordinate, buried depth of pipeline, pipeline are walked
To, pipeline specifications and material, outer cover type, detection time and maintenance history；The defect information of buried nonmetal pipeline
Defect shape, the pipeline external anti-corrosion layer of coordinate, pipeline external anti-corrosion layer breakage formation including pipeline external anti-corrosion layer breakage are damaged
Defect size, the breakage reparation suggestion of pipeline external anti-corrosion layer and the subsequent reparation situation of formation.
Preferably, buried nonmetal pipeline buried depth and trend are detected using Ground Penetrating Radar method.
Preferably, geological environment detection module includes ground resistance measuring instrument, number display type platinum electrode, the analysis of P in soil H value
Meter and soil humidity sensor.
Preferably, geographical location detection module communication connection Beidou satellite navigation system or GPS.
Preferably, mobile terminal is cell phone client or computer client.
The application method of above-mentioned non-metallic pipe pipeline external anticorrosive coating breakage detection system, comprising the following specific steps
S1, the attribute information and defect information of pipeline are recorded；
Staff detects buried nonmetal pipeline buried depth and trend using ground penetrating radar detection in work；To buried non-gold
The specification and material of metal conduit, outer cover type and detection time are registered, and are sat to previous maintenance history and pipeline
Mark is checked；
S2, the geographical coordinate of pipeline position is determined；
In work, staff is using Beidou satellite navigation system or GPS in detection zone
The geographical coordinate of buried pipeline is indicated, and is carried out record and compared with previous record；Simultaneously to pipeline outside
The coordinate of erosion resistant coating breakage is marked in detail；
S3, the geological environment of position outside pipeline is detected；
Staff measures the ground resistance of soil using equidistant four electrode method ground resistance measuring instrument when detection；Using
Digital display type platinum electrode measures the oxidation-reduction potential and pH value of soil, and soil corruption is judged according to oxidation-reduction potential
Corrosion；P in soil H value is detected using P in soil H value analysis meter；Use the humidity of soil humidity sensor detection soil；And it will test
Data are recorded, and testing result is generated；The especially needed geological environment to pipeline external anti-corrosion layer breakage detects；According to
The numerical value of the geological environment detection of pipeline external anti-corrosion layer breakage is analyzed；And it can be in later detection according to pipeline
Soil in locating region is detected, and the soil analysis result newly detected and previous detection numerical value are compared, carried out pre-
Whether the pipeline external anti-corrosion layer sentenced in region occurs breakage, to improve working efficiency；
S4, pipeline external anti-corrosion layer breakage is detected；
When work, transmitter is electrically connected by testing staff by conducting wire draws on the test pile of buried nonmetal pipeline
Cable line terminals；By the first rapier main body and the second rapier main body along the soil above pipeline insertion tube road spaced apart
In；Apply one group of 128Hz high-frequency ac signal simultaneously to Target pipe (high-frequency is often referred to the frequency not less than 128Hz)
(high-frequency is low-frequency 10-300 times, and two groups of application are closed in frequency multiplication with the low frequency ac signal of two groups of 3Hz and 6Hz
The low frequency ac signal of system is used to determine current direction based on phase-comparison circuit)；Utilize the high-frequency signal of application
It adjusts the spacing of the first rapier main body and the second rapier main body and confirms that (stationary singnal is often referred to potential difference for the size of stationary singnal
Value is less than 50mV), it is step pitch along pipe using the distance of the first rapier main body and the second rapier main body at this time after stationary singnal is stablized
It longitudinally detects in road；
When detection, the low frequency sine wave signal of the 3Hz and 6Hz of application after input protection unit carries out voltage-limiting protection,
It is handled after being amplified, being filtered by micro controller unit, the signal of 3Hz is subjected to frequency multiplication and amplifies to obtain that two frequencies are identical to be
The signal of 8Hz；Phase-comparison circuit is input to identify the phase of respective signal and be compared, display unit to potential difference and
The direction of erosion resistant coating breakage is shown in display unit with arrow and db value:
If two sine wave signals are identical, arrow forward, indicates erosion resistant coating breaking point in detection zone in display unit
Between front；
If two 180 ° of sine wave signal phase difference, the arrow in display unit backward, indicates erosion resistant coating breaking point
At the rear of detection interval；
If the first rapier main body is basic consistent with stationary singnal with the intersubjective potential difference of the second rapier, then it represents that anti-
Rotten layer is without breakage；
If the first rapier main body and the intersubjective potential difference of the second rapier are reduced to close to zero after increasing again, then it represents that
Erosion resistant coating breaking point and detection interval are overlapped；
Detection interval is closer apart from erosion resistant coating breakage, then signal level intensity is higher；Otherwise it is lower；
S5, the information of detection is handled；And it generates record and is saved；It will test result and be sent to mobile terminal；
The data that S1 to S4 is detected are collected, handle and save；And it will test result and be sent to related work people
The cell phone client or computer client of member；Staff is allowed to know the damaged result of the erosion resistant coating of pipeline；And it is right
Erosion resistant coating occurs damaged pipeline and is timely repaired.
In the present invention, can to buried nonmetal pipeline external anti-corrosion layer, whether breakage is detected, while can be to pipeline corrosion protection
The soil information that damaged area occurs for layer carries out detection reservation and summarizes；And it can be according to the soil information and location detected in the past
The soil information of domain detection is compared, and carries out whether the pipeline in investigation relevant range occurs erosion resistant coating breakage, to improve
Detection efficiency；Precise positioning, the geographical coordinate of record detection pipeline can be also carried out to detection zone；And when detection afterwards pair
Relevant range carries out emphasis investigation；The every terms of information of result and acquisition to detection is sent to central processing system progress in real time
Data Analysis Services；Central processing system saves received data, and the data information received production result is sent out
Sending to the mobile phone terminal of relevant staff or computer terminal allows relevant staff to know testing result in time；When detecting
When non-metallic pipe pipeline external anticorrosive coating occurs damaged relevant staff can know at the first time and maintenance project be made it is right in time
Pipeline anticorrosion coating breakage repairs.
Detailed description of the invention
Fig. 1 is a kind of functional block diagram of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention.
Fig. 2 is a kind of process of the application method of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention
Figure.
Specific embodiment
As shown in Figs. 1-2, Fig. 1 is a kind of principle of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention
Block diagram.
Fig. 2 is a kind of process of the application method of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention
Figure.
Referring to Fig.1-2, a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system proposed by the present invention, including central processing
System, pipeline external anti-corrosion layer detection module, duct size information detection module, geological environment detection module, geographical location detection module
And mobile terminal；Central processing system includes communication module, data analysis module, data memory module and data transmit-receive module；
Pipeline external anti-corrosion layer detection module communication connection central processing system, for detecting buried nonmetal pipeline erosion resistant coating
The position of breaking point；
Duct size information detection module communication connection central processing system, for detecting and recording the category of buried nonmetal pipeline
Property information and defect information；
Geological environment detection module communication connection central processing system, for detecting region locating for buried nonmetal pipeline
Soil resistivity, soil redox potential, P in soil H value and soil moisture；
Geographical location detection module communication connection central processing system, for detecting buried nonmetal pipeline region
Geographical coordinate, and nonmetal pipeline is moved towards to carry out precise positioning；
Data analysis module is for handling the data information that central processing system receives；
Data memory module is used for that treated that data store by data analysis module；
Data transmit-receive module connects mobile terminal by communication module；Data transmit-receive module is used for receiving pipeline external anti-corrosion layer
The information of detection module, duct size information detection module, geological environment detection module and the conveying of geographical location detection module；And it will count
According to analysis module, treated that information is sent to mobile terminal.
In a specific embodiment, pipeline external anti-corrosion layer detection module includes transmitter, the first rapier main body, the second rapier
Main body and detector；
Transmitter is electrically connected the cable line terminals drawn on the test pile of buried nonmetal pipeline by conducting wire；
First rapier main body is identical with the second rapier main structure；First rapier main body one end is equipped with probe；First
The rapier main body other end is equipped with lever；Lever connects the first rapier main body, and which is provided with connector；Probe connects the first rapier
Main body, and pass through conducting wire and connector communication connection；
Detector includes power supply unit, input protection unit, adjusts unit, is magnification processing, noise reduction filtering unit, micro-
Controller unit and display unit；
Power supply unit is electrically connected probe by conducting wire, connector, input protection unit, adjusts unit, enhanced processing list
Member, noise reduction filtering unit, micro controller unit and display unit；
Micro controller unit communication connection probe, input protection unit, adjusts unit, magnification processing, drop at connector
It makes an uproar filter unit and display unit.
In a specific embodiment, the attribute information of buried nonmetal pipeline includes that pipeline name, pipeline coordinate, pipeline bury
Depth, pipeline rout, pipeline specifications and material, outer cover type, detection time and maintenance history；Buried nonmetal pipeline
Defect information includes the defect shape, anti-outside pipeline that the coordinate of pipeline external anti-corrosion layer breakage, pipeline external anti-corrosion layer breakage are formed
Defect size, the breakage reparation suggestion of pipeline external anti-corrosion layer and the subsequent reparation situation that rotten layer breakage is formed.
In a specific embodiment, buried nonmetal pipeline buried depth and trend are detected using Ground Penetrating Radar method.
In a specific embodiment, geological environment detection module includes ground resistance measuring instrument, number display type platinum electrode, soil
Earth pH value analysis meter and soil humidity sensor.
In a specific embodiment, geographical location detection module communication connection Beidou satellite navigation system or global satellite
Positioning system.
In a specific embodiment, mobile terminal is cell phone client or computer client.
The application method of above-mentioned non-metallic pipe pipeline external anticorrosive coating breakage detection system is also provided, comprising the following specific steps
S1, the attribute information and defect information of pipeline are recorded；
Staff detects buried nonmetal pipeline buried depth and trend using ground penetrating radar detection in work；To buried non-gold
The specification and material of metal conduit, outer cover type and detection time are registered, and are sat to previous maintenance history and pipeline
Mark is checked；
S2, the geographical coordinate of pipeline position is determined；
In work, staff is using Beidou satellite navigation system or GPS in detection zone
The geographical coordinate of buried pipeline is indicated, and is carried out record and compared with previous record；Simultaneously to pipeline outside
The coordinate of erosion resistant coating breakage is marked in detail；
S3, the geological environment of position outside pipeline is detected；
Staff measures the ground resistance of soil using equidistant four electrode method ground resistance measuring instrument when detection；Using
Digital display type platinum electrode measures the oxidation-reduction potential and pH value of soil, and soil corruption is judged according to oxidation-reduction potential
Corrosion；P in soil H value is detected using P in soil H value analysis meter；Use the humidity of soil humidity sensor detection soil；And it will test
Data are recorded, and testing result is generated；The especially needed geological environment to pipeline external anti-corrosion layer breakage detects；According to
The numerical value of the geological environment detection of pipeline external anti-corrosion layer breakage is analyzed；And it can be in later detection according to pipeline
Soil in locating region is detected, and the soil analysis result newly detected and previous detection numerical value are compared, carried out pre-
Whether the pipeline external anti-corrosion layer sentenced in region occurs breakage, to improve working efficiency；
S4, pipeline external anti-corrosion layer breakage is detected；
When work, transmitter is electrically connected by testing staff by conducting wire draws on the test pile of buried nonmetal pipeline
Cable line terminals；By the first rapier main body and the second rapier main body along the soil above pipeline insertion tube road spaced apart
In；Apply one group of 128Hz high-frequency ac signal simultaneously to Target pipe (high-frequency is often referred to the frequency not less than 128Hz)
(high-frequency is low-frequency 10-300 times, and two groups of application are closed in frequency multiplication with the low frequency ac signal of two groups of 3Hz and 6Hz
The low frequency ac signal of system is used to determine current direction based on phase-comparison circuit)；Utilize the high-frequency signal of application
It adjusts the spacing of the first rapier main body and the second rapier main body and confirms that (stationary singnal is often referred to potential difference for the size of stationary singnal
Value is less than 50mV), it is step pitch along pipe using the distance of the first rapier main body and the second rapier main body at this time after stationary singnal is stablized
It longitudinally detects in road；
When detection, the low frequency sine wave signal of the 3Hz and 6Hz of application after input protection unit carries out voltage-limiting protection,
It is handled after being amplified, being filtered by micro controller unit, the signal of 3Hz is subjected to frequency multiplication and amplifies to obtain that two frequencies are identical to be
The signal of 8Hz；Phase-comparison circuit is input to identify the phase of respective signal and be compared, display unit to potential difference and
The direction of erosion resistant coating breakage is shown in display unit with arrow and db value:
If two sine wave signals are identical, arrow forward, indicates erosion resistant coating breaking point in detection zone in display unit
Between front；
If two 180 ° of sine wave signal phase difference, the arrow in display unit backward, indicates erosion resistant coating breaking point
At the rear of detection interval；
If the first rapier main body is basic consistent with stationary singnal with the intersubjective potential difference of the second rapier, then it represents that anti-
Rotten layer is without breakage；
If the first rapier main body and the intersubjective potential difference of the second rapier are reduced to close to zero after increasing again, then it represents that
Erosion resistant coating breaking point and detection interval are overlapped；
Detection interval is closer apart from erosion resistant coating breakage, then signal level intensity is higher；Otherwise it is lower；
S5, the information of detection is handled；And it generates record and is saved；It will test result and be sent to mobile terminal；
The data that S1 to S4 is detected are collected, handle and save；And it will test result and be sent to related work people
The cell phone client or computer client of member；Staff is allowed to know the damaged result of the erosion resistant coating of pipeline；And it is right
Erosion resistant coating occurs damaged pipeline and is timely repaired.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system, which is characterized in that including anti-outside central processing system, pipeline
Rotten layer detection module, duct size information detection module, geological environment detection module, geographical location detection module and mobile terminal；In
Entreating processing system includes communication module, data analysis module, data memory module and data transmit-receive module；
Pipeline external anti-corrosion layer detection module communication connection central processing system, it is damaged for detecting buried nonmetal pipeline erosion resistant coating
The position of point；
Duct size information detection module communication connection central processing system, the attribute for detecting and recording buried nonmetal pipeline are believed
Breath and defect information；
Geological environment detection module communication connection central processing system, for detecting the soil in region locating for buried nonmetal pipeline
Resistivity, soil redox potential, P in soil H value and soil moisture；
Geographical location detection module communication connection central processing system, for detecting the geography of buried nonmetal pipeline region
Coordinate, and nonmetal pipeline is moved towards to carry out precise positioning；
Data analysis module is for handling the data information that central processing system receives；
Data memory module is used for that treated that data store by data analysis module；
Data transmit-receive module connects mobile terminal by communication module；Data transmit-receive module is detected for receiving pipeline external anti-corrosion layer
The information of module, duct size information detection module, geological environment detection module and the conveying of geographical location detection module；And data are divided
Information after analysis resume module is sent to mobile terminal.
2. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 1, which is characterized in that outside pipeline
Erosion resistant coating detection module includes transmitter, the first rapier main body, the second rapier main body and detector；
Transmitter is electrically connected the cable line terminals drawn on the test pile of buried nonmetal pipeline by conducting wire；
First rapier main body is identical with the second rapier main structure；First rapier main body one end is equipped with probe；First rapier
The main body other end is equipped with lever；Lever connects the first rapier main body, and which is provided with connector；Probe connects the first rapier master
Body, and pass through conducting wire and connector communication connection；
Detector includes power supply unit, input protection unit, adjusts unit, magnification processing, noise reduction filtering unit, microcontroller
Device unit and display unit；
Power supply unit is electrically connected probe by conducting wire, connector, input protection unit, adjusts unit, magnification processing, drop
It makes an uproar filter unit, micro controller unit and display unit；
Micro controller unit communication connection probe, input protection unit, adjusts unit, magnification processing, noise reduction filter at connector
Wave unit and display unit.
3. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 1, which is characterized in that buried non-
The attribute information of metallic conduit includes pipeline name, pipeline coordinate, buried depth of pipeline, pipeline rout, pipeline specifications and material, is cladded with
Cover Types, detection time and maintenance history；The defect information of buried nonmetal pipeline includes pipeline external anti-corrosion layer breakage
Coordinate, the defect size, anti-outside pipeline that is formed of the defect shape that is formed of pipeline external anti-corrosion layer breakage, pipeline external anti-corrosion layer breakage
Rotten layer breakage reparation suggestion and subsequent reparation situation.
4. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 3, which is characterized in that buried non-
Metallic conduit buried depth and trend are detected using Ground Penetrating Radar method.
5. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 1, which is characterized in that geology ring
Border detection module includes ground resistance measuring instrument, number display type platinum electrode, P in soil H value analysis meter and soil humidity sensor.
6. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 1, which is characterized in that geographical position
Set detection module communication connection Beidou satellite navigation system or GPS.
7. a kind of non-metallic pipe pipeline external anticorrosive coating breakage detection system according to claim 1, which is characterized in that mobile whole
End is cell phone client or computer client.
8. a kind of application method of non-metallic pipe pipeline external anticorrosive coating breakage detection system, which is characterized in that including walking in detail below
It is rapid:
S1, the attribute information and defect information of pipeline are recorded；
S2, the geographical coordinate of pipeline position is determined；
S3, the geological environment of position outside pipeline is detected；
S4, pipeline external anti-corrosion layer breakage is detected；
S5, the information of detection is handled；And it generates record and is saved；It will test result and be sent to mobile terminal.
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| CN110672151A (en) * | 2019-09-23 | 2020-01-10 | 中国石油天然气集团有限公司 | Evaluation method for pipeline repairing effect by using epoxy steel sleeve |
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| CN108334607A (en) * | 2018-02-02 | 2018-07-27 | 中石油管道有限责任公司西部兰州输气分公司 | A kind of buried pipeline external anti-corrosion layer breakage detection method and system |
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