CN103063738A - Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline - Google Patents
Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline Download PDFInfo
- Publication number
- CN103063738A CN103063738A CN2012105561713A CN201210556171A CN103063738A CN 103063738 A CN103063738 A CN 103063738A CN 2012105561713 A CN2012105561713 A CN 2012105561713A CN 201210556171 A CN201210556171 A CN 201210556171A CN 103063738 A CN103063738 A CN 103063738A
- Authority
- CN
- China
- Prior art keywords
- pipeline
- signal
- corrosion layer
- buried
- detection
- 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.)
- Pending
Links
Images
Landscapes
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention relates to the technical field of pipeline inspection, and particularly to a detecting method of an outer anti-corrosion layer of a buried fuel gas steel pipeline. The detecting method is characterized by comprising the following steps: a, dividing a detected pipeline into multiple sections for detection, wherein the distance between detecting points is 50 m; b, connecting two ends of the detected pipeline with insulating flanges; c, applying a low-frequency current signal to the pipeline by using a pipeline signal transmitter of a signal transmission machine, and then detecting the trend of the pipeline on the ground surface and detecting by using a reception machine; and d, transmitting an audio signal to the pipeline by utilizing a transmission machine of a buried pipeline outer anti-corrosion layer detection instrument, connecting an 1000 Hz AC signal with the pipeline, generating an alarm display for an obvious overflow signal by the reception machine when a detector holding the reception machine with a frequency-selective amplifier walks right above the pipeline, and determining the position of the damage of the anti-corrosion layer of the pipeline by the detector based on the audio alarm and the size of the current signal. The two detection technologies, namely, a PCM (Pulse Code Modulation) method and a PEARSON method, are combined for the pipeline detection, so that the detecting method of the outer anti-corrosion layer of the buried fuel gas steel pipeline is excellent in detection precision as well as sensitivity of the outer anti-corrosion layer.
Description
[technical field]
The present invention relates to the pipe detection technical field, specifically a kind of buried combustion gas steel pipe external anti-corrosion layer detection method.
[background technology]
Buried pipeline mainly comprises long defeated (oil gas) pipeline and public gas pipeline, and the buried pipeline in Shanghai mainly comprises more than 900 kilometer long defeated (oil gas) pipeline, reaches several thousand kilometers Urban Buried Gas Pipeline.City gas pipeline is one of important infrastructure of urban construction, it is the important component part of urban energy supply, the gas system is comprised of source of the gas process units, transmission and distribution network and application apparatus three parts, and Urban Buried Gas Pipeline belongs to transmission ﹠ distribution part wherein.
Along with China's rapid development of economy, the gas of China is widely used, gas pipeline has been laid in nearly more than 300 cities by China, coal gas and the natural gas line length in Shanghai City reach 2000 kilometers at present, caliber mostly is greatly φ 159mm, φ 219mm, φ 350mm, φ 500mm, φ 800mm, and table 1.1 is that the part gas pipeline that Shanghai Installation Engineering Co., Ltd. is responsible for installing is in the recent period tabulated:
The part gas pipeline tabulation of table 1.1 Shanghai City
Because the material of the buried gas pipeline of China is used when design pressure is lower than 0.6MPa No. 10, No. 20 steel, the general Q235-B galvanized conduit that adopts when design pressure is higher than 0.6MPa, gas steel pipe, cause in city gas pipeline, cast carbon steel accounts for 39.86%, steel pipe accounts for 38.49%, galvanized conduit accounts for 20.76%, cement pipe accounts for 0.19%, polyethylene pipe accounts for 0.7%, the failure cause of buried pipeline is from the result of statistical study, have approximately 1/3rd to corrode relevant with tube metal, in order to guarantee the safe operation of buried pipeline, increase the service life, generally walk by protecting and overhaul two steps:
Aspect protection, generally be provided with the erosion prevention system that external anti-corrosion layer and cathodic protection form, the breakage of external anti-corrosion layer can cause the cloudy consumption of protecting electric current, the cathodic protection effect of impressed current is reduced even inefficacy, therefore external anti-corrosion layer plays Main Function therein, accurately hold the situation of external anti-corrosion layer, for the supvr of pipeline great perspective meaning is arranged;
Aspect maintenance repair, purpose is to find early the breakage of external anti-corrosion layer, avoids the generation of accident.Aspect detection method, current and voltage method in the pipe, PEARSON detection method (PS), alternating current damped method, frequency conversion-frequency selection method, DC potential gradient detection method (DCVG) are arranged at present, defective is in various degree all arranged when using separately, specifically, current and voltage method in use is subjected to objective restrict in the pipe, disturbs the specificity of instrument and response speed such as AC-to-DC, the setting of testing current stake, the value of the error of 20m pipe range and steel resistivity etc.; The PEARSON detection method needs to detect along walking completely, can not indicate the order of severity of defective, can not indicate CP efficient, can not indicate external anticorrosive coating peeling, relies on operator's technical ability, often provides non-existent defect information; The measurement result of alternating current damped method is not directly perceived, can not indicate CP efficient, can not indicate external anticorrosive coating peeling, is subject to the interference of extraneous electric current; The factor that the result of calculation of frequency conversion-frequency selection method is introduced is many, and error is large, can not determine defect size and position thereof, can not differentiate external anticorrosive coating peeling, can not indicate the CP effect, and it is larger affected by ground environment, but antijamming capability is limited; The DC potential gradient detection method can not be protected effect by the inditron line cathode, can not indicate external anticorrosive coating peeling, needs walking along the line to detect.
[summary of the invention]
The object of the invention is to for solving the deficiency of existing detection technique on independent result of use, a kind of buried combustion gas steel pipe external anti-corrosion layer combined type detection method is proposed, need not excavation, can detect the data to mass efficient of collection, move towards to detect thereby judge the pipeline buried depth; The external anti-corrosion layer performance; And external anti-corrosion layer breaking point location.
For achieving the above object, design a kind of buried combustion gas steel pipe external anti-corrosion layer detection method, it is characterized in that described detection method adopts PCM method and the combination of PEARSON method, step is as follows:
A. institute's testing conduit is divided into some sections and detects, the measuring point spacing is 50 meters;
B. institute testing conduit two ends are connected insulating flange;
C. apply a low-frequency current signal with signal transmitter pipeline signal projector to pipeline, survey on the ground pipeline trend with receiver again and detect, electric current and buried depth of pipeline in the detector tube are found out the anticorrosive coat leak source simultaneously, and estimate the external anti-corrosion layer oeverall quality;
D. the AC signal that utilizes buried pipeline external anti-corrosion layer detector transmitter to launch a sound signal: 1000Hz to pipeline links to each other with pipeline, if pipeline anticorrosion coating is complete good, then signal is along pipe transmmision, progressively weaken, if pipeline anticorrosion coating has breakage, signal will overflow pipeline from breakage, and in this place's surrounding soil, produce stronger field signal, when the testing staff is hand-held when walking directly over pipeline with the receiver of frequency-selecting amplifier, receiver will produce alarm indication to this obvious spill over, and the testing staff can determine according to the size of audio alarm and current signal the position of pipeline anticorrosion coating breakage.
Described low frequency signal is 128Hz.
The present invention utilizes PCM method and two kinds of detection techniques of PEARSON method to be combined into the line pipe road and detects, the external anti-corrosion layer accuracy of detection, sensitivity index is: minimum defect detection area is 1.5 cm 2, the defect level bearing accuracy is 100cm, can the minimum flaw indication decibel value of identification be 40dB, can identify the adjacent continuous defective greater than 2m, the achievement in research of this project can realize External Coating for Buried Steel Pipelines inspection work quality standard of evaluation, with inspection combination technique method, at Qingpu Shanghai external anti-corrosion layer detection sensitivity that gas pipe carries out and precision index verification experimental verification, mortise is full of the road to the gas pipeline inspection of Zhao Chong road and digging in-situ checking, show that the damaged area of detected external anti-corrosion layer is all greater than 1.5cm2, the breaking point bearing accuracy can be found out the breaking point position by excavation greater than the breaking point signal of 40dB in the 100cm scope.
[description of drawings]
Fig. 1 is testing program of the present invention;
Fig. 2-Figure 11 is that the present invention detects data drawing list.
[embodiment]
For purpose, principle and method that the present invention is designed is clearer, existing by reference to the accompanying drawings, form and embodiment be further elaborated, believe for a person skilled in the art and can realize.
Inventive point of the present invention is in conjunction with actual conditions, determines the combine detection technical method, implements the pipeline buried depth and moves towards to detect; External anti-corrosion layer Performance Detection and external anti-corrosion layer breaking point detection and localization.
Embodiment
1. content of the test
(1) the pipeline buried depth moves towards to detect;
(2) external anti-corrosion layer Performance Detection;
(3) external anti-corrosion layer breaking point detection and localization.
2. test apparatus
The standby instrument of this test institute and quantity is as showing shown in the 5.1.1,
Table 5.1.1 instrument and equipment table
| Instrument | Model | Quantity | |
| Electric current mapping system in the pipe | SR-20(PCM) | 1 cover | |
| Buried pipeline external anti-corrosion layer condition detection instrument | SL-2098 | 1 cover | |
| | Utility appliance | 1 cover |
3. confirmed test method and scheme
(1) test method
According to the project of content of the test needs check, determine to adopt following two kinds of detection methods:
1. PCM method
Apply a low frequency (128Hz) current signal with signal transmitter SeekTech ST-510 pipeline signal projector to pipeline, survey on the ground pipeline trend with receiver again and detect, simultaneously electric current and buried depth of pipeline in the detector tube, find out the anticorrosive coat leak source, and estimate the external anti-corrosion layer oeverall quality.
2. PEARSON method
The AC signal that the method utilizes SL-2098 type buried pipeline external anti-corrosion layer detector transmitter to launch a sound signal such as 1000Hz to pipeline links to each other with pipeline, if pipeline anticorrosion coating is complete good, then signal progressively weakens along pipe transmmision.If pipeline anticorrosion coating has breakage, signal will overflow pipeline from breakage, and in this place's surrounding soil, produce stronger field signal, when the testing staff is hand-held when walking directly over pipeline with the receiver of frequency-selecting amplifier, receiver will produce alarm indication to this obvious spill over.The testing staff can determine according to the size of audio alarm and current signal the position of pipeline anticorrosion coating breakage.
(2) testing program
The scheme technology path as shown in Figure 1, at first carries out the pipeline anticorrosion coating condition detection, and its method of inspection is the PCM method; Carry out subsequently defect location, used is the PEARSON method; Ultimate analysis instrument the data obtained, record field data comprehensive detection evaluation assessment is processed field test data, reaches a conclusion, and writes inspection report and check test final report.
4. carry out site test
This test is divided into 10 sections with institute's test tube line and detects, consider pipeline to lay the time limit not long, and use the PE anticorrosion adhesive tape, so the measuring point spacing is decided to be 50m.According to pipeline by way of the characteristics in area and the needs of testing, the 8486m that detects specifically is divided into 10 sections, respectively is from the west to east: mortise is full of the highway section to Shengli road valve well (840m), the Shengli road valve well is to land man bridge section (627m), Lu Jiaqiao is to popular connection Xiang doorway 400 sections (746m) in detective pole west, popular connection Xiang doorway detective pole westerly 400 meters to doorway detective pole (389m), popular connection Xiang detective pole arrives detective pole (425m) before the moral power west door, detective pole is to overpass lower valve well section (1611m) before the moral power west door, overpass lower valve well is to bridge east, the pool, Song pool first detective pole (891m), first detective pole of bridge east, the pool, Song pool is to east, the multiple road of Song first detective pole (1097m), first detective pole of east, the multiple road of Song is full of crossing detective pole (780m) to Song, Song is full of the crossing detective pole to northern blue or green highway Zhao Chong highroad mouth valve well (1080m).
(1) pipeline installation environmental surveys
1. pipeline environment along the line
The pipeline section of testing, major part are arranged in the greenbelt ground of northern blue or green road, and small part is positioned in the farmland.This tube metal section adopts galvanic anode protection, and two ends connect by insulating flange.Pass through on the way Jin Dong be full of greatly bridge, on the sunny side He Qiao, large river for transporting grain to the capital informer times bridge, cross You Dun Gang Qiao, six Jing Qiao, the female Jing Qiao of nasal mucus and seven places, the Tong Po pool, have many hi-lines to pass across the pipeline sky, the part pipeline section has parallel trolley wire along the line.External condition during with design is compared, and environment and topographic condition change quite greatly, and situation is complicated.
On the whole, this section detective pole external inspection is intact, and through test, sacrificial anode can work, and this cathodic protection system is not damaged.
2. alternating current-direct current disturbs investigation
The pipeline that is positioned at northern blue or green highway limit has line of electric force or the communication cable that sets up along the line, and when detective pole was managed interior equivalent current test before moral power west door, reading was not very stable, shows that interchange is disturbed or heavy vehicle disturbs obviously.
(2) pipeline external anti-corrosion layer safe mass situation PCM detects and estimates
Be full of seven of crossing detective poles by detective pole, bridge east, the pool, Song pool detective pole, Song multiple road east detective pole and Song before the blue or green highway in north triumph crossing valve well, Lu Jia gulf bridge safety valve, popular connection Xiang doorway detective pole, the moral power west door and power up signaling point, this ten segment pipes moral anticorrosive coat is detected.
1. pipeline external anti-corrosion layer safe mass situation PCM detects data and analysis
First paragraph pipeline total length 840m, be in blue or green kilometer triumph crossing, the more north of the busier and personnel's dealing of traffic and be full of the road section to mortise, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take the meadow, weeds are as main, the current signal of this pipeline section decays to 2.0mA from 19.0mA, and current attenuation is larger; Buried depth does not wait from 0.75m to 2.24m,
From attenuation change rate Fig. 2 of PCM electric current, can find out, the current attenuation of 0～65m is large, on inspection, valve well is arranged herein, valve well interior conduit anticorrosive quality is not good enough, through SL-2098 and PCM test holiday is arranged, pipeline section current attenuation under 65～415m is less, 465～515m pipeline section place anticorrosive coat quality is not good enough, pipeline anticorrosion coating poor quality within close mortise is full of the crossing valve well has the anticorrosive coat breaking point through PCM and this section of SL-2098, and this pipeline section electric current average attenuation rate is 0.0191899dB/m, anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
Second segment pipeline total length 627m, be in blue or green kilometer triumph crossing, traffic north busier and that personnel's dealing is more to land man bridge section, this segment pipe major part is in northern blue or green highway south of road section, ground surface environment take woods meadow, weeds are as main, and the concrete floor through the plant area doorway is also arranged.The current signal of this pipeline section decays to 16.1mA from 35.7mA, and current attenuation is less; Buried depth does not wait from 0.8m to 1.6m,
From attenuation change rate Fig. 3 of PCM electric current, can find out, the current attenuation of 23～123m is large, on inspection, the anticorrosive coat poor quality, the current attenuation of 273～323m place is larger, and anticorrosive quality is not good enough, and this pipeline section electric current average attenuation rate is 0.0105020 dB/m, external anti-corrosion layer safety case rank is secondary, and the anticorrosive coat total quality is good;
The 3rd depot siding total length 746m, be in the Lu Jiaqiao that traffic is busier and personnel's dealing is more and join detective pole west, Xiang doorway 400m section to masses, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take woods meadow, weeds are as main, this highway section has the segment pipe buried depth more shallow, and anticorrosive quality is poor, and a plurality of leak sources are arranged after testing, the current signal of this pipeline section decays to 7.5 mA from 33.6mA, and current attenuation is larger; Buried depth does not wait from 0.20m～1.50m,
From attenuation change rate Fig. 4 of PCM electric current, can find out, the pipeline section current attenuation of 0～444m is little, the anticorrosive coat quality is better, at 449m and 519m place valve well is arranged respectively, the external anti-corrosion layer poor quality of this segment pipe has leak source, and this pipeline section electric current average attenuation rate is 0.0214874dB/m, anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
The 4th depot siding total length 389m, be in the busier and more masses of personnel's dealing of traffic and join scope about the 400m of detective pole west section, Xiang doorway, the earth's surface is mainly rubble ground and concrete floor is main, and the current signal of this pipeline section decays to 4.2mA from 28.2mA, and current attenuation is larger; Buried depth does not wait from 0.86m～1.4m,
Can find out that 0～200m current attenuation is less from attenuation change rate Fig. 5 of PCM electric current, this section anticorrosive coat quality is better, and 200～389m current attenuation is larger, the anticorrosive coat poor quality, and the current attenuation of 313m place is large, through detecting this depot siding a plurality of leak sources is arranged.This pipeline section electric current average attenuation rate is 0.0475768dB/m, and anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
The 5th depot siding total length 425m is in popular connection Xiang detective pole to moral power west door leading portion, and ground surface environment is green belt along highway, and electric current decays to 20.2mA from 41.7mA; Buried depth does not wait from 1.00m～1.43m,
From attenuation change rate Fig. 6 of PCM electric current, can find out that 0～300m current attenuation is larger, this section anticorrosive coat total quality is general, after testing, near two detective poles anticorrosion bad, also have sacrificial anode point also current attenuation to be played impetus, this pipeline section electric current average attenuation rate is 0.0165735dB/m, and anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
The 6th depot siding total length 1611m, be in northern blue or green highway Nan Delixi detective pole to overpass lower valve well section, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take rubble ground, pitch ground and concrete floor be as main, the current signal of this pipeline section decays to 14.2mA from 34.1mA, and current attenuation is less; Buried depth does not wait from 0.50～1.60m,
From attenuation change rate Fig. 7 of PCM electric current, can find out, this segment pipe current attenuation is totally less, general to 156m segment pipe anticorrosive quality at 126m, through detecting this section flex point is arranged, near the pipeline corrosion protection of overpass lower valve well is fair, and place's holiday is arranged after testing, and this pipeline section electric current average attenuation rate is 0.0029296dB/m, anticorrosive coat safety case rank is secondary, and the anticorrosive coat total quality is good;
The 7th depot siding total length 891m, be in blue or green kilometer Song pool, traffic north busier and that personnel's dealing is more bridge to overpass valve well section, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take woods meadow, weeds are as main, concrete floor through the plant area doorway is also arranged, the current signal of this pipeline section decays to 4.7mA from 44.1mA, and current attenuation is larger; Buried depth does not wait from 0.73m to 4.90m,
Can find out that 150～666m segment pipe external anti-corrosion layer is fair from attenuation change rate Fig. 8 of PCM electric current, there is individual valve well at the 250m place, anticorrosive quality is general, this pipeline section electric current average attenuation rate is 0.0267830dB/m, and anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
The 8th depot siding total length 1097m, be in the traffic pool, Song pool bridge circuit busier and the northern blue or green highway that personnel's dealing is more and answer the highway section to Song, ground surface environment take woods meadow, weeds are as main, concrete floor through the plant area doorway is also arranged, the current signal of this pipeline section decays to 7.26mA from 31.6mA, and current attenuation is less; Buried depth does not wait at 0.78～1.50m,
Can find out that the external anti-corrosion layer of 0～250m pipeline section is fair from attenuation change rate Fig. 9 of PCM electric current, 250～1097m current attenuation is less, and the anticorrosive coat quality is good; The current attenuation of 73～123m is large, on inspection, one leak source is arranged herein, pipeline section current attenuation under 65～455m is less, there is 1 valve well at the 540m place, and anticorrosive quality is not good enough in the same well, and this pipeline section electric current average attenuation rate is 0.0107154dB/m, anticorrosive coat safety case rank is 1 grade, and the anticorrosive coat quality is good;
The 9th depot siding total length 780m, the highway section is full of to Song in the Song road of multiple road and bridge that is in the more northern blue or green highway of the busier and personnel's dealing of traffic, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take woods meadow, weeds are as main, concrete floor through the plant area doorway is also arranged, passes through the Si Mujing bridge.The current signal of this pipeline section decays to 11.0mA from 46.5mA, and current attenuation is larger; Buried depth does not wait from 0.73m to 1.35m,
Can find out that 150m is larger to the current attenuation of 490m from attenuation change rate Figure 10 of PCM electric current, the new group of enterprises of benevolence doorway pipeline external anti-corrosion layer has a leak source, and the pipeline external anti-corrosion layer is fair, and the outer anticorrosive quality of all the other pipeline sections is better.This pipeline section electric current average attenuation rate is 0.0202535dB/m, and anticorrosive coat safety case rank is three grades, and the anticorrosive coat total quality is general;
The tenth depot siding total length 1080m, be in the north blue or green kilometer Song that traffic is busier and personnel's dealing is more and be full of the crossing to Zhao Chong highroad mouth section, this segment pipe major part is in northern blue or green highway south of road pipeline section, ground surface environment take woods meadow, weeds are as main, concrete floor through the plant area doorway is also arranged, cross over Tong Po pool bridge, the current signal of this pipeline section decays to 8.1mA from 30.3mA, and current attenuation is less; Buried depth does not wait from 0.55 to 1.43m,
From attenuation change rate Figure 11 of PCM electric current, can find out, this depot siding current attenuation is totally less, most of anticorrosive quality quality is better, as can be seen from Fig., and in close Zhao Chong highway valve well section, current attenuation is larger, confirm that through detecting valve well gut line anticorrosive quality is relatively poor, valve well has a leak source in about 3 meters westerly after testing, and this pipeline section electric current average attenuation rate is 0.0074178dB/m, anticorrosive coat safety case rank is one-level, and the anticorrosive coat total quality is good.
2. detect the quality assessment of pipeline section anticorrosive coat and statistics
Pipeline section through the PCM detection, Qingpu Shanghai gas pipe institute buried steel gas pipeline carries out external anti-corrosion layer quality condition classification situation according to the current attenuation rate: 4516 meters of one-levels, account for 53.2% of total length, 1056 meters of secondarys, account for 12.4% of total length, three grades 2404 meters, account for 28.3% of total length, 510 meters of level Four, account for 6.0% of total length, the external anti-corrosion layer oeverall quality is general.
(3) determine the safe leak source of pipeline external anti-corrosion layer
For determining the distribution situation of pipeline section breaking point, this test has been carried out the prediction of PCM leak source to most of pipeline section, then carries out repetition measurement with SL-2098, has detected altogether 4600m, damaged 9 places, breaking point 7 places, and wherein 4 places are the sacrificial anode point.Piping failure point distributes and sees Table 5.1.2.
The leak detection of table 5.1.2 external anti-corrosion layer
(4) buried depth of buried, trend and the checking of leak source excavation
In order to verify the accuracy of ground inspection without excavation pipeline rout buried depth and external anti-corrosion layer condition detection, the collection conduit corrosion data, we have selected wherein two places as the excavation point, carried out that identification is determined, move towards to buried depth and the external anti-corrosion layer performance measurement can be worked, through confirming, the buried depth trend there is no error, and leak source is also substantially accurate.
5. conclusion (of pressure testing)
By above-mentioned test, just like drawing a conclusion:
(1) the whole external anti-corrosion layer quality of pipeline is better, without aging corrosion phenomenon, but obvious breaking point is arranged, and doubts as pipeline construction or third party's breakage in installation, should strengthen the monitoring to breaking point;
(2) the pipeline anticorrosion coating breaking point be positioned near the valve well and the flex point place more, may be for due to the construction;
(3) the PCM instrument can effectively detect the overall performance situation of buried pipeline trend, buried depth and anticorrosive coat, and SL-2098 can on the basis that PCM detects, further determine checking PCM equipment detecting pipeline external anti-corrosion layer leak source.
Claims (2)
1. buried combustion gas steel pipe external anti-corrosion layer detection method is characterized in that described detection method step is as follows:
A. institute's testing conduit is divided into some sections and detects, the measuring point spacing is 50 meters;
B. institute testing conduit two ends are connected insulating flange
C. apply a low-frequency current signal with signal transmitter pipeline signal projector to pipeline, survey on the ground pipeline trend with receiver again and detect, electric current and buried depth of pipeline in the detector tube are found out the anticorrosive coat leak source simultaneously, and estimate the external anti-corrosion layer oeverall quality;
D. the AC signal that utilizes buried pipeline external anti-corrosion layer detector transmitter to launch a sound signal: 1000Hz to pipeline links to each other with pipeline, if pipeline anticorrosion coating is complete good, then signal is along pipe transmmision, progressively weaken, if pipeline anticorrosion coating has breakage, signal will overflow pipeline from breakage, and in this place's surrounding soil, produce stronger field signal, when the testing staff is hand-held when walking directly over pipeline with the receiver of frequency-selecting amplifier, receiver will produce alarm indication to this obvious spill over, and the testing staff can determine according to the size of audio alarm and current signal the position of pipeline anticorrosion coating breakage.
2. a kind of buried combustion gas steel pipe external anti-corrosion layer detection method as claimed in claim 1 is characterized in that described low frequency signal is 128Hz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105561713A CN103063738A (en) | 2012-12-19 | 2012-12-19 | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105561713A CN103063738A (en) | 2012-12-19 | 2012-12-19 | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103063738A true CN103063738A (en) | 2013-04-24 |
Family
ID=48106450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105561713A Pending CN103063738A (en) | 2012-12-19 | 2012-12-19 | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103063738A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN103984030A (en) * | 2014-05-26 | 2014-08-13 | 西南石油大学 | PCM locating method for oil gas station yard buried pipeline |
| CN104357853A (en) * | 2014-10-21 | 2015-02-18 | 青岛钢研纳克检测防护技术有限公司 | Detection method for distinguishing sacrificial anode of damaged point of pipeline anticorrosion layer |
| CN105020589A (en) * | 2015-07-03 | 2015-11-04 | 中国石油天然气集团公司 | Synchronous detection method for multiple pipes of oil well gathering and transporting pipeline |
| CN106641741A (en) * | 2016-12-22 | 2017-05-10 | 江苏晟尔检测仪器有限公司 | Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline |
| CN107167419A (en) * | 2017-05-26 | 2017-09-15 | 成都润泰茂成科技有限公司 | A kind of buried pipeline external anti-corrosion layer on-line checking assessment system |
| 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 |
| CN109211977A (en) * | 2018-09-29 | 2019-01-15 | 河北省特种设备监督检验研究院 | Pipeline anticorrosion coating detection device |
| CN109298019A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The credit rating of the underwater through section external anti-corrosion layer of pipeline determines method and device |
| CN109296946A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The determination method and device of the underwater through section external anti-corrosion layer insulation resistivity of pipeline |
| CN109296947A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The localization method and device of the underwater through section external anti-corrosion layer breaking point of pipeline |
| CN109889526A (en) * | 2019-02-28 | 2019-06-14 | 北京市燃气集团有限责任公司 | A kind of burning line collecting method and acquisition device based on position coordinates |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2046171U (en) * | 1988-12-14 | 1989-10-18 | 华北石油管理局勘察设计院 | High voltage insulation flange |
| JPH11160281A (en) * | 1997-11-28 | 1999-06-18 | Nkk Corp | Method and apparatus for detecting coating film damage position of embedded steel tube |
| CN102072405A (en) * | 2010-11-02 | 2011-05-25 | 中国石油化工股份有限公司 | Buried pipeline dynamic simulation leakage detection method, and application and simulation test system thereof |
-
2012
- 2012-12-19 CN CN2012105561713A patent/CN103063738A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2046171U (en) * | 1988-12-14 | 1989-10-18 | 华北石油管理局勘察设计院 | High voltage insulation flange |
| JPH11160281A (en) * | 1997-11-28 | 1999-06-18 | Nkk Corp | Method and apparatus for detecting coating film damage position of embedded steel tube |
| CN102072405A (en) * | 2010-11-02 | 2011-05-25 | 中国石油化工股份有限公司 | Buried pipeline dynamic simulation leakage detection method, and application and simulation test system thereof |
Non-Patent Citations (3)
| Title |
|---|
| 左延田 等: "不开挖检测技术在某埋地燃气管道检测中的应用", 《化工装备技术》 * |
| 左延田 等: "在用埋地管道不开挖检测技术", 《无损检测》 * |
| 赵鹏 等: "埋地钢质管道腐蚀防护检验检测技术组合方法及评价系统研究", 《化工设备与管道》 * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103364442B (en) * | 2012-03-30 | 2018-09-25 | 保定驰骋千里科技有限公司 | Method for evaluating the damage severity degree of an external anticorrosive coating of a 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 |
| CN103984030A (en) * | 2014-05-26 | 2014-08-13 | 西南石油大学 | PCM locating method for oil gas station yard buried pipeline |
| CN104357853A (en) * | 2014-10-21 | 2015-02-18 | 青岛钢研纳克检测防护技术有限公司 | Detection method for distinguishing sacrificial anode of damaged point of pipeline anticorrosion layer |
| CN105020589A (en) * | 2015-07-03 | 2015-11-04 | 中国石油天然气集团公司 | Synchronous detection method for multiple pipes of oil well gathering and transporting pipeline |
| CN105020589B (en) * | 2015-07-03 | 2017-07-28 | 中国石油天然气集团公司 | A kind of oil well gathering line Multi-tube synchronous detection method |
| CN106641741B (en) * | 2016-12-22 | 2018-12-07 | 江苏晟尔检测仪器有限公司 | 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 |
| CN106641741A (en) * | 2016-12-22 | 2017-05-10 | 江苏晟尔检测仪器有限公司 | Device and method for detecting damaged point of outer wall corrosion-resistant layer of extra-buried deep pipeline |
| CN107167419A (en) * | 2017-05-26 | 2017-09-15 | 成都润泰茂成科技有限公司 | A kind of buried pipeline external anti-corrosion layer on-line checking assessment system |
| CN109296946A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The determination method and device of the underwater through section external anti-corrosion layer insulation resistivity of pipeline |
| CN109298019A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The credit rating of the underwater through section external anti-corrosion layer of pipeline determines method and device |
| CN109296947A (en) * | 2017-07-25 | 2019-02-01 | 中国石油天然气股份有限公司 | The localization method and device of the underwater through section external anti-corrosion layer breaking point of pipeline |
| 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 |
| CN108663408B (en) * | 2018-05-18 | 2021-02-09 | 中国石油天然气集团有限公司 | Method for determining breakage rate of steel oil and gas pipeline directional drilling anticorrosive coating |
| CN109211977A (en) * | 2018-09-29 | 2019-01-15 | 河北省特种设备监督检验研究院 | Pipeline anticorrosion coating detection device |
| CN109211977B (en) * | 2018-09-29 | 2020-09-25 | 河北省特种设备监督检验研究院 | Pipeline anticorrosive coating detection device |
| CN109889526A (en) * | 2019-02-28 | 2019-06-14 | 北京市燃气集团有限责任公司 | A kind of burning line collecting method and acquisition device based on position coordinates |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103063738A (en) | Detecting method of outer anti-corrosion layer of buried fuel gas steel pipeline | |
| Hamilton et al. | Leak detection: technology and implementation | |
| CN107145685B (en) | Pipeline dynamic DC influence monitoring system and methods of risk assessment based on the Big Dipper | |
| CN102735996B (en) | Exact locating method for fault points of submarine cable | |
| Makar et al. | Inspecting systems for leaks, pits, and corrosion | |
| Remeshevska et al. | Study of the ways and methods of searching water leaks in water supply networks of the settlements of Ukraine | |
| CN106641741B (en) | 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 | |
| CN110609221A (en) | Automatic monitoring device for pipeline insulating joint and application method thereof | |
| CN105114821A (en) | Detection method for leakage of buried metal pipeline | |
| CN206523564U (en) | A kind of earth resistivity Vertical Observation device | |
| CN109813790B (en) | buried pipeline corrosion rate monitoring system and method under high-voltage direct-current interference | |
| CN103941095A (en) | Method for testing electrical resistivity of earth around underground metallic conduit | |
| CN102954754A (en) | Detection method for equivalent diameter of anticorrosive coating damaged surface of buried steel pipeline | |
| JP4698318B2 (en) | Anticorrosion state monitoring method and system | |
| CN211263679U (en) | Automatic monitoring device for insulated joints of pipelines | |
| CN207541167U (en) | A kind of detecting system of buried steel pipe exchange drain means | |
| CN204114445U (en) | Underground utility positioning device | |
| CN209922080U (en) | Oil leakage monitoring device at bottom of storage tank | |
| CN114086186A (en) | Pipeline protection effect detection device and detection method | |
| Khelif et al. | A multi-wire based technique for leak detection and localization in underground water pipelines | |
| CN111945170A (en) | Cathodic protection system based on oil and gas pipeline | |
| Mimi et al. | Evaluation of water losses in distribution networks: Rammallah as a case study | |
| Chung et al. | Technical standard analysis and optimal monitoring technology to prevent ground subsidence | |
| CN204962302U (en) | Oil gas pipeline water level monitoring early warning system in culvert pipe | |
| CN219752438U (en) | Community gas pipe network corrosion hot spot targeting protection field test and implementation system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130424 |