CN103727398B - Buried steel pipe external anti-corrosion layer Indirect testing method - Google Patents
Buried steel pipe external anti-corrosion layer Indirect testing method Download PDFInfo
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- CN103727398B CN103727398B CN201310552033.2A CN201310552033A CN103727398B CN 103727398 B CN103727398 B CN 103727398B CN 201310552033 A CN201310552033 A CN 201310552033A CN 103727398 B CN103727398 B CN 103727398B
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Abstract
The invention discloses a kind of buried steel pipe external anti-corrosion layer Indirect testing method, first give locating pipeling fast, accurately by ACVG method-PCM method, PS method and ac potential gradient method; Then above pipeline, use CIPS method and close spacing potential test, find out the actual true protection potential to metal surface applying and compare with-0.85V protection potential; Secondly apply characteristic frequency ac current signal with ACVG method-PCM method, PS normal direction pipeline, thus fast, accurately find out anticorrosive coat leak source position on the pipeline section filtered out; Then whether occur to corrode to the shape of the anticorrosive coat leak source found out, steel pipe that this leak source is exposed by DCVG method and the degree of this point cathode protection differentiates; Finally evaluate cathodic protection system by CIPS method.The present invention has higher testing precision, and in testing process, detecting instrument can be sampled automatically to data.
Description
Technical field
The present invention relates to method for detecting pipeline field, be specially a kind of buried steel pipe external anti-corrosion layer Indirect testing method.
Background technique
Existing method for detecting pipeline has ACVG method-PCM method, PS method, DCVG method, and CIPS method, these methods are usually used alone.In prior art, ACVG method-PCM method, PS method can not indicate anticorrosive coat quality of protection, can not determine whether anticorrosive coat leak source size and leak source pipeline corrode.DCVG method/CIPS method exists to locating pipeling and finds out the slow-footed problem of leak source.
Summary of the invention
The object of this invention is to provide a kind of buried steel pipe external anti-corrosion layer Indirect testing method, to solve prior art Problems existing.
In order to achieve the above object, the technical solution adopted in the present invention is:
Buried steel pipe external anti-corrosion layer Indirect testing method, is characterized in that: comprise the following steps:
(1) locating pipeling is given fast, accurately by ACVG method-PCM method, PS method and ac potential gradient method;
(2) above pipeline, use CIPS method and close spacing potential test, find out the actual true protection potential to metal surface applying and compare with-0.85V protection potential, filter out the pipeline section of cathodic protection difference, improve detection efficiency;
(3) pipeline section filtered out in step (2) applies characteristic frequency ac current signal with ACVG method-PCM method, PS normal direction pipeline, if there is leak source in anticorrosive coat, signal code will flow out from leak source, and a spherical potential fields is formed centered by leak source, on the ground by detecting the electric potential gradient of this potential fields floor projection, determine the center of potential fields, thus fast, accurately find out anticorrosive coat leak source position;
(4) whether occur to corrode to the shape of the anticorrosive coat leak source that step (3) is found out, steel pipe that this leak source is exposed by DCVG method and the degree of this point cathode protection differentiates, process is as follows:
The center of Pipeline Leakage Point Electric field on earth surface is placed on a rapier, another root rapier is tested by equipotential at center point, according to the isobaric shape of described electric field, shape to breaking point and the position at body judge, because DCVG detection technique have employed asymmetric signal, can judge whether pipeline has electric current to flow into or flow out and whether have cathodic protection;
(5) cathodic protection system is evaluated by CIPS method; its process is: on the pipeline having cathodic protection system by the pipe to soil potential of measuring channel along the change of pipeline analyze the situation that judges anticorrosive coat and cathodic protection whether effective; two kinds of pipe to soil potentials can be obtained, by the population mean quality good or not situation of analyzer tube earth potential along the variation tendency known road pipeline anticorrosion coating of pipeline during measurement.
The present invention has higher testing precision, and in testing process, detecting instrument can be sampled automatically to data.
Embodiment
Buried steel pipe external anti-corrosion layer Indirect testing method, comprises the following steps:
(1) locating pipeling is given fast, accurately by ACVG method-PCM method, PS method and ac potential gradient method;
(2) above pipeline, use CIPS method and close spacing potential test, find out the actual true protection potential to metal surface applying and compare with-0.85V protection potential, filter out the pipeline section of cathodic protection difference, improve detection efficiency;
(3) pipeline section filtered out in step (2) applies characteristic frequency ac current signal with ACVG method-PCM method, PS normal direction pipeline, if there is leak source in anticorrosive coat, signal code will flow out from leak source, and a spherical potential fields is formed centered by leak source, on the ground by detecting the electric potential gradient of this potential fields floor projection, determine the center of potential fields, thus fast, accurately find out anticorrosive coat leak source position;
(4) whether occur to corrode to the shape of the anticorrosive coat leak source that step (3) is found out, steel pipe that this leak source is exposed by DCVG method and the degree of this point cathode protection differentiates, process is as follows:
The center of Pipeline Leakage Point Electric field on earth surface is placed on a rapier, another root rapier is tested by equipotential at center point, according to the isobaric shape of described electric field, shape to breaking point and the position at body judge, because DCVG detection technique have employed asymmetric signal, can judge whether pipeline has electric current to flow into or flow out and whether have cathodic protection;
(5) cathodic protection system is evaluated by CIPS method; its process is: on the pipeline having cathodic protection system by the pipe to soil potential of measuring channel along the change of pipeline analyze the situation that judges anticorrosive coat and cathodic protection whether effective; two kinds of pipe to soil potentials can be obtained, by the population mean quality good or not situation of analyzer tube earth potential along the variation tendency known road pipeline anticorrosion coating of pipeline during measurement.
Claims (1)
1. buried steel pipe external anti-corrosion layer Indirect testing method, is characterized in that: comprise the following steps:
(1) locating pipeling is given fast, accurately by ACVG method-PCM method, PS method and ac potential gradient method;
(2) above pipeline, use CIPS method and close spacing potential test, find out the actual true protection potential to metal surface applying and compare with-0.85V protection potential, filter out the pipeline section of cathodic protection difference, improve detection efficiency;
(3) pipeline section filtered out in step (2) applies characteristic frequency ac current signal with ACVG method-PCM method, PS normal direction pipeline, if there is leak source in anticorrosive coat, signal code will flow out from leak source, and a spherical potential fields is formed centered by leak source, on the ground by detecting the electric potential gradient of this potential fields floor projection, determine the center of potential fields, thus fast, accurately find out anticorrosive coat leak source position;
(4) whether occur to corrode to the shape of the anticorrosive coat leak source that step (3) is found out, steel pipe that this leak source is exposed by DCVG method and the degree of this leak source cathodic protection differentiates, process is as follows:
The center of Pipeline Leakage Point Electric field on earth surface is placed on a rapier, another root rapier is tested by equipotential at center point, according to the isobaric shape of described electric field, shape to breaking point and the position at body judge, because DCVG detection technique have employed asymmetric signal, can judge whether pipeline has electric current to flow into or flow out and whether have cathodic protection;
(5) cathodic protection system is evaluated by CIPS method; its process is: on the pipeline having cathodic protection system by the pipe to soil potential of measuring channel along the change of pipeline analyze the situation that judges anticorrosive coat and cathodic protection whether effective; two kinds of pipe to soil potentials can be obtained, by the population mean quality good or not situation of analyzer tube earth potential along the variation tendency known road pipeline anticorrosion coating of pipeline during measurement.
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| CN201310552033.2A CN103727398B (en) | 2013-11-08 | 2013-11-08 | Buried steel pipe external anti-corrosion layer Indirect testing method |
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| CN201310552033.2A CN103727398B (en) | 2013-11-08 | 2013-11-08 | Buried steel pipe external anti-corrosion layer Indirect testing method |
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| CN103727398B true CN103727398B (en) | 2016-03-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103984030A (en) * | 2014-05-26 | 2014-08-13 | 西南石油大学 | PCM locating method for oil gas station yard buried 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 |
| CN105114821B (en) * | 2015-10-19 | 2017-10-03 | 叶雷 | Embedded metal pipeline leakage 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 |
| CN115875617A (en) * | 2021-09-28 | 2023-03-31 | 中国石油化工股份有限公司 | Method for detecting leakage point of sulfur-containing sewage pipeline |
| CN117825248A (en) * | 2022-12-06 | 2024-04-05 | 江苏晟尔检测仪器有限公司 | Buried pipeline outer anti-corrosion layer detection method with high detection precision |
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