CN109521084A - A kind of buried pipeline weak magnetic method of determination and evaluation - Google Patents
A kind of buried pipeline weak magnetic method of determination and evaluation Download PDFInfo
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- CN109521084A CN109521084A CN201811395266.5A CN201811395266A CN109521084A CN 109521084 A CN109521084 A CN 109521084A CN 201811395266 A CN201811395266 A CN 201811395266A CN 109521084 A CN109521084 A CN 109521084A
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- defect
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/83—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields
- G01N27/85—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws by investigating stray magnetic fields using magnetographic methods
Abstract
The present invention relates to a kind of buried pipeline weak magnetic method of determination and evaluation characterized by comprising step 1, obtains the detection data based on passive type weak magnetic method detection buried pipeline；Step 2, it is based on the detection data, excavation verifying is carried out to the stress concentrated position of magnetic memory signal abnormal position, and detect to pipe surface magnetic field, obtains ground detection data；Step 3, data are verified according to the excavation of magnetic memory signal abnormal position, defect danger classes composite index, and peak density and its distribution characteristics based on the practical pipeline of ground detection data acquisition is obtained by inverse；Step 4, steel material danger classes is evaluated according to the defect danger classes composite index.The present invention can be realized the accurate evaluation to examined buried pipeline risk.
Description
Technical field
The invention belongs to weak magnetic detection technique field more particularly to a kind of buried pipeline weak magnetic method of determination and evaluation.
Background technique
The detection of passive type weak magnetic method be one kind do not need it is extraneous workpiece to be detected is magnetized, passed through using earth magnetic field
The new technology that the changes of magnetic field generated after defect carries out non-destructive testing, the non-card that can be realized buried pipeline dig non-destructive testing, pole
It is big to reduce equipment detection time and expense.
Metallic conduit is generally used in the industries such as petroleum and petrochemical industry and urban heat supplying, is laid with after operation, due to length
Phase is in underground, environment rather harsh, and the probability that all kinds of corrosion occur for metallic conduit greatly increases, and corrosion once will lead to
The surface physics state of buried metal pipeline changes, and the speed area coverage corroded will also increase.Buried metal pipeline
Own physical state once changes, and necessarily causes the geomagnetic field intensity in its locating space that corresponding variation occurs.
The variation and space magnetic field intensity of buried metal pipeline difference section magnetic conductivity can be detected by the detection of passive type weak magnetic method
Variation, may infer that pipeline goes out the specific location that corrodes, and then scientific commenting is carried out to the physical state of buried pipeline
Valence.
But since the technology is less in practical application, to testing result without relevant evaluation method, the technology is strongly limited
Popularization and application, therefore, it is necessary to provide a kind of reliable data processing scheme for passive type weak magnetic method detection method, and then to institute
The risk for examining buried pipeline carries out accurate evaluation.
Summary of the invention
The object of the present invention is to provide a kind of buried pipeline weak magnetic method of determination and evaluation, by detecting to passive type weak magnetic method
The implementation process of method, detection data processing and the estimation (safe working pressure and safety operation time limit) of applicability parameter,
Realize the purpose to the accurate evaluation of examined buried pipeline risk.
The present invention provides a kind of buried pipeline weak magnetic method of determination and evaluation, comprising:
Step 1, the detection data based on passive type weak magnetic method detection buried pipeline is obtained；
Step 2, it is based on detection data, excavation verifying is carried out to the stress concentrated position of magnetic memory signal abnormal position, and
Pipe surface magnetic field is detected, ground detection data are obtained；
Step 3, data are verified according to the excavation of magnetic memory signal abnormal position, it is comprehensive that defect danger classes is obtained by inverse
Hop index, and peak density and its distribution characteristics based on the practical pipeline of ground detection data acquisition；
Step 4, steel material danger classes is evaluated according to defect danger classes composite index.
Further, the detection of passive type weak magnetic method includes: in step 1
Positioning and label conduit axis, to guarantee that check bit is set to right above pipeline；
The absolute geographical coordinate of surface mark object is recorded, to guarantee that detection data is traceable；
The magnetic anomaly region of temporary reference point label location and check hole position is used along conduit axis direction；
Carry out in verification hole additional defect detection examine, and combine verification hole in additional defect detection examine as a result,
Detection data is calculated again.
Further, the degree that stress is concentrated in step 2 is evaluated by following formula:
Kin=| Δ Hn|/lk
In formula: KinFor pipe surface stress concentration degree；△HnSurface field between two selected measurement points
Difference, unit A/m；lkFor the distance of two selected measurement points, unit m；Measurement point selects magnetic field jump signal peak-to-peak value
Position or near.
Further, defect danger classes composite index is calculated by following formula in step 3:
In formula, F is defect danger classes composite index；A is compensation coefficient, indicates defect of pipeline to the shadow of changes of magnetic field
It rings；KinFor pipe surface stress concentration degree.
Further, step 4 includes:
If defect danger classes composite index F is greater than 20, it is evaluated as serious stress and concentrates, cannot reuse, it should be immediately
Replacement；
If defect danger classes composite index F is greater than 5 and is less than or equal to 20, it is evaluated as obvious stress and concentrates, it can be with
It uses, Ying Jiaqiang periodic detection and monitoring；
If defect danger classes composite index F is greater than 0 and is less than or equal to 5, it is evaluated as concentrating without obvious stress, it can be with
Safe handling.
According to the above aspect of the present invention, can be realized dangerous to examined buried pipeline by buried pipeline weak magnetic method of determination and evaluation
The accurate evaluation of property.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And can be implemented in accordance with the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention and the accompanying drawings.
Detailed description of the invention
Fig. 1 is a kind of flow chart of buried pipeline weak magnetic method of determination and evaluation of the present invention.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiments of the present invention will be described in further detail.Implement below
Example is not intended to limit the scope of the invention for illustrating the present invention.
Join shown in Fig. 1, present embodiments provide a kind of buried pipeline weak magnetic method of determination and evaluation, comprising:
Step S1 obtains the detection data based on passive type weak magnetic method detection buried pipeline；
Step S2 is based on detection data, carries out excavation verifying to the stress concentrated position of magnetic memory signal abnormal position, and
Pipe surface magnetic field is detected, ground detection data are obtained；
Step S3 verifies data according to the excavation of magnetic memory signal abnormal position, obtains defect danger classes by inverse
Composite index, and peak density and its distribution characteristics based on the practical pipeline of ground detection data acquisition；
Step S4 evaluates steel material danger classes according to defect danger classes composite index.
By the buried pipeline weak magnetic method of determination and evaluation, accurately commenting to examined buried pipeline risk can be realized
Valence.
In the present embodiment, the detection of passive type weak magnetic method includes: in step S1
Positioning and label conduit axis, to guarantee that check bit is set to right above pipeline；
The absolute geographical coordinate of surface mark object is recorded, to guarantee that detection data is traceable；
The magnetic anomaly region of temporary reference point label location and check hole position is used along conduit axis direction；
Carry out in verification hole additional defect detection examine, and combine verification hole in additional defect detection examine as a result,
Detection data is calculated again.
In the present embodiment, the degree that stress is concentrated in step S2 is evaluated by following formula:
Kin=| Δ Hn|/lk
In formula: KinFor pipe surface stress concentration degree；△HnSurface field between two selected measurement points
Difference, unit A/m；lkFor the distance of two selected measurement points, unit m；Measurement point selects magnetic field jump signal peak-to-peak value
Position or near.
In the present embodiment, defect danger classes composite index is calculated by following formula in step S3:
In formula, F is defect danger classes composite index；A is compensation coefficient, indicates defect of pipeline to the shadow of changes of magnetic field
It rings；KinFor pipe surface stress concentration degree.
In the present embodiment, step S4 includes:
If defect danger classes composite index F is greater than 20, it is evaluated as serious stress and concentrates, cannot reuse, it should be immediately
Replacement；
If defect danger classes composite index F is greater than 5 and is less than or equal to 20, it is evaluated as obvious stress and concentrates, it can be with
It uses, Ying Jiaqiang periodic detection and monitoring；
If defect danger classes composite index F is greater than 0 and is less than or equal to 5, it is evaluated as concentrating without obvious stress, it can be with
Safe handling.
Invention is further described in detail below.
1, application range
This method is suitable for ferromagnetic metal material, component and weld seam and carries out the assessment of passive type weak magnetic method testing result.It is difficult to understand
Family name's body stainless steel component and weld seam have magnetism under certain condition, are assessed see also this method.
2, detecting step
The detection of passive type weak magnetic method need to include the following steps, just can guarantee data true and accurate:
(1) position and mark conduit axis；Guarantee that check bit is set to right above pipeline.
(2) record of the absolute geographical coordinate of surface mark object；Guarantee that detection data is traceable.
(3) record of pipeline magnetic field cheats position for location and check using temporary reference point label along conduit axis direction
Magnetic anomaly region.
(4) verification hole in additional defect detect examine, in conjunction with verification hole in additional defect detection examine as a result, to inspection
Measured data is calculated again.
3, detection data processing and the estimation of applicability parameter
By detection, excavation verifying is carried out for the stress concentrated position of magnetic memory signal abnormal position, to pipe surface
It is detected in magnetic field.Surface field H can be passed through for pipe surface stress concentration degreepGradient and KinTo evaluate:
Kin=| Δ Hn|/lk
In formula: △ Hn--- the Surface field H between two selected measurement pointspDifference, unit be peace every meter (A/m)；
lk--- the distance of two selected measurement points, unit rice (m).The position or attached of measurement point selection magnetic field jump signal peak-to-peak value
Closely.
4, defect danger classes composite index F is calculated
By the excavation verification to dangerous point, inverse composite index F reflects the peak of practical pipeline by ground detection data
It is worth the feature of density and its distribution.Composite index F, which is calculated by the following formula, to be obtained:
Wherein A --- compensation coefficient shows influence of the defect of pipeline to changes of magnetic field.For earth's surface magnetic flux leakage value and pipeline
The gradient relation of surface magnetic flux leakage value.
According to calculated F value, steel material dangerous grade classification is evaluated by table 1.
1 magnetic anomaly dangerous grade classification of table
| Composite index F value | Explanation |
| Greater than 20 | Serious stress is concentrated, and cannot be reused, should be replaced immediately. |
| From 5 to 20 | Obvious stress is concentrated, and can be used, Ying Jiaqiang periodic detection and monitoring. |
| From 0 to 5 | No obvious stress is concentrated, and can be used safely. |
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of buried pipeline weak magnetic method of determination and evaluation characterized by comprising
Step 1, the detection data based on passive type weak magnetic method detection buried pipeline is obtained；
Step 2, it is based on the detection data, excavation verifying is carried out to the stress concentrated position of magnetic memory signal abnormal position, and
Pipe surface magnetic field is detected, ground detection data are obtained；
Step 3, data are verified according to the excavation of magnetic memory signal abnormal position, defect danger classes synthesis is obtained by inverse and is referred to
Number, and peak density and its distribution characteristics based on the practical pipeline of ground detection data acquisition；
Step 4, steel material danger classes is evaluated according to the defect danger classes composite index.
2. a kind of buried pipeline weak magnetic method of determination and evaluation according to claim 1, which is characterized in that described in step 1
Passive type weak magnetic method detects
Positioning and label conduit axis, to guarantee that check bit is set to right above pipeline；
The absolute geographical coordinate of surface mark object is recorded, to guarantee that detection data is traceable；
The magnetic anomaly region of temporary reference point label location and check hole position is used along conduit axis direction；
Carry out in verification hole additional defect detection examine, and combine verification hole in additional defect detection examine as a result, to inspection
Measured data is calculated again.
3. a kind of buried pipeline weak magnetic method of determination and evaluation according to claim 1 or 2, which is characterized in that institute in step 2
The degree for stating stress concentration is evaluated by following formula:
Kin=| Δ Hn|/lk
In formula: KinFor pipe surface stress concentration degree；△HnThe difference of Surface field between two selected measurement points,
Unit is A/m；lkFor the distance of two selected measurement points, unit m；The position of measurement point selection magnetic field jump signal peak-to-peak value
Near or.
4. a kind of buried pipeline weak magnetic method of determination and evaluation according to claim 3, which is characterized in that described in step 3
Defect danger classes composite index is calculated by following formula:
In formula, F is defect danger classes composite index；A is compensation coefficient, indicates influence of the defect of pipeline to changes of magnetic field；Kin
For pipe surface stress concentration degree.
5. a kind of buried pipeline weak magnetic method of determination and evaluation according to claim 4, which is characterized in that step 4 packet
It includes:
If the defect danger classes composite index F is greater than 20, it is evaluated as serious stress and concentrates, cannot reuse, it should be immediately
Replacement；
If the defect danger classes composite index F is greater than 5 and is less than or equal to 20, it is evaluated as obvious stress and concentrates, it can be with
It uses, Ying Jiaqiang periodic detection and monitoring；
If the defect danger classes composite index F is greater than 0 and is less than or equal to 5, it is evaluated as concentrating without obvious stress, it can be with
Safe handling.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112130100A (en) * | 2020-09-09 | 2020-12-25 | 中国石油天然气股份有限公司 | Method and device for determining residual magnetic signals on end surface of pipeline, computer equipment and medium |
| CN113218541A (en) * | 2021-05-08 | 2021-08-06 | 西南石油大学 | Stress detection method for large-caliber high-steel-grade mountain pipeline |
| CN113361209A (en) * | 2021-07-23 | 2021-09-07 | 南昌航空大学 | Quantitative analysis method for magnetic anomaly of surface defects of high-temperature alloy |
| CN114813919A (en) * | 2022-04-26 | 2022-07-29 | 中国石油天然气股份有限公司玉门油田环庆分公司 | Method for exploring and positioning pipeline punching and oil stealing points based on weak magnetic detection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112130100A (en) * | 2020-09-09 | 2020-12-25 | 中国石油天然气股份有限公司 | Method and device for determining residual magnetic signals on end surface of pipeline, computer equipment and medium |
| CN113218541A (en) * | 2021-05-08 | 2021-08-06 | 西南石油大学 | Stress detection method for large-caliber high-steel-grade mountain pipeline |
| CN113361209A (en) * | 2021-07-23 | 2021-09-07 | 南昌航空大学 | Quantitative analysis method for magnetic anomaly of surface defects of high-temperature alloy |
| CN114813919A (en) * | 2022-04-26 | 2022-07-29 | 中国石油天然气股份有限公司玉门油田环庆分公司 | Method for exploring and positioning pipeline punching and oil stealing points based on weak magnetic detection |
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