CN111337565A - Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall - Google Patents
Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall Download PDFInfo
- Publication number
- CN111337565A CN111337565A CN202010298781.2A CN202010298781A CN111337565A CN 111337565 A CN111337565 A CN 111337565A CN 202010298781 A CN202010298781 A CN 202010298781A CN 111337565 A CN111337565 A CN 111337565A
- Authority
- CN
- China
- Prior art keywords
- stainless steel
- wall thickness
- value
- frequency electromagnetic
- medium
- 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
Classifications
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
- G01B7/10—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness using magnetic means, e.g. by measuring change of reluctance
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The invention belongs to the field of nondestructive detection of stainless steel pipelines in the basic chemical industry and the petroleum refining industry, is suitable for detecting and scanning corrosion defects of the stainless steel pipelines on line, and can quickly find and position potential safety hazard positions. The invention comprises a medium-frequency electromagnetic host, a sensor assembly with an incremental pedometer, a data processing terminal, a 6-core cable, a support accessory and the like. The feedback signal received by the host computer is transmitted to the data processing terminal by the Bluetooth. The system utilizes a special algorithm aiming at stainless steel pipeline signal processing, realizes continuous scanning of the wall thickness of the stainless steel pipeline under the condition of no need of surface processing, is suitable for the detection requirements of different pipe diameters, and can realize quick scanning of corrosion defects in the stainless steel and semi-quantitative calculation of the severity of the defects at the temperature of 300 ℃. The step counting device in the system sensor can accurately determine the position of the corrosion defect, and quickly, directly and accurately position the corrosion defect in the stainless steel pipeline.
Description
Technical Field
The invention belongs to the field of nondestructive testing of stainless steel pipelines in the basic chemical industry and the petroleum refining industry, and particularly relates to a medium-frequency electromagnetic measurement method and device for scanning corrosion defects of a stainless steel pipe wall.
Background
During the operation of basic chemical and petroleum refining devices, stainless steel materials are generally adopted as pipe materials for pipelines with corrosion risks, and once the pipelines adopting the stainless steel materials are corroded, serious consequences are caused, and the wall thickness measurement needs to be carried out on the pipelines. The existing stainless steel pipeline wall thickness measuring method generally adopts a traditional ultrasonic thickness gauge to carry out fixed-point measurement. Because the ultrasonic thickness gauge can only measure the thickness at fixed points, continuous scanning cannot be realized, missing detection easily occurs or the area with the most serious defects cannot be detected, and the defects are more.
The system can realize the continuous scanning function of the stainless steel pipeline, does not need to treat the surface of the pipeline, remove shallow heat preservation and use a coupling agent, and has high detection speed and high detection precision.
Disclosure of Invention
The invention aims to provide a medium-frequency electromagnetic measurement method and a medium-frequency electromagnetic measurement device for scanning corrosion defects of a stainless steel pipe wall.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a medium frequency electromagnetic measuring device for scanning corrosion defects of stainless steel pipe walls comprises:
the medium-frequency electromagnetic host is used for transmitting electromagnetic signals to the sensing line assembly;
the sensor assembly is used for acquiring a detection signal of a detection part of the stainless steel pipeline to be detected and sending the detection signal to the data processing terminal through the medium-frequency electromagnetic host;
and the data processing terminal is used for processing the detection signal, extracting a characteristic value of the wall thickness of the stainless steel pipeline in the detection signal and displaying a real-time imaging result of the wall thickness value of the stainless steel pipeline.
The sensor assembly consists of a transmitting coil, a receiving coil and an incremental pedometer, is arranged on the outer surface of the stainless steel pipeline and can move continuously; the sensor assembly has a step counting function and is used for positioning a detection position.
The medium-frequency electromagnetic host is connected with the sensor assembly through a cable; the intermediate frequency electromagnetic host is in wireless connection with the data processing terminal through Bluetooth.
A medium-frequency electromagnetic measurement method for scanning corrosion defects of a stainless steel pipe wall comprises the following steps:
1) placing a sensor assembly on the outer surface of a stainless steel pipeline to be detected, and sending an electromagnetic signal by using a medium-frequency electromagnetic host; continuously moving the sensor assembly, and acquiring detection signals covered by a scanning area through the sensor assembly;
2) a detection signal acquired by the sensor assembly is filtered by the medium-frequency electromagnetic host and then transmitted to the data processing terminal through Bluetooth;
3) the data processing terminal processes the processed detection signals and extracts characteristic values in the detection signals;
4) calculating the wall thickness value of the stainless steel pipeline by using the characteristic value;
5) measuring the wall thickness value of a certain point of the stainless steel pipeline to be measured by using an ultrasonic thickness gauge, and comparing the wall thickness value with the wall thickness value of the stainless steel pipeline calculated in the step 4) to obtain a calibration coefficient;
6) multiplying the wall thickness value of the stainless steel pipeline obtained in the step 4) by the calibration coefficient obtained in the step 5) to obtain a calibrated wall thickness value of the stainless steel pipeline;
7) and the data processing terminal displays the detection position and the real-time imaging result of the wall thickness value of the stainless steel pipeline obtained in the step 6).
The transmission frequency of the electromagnetic signal sent by the medium-frequency electromagnetic host is between 16 and 32HZ, and the transmission voltage value of the electromagnetic signal is between 1 and 10V.
The detection signal comprises an induced voltage value and a step-counting positioning value which are generated in the process of transmitting the electromagnetic signal and decay along with time.
The step 3) is specifically as follows:
3.1) the data processing terminal receives each processed detection position time window data sent and sent by the medium-frequency electromagnetic host: removing the first 0-5 time windows according to 20-31 time windows distributed in time, namely removing the magnetic saturation area;
3.2) calculating the 'lg (induced voltage V) and lg (response time T)' of each residual time window;
3.3) calculating the slope K value of four-point fitting straight lines of four adjacent time windows 'lg (response time T) and lg (induced voltage V)';
3.4) comparing the slope K values calculated in the step 3.3), and selecting a maximum K value Kmax;
3.5) selecting a time window corresponding to Kmax, and simultaneously selecting data of the time window and the first three time windows as a selection interval;
3.6) calculating the 'response time T, lg (induced voltage V)' of four time windows in the selection interval to fit the slope of a four-point straight line, and solving the absolute value of the slope, wherein the absolute value of the slope is the characteristic value S.
Each time window includes a response time T and a corresponding induced voltage value V.
The step 4) is specifically as follows:
4.1) measuring the standard test blocks with different wall thicknesses to obtain a group of characteristic value groups corresponding to known wall thickness values;
4.2) fitting the known wall thickness value and the characteristic value set in the step 4.1) to obtain a relational expression of the wall thickness and the characteristic value of the stainless steel pipeline;
4.3) substituting the characteristic value of the actual unknown wall thickness obtained in the step 3.6) into the relational expression in the step 4.2) to obtain the actual unknown wall thickness value of the corresponding position.
The relation between the wall thickness of the stainless steel pipeline and the characteristic value is as follows:
D＝R*SB，
where D is the stainless steel pipeline wall thickness, S is the characteristic value, and R, B is a constant.
The invention has the following beneficial effects and advantages:
1. the invention can monitor the wall thickness of the stainless steel without removing a coating layer and an anticorrosive coating.
2. The invention adopts a scanning method (moving on the pipe wall and continuously detecting), and has high detection efficiency.
3. The present invention is less affected by the lift-off height (150mm or less).
4. The invention can detect high-temperature pipelines.
5. The invention does not need coupling agent in the detection process.
Drawings
FIG. 1 is a block diagram of the present invention.
FIG. 2 is a standard wall thickness fit graph.
FIG. 3 is a graph of the wall thickness results of a medium frequency electromagnetic measurement in accordance with a first embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
The system device comprises an intermediate frequency electromagnetic host (single channel), a sensor assembly with an incremental pedometer, a data processing terminal (PAD), a 6-core cable, a supporting accessory and the like. The feedback signal received by the host is transmitted to a data processing terminal (PAD) by Bluetooth.
The medium-frequency electromagnetic host is connected with the sensor assembly through a 6-core cable and is responsible for transmitting an excitation signal and receiving a feedback signal; and the data processing terminal (PAD) is responsible for acquiring detection feedback signals, analyzing and calculating the acquired signals by using algorithm software (stainless steel material special algorithm), and directly presenting a map of the stainless steel pipeline wall thickness scanning result on a screen.
The system utilizes a special algorithm aiming at stainless steel pipeline signal processing, realizes continuous scanning of the wall thickness of the stainless steel pipeline under the condition of no need of surface processing, is suitable for the detection requirements of different pipe diameters, and can realize quick scanning of corrosion defects in the stainless steel and semi-quantitative calculation of the severity of the defects at the temperature of 300 ℃. The step counting device in the system sensor can accurately determine the position of the corrosion defect, and quickly, directly and accurately position the corrosion defect in the stainless steel pipeline.
As shown in figure 1, the device system comprises a medium-frequency electromagnetic host, a sensor assembly with an incremental pedometer, a data processing terminal (PAD) and a 6-core cable.
The medium-frequency electromagnetic host mainly realizes the transmitting function and the signal acquisition function of electromagnetic signals.
The sensor assembly with the function of the incremental pedometer consists of a transmitting coil, a receiving coil and the incremental pedometer; when the stainless steel pipeline is detected, the sensor assembly is arranged on the smooth surface outside the pipeline, and the sensor assembly is continuously moved and used for continuously acquiring electromagnetic signals of a detection part. The sensor assembly has a step counting function and can realize the step length positioning function of the detection position.
The stainless steel sensor assembly is connected with the medium-frequency electromagnetic host through a 6-core cable.
The data processing terminal (PAD) comprises a feedback signal receiving function and a data processing function (through a specific algorithm, the calculation result of the stainless steel wall thickness of the scanned area is directly output in a map).
And the data processing terminal system (PAD) is connected with the intermediate-frequency electromagnetic host through Bluetooth.
A medium frequency electromagnetic measurement method and a device for scanning corrosion defects of a stainless steel pipe wall are disclosed, wherein the measurement method comprises the following steps:
step 1: selecting a proper sensor assembly according to the specific material, pipe diameter, heat-insulating layer thickness and the like of the stainless steel pipeline to be detected;
step 2: and (3) selecting a proper electromagnetic signal according to the specific material, wall thickness and heat insulation layer thickness of the stainless steel pipeline to be detected and the sensor assembly selected in the step (1). The transmission frequency of the electromagnetic signal is selected between 16HZ and 32HZ, and the transmission voltage value of the electromagnetic signal is selected between 1V and 10V;
and step 3: and (3) placing the sensor assembly selected in the step (1) on the outer surface of the stainless steel pipeline to be detected (or the outer surface of the heat insulation layer), and sending the electromagnetic signal selected in the step (2) by adopting a medium-frequency electromagnetic host. And continuously moving the sensor assembly, and acquiring detection signals covered by a scanning area of the sensor assembly. The detection signal comprises an induced voltage value and a step-counting positioning value which are generated in the transmission process of the electromagnetic signal and attenuate along with time;
and 4, step 4: the detection signal in the step 2 is transmitted to a data processing terminal through the intermediate frequency electromagnetic host through Bluetooth;
and 5: the data processing terminal performs batch processing on data and extracts characteristic values related to wall thickness, and the method comprises the following steps:
step 5.1: each piece of preprocessed detection position data received by the data processing terminal comprises 20-31 time windows distributed according to time (each time window comprises response time T and a corresponding induced voltage value V/A, A is emission current), and the first 0-5 time windows (magnetic saturation regions) are removed;
step 5.2: calculating the lg (induced voltage V/A) and lg (response time T) of each residual time window;
step 5.3: calculating the slope K value (first derivative) of four adjacent time windows 'lg (response time T) and lg (induced voltage V/A)', and four-point fitting straight lines;
step 5.4: comparing the slope K values obtained in step 5.3, and selecting the maximum K value Kmax；
Step 5.5: selecting KmaxCorresponding to the time window, and simultaneously selecting the data of the time window and the data of the first three time windows as a selection interval;
step 5.5: calculating the 'response time T, lg (induced voltage V/A)' of four time windows in the selection interval to fit the slope of a four-point straight line, and solving the absolute value of the slope, wherein the absolute value of the slope is the characteristic value S.
Step 6: calculating the wall thickness value of the stainless steel by using the characteristic value S obtained in the step 5, wherein the steps comprise:
step 6.1: measuring standard test blocks (4mm, 6mm, 8mm, 10mm, 12mm, 16mm and 20mm, tolerance +/-0.05 mm) with different wall thicknesses to obtain a group of characteristic value groups (S4, S6, S8, S10, S12, S16 and S20) corresponding to known wall thickness values, wherein the standard test blocks are sample plates with different standard wall thicknesses, for example, the 2mm standard test block is a sample plate with a standard wall thickness of 2mm, and the process of obtaining the characteristic values is the same as the step 5;
step 6.2: fitting the known wall thickness value and the characteristic value group in the step 6.1 to obtain a relation between the wall thickness and the characteristic value;
step 6.3: and (4) substituting the characteristic value of the actual unknown wall thickness obtained in the step 5.5 into the relational expression in the step 6.2 to obtain the actual unknown wall thickness value of the corresponding position.
And 7: and (4) obtaining the wall thickness value of a certain point of the pipeline to be measured by using an ultrasonic thickness gauge, and comparing the wall thickness value with the wall thickness value obtained in the step 6.3 to obtain a calibration coefficient.
And 8: and (4) multiplying the wall thickness value obtained in the step 6.3 by the calibration coefficient obtained in the step 7 to obtain a calibrated wall thickness value.
And step 9: and displaying the detection position and the real-time imaging result of the wall thickness value obtained in the step 8.
Examples
1. Obtaining the relation between wall thickness and characteristic value
1.1, selecting a stainless steel sensor assembly, selecting 16HZ and 5V of frequency and voltage of an electromagnetic signal generated by a medium-frequency electromagnetic instrument;
1.2, respectively placing the sensor assembly on the surfaces of standard 304 stainless steel test blocks of 4mm, 6mm, 8mm, 10mm, 12mm, 16mm and 20mm, and carrying out fixed-point measurement to obtain characteristic values which are respectively as follows: s4-3.75, S4-2.48, S8-1.93, S10-1.55, S12-1.24, S16-0.97, and S20-0.79.
And 1.3, fitting the seven groups of standard wall thickness values with corresponding characteristic values to obtain a relation between the wall thickness and the characteristic values, as shown in FIG. 2.
1.4, the relationship between the wall thickness of the 304 stainless steel and the characteristic value is as follows: D15.47S-1.027Wherein D is the wall thickness and S is the characteristic value.
2. A certain chemical plant inlet pipeline, the external diameter is 219mm, and the wall thickness is 4.8mm, and the material is 304 stainless steel, and operating temperature is 35 ℃, and pipeline length is 1 meter, and detection area 0.8 meter detects according to the step:
2.1, selecting a stainless steel sensor assembly, wherein the frequency of a generated electromagnetic signal is 16HZ, and the voltage is selected to be 5V;
2.2, placing the sensor assembly on the outer surface of the pipeline, controlling the medium-frequency electromagnetic generation system to send out an electromagnetic signal by using the data processing terminal, and gently moving the sensor assembly along the to-be-detected area of the pipeline until the detection area of 0.8m is finished;
2.3, displaying a real-time image of the detection position and the corresponding wall thickness on a display screen of the data processing terminal;
2.4, scanning the wall thickness image of the pipeline section as shown in figure 3.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto. Any person skilled in the art can substitute or change the technical solution of the present invention and its inventive concept within the technical scope of the present invention, and all the equivalents or changes thereof are covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides a sweep and examine nonrust steel pipe wall corrosion defect's intermediate frequency electromagnetic measurement device which characterized in that includes:
the medium-frequency electromagnetic host is used for transmitting electromagnetic signals to the sensing line assembly;
the sensor assembly is used for acquiring a detection signal of a detection part of the stainless steel pipeline to be detected and sending the detection signal to the data processing terminal through the medium-frequency electromagnetic host;
and the data processing terminal is used for processing the detection signal, extracting a characteristic value of the wall thickness of the stainless steel pipeline in the detection signal and displaying a real-time imaging result of the wall thickness value of the stainless steel pipeline.
2. The medium-frequency electromagnetic measurement device for scanning the corrosion defects of the wall of the stainless steel pipe according to claim 1, wherein the sensor assembly consists of a transmitting coil, a receiving coil and an incremental pedometer, is arranged on the outer surface of the stainless steel pipe and can move continuously; the sensor assembly has a step counting function and is used for positioning a detection position.
3. The medium-frequency electromagnetic measurement device for scanning the corrosion defects of the stainless steel pipe wall according to claim 1, wherein the medium-frequency electromagnetic host is connected with the sensor assembly through a cable; the intermediate frequency electromagnetic host is in wireless connection with the data processing terminal through Bluetooth.
4. A medium-frequency electromagnetic measurement method for scanning corrosion defects of a stainless steel pipe wall is characterized by comprising the following steps:
1) placing a sensor assembly on the outer surface of a stainless steel pipeline to be detected, and sending an electromagnetic signal by using a medium-frequency electromagnetic host; continuously moving the sensor assembly, and acquiring detection signals covered by a scanning area through the sensor assembly;
2) a detection signal acquired by the sensor assembly is filtered by the medium-frequency electromagnetic host and then transmitted to the data processing terminal through Bluetooth;
3) the data processing terminal processes the processed detection signals and extracts characteristic values in the detection signals;
4) calculating the wall thickness value of the stainless steel pipeline by using the characteristic value;
5) measuring the wall thickness value of a certain point of the stainless steel pipeline to be measured by using an ultrasonic thickness gauge, and comparing the wall thickness value with the wall thickness value of the stainless steel pipeline calculated in the step 4) to obtain a calibration coefficient;
6) multiplying the wall thickness value of the stainless steel pipeline obtained in the step 4) by the calibration coefficient obtained in the step 5) to obtain a calibrated wall thickness value of the stainless steel pipeline;
7) and the data processing terminal displays the detection position and the real-time imaging result of the wall thickness value of the stainless steel pipeline obtained in the step 6).
5. The method of claim 4, wherein the transmission frequency of the electromagnetic signal from the medium frequency electromagnetic mainframe is between 16Hz and 32Hz, and the transmission voltage of the electromagnetic signal is between 1V and 10V.
6. The method as claimed in claim 4, wherein the detection signal comprises an induced voltage value and a step-counting positioning value which are generated in the transmission process of the electromagnetic signal and decay with time.
7. The medium-frequency electromagnetic measurement method for scanning the corrosion defects of the stainless steel pipe wall according to claim 4, wherein the step 3) is specifically as follows:
3.1) the data processing terminal receives each processed detection position time window data sent and sent by the medium-frequency electromagnetic host: removing the first 0-5 time windows according to 20-31 time windows distributed in time, namely removing the magnetic saturation area;
3.2) calculating the 'lg (induced voltage V) and lg (response time T)' of each residual time window;
3.3) calculating the slope K value of four-point fitting straight lines of four adjacent time windows 'lg (response time T) and lg (induced voltage V)';
3.4) comparing the slope K values calculated in the step 3.3), and selecting a maximum K value Kmax;
3.5) selecting a time window corresponding to Kmax, and simultaneously selecting data of the time window and the first three time windows as a selection interval;
3.6) calculating the 'response time T, lg (induced voltage V)' of four time windows in the selection interval to fit the slope of a four-point straight line, and solving the absolute value of the slope, wherein the absolute value of the slope is the characteristic value S.
8. The method of claim 7, wherein each time window comprises a response time T and a corresponding induced voltage value V.
9. The medium-frequency electromagnetic measurement method for scanning the corrosion defects of the stainless steel pipe wall according to claim 4, wherein the step 4) is specifically as follows:
4.1) measuring the standard test blocks with different wall thicknesses to obtain a group of characteristic value groups corresponding to known wall thickness values;
4.2) fitting the known wall thickness value and the characteristic value set in the step 4.1) to obtain a relational expression of the wall thickness and the characteristic value of the stainless steel pipeline;
4.3) substituting the characteristic value of the actual unknown wall thickness obtained in the step 3.6) into the relational expression in the step 4.2) to obtain the actual unknown wall thickness value of the corresponding position.
10. The medium-frequency electromagnetic measurement method for scanning the corrosion defects of the wall of the stainless steel pipe according to claim 9, wherein the relation between the wall thickness of the stainless steel pipe and the characteristic value is as follows:
D＝R*SB，
where D is the stainless steel pipeline wall thickness, S is the characteristic value, and R, B is a constant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010298781.2A CN111337565A (en) | 2020-04-16 | 2020-04-16 | Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010298781.2A CN111337565A (en) | 2020-04-16 | 2020-04-16 | Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111337565A true CN111337565A (en) | 2020-06-26 |
Family
ID=71184804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010298781.2A Pending CN111337565A (en) | 2020-04-16 | 2020-04-16 | Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111337565A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173911A (en) * | 2007-10-17 | 2008-05-07 | 中国人民解放军海军工程大学 | Fast checking method for pipe defect and nondestructive testing apparatus |
| CN103512483A (en) * | 2012-06-30 | 2014-01-15 | 中国石油化工股份有限公司 | Overhead pipe wall thickness corrosion scanning and detecting system |
| CN107402254A (en) * | 2017-09-25 | 2017-11-28 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline checking method and device |
| CN207366505U (en) * | 2017-09-25 | 2018-05-15 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline scanning equipment |
| CN105509631B (en) * | 2015-12-07 | 2018-05-18 | 天津因科新创科技有限公司 | A kind of impulse eddy current method for testing wall thickness and device |
| CN109932419A (en) * | 2019-02-11 | 2019-06-25 | 中国石油天然气股份有限公司 | A kind of crude oil pipeline internal corrosion detection device and its method |
-
2020
- 2020-04-16 CN CN202010298781.2A patent/CN111337565A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173911A (en) * | 2007-10-17 | 2008-05-07 | 中国人民解放军海军工程大学 | Fast checking method for pipe defect and nondestructive testing apparatus |
| CN103512483A (en) * | 2012-06-30 | 2014-01-15 | 中国石油化工股份有限公司 | Overhead pipe wall thickness corrosion scanning and detecting system |
| CN105509631B (en) * | 2015-12-07 | 2018-05-18 | 天津因科新创科技有限公司 | A kind of impulse eddy current method for testing wall thickness and device |
| CN107402254A (en) * | 2017-09-25 | 2017-11-28 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline checking method and device |
| CN207366505U (en) * | 2017-09-25 | 2018-05-15 | 天津特米斯科技有限公司 | A kind of transient electromagnetic defect of pipeline scanning equipment |
| CN109932419A (en) * | 2019-02-11 | 2019-06-25 | 中国石油天然气股份有限公司 | A kind of crude oil pipeline internal corrosion detection device and its method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8820163B2 (en) | Nondestructive inspection apparatus and nondestructive inspection method using guided wave | |
| CN206208832U (en) | A kind of coiled tubing on-line measuring device | |
| KR20090042500A (en) | Ultrasonic highi-temp tube inspection and thickness measuring apparatus | |
| CN105509631A (en) | Pulsed eddy current wall thickness detection method and device | |
| CN117235433B (en) | Metal surface crack quantitative evaluation method based on alternating current magnetic field | |
| CN111337565A (en) | Medium-frequency electromagnetic measurement method and device for scanning corrosion defects of stainless steel pipe wall | |
| CN213022972U (en) | Ferromagnetic material wall thickness defect scanning device | |
| WO2007132509A1 (en) | Ultrasonic inspection method utilizing resonant phenomena | |
| CN107178710B (en) | It is a kind of based on it is inside and outside detection signal characteristic abstraction defect of pipeline inside and outside discrimination method | |
| CN110632167A (en) | Online detection method for chemical pipeline | |
| CN111678977A (en) | Ferromagnetic material wall thickness defect scanning device and method | |
| CN115451800A (en) | Testing method of portable field testing imager for cement electric pole | |
| CN112946065B (en) | Pulse eddy current detection method and device based on late signal slope | |
| KR101210472B1 (en) | Apparatus and method for detecting the micro-scale crack using nonlinear characteristics of ultrasonic resonance | |
| CN111829424B (en) | Device and method for quantitatively detecting oxide accumulation in austenitic stainless steel tube of boiler | |
| CN212179841U (en) | Instrument device for detecting thickness of carbon deposition layer of smoke exhaust pipe | |
| CN209541610U (en) | Auxiliary tool is used in a kind of in-service roller detection | |
| CN106885849A (en) | A kind of multi-point sampler method for removing of pipe ultrasonic Guided waves spurious echo | |
| CN102478496A (en) | Method for accurate measurement of polarization resistance of corrosion system and special tester | |
| CN109916997A (en) | A kind of petroleum pipeline on-line measuring device | |
| US20180196013A1 (en) | Tracking defects with permanently installed sensors | |
| CN111521679A (en) | Flaw detection method for steel structure | |
| CN114659439A (en) | Novel pulse eddy current thickness measuring device and method | |
| JP4118487B2 (en) | Steel pipe corrosion diagnosis method | |
| CN116558675B (en) | Alternating electromagnetic field stress detection signal processing method and device considering lift-off effect |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |