CN210465347U - Sensitivity calibration sample tube simultaneously used for detecting defects of ferromagnetic heat exchanger tube bundle by far-field eddy current and acoustic pulse - Google Patents
Sensitivity calibration sample tube simultaneously used for detecting defects of ferromagnetic heat exchanger tube bundle by far-field eddy current and acoustic pulse Download PDFInfo
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- CN210465347U CN210465347U CN201921199104.4U CN201921199104U CN210465347U CN 210465347 U CN210465347 U CN 210465347U CN 201921199104 U CN201921199104 U CN 201921199104U CN 210465347 U CN210465347 U CN 210465347U
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- 230000007547 defect Effects 0.000 title claims abstract description 83
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- 230000005294 ferromagnetic effect Effects 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 43
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 5
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 8
- 239000000523 sample Substances 0.000 description 6
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- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
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Abstract
The utility model relates to a sensitivity that is used for far field vortex and acoustic pulse to detect ferromagnetic heat exchanger tube bank defect simultaneously marks appearance pipe belongs to the pipeline nondestructive test field. The two ends of the cylindrical pipe body are respectively provided with a radial through hole I and a radial through hole II for detecting artificial defects through acoustic emission, the aperture of the through hole I is smaller than that of the through hole II, the hole distance between the through hole I and the through hole II is not smaller than 1m, and a far-field eddy defect round bottom hole, a far-field eddy defect through hole, a far-field eddy defect circumferential narrow groove, a far-field eddy defect circumferential wide groove and a far-field eddy defect circumferential groove are sequentially arranged between the through hole I and the through hole II of the cylindrical pipe body; the advantage is novel structure, combines far field eddy current testing technique and acoustic pulse detection technique, produces the defect that satisfies far field eddy current testing promptly, satisfies the acoustic pulse and detects the requirement again on same sensitivity calibration sample pipe, makes it can be applied to far field eddy current testing and acoustic pulse simultaneously and detects, is fit for the multi-channel quick measurement.
Description
Technical Field
The utility model belongs to the pipeline nondestructive test field especially relates to a sensitivity that is used for far field vortex and acoustic pulse to detect ferromagnetic heat exchanger tube bank defect simultaneously marks appearance pipe.
Background
The heat exchanger tube bundle is widely applied to the industries of petroleum, chemical engineering, electric power and the like. Frequent leakage of heat exchanger tube bundles in industries such as petroleum, chemical industry, electric power and the like causes production halt, thereby not only causing economic loss of enterprises, but also even threatening the life safety of field workers. Due to various defects of the heat exchanger tube bundle in the processes of manufacturing, installation, service and the like, potential safety hazards are brought to a pipeline transportation system, and the pipeline frequently leaks to cause unplanned production halt, so that huge economic loss of enterprises is caused, and even the life safety of field workers is threatened. Therefore, the nondestructive testing technology or equipment for the service pipeline can be quickly and effectively carried out, and people pay attention to the technology or equipment.
The conventional nondestructive detection method for the tube bundle of the ferromagnetic heat exchanger at present is a far-field eddy current detection technology and an acoustic pulse detection technology; wherein:
(1) acoustic pulse detection:
when needs acoustic pulse detection, with the probe right side insert in being detected intraductal, press "acoustic pulse detection" button on the probe, the acoustic pulse is detecting the wave form sketch map, high frequency loudspeaker send a cluster excitation pulse wave along the pipeline propagation in-process, when meetting hindrance or defect, can produce the reflection echo, audio sensor acquires this echo signal, send analytic system and show the waveform after frequency-selecting filtering processing, the penetrability defect is if hole and the crackle that runs through the pipe wall, the echo signal phase place is first negative back positive: obstructive defects including pits, blockages, tube deformation, etc., the phase of the echo signal is positive and negative.
(2) And (3) far-field eddy current detection:
the eddy current test is a nondestructive test method based on the electromagnetic induction principle, and is suitable for conductive materials. When a conductor is placed in an alternating magnetic field, an induced current exists in the conductor, i.e., eddy currents are generated. The detection method for determining the properties and the state of the conductor by utilizing the phenomenon that the eddy current changes due to the change of various factors (such as conductivity, permeability, shape, size, defects and the like) of the conductor is called eddy current detection.
The detection principle is as follows: the principle by which far field eddy current technology works is to detect changes in the alternating electromagnetic field emitted by the sensor. The electromagnetic field is sent by the sensor to act on the metal pipeline and is enhanced at the place with metal loss, and the electromagnetic field is received by the receiving sensor, converted by the analog-to-digital converter and processed by the digital processor. The detection data is stored in the detector.
The advantages of far-field eddy current detection are as follows:
1. and (4) non-contact nondestructive detection. The far field vortices do not need to be in full contact with the tube wall.
2. Far field eddy current detectors can be used for lines with varying inner diameters and sharply curved lines (e.g., tees) because of the small outer diameter and flexible design of the detector.
3. Far field eddy current detectors can detect stress concentrations from outside the pipeline (e.g. dents or rock impacts).
4. The far field eddy current detector is in "soft contact" with the pipeline, which prevents damage to the inner wall of the pipeline.
5. The phase and amplitude changes of the electromagnetic field are detected by the far-field eddy current detection, so that the accuracy of the detection depth and the sensitivity to the wall thickness change of the pipeline are improved.
6. The bi-directional design of the detector allows the detector to feed and retrieve balls from the same nozzle.
7. The far-field vortex detector has strong bearing capacity, and the carried sensor is not easy to damage.
Through the analysis, the far-field eddy current detection efficiency is high; the detection speed is high and 100% of detection is realized; the sensitivity to corrosion type defects is high. But far-field eddy currents have relatively low detection sensitivity for plugging type defects and perforation type defects in the pipe. In addition, the direct application of the far-field eddy current technology to the heat exchanger tube bundle detection still has some problems, for example, the defects of the outer wall and the inner part of the tube cannot be distinguished, and the blind areas existing near the tube blockage and the tube plate cannot be detected. The acoustic pulse detection technology has higher detection sensitivity for the blockage type defects and the perforation type defects in the pipe, has the advantages of long detection distance, large detection coverage, high detection speed, no influence of pipe materials and the like, can make up for the defects of far-field eddy current, is not sensitive to internal corrosion and cannot detect the external corrosion of the pipeline,
according to related standards, the ferromagnetic heat exchanger tube for far-field eddy current detection and acoustic pulse detection has different defect types and sensitivities, so that if the two technologies are combined, a defect meeting the requirements of the far-field eddy current detection and the acoustic pulse detection needs to be designed on one sensitivity calibration sample tube.
Disclosure of Invention
The utility model provides a sensitivity that is used for far field vortex and acoustic pulse to detect ferromagnetic heat exchanger tube bank defect simultaneously marks appearance pipe to solve and not satisfying far field vortex detection and acoustic pulse simultaneously and measuring the problem that requires the defect on the appearance pipe at sensitivity mark at present.
The utility model adopts the technical proposal that: the two ends of the cylindrical pipe body are respectively provided with a radial through hole I and a radial through hole II for detecting artificial defects through acoustic emission, the aperture of the through hole I is smaller than that of the through hole II, the hole distance between the through hole I and the through hole II is not smaller than 1m, the distance from the through hole I to the left end of the cylindrical pipe body is not smaller than 0.3m, and the distance from the through hole II to the right end of the cylindrical pipe body is not smaller than 0.3 m; a far-field eddy defect round bottom hole, a far-field eddy defect through hole, a far-field eddy defect circumferential narrow groove, a far-field eddy defect circumferential wide groove and a far-field eddy defect circumferential groove are sequentially arranged between the through hole I and the through hole II of the cylindrical pipe body;
the wall thickness of the cylindrical pipe body is 1-2 mm;
when the inner diameter of the cylindrical pipe body is smaller than or equal to 25mm, the aperture of the first through hole is 1mm, and the aperture of the second through hole is 2 mm;
when the inner diameter of the cylindrical pipe body is larger than 25mm and smaller than or equal to 50mm, the aperture of the first through hole is 2mm, and the aperture of the second through hole is 3 mm;
the depth of the far-field eddy current defect round-bottom hole is 50% of the wall thickness, and the diameter of the top opening is 10 mm;
the diameter of the far-field eddy defect through hole is 11.25 times of the wall thickness;
the depth of the far-field eddy current defect circumferential narrow groove is 20% of the wall thickness, the width of the groove is 3mm, and the length of the circumferential groove is half of the circumference of the pipe body;
the groove depth of the far-field eddy current defect circumferential wide groove is 20% of the wall thickness, the groove width is more than or equal to 2 times of the inner diameter of the pipe, and the circumferential groove length is half of the circumferential length of the pipe body;
the groove depth of the far-field eddy current defect circumferential groove is 60% of the wall thickness, the groove width is 15mm, and the circumferential groove length is 25% of the circumferential length of the pipe body.
The utility model has the advantages that novel structure combines far field eddy current testing technique and acoustic pulse detection technique, produces the defect that satisfies far field eddy current testing promptly, satisfies the acoustic pulse detection requirement again on same sensitivity marks the appearance pipe, makes it can be applied to far field eddy current testing and acoustic pulse simultaneously and detects, is fit for the multitube way quick measurement, but wide application in the heat exchanger tube bundle way short-term test in fields such as oil, chemical industry, electric power, steel factory.
Drawings
Fig. 1 is a schematic structural diagram of the present invention;
fig. 2 is a schematic cross-sectional view of the present invention.
Detailed Description
Referring to fig. 1 and 2, it should be noted that, in order to clearly express the structures of the present invention, such as thin wall, slender structure, small hole, etc., the schematic drawings are adopted for the related structures, not the actual product scale, and the above schematic expression does not affect the understanding of the present invention.
The two ends of the cylindrical pipe body 1 are respectively provided with a radial through hole I2 and a radial through hole II 3 for detecting artificial defects through acoustic emission, the aperture of the through hole I2 is smaller than that of the through hole II 3, the hole distance between the through hole I2 and the through hole II 3 is not smaller than 1m, the distance from the through hole I2 to the left end of the cylindrical pipe body 1 is not smaller than 0.3m, and the distance from the through hole II 3 to the right end of the cylindrical pipe body 1 is not smaller than 0.3 m; a far-field eddy defect round bottom hole 4, a far-field eddy defect through hole 5, a far-field eddy defect circumferential narrow groove 6, a far-field eddy defect circumferential wide groove 7 and a far-field eddy defect circumferential groove 8 are sequentially arranged between a first through hole 2 and a second through hole 3 of the cylindrical pipe body 1;
the wall thickness of the cylindrical pipe body 1 is 1-2 mm;
when the inner diameter of the cylindrical pipe body 1 is smaller than or equal to 25mm, the aperture of the first through hole 2 is 1mm, and the aperture of the second through hole 3 is 2 mm;
when the inner diameter of the cylindrical pipe body 1 is larger than 25mm and smaller than or equal to 50mm, the aperture of the first through hole 2 is 2mm, and the aperture of the second through hole 3 is 3 mm;
the depth of the far-field eddy defect round bottom hole 4 is 50% of the wall thickness, and the diameter of the top opening is 10 mm;
the diameter of the far-field eddy defect through hole 5 is 11.25 times of the wall thickness;
the depth of the far-field eddy current defect circumferential narrow groove 6 is 20% of the wall thickness, the width of the groove is 3mm, and the length of the circumferential groove is half of the circumference of the pipe body 1;
the groove depth of the far-field eddy current defect circumferential wide groove 7 is 20% of the wall thickness, the groove width is more than or equal to 2 times of the inner diameter of the pipe, and the circumferential groove length is half of the circumferential length of the pipe body 1;
the groove depth of the far-field eddy current defect circumferential groove 8 is 60% of the wall thickness, the groove width is 15mm, and the circumferential groove length is 25% of the circumference of the pipe body 1.
The working principle is as follows:
detecting the defects of the first through hole 2 and the second through hole 3 by using an acoustic pulse detector to detect the defects of the artificial defect through hole 2 and the artificial defect through hole 3 by using acoustic emission on the sample tube, adjusting equipment parameters to enable the acoustic pulse detector to detect the defects of the first through hole 2 and the second through hole 3, and storing related parameters, wherein the sensitivity is high;
the method comprises the steps of carrying out defect detection on a far-field eddy current defect round bottom hole 4, a far-field eddy current defect through hole 5, a far-field eddy current defect circumferential narrow groove 6, a far-field eddy current defect circumferential wide groove 7 and a far-field eddy current defect circumferential groove 8 on a sample tube by using a far-field eddy current detection instrument, and adjusting equipment parameters to enable the far-field eddy current detection equipment to detect corresponding defects, and is high in sensitivity and relevant parameters are stored.
In the subsequent work, the pipe to be detected on the site is detected by using the relevant parameters of the two devices.
Claims (9)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921199104.4U CN210465347U (en) | 2019-07-26 | 2019-07-26 | Sensitivity calibration sample tube simultaneously used for detecting defects of ferromagnetic heat exchanger tube bundle by far-field eddy current and acoustic pulse |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921199104.4U CN210465347U (en) | 2019-07-26 | 2019-07-26 | Sensitivity calibration sample tube simultaneously used for detecting defects of ferromagnetic heat exchanger tube bundle by far-field eddy current and acoustic pulse |
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| CN210465347U true CN210465347U (en) | 2020-05-05 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308209A (en) * | 2019-07-26 | 2019-10-08 | 吉林省电力科学研究院有限公司 | Sensitivity calibration sample tube for far-field eddy current and acoustic pulse detection of tube bundle defects in ferromagnetic heat exchangers |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110308209A (en) * | 2019-07-26 | 2019-10-08 | 吉林省电力科学研究院有限公司 | Sensitivity calibration sample tube for far-field eddy current and acoustic pulse detection of tube bundle defects in ferromagnetic heat exchangers |
| CN110308209B (en) * | 2019-07-26 | 2024-11-05 | 吉林省电力科学研究院有限公司 | Sensitivity calibration sample tube for remote field eddy current and acoustic pulse detection of ferromagnetic heat exchanger tube defects |
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