CN213275439U - Calibration pipe for magnetic measurement of oxide accumulation - Google Patents
Calibration pipe for magnetic measurement of oxide accumulation Download PDFInfo
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- CN213275439U CN213275439U CN202022412728.9U CN202022412728U CN213275439U CN 213275439 U CN213275439 U CN 213275439U CN 202022412728 U CN202022412728 U CN 202022412728U CN 213275439 U CN213275439 U CN 213275439U
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Abstract
The utility model discloses a calibration pipe is piled up to magnetism measurement oxide, including calibration pipe body, bottom head, threaded end cover and ladder test block, wherein, the ladder test block is located calibration pipe originally internally, and the bottom head is fixed in the bottom opening part of calibration pipe body, and the threaded end cover is fixed in the open-top department of calibration pipe body, and gapped between the tip of ladder test block and the threaded end cover, and calibration pipe body intussuseption is filled with oxide, and this calibration pipe can pipeline inside oxide pile up the area and block up the degree and accurately detect, and detection efficiency is higher.
Description
Technical Field
The utility model belongs to the technical field of nondestructive test, a calibration pipe is piled up to magnetism measurement oxide is related to.
Background
Austenitic stainless steel is widely used in recent years in boiler high-temperature heating surface parts of (supercritical) thermal power generating units at home and abroad due to good ductility, weldability, structural stability, high temperature resistance, steam corrosion resistance and higher heat strength. At present, the austenitic stainless steel materials commonly used in domestic boilers are mainly provided with the brands of TP304H, TP347H, TP347HFG, SUPER304H, HR3C and the like. Because the inner wall of the austenitic stainless steel high-temperature heating surface tube is easy to be oxidized at high temperature under the action of long-term high-temperature steam, the oxidation product contains a large amount of Fe3O4And a small amount of Fe2O3. The expansion coefficients of the oxidation products are greatly different from those of the austenitic matrix metal, the expansion and contraction deformation of the two products are inconsistent when the temperature is changed, larger stress is generated between the two products, when the stress value exceeds the tensile/compressive strength of the oxide scale attached to the inner wall and the bonding strength of the oxide scale and the metal matrix, the oxide scale is cracked and peeled off from the metal surface, and partial oxide scale is deposited at the lower elbow of the heating surface and near the lower elbow. The oxide is easy to be stripped from the metal body due to the violent sudden change of the operation condition. Especially, when the temperature changes repeatedly or violently, such as the start-stop process of the boiler and forced ventilation and rapid cooling during the furnace shutdown, the peeling of the oxides is accelerated. Steam flow in normal operation of a boiler usually cannot take away oxides with large sizes, so that oxide scales are accumulated below an elbow, and blockage and even overtemperature pipe explosion are caused.
At present, the traditional device for detecting the falling and accumulation of the oxides basically adopts a ray method and a magnetic detection method. The ray method and the device have the defects of high equipment cost, time consumption, low detection sensitivity, difficulty in identifying and determining the deposited oxides with small quantity from the image, and certain danger in the working process due to the harmfulness of a ray radioactive source. Therefore, the magnetic detection method has the advantages of cross operation, quick detection result obtaining and the like, is widely used at present, generally speaking, a material object pipeline is usually used for calibration in the magnetic method measurement process, firstly, oxides stacked in different quantities are poured into different material object pipelines respectively, the proportion of the stacked oxides occupied in the flow area of the pipeline is observed visually, and a relation curve of the measurement result of the oxides stacked in different quantities and the proportion occupied by the observation is recorded.
Therefore, a magnetic detection method and a test block for oxide deposits in austenitic stainless steel pipes are designed and developed to solve the problem that the detection result is affected by the difficulty in acquiring a material pipeline, the wall thickness of the pipeline, the aging degree, the density of an oxide stack and the visual accuracy in calibration when the butt joint condition of the oxides in the austenitic stainless steel pipes is measured by using a magnetic detection method, and improve the working efficiency.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome above-mentioned prior art's shortcoming, provide a calibration pipe is piled up to magnetism measurement oxide, this calibration pipe can pile up area, jam degree to the inside oxide of pipeline and carry out accurate detection, and detection efficiency is higher.
In order to achieve the above object, the magnetic measurement oxide pile up the calibration tube and include calibration tube body, bottom head, threaded end cap and ladder test block, wherein, the ladder test block is located the calibration tube originally internally, the bottom head is fixed in the bottom opening part of calibration tube body, the threaded end cap is fixed in the top opening part of calibration tube body, it is gapped between the tip of ladder test block and the threaded end cap, the internal oxide that is filled of calibration tube body.
The length of the calibration pipe body is 200mm, the outer diameter of the calibration pipe body is 32mm-60mm, and the wall thickness of the calibration pipe body is 4mm-12 mm.
The wall thickness of the calibration pipe body is 4mm, and the outer diameter of the calibration pipe body is 60 mm.
The ladder test block is of a four-stage ladder structure, the first-stage thickness of the ladder test block is 20mm, the second-stage thickness of the ladder test block is 32mm, the third-stage thickness of the ladder test block is 42mm, and the fourth-stage thickness of the ladder test block is 52 mm.
The ladder test block and the calibration pipe body are both transparent structures.
From the top opening of calibration pipe body to the bottom opening direction of calibration pipe body, the thickness of each ladder of ladder test block increases gradually.
The length of each ladder in the ladder test block is the same, and the width of each ladder in the ladder test block equals the internal diameter of calibration pipe body.
The calibration tube body and the step test block are both made of polymethyl methacrylate.
The magnetic conductivity of the calibration pipe body and the ladder test block is the same as that of the pipeline to be measured.
The utility model discloses following beneficial effect has:
magnetism measurement oxide pile up calibration pipe when concrete operation, through designing calibration pipe to the oxide that forms not equidimension blocks up regionally, in actual detection time measuring, blocks up regionally through the probe to the oxide of not equidimension and detects, with drawing different area and blockking up the relation curve than with the testing result, then utilize the probe to detect the pipeline that awaits measuring, and with the testing result with relation curve carries out the comparison, piles up area with accurate inside oxide of acquireing the pipeline that awaits measuring and blocks up the ratio, convenient operation, simple, detection efficiency is higher.
Drawings
Fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a graph plotting the clogging ratio of different areas versus the detection results.
Wherein, 1 is the calibration pipe body, 2 is the screw thread end cover, 3 is the ladder test block, 4 is the bottom head.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings:
refer to fig. 1, magnetism measure oxide pile up calibration pipe including calibration pipe body 1, bottom head 4, end cap 2 and ladder test block 3, wherein, ladder test block 3 is located calibration pipe body 1, bottom head 4 is fixed in calibration pipe body 1's bottom opening part, end cap 2 is fixed in calibration pipe body 1's top opening part, it is gapped between ladder test block 3's tip and the end cap 2, the intussuseption of calibration pipe body 1 is filled with oxide, the length l of each ladder is the same in the ladder test block 3, the width of each ladder equals the internal diameter of calibration pipe body 1 in ladder test block 3, ladder test block 3 and calibration pipe body 1 are transparent construction, from calibration pipe body 1's top opening to calibration pipe body 1's bottom opening direction, the thickness h of each ladder of ladder test block 3 increases gradually.
The length L of the calibration pipe body 1 is 200mm, the outer diameter phi of the calibration pipe body 1 is 32mm-60mm, and the wall thickness delta of the calibration pipe body 1 is 4mm-12 mm.
Specifically, the wall thickness of the calibration pipe body 1 is 4mm, and the outer diameter of the calibration pipe body 1 is 60 mm; the ladder test block 3 is of a four-level ladder structure, the first-level thickness of the ladder test block 3 is 20mm, the second-level thickness of the ladder test block 3 is 32mm, the third-level thickness of the ladder test block 3 is 42mm, and the fourth-level thickness of the ladder test block 3 is 52 mm.
The calibration pipe body 1 and the step test block 3 are both made of polymethyl methacrylate; the magnetic conductivity of the calibration pipe body 1 and the ladder test block 3 is the same as that of the pipeline to be measured.
The utility model discloses a concrete application process does:
1) the bottom opening of the calibration tube body 1 is closed by the bottom end socket 4, then the stepped test block 3 is put in, and then oxide is poured into the calibration tube to fill the whole calibration tube, as shown by shading in figure 1. The calibration pipe comprises a calibration pipe body 1, a stepped test block 3, a threaded end cover 2, a bottom seal head 4, a bottom seal head, a first oxide blocking area, a second oxide blocking area, a third oxide blocking area and a fourth oxide blocking area, wherein the stepped test block 3 is of a four-stage stepped structure, the bottom of the stepped test block 3 is in contact with the bottom seal head 4, the top opening of the calibration pipe body 1 is sealed through the threaded end cover 2, a space is reserved between the threaded end cover 2 and the stepped test block 3, and accordingly five areas are formed in the calibration pipe body 1, the first oxide blocking area is a 100% area blocking area formed between the stepped test block 3 and the threaded end cover 2, and the second oxide; the third is a second-stage oxide blocking area formed by a second-stage step of the step test block 3 and the inner wall of the calibration pipe body 1; the fourth is a third-stage oxide blocking area formed by a third-stage step of the step test block 3 and the inner wall of the calibration pipe body 1; the fifth step is a region with the area blockage ratio of 0 percent formed by the fourth step of the step test block 3 and the inner wall of the calibration pipe body 1; namely, the area clogging ratios of the respective regions were 100%, 50%, 40%, 20% and 0%, respectively.
2) Detecting each region by a probe, and drawing a relation curve of different area blockage ratios and detection results according to the detection results, as shown in FIG. 2;
3) detecting the pipeline to be detected through a probe, and comparing the detection result with the relation curve drawn in the step 2) to obtain the blockage ratio of the oxide accumulation area in the pipeline to be detected, thereby completing the magnetic detection of the oxide accumulation in the austenitic stainless steel pipe.
It should be noted that the wall thickness and the diameter of the pipe to be measured are the same as those of the calibration pipe body 1.
Claims (9)
1. The utility model provides a calibration pipe is piled up to magnetic measurement oxide, a serial communication port, including calibration pipe body (1), bottom head (4), threaded end cover (2) and ladder test block (3), wherein, ladder test block (3) are located calibration pipe body (1), bottom head (4) are fixed in the bottom opening part of calibration pipe body (1), threaded end cover (2) are fixed in the top opening part of calibration pipe body (1), it is gapped between tip and the threaded end cover (2) of ladder test block (3), calibration pipe body (1) intussuseption is filled with oxide.
2. The magnetically measured oxide buildup calibration tube according to claim 1, characterized in that the length of the calibration tube body (1) is 200mm, the outer diameter of the calibration tube body (1) is 32mm-60mm, and the wall thickness of the calibration tube body (1) is 4mm-12 mm.
3. The magnetically measured oxide buildup calibration tube according to claim 2, characterized in that the wall thickness of the calibration tube body (1) is 4mm and the outer diameter of the calibration tube body (1) is 60 mm.
4. The magnetic measurement oxide accumulation calibration tube according to claim 3, wherein the stepped test block (3) has a four-step structure, the first-step thickness of the stepped test block (3) is 20mm, the second-step thickness of the stepped test block (3) is 32mm, the third-step thickness of the stepped test block (3) is 42mm, and the fourth-step thickness of the stepped test block (3) is 52 mm.
5. The magnetic measurement oxide accumulation calibration tube according to claim 1, wherein the step test block (3) and the calibration tube body (1) are transparent structures.
6. The magnetic measurement oxide accumulation calibration tube as claimed in claim 1, wherein the thickness of each step of the step block (3) is gradually increased from the top opening of the calibration tube body (1) to the bottom opening of the calibration tube body (1).
7. The magnetic measurement oxide accumulation calibration tube as claimed in claim 1, wherein the length of each step in the step block (3) is the same, and the width of each step in the step block (3) is equal to the inner diameter of the calibration tube body (1).
8. The magnetic oxide accumulation calibration tube for measurement according to claim 1, wherein the calibration tube body (1) and the step block (3) are made of polymethyl methacrylate.
9. The magnetic measurement oxide accumulation calibration tube according to claim 1, wherein the magnetic permeability of the calibration tube body (1) and the step block (3) is the same as that of the pipe to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022412728.9U CN213275439U (en) | 2020-10-26 | 2020-10-26 | Calibration pipe for magnetic measurement of oxide accumulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022412728.9U CN213275439U (en) | 2020-10-26 | 2020-10-26 | Calibration pipe for magnetic measurement of oxide accumulation |
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| CN213275439U true CN213275439U (en) | 2021-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305062A (en) * | 2020-10-26 | 2021-02-02 | 西安热工研究院有限公司 | Calibration pipe and magnetic detection method for oxide deposits in austenitic stainless steel pipe |
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- 2020-10-26 CN CN202022412728.9U patent/CN213275439U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112305062A (en) * | 2020-10-26 | 2021-02-02 | 西安热工研究院有限公司 | Calibration pipe and magnetic detection method for oxide deposits in austenitic stainless steel pipe |
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