CN107121496A - A kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system and method - Google Patents
A kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system and method Download PDFInfo
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Abstract
The invention discloses a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system and method, belong to field of non destructive testing.Based on immersion type ultrasonic scanning system, immersion type ultrasound detection corrosion evaluation system is built；Setting pumping signal and reception signal relevant parameter, observe the time domain waveform signal received by oscillograph and corresponding excitation and reception signal parameter are finely adjusted respectively；Complete after parameter setting and selected testing conditions, immersion type ultrasonic scanning has been carried out to detection test specimen, and store detection data.The plate test coupon characteristic value data obtained according to ultrasound detection, zoning segmentation threshold and standard class character pair value；The characteristic value of each location point and the diversity factor of standard class are calculated respectively, and the corrosion class to each location point is evaluated；Finally, according to requirement of actual working condition, the weight ratio of corroded area and depth is determined, the corrosion class of whole test specimen is calculated, the corrosion class evaluation for plate structural test piece is realized.
Description
Technical field
The present invention relates to a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation method, particularly for Large Atmosphere Pressure
A kind of evaluation algorithms of storage tank bottom plate corrosion, belong to field of non destructive testing.
Background technology
Atmospheric storage tank is the important component of petrochemical equipment and storing and transporting system, big with volume, and distribution is concentrated, and can be stored
The features such as inflammable, explosive, poisonous medium.During the use of atmospheric storage tank, due to the pressure of bearing medium, temperature and outer
The joint effect of boundary's environmental factor, storage tank can produce the number of drawbacks such as burn into crackle, and wherein bottom corrosion is to cause atmospheric storage tank
One of main reason of failure.When storage tank leaks, environmental pollution is not only resulted in, and fire disaster may be led to
And explosion accident, the economic loss that can not be retrieved and severe social influence are brought to enterprise.Therefore, storage tank bottom plate corrosion is carried out
Detection and the research work of security evaluation are very necessary.
For bottom corrosion, conventional lossless detection method mainly has：Magnetic testing, Magnetic Flux Leakage Inspecting, Liquid penetrant testing and ultrasound
Detection.Magnetic testing is that magnetic forms visual visible magnetic trace in fault location, so as to show defect by magnetizing storage tank bottom
Information, the method detection is rapid, it is high to be pointed to the flaw detection sensitivity on surface, but can only detect near surface flaw.Leakage field is examined
Measuring tool has the advantages that easy to operate, detection efficiency is high, precision is high, but it can only judge defect state roughly and deep defects are examined
Go out effect poor.Liquid penetrant testing can realize the disposable complete detection for complex-shaped defect, and it is limited in that, detect program
It is cumbersome, it can not be measured for inner defect or closed surface defect, and detected material surface smoothness is required.Ultrasound inspection
Survey method is simple to operate, characterization processes are ripe, but it can not intuitively reflect the corrosion condition of detection zone.In above-mentioned detection method,
Magnetic testing, Liquid penetrant testing and Magnetic Flux Leakage Inspecting are required to can opening progress, and an expense is carried out within every 6 years according to relevant regulations storage tank
Higher cut out test, longer detection cycle exacerbates storage tank safe handling risk.
Detecting, it is necessary to just can tentatively understand the one of tank bottom corrosion condition using without can opening for storage tank bottom plate for this
Plant Non-Destructive Testing strategy；By the preliminary assessment result for storage tank degree of injury, more effective detection mode is further selected.
It on the basis of can opening testing cost is reduced, can also shorten the detection cycle of pipeline, realize the in-service maintenance of storage tank.Therefore,
The present invention has developed a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation method, realizes the corrosion for storage tank bottom plate
Damage carries out early stage assessment, improves detection efficiency, reduction testing cost.
For structure erosion evaluation method, domestic scholars have carried out substantial amounts of research.Xi'an Petroleum University's mechanical engineering
Institute proposes the oil-gas pipeline Evaluation of Internal Corrosion Degree method based on information fusion.By to a large amount of processing parameters, corrosivity physics
Chemical parameters carry out multi-level, many-sided, multi-level processing, corrosion evaluation information of equal value are translated into, to realize to corruption
Lose the evaluation of safety and anticorrosion ability.
Number of patent application：201410602563.8, a kind of oil tank bottom plate corrosion risk quantitative evaluation method.This method can
The corrosion leakage risk index of oil tank bottom plate is detected, but needs to be grasped a large amount of relevant parameters of detected storage tank, it is detailed for lacking
The old storage tank of real data realizes that the difficulty of risk profile is larger.Southwest Petroleum Institute analogy west is high etc. to be proposed based on fuzzy synthesis
The filling pipe corrosion evaluation method of judge, but this method Consideration is numerous, is not suitable for ultrasound detection Corrosion protection grade.
Chongqing University of Technology proposes the structure erosion grade evaluation method based on color of image, and this method is empty using RGB
Between the color of structure erosion characteristic image is described, realize structure erosion quantitative evaluation by image Segmentation Technology.This
Method is by obtaining the image of detection zone, quantitative analysis corrosion condition；But it is difficult directly to obtain rotten in tank floor inspection
The image in region is lost, but the situation of corrosion area is characterized by obtaining the form of location point ultrasound data.
The detection data that conventional ultrasound detection is obtained can not intuitively reflect the corrosion condition of detection zone and realize rotten
Lose the evaluation of grade；And the method for existing structure corrosion evaluation is a lot of in SC service ceiling condition, ultrasonic inspection is not particularly suited for
Survey the evaluation of corrosion.
In summary, on the Research foundation of forefathers, the deficiency existed for the existing detection method of plate structure erosion, this is specially
Profit proposes a kind of hardened structure corrosion evaluation algorithm based on ultrasound detection data.The algorithm can be realized for plate structure erosion
Grade is evaluated, and is estimated in particular for storage tank bottom plate extent of corrosion, is safe operation and the life-span of Technique for Large Atmospheric Storage Tanks
Prediction provides reliable reference information.
The content of the invention
The present invention has developed a kind of immersion type ultrasound detection with hardened structure corrosion class evaluation method, in particular for storage tank
Corrosion of base plate degree is estimated.This method mainly includes：Threshold segmentation, characteristic value diversity factor are calculated and corrosion class evaluation
Three key steps.First, the characteristic value data of plate test coupon detection zone, zoning segmentation threshold and standard class are obtained
Character pair value；The characteristic value of each location point and the diversity factor of standard class are calculated respectively, realize the corruption to each location point
Lose grade evaluation；According to requirement of actual working condition, the weight ratio of corroded area and depth is determined, the corrosion etc. of whole test specimen is calculated
Level, realizes the evaluation to plate test coupon extent of corrosion.
Corrosion evaluation method proposed by the present invention based on immersion type ultrasound detection, its general principle is：
1) corrosion area segmentation-thresholding method
Suitable segmentation threshold is selected using the different characteristic value information in each position in ultrasonic scanning, can be by original graph
As being divided into target and background parts, target part can be one or more., will be every first by whole detection zone discretization
Individual scanning element regards a small corrosion area as, and closure is presented in each corrosion area.All positions obtained by ultrasound detection
Characteristic value data a little is put, reasonable threshold value is selected, corrosion area is split, is divided into corrosion area and non-corrosive region, will
Corrosion area is divided into different brackets and calculates standard corrosion class character pair value.
2) characteristic value diversity factor calculating-minimum difference degree method
The characteristic for obtaining each location point is detected by Ultrasonic C-Scan, each location point is characterized with this feature value
Corrosion condition.Each location point character pair value and standard class character pair value are made into difference successively, in the difference for obtaining characteristic value
Minimum value, then the corresponding standard class of minimal difference be the location point corrosion class, so as to realize to position spot corrosion etc.
The quantization assessment of level.Comprise the following steps that：
(1) according to the parameter and ultrasound scan data of operating and setting, classification standard is generated.
(2) characteristic value corresponding to each location point and standard class characteristic value are made into difference successively, is referred to as the location point
Characteristic value diversity factor, the characteristic value diversity factor of location point is defined with formula 1：
D(i,j)=| X(i,j)-Bz| (1)
In formula, i, j are horizontal stroke, the ordinate of characteristic value correspondence scanning element, and X is to treat top location point characteristic value, a certain spies of B
Determine the corresponding characteristic value of corrosion class, z is the corresponding number of degrees of B characteristic values.
(3) the minimum difference degree minD of standard class and location point characteristic value is calculated(i,j), then minimum difference degree correspondence standard
Grade is the corrosion class of the location point.
3) corrosion class evaluation-weighting method
First by whole detection zone discretization, each scanning element is regarded as a small corrosion area, each small corrosion region
Closure is all presented in domain.Because inhomogeneities is presented in test specimen corrosion condition, the extent of corrosion of each small corrosion area is inconsistent.It is logical
The corrosion class data of each scanning element are crossed, the corrosion class of whole region is calculated.
Test specimen extent of corrosion is estimated, the extent of corrosion for only obtaining each small corrosion area is inadequate, in addition it is also necessary to
To the corrosion class of total, this method integrates corrosion class using weighting method calculation testing piece.Count first in each grade
Location point number in corrosion area area namely grade, afterwards by location point number and corresponding grade multiplied by weight and by institute
There is grade correspondence product to be added summation, be divided by with this and with total weight and ask for integrated level.Formula is as indicated with 2：
In formula, NiRepresent in grade i location point number, Q in corrosion area area namely gradeiRepresent corrosion class i
The shared weight in all grades.
The method not only allows for the otherness of each small corrosion area extent of corrosion, it is also contemplated that because each corrosion region
The difference for the contribution that domain area ratio is different and is done to whole corrosion structure, therefore evaluation result is more accurate.
The technical solution adopted by the present invention is as follows：
A kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system, the experimental system that uses of the present invention referring to
Fig. 1, experimental system includes computer 1, ultrasonic action receiving instrument 2, digital oscilloscope 3, four-axle linked scanning platform 4, immersion type
Receiving transducer 5, horizontal support bar 6, vertical supporting bar 7, retracting cylinder 8 and roller 9 is motivated by ultrasound.It is characterized in that：Computer 1 leads to
Cable is crossed to be connected with the control card on four-axle linked scanning platform 4；Immersion type ultrasonic action receiving transducer 5 is arranged on four-axle linked
The centre position of scanning platform 4, and immersion type ultrasonic action receiving transducer 5 be connected with control card.
Computer 1 is connected with ultrasonic action receiving instrument 2, and ultrasonic action receiving instrument 2 is connected with digital oscilloscope 3, immersion type
Ultrasonic action receiving transducer 5 is connected with ultrasonic action receiving instrument 2.
Two horizontal support bars 6 are symmetricly set on the both sides of four-axle linked scanning platform 4, and horizontal support bar 6 is horizontally disposed,
The side of horizontal support bar 6 is connected with vertical supporting bar 7, and vertical supporting bar 7 is inserted in retracting cylinder 8, and the bottom of retracting cylinder 8 is set
There is roller 9.
Test specimen is placed in the sink, and receiving transducer 5 is motivated by ultrasound just to test specimen in immersion type.
Four-axle linked scanning platform 4 is driven by servomotor.
The sidepiece of retracting cylinder 8 is provided with trip bolt, and the protrusion height of vertical supporting bar 7 is fixed by trip bolt.
The position regulating system being made up of first horizontal support bar 6, vertical supporting bar 7, retracting cylinder 8 and roller 9 is adjusted
The position of four-axle linked scanning platform 4, makes immersion type that receiving transducer 5 is motivated by ultrasound just to the test specimen in tank.
Then roller 9 is locked, the position of four-axle linked scanning platform 4 is corresponding with the position of tank.
Finally, computer 1 is by controlling card control servomotor, and servomotor drives four-axle linked scanning platform 4 to move,
So that four-axle linked scanning platform 4 drives immersion type ultrasonic action receiving transducer 5 to move.Ultrasonic action receiving instrument 2 is according to setting
Fixed repetition rate transmitting pulse signal, and be loaded on immersion type ultrasonic action receiving transducer 5, ul-trasonic irradiation is in test specimen
Afterwards, ultrasonic action receiving transducer 5 is received in echo-signal feeding ultrasonic action receiving instrument 2, then sends into the data of computer 1
Collection card docking is received waveform and handled, and extracts characteristic value and sends computer 1 back to；It is final to realize that computer 1 detects number to test specimen
According to storage, record.
The corrosion area data that ultrasound detection is obtained are recorded according to computer 1, corrosion area segmentation threshold and standard is calculated
Grade character pair value；The characteristic value of each location point and the diversity factor of standard class are calculated respectively, are realized to each location point
Corrosion class is evaluated；According to requirement of actual working condition, corroded area and depth weight ratio are determined, and then try to achieve whole test specimen structure
Corrosion class.
The present invention proposes a kind of hardened structure corrosion evaluation method based on immersion type ultrasound detection, and it implements step
It is as follows：
Step one：The plate structural test piece of different extent of corrosions and shape is prepared, defect test specimen relevant feature parameters are recorded, and
Packet numbering is carried out to the test specimen of different defect types.
Step 2：Detecting system is built and parameter setting；
1) based on immersion type ultrasonic scanning system, immersion type ultrasound detection corrosion evaluation system is built；
2) signal parameter is set：Including pumping signal parameter, signal parameter is received, controls ultrasonic action to connect by computer
Receive instrument and pumping signal is sent into immersion type ultrasonic exciting receiving transducer；
3) carry immersion type flat probe and carry out Ultrasonic C-Scan, be imaged respectively with time image and Amplitude echo imaging method；
4) carry immersion type point focusing probe and carry out Ultrasonic C-Scan, carried out respectively with time image and Amplitude echo imaging method
Imaging；
5) according to step 3), step 4) experimental result select imaging mode and detection is used pops one's head in.
Step 3：According to the parameter and selected testing conditions set in step 2, ultrasound is completed to detection test specimen and swept
Retouch, and store detection data.
Step 4：According to immersion type ultrasound scan data, complete test specimen corrosion class and evaluate.
1) the corrosion spool ultrasound scan data of acquisition is imported into corrosion evaluation system.
2) ultrasound scan data is read, corrosion area C-scan image is drawn out；Selected reasonable threshold value, enters to corrosion area
Row segmentation, is divided into corrosion area and non-corrosive region, and corrosion area is divided into 6 grades and standard corrosion class correspondence is calculated
Characteristic value.
3) Corrosion protection grade is carried out to each location point, by the characteristic value X corresponding to each location point(i,j), calculate location point
The difference D of characteristic value and each standard class character pair value(i,j)=| X(i,j)-Bz|, calculate the difference of location point characteristic value most
Small value min D(i,j), then the corresponding standard class of minimal difference is the corrosion class of the location point.
4) each grade weight is multiplied with the grade correspondence position point number, the product of number is multiplied to the gradational weight of institute
Summation, total weight is sought while all grade respective weights are added；It is divided by with this and with total weight, asks for test specimen and corrode comprehensive etc.
Level.
Wherein, NiRepresent in grade i location point number, Q in corrosion area area namely gradeiRepresent corrosion class i
The shared weight in all grades.
5) according to result of calculation, corrosion evaluation system provides test specimen and integrates corrosion class, according to corroded area ratio and
Indivedual depth transfinite the appearance situation of hot spot, provide evaluation opinion and alarm.
The present invention has advantages below：1) it can realize and the plate structure erosion of immersion type ultrasound detection is accurately commented
Valency；2) operation of the corrosion evaluation method to testing staff requires low, and required parameter is less；Therefore this method application conditions letter
Single, evaluation result is stable, there is relatively broad application.
Brief description of the drawings
Fig. 1 is immersion type ultrasonic scanning corrosion evaluation system line graph
Fig. 2 is hardened structure corrosion evaluation systems function diagram
Fig. 3 is hardened structure corrosion evaluation method flow diagram
Fig. 4 is that immersion type ultrasound detection plate fault of construction tests true corrosion spool sample
Fig. 5 is typical ladder (hole) defect steel plate (thickness of slab 19.00mm) rating result
Embodiment
Describe the implementation of the hardened structure corrosion evaluation method based on immersion type ultrasonic scanning in detail with reference to Fig. 1~Fig. 5
Process.
Step one：Test specimen is prepared according to requirement of experiment, this plate structural test piece thickness of slab 19mm, positive and negative fixed position distribution 5
Individual ladder hole defect, defect step number, pore size successively decrease successively.The test specimen prepared according to this such as accompanying drawing 4.
Step 2：Detecting system is built and relative parameters setting
1) based on immersion type ultrasonic scanning system, 1 immersion type ultrasound detection corrosion evaluation system is built with reference to the accompanying drawings；
2) signal parameter is set：This experiment is from MODEL5800 as ultrasonic action receiving instrument, and its parameter setting is as follows
Driving voltage 100V, driving frequency 500kHz, pattern are that P/E, energy are that 100uJ, damping are that 50ohm, high pass cut off frequency are
300KHz, low-pass cut-off frequencies are that 10MHz, gain are 40dB.Control MODEL 5800 that receiving instrument is motivated by ultrasound by computer,
Pumping signal is sent into ultrasonic exciting receiving transducer.
3) it is 5M to carry centre frequency, and wafer diameter is 20mm immersion type flat probe, carries out Ultrasonic C-Scan detection, point
It is not imaged with time image and Amplitude echo imaging method；
4) it is 5M to carry centre frequency, and wafer diameter is 13mm, and focal length is the 20mm ultrasonic point focusing probe of immersion type, is entered
Row Ultrasonic C-Scan is detected, is imaged respectively with time image and Amplitude echo imaging method；
5) according to 3), 4) experimental result of step is selected using time image mode and centre frequency as 5M, wafer diameter
For 13mm, focusing range is that the ultrasonic point focusing probe of 20mm immersion types is tested.
Step 3：According to the parameter and selected testing conditions set in step 2, immersion type is completed to detection test specimen
Ultrasonic scanning, and store detection data.
Step 4：According to immersion type ultrasound scan data, complete test specimen corrosion class and evaluate.
1) the corrosion spool ultrasound scan data of acquisition is imported into corrosion evaluation system.
2) ultrasound scan data is read, corrosion area C-scan image is drawn out.Rational threshold is selected according to scan data
Value, splits to corrosion area, is divided into corrosion area and non-corrosive region, corrosion area is divided into 6 grades and calculated
Standard corrosion class character pair value.
3) Corrosion protection grade is carried out to each location point, by the characteristic value X corresponding to each location point(i,j)With classification standard
Characteristic value compares step by step, calculates the difference D of characteristic value and Standard Eigenvalue(i,j)=| X(i,j)-Bz|.Calculate location point characteristic value it
The minimum value min D of difference(i,j), then the corresponding standard class of minimal difference is the corrosion class of the location point.
4) each grade weight is multiplied with the grade correspondence position point number, the product of number is multiplied to the gradational weight of institute
Summation, total weight is sought while all grade respective weights are added；It is divided by with this and with total weight, asks for test specimen and corrode comprehensive etc.
Level.Above-mentioned data are brought into formula 2 to calculate.
5) according to result of calculation, corrosion evaluation system provides test specimen and integrates corrosion class, according to corroded area ratio and
Indivedual depth transfinite the appearance situation of hot spot, provide evaluation opinion and alarm.
Step 5：Repeat step three, four completes ultrasonic scanning and the corrosion evaluation of five ladder (hole) defects of the test specimen,
Evaluation result is compareed with defect actual measured value parameter, comparing result is as shown in Figure 5.
Claims (5)
1. a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation method, its general principle is：
1) corrosion area segmentation-thresholding method
Suitable segmentation threshold is selected using the different characteristic value information in each position in ultrasonic scanning, can be by original image point
Target and background parts are cut into, target part can be one or more；First by whole detection zone discretization, swept each
Described point regards a small corrosion area as, and closure is presented in each corrosion area；All location points obtained by ultrasound detection
Characteristic value data, select reasonable threshold value, corrosion area is split, is divided into corrosion area and non-corrosive region, will corrode
Region division is different brackets and calculates standard corrosion class character pair value；
2) characteristic value diversity factor calculating-minimum difference degree method
The characteristic for obtaining each location point is detected by Ultrasonic C-Scan, the corrosion of each location point is characterized with this feature value
Situation；Each location point character pair value and standard class character pair value are made into difference successively, obtained in the difference of characteristic value most
Small value, then the corresponding standard class of minimal difference is the corrosion class of the location point, so as to realize to position spot corrosion grade
Quantization assessment；Comprise the following steps that：
(1) according to the parameter and ultrasound scan data of operating and setting, classification standard is generated；
(2) characteristic value corresponding to each location point and standard class characteristic value are made into difference successively, is referred to as the feature of the location point
It is worth diversity factor, the characteristic value diversity factor of location point is defined with formula 1：
D(i,j)=| X(i,j)-Bz| (1)
In formula, i, j are horizontal stroke, the ordinate of characteristic value correspondence scanning element, and X is to treat top location point characteristic value, a certain specific corruption of B
The corresponding characteristic value of grade is lost, z is the corresponding number of degrees of B characteristic values；
(3) the minimum difference degree minD of standard class and location point characteristic value is calculated(i,j), then minimum difference degree correspondence standard class
For the corrosion class of the location point；
3) corrosion class evaluation-weighting method
First by whole detection zone discretization, each scanning element is regarded as a small corrosion area, each small corrosion area
Closure is presented；Because inhomogeneities is presented in test specimen corrosion condition, the extent of corrosion of each small corrosion area is inconsistent；By every
The corrosion class data of individual scanning element, calculate the corrosion class of whole region；
Test specimen extent of corrosion is estimated, the extent of corrosion for only obtaining each small corrosion area is inadequate, in addition it is also necessary to obtain whole
The corrosion class of individual structure, this method integrates corrosion class using weighting method calculation testing piece；Count in each grade and corrode first
Location point number in region area namely grade, afterwards by location point number and corresponding grade multiplied by weight and will be all etc.
Level correspondence product is added summation, is divided by with this and with total weight and asks for integrated level；Formula is as indicated with 2：
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In formula, NiRepresent in grade i location point number, Q in corrosion area area namely gradeiRepresent corrosion class i in institute
Shared weight in some grades；
The method not only allows for the otherness of each small corrosion area extent of corrosion, it is also contemplated that because each corrosion area face
The difference for the contribution that product ratio is different and is done to whole corrosion structure, therefore evaluation result is more accurate.
2. a kind of hardened structure corrosion evaluation method based on immersion type ultrasound detection according to claim 1, its feature exists
In：It is as follows that it implements step：
Step one：The plate structural test piece of different extent of corrosions and shape is prepared, defect test specimen relevant feature parameters are recorded, and to not
Test specimen with defect type carries out packet numbering；
Step 2：Detecting system is built and parameter setting；
1) based on immersion type ultrasonic scanning system, immersion type ultrasound detection corrosion evaluation system is built；
2) signal parameter is set：Including pumping signal parameter, signal parameter is received, is connect by computer software control ultrasonic action
Receive instrument and pumping signal is sent into immersion type ultrasonic exciting receiving transducer；
3) carry immersion type flat probe and carry out Ultrasonic C-Scan, be imaged respectively with time image and Amplitude echo imaging method；
4) carry immersion type point focusing probe and carry out Ultrasonic C-Scan, be imaged respectively with time image and Amplitude echo imaging method；
5) according to step 3), step 4) experimental result select imaging mode and detection is used pops one's head in；
Step 3：According to the parameter and selected testing conditions set in step 2, ultrasonic scanning is completed to detection test specimen, and
Storage detection data；
Step 4：According to immersion type ultrasound scan data, complete test specimen corrosion class and evaluate；
1) the corrosion spool ultrasound scan data of acquisition is imported into corrosion evaluation system；
2) ultrasound scan data is read, corrosion area C-scan image is drawn out；Selected reasonable threshold value, is divided corrosion area
Cut, be divided into corrosion area and non-corrosive region, corrosion area is divided into 6 grades and standard corrosion class character pair is calculated
Value；
3) Corrosion protection grade is carried out to each location point, by the characteristic value X corresponding to each location point(i,j), calculate position point feature
The difference D of value and each standard class character pair value(i,j)=| X(i,j)-Bz|, calculate the minimum value of the difference of location point characteristic value
minD(i,j), then the corresponding standard class of minimal difference is the corrosion class of the location point；
4) each grade weight is multiplied with the grade correspondence position point number, the product that the gradational weight of institute multiplies number is asked
With, at the same by all grade respective weights be added seek total weight；It is divided by with this and with total weight, asks for test specimen and corrode comprehensive etc.
Level；
<mrow>
<mi>D</mi>
<mi>e</mi>
<mi>g</mi>
<mi>r</mi>
<mi>e</mi>
<mi>e</mi>
<mo>=</mo>
<mfrac>
<mrow>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mn>6</mn>
</munderover>
<mrow>
<mo>(</mo>
<msub>
<mi>N</mi>
<mi>i</mi>
</msub>
<mo>*</mo>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
<mo>)</mo>
</mrow>
</mrow>
<mrow>
<munderover>
<mi>&Sigma;</mi>
<mrow>
<mi>i</mi>
<mo>=</mo>
<mn>1</mn>
</mrow>
<mn>6</mn>
</munderover>
<msub>
<mi>Q</mi>
<mi>i</mi>
</msub>
</mrow>
</mfrac>
</mrow>
Wherein, NiRepresent in grade i location point number, Q in corrosion area area namely gradeiRepresent corrosion class i in institute
Shared weight in some grades；
5) according to result of calculation, corrosion evaluation system provides test specimen and integrates corrosion class, according to corroded area ratio and individually
Depth transfinites the appearance situation of hot spot, provides evaluation opinion and alarm.
3. a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation built using evaluation method described in claim 1 is tested
System, it is characterised in that：Experimental system includes computer (1), ultrasonic action receiving instrument (2), digital oscilloscope (3), four axles connection
Dynamic scanning platform (4), immersion type ultrasonic action receiving transducer (5), horizontal support bar (6), vertical supporting bar (7), retracting cylinder (8)
With roller (9)；Computer (1) is connected by cable with the control card on four-axle linked scanning platform (4)；Immersion type is motivated by ultrasound
Receiving transducer (5) is arranged on the centre position of four-axle linked scanning platform (4), and immersion type ultrasonic action receiving transducer (5)
It is connected with control card；
Computer (1) is connected with ultrasonic action receiving instrument (2), and ultrasonic action receiving instrument (2) is connected with digital oscilloscope (3), water
Immersion ultrasonic action receiving transducer (5) is connected with ultrasonic action receiving instrument (2)；
Two horizontal support bars (6) are symmetricly set on the both sides of four-axle linked scanning platform (4), horizontal support bar (6) horizontal cloth
Put, the side of horizontal support bar (6) is connected with vertical supporting bar (7), and vertical supporting bar (7) is inserted in retracting cylinder (8), stretch
The bottom of cylinder (8) is provided with roller (9)；
Test specimen is placed in the sink, and immersion type ultrasonic action receiving transducer (5) is just to test specimen.
4. a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system according to claim 3, its feature
It is：Four-axle linked scanning platform (4) is driven by servomotor.
5. a kind of immersion type ultrasound detection storage tank bottom plate corrosion evaluation experimental system according to claim 3, its feature
It is：The sidepiece of retracting cylinder (8) is provided with trip bolt.
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| CN114965705A (en) * | 2022-04-29 | 2022-08-30 | 南通俊朗智能科技有限公司 | Temperature interference resistant ultrasonic detection method and system for corrosion of oil storage tank |
| CN115718061A (en) * | 2022-11-25 | 2023-02-28 | 中国特种设备检测研究院 | Method, system and equipment for evaluating corrosion layer of heat-resistant steel material |
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