Corrosion detection and evaluation method for vertical atmospheric storage tank wallboard

Abstract

The invention relates to the technical field of corrosion monitoring, and discloses a vertical atmospheric storage tank wallboard corrosion detection and evaluation method which comprises the following steps: step 1, formulating a detection process procedure, ensuring that the detection process is smoothly implemented, and realizing that a data acquisition area meets the coverage requirement of a standard on a corrosion area; step 2, a detection path guiding method: measuring and calculating the distance between detection lines at the lower part of the storage tank by adopting a surveying and mapping level laser gradienter or marking instrument with a vertical line function, and determining a detection path; and step 3, software development: vertical atmospheric storage tank wallboard corrosion analysis and evaluation software is developed, and the software has the functions of automatically calculating the wall thickness allowable value and automatically evaluating the corrosion condition. By applying the steps based on the magnetic wall-climbing electromagnetic ultrasonic detection technology, line scanning is realized to collect a large amount of data, and the problem of instant calculation and analysis of a large amount of wall thickness data meeting standard requirements obtained through online detection is solved by evaluating and analyzing a large amount of data.

Description

Technical Field

[0001] The present invention relates to the technical field of corrosion monitoring, and particularly to a method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank. Background Technique

[0002] When detecting the corrosion condition of the wall plate of a vertical atmospheric storage tank, it is necessary to measure the wall thickness of the wall plate and evaluate the corrosion condition of the wall plate in accordance with TCASEI 014-2022 "Inspection Technical Specification for In-Service Vertical Cylindrical Steel Welded Storage Tanks". TCASEI 014-2022 "Inspection Technical Specification for In-Service Vertical Cylindrical Steel Welded Storage Tanks" clearly stipulates the corrosion detection and evaluation of the tank top and tank wall. Its key indicators are the determination of the corrosion area and the calculation of the average wall thickness within the corrosion area. However, the following problems exist in actual application, making it difficult to carry out detection and evaluation in accordance with the standard requirements: First, after the tank is emptied, a scaffold is erected inside the tank for grinding and rust removal, and data is obtained through macroscopic inspection, ultrasonic thickness measurement technology, and corrosion pit depth measurement methods. The detection cost is high, the inspection cycle is long, and the data acquisition path is intermittent, so that it cannot fully meet the standard requirements. Second, when obtaining the wall thickness data by ultrasonic on-line thickness measurement by erecting a scaffold outside the tank wall, when detecting the outer wall, it is difficult to achieve the line scanning method required by the standard using the traditional discrete point detection method. When using the traditional detection method for evaluation, it mainly relies on practical experience for judgment rather than evaluation through data volume calculation, resulting in a deviation between the evaluation result and the standard requirements.

[0003] Therefore, those skilled in the art provide a method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank to solve the problems raised in the above background technique. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank, which solves the problem that when detecting the outer wall, it is difficult to achieve the line scanning method required by the standard using the traditional discrete point detection method, and when using the traditional detection method for evaluation, it mainly relies on practical experience for judgment rather than evaluation through data volume calculation, resulting in a deviation between the evaluation result and the standard requirements.

[0005] To achieve the above object, the present invention is realized through the following technical solutions: A method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank includes the following steps: Step 1: Formulate a detection process specification to ensure the smooth implementation of the detection process and achieve that the data acquisition area meets the coverage requirements of the standard for the corrosion area; Step 2: A detection path guiding method, using a surveying-grade laser level or line marker with a vertical line function to measure and calculate the distance between the detection lines at the lower part of the storage tank to determine the detection path; Step 3: Software development. Develop software for corrosion analysis and evaluation of the vertical atmospheric storage tank wall panels. The software has the functions of automatically calculating the allowable wall thickness value and automatically evaluating the corrosion condition. Step 4: Data collection. Use magnetic wall-climbing electromagnetic ultrasonic thickness measurement equipment to collect the thickness data of the vertical atmospheric storage tank wall panels. Step 5: Data transfer. Transmit the wall thickness detection data to the corrosion analysis and evaluation software for the vertical atmospheric storage tank wall panels. Step 6: Analysis and evaluation. Evaluate the detection results through the software to obtain an evaluation conclusion.

[0006] Preferably, in Step 1, it includes data collection methods, evaluation area determination methods, determination of the detection path for the evaluation area, detection along the guiding light, and the relationship between detection paths: Data collection methods. Determine the data collection methods according to the detection. Evaluation area determination method. When the area where the wall thickness of the tank wall panel is thinned by 12% is reached, determine the evaluation area. Determination of the detection path for the evaluation area. Utilize the parallel characteristics of the detection lines to determine the detection path at the lower part of the storage tank, and guide it through the light perpendicular to the ground. Detection along the guiding light. Collect data and input it into the evaluation and analysis software. Relationship between detection paths. Input the relationship between detection paths into the evaluation and analysis software and use the evaluation system for evaluation.

[0007] Preferably, the data collection methods include collecting data using a digital ultrasonic thickness gauge and collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment: Collecting data using a digital ultrasonic thickness gauge. Conduct discrete point data collection on the wall panels and roof along the ground and ladders. The distribution of the collection points covers the entire height, or collect data according to user requirements. Collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment. For an atmospheric vertical storage tank without insulation layer coverage, collect data at fixed intervals or continuously along the vertical direction of the tank wall panel, and collect data at fixed intervals or continuously along the radial direction of the roof.

[0008] Preferably, the evaluation area determination methods include collecting data using a digital ultrasonic thickness gauge and collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment: Collecting data using a digital ultrasonic thickness gauge. When detecting in an area accessible to personnel, use ultrasonic thickness measurement to determine the boundary of the evaluation area and make on-site markings. Collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment. When detecting in an area inaccessible to personnel, use magnetic wall-climbing electromagnetic ultrasonic thickness measurement to determine the boundary of the evaluation area.

[0009] Preferably, the data collection by the magnetic wall-climbing electromagnetic ultrasonic testing equipment includes the collection in the vertical direction range and the collection in the horizontal direction range.

[0010] Preferably, the collection in the vertical direction range includes fixed-spacing collection and continuous collection: For fixed-spacing collection, using the position information of the collected data and the circumferential welds of the wall plate at the thinning point as a reference, operate the testing equipment to perform continuous collection in the vertical direction within the range above and below this position; For continuous collection, directly determine the vertical direction range of the evaluation area according to the position information of the collected data.

[0011] Preferably, the collection in the horizontal direction range includes the following methods: Method 1: According to the position information of the continuously collected data, operate the testing equipment to reach the middle position in the vertical direction of the evaluation area, and use the laser beam emitted by a laser level or other measuring equipment for horizontal marking; operate the testing equipment to continuously collect data along the horizontal marking light; determine the horizontal range of the evaluation area according to the collected data and position information; Method 2: Use the laser beam to align the corrosion part in the vertical direction perpendicular to the ground at the lower part of the storage tank, make a mark, and mark the spacing on both sides of this part. Use the laser beam to guide the crawler to collect data on both sides of the discovered corrosion part, determine the initial spacing on both sides of the part, and adjust the detection path according to the detection results to determine the horizontal corrosion range. The corrosion range is measured and recorded at the lower part of the storage tank using the principle of equal spacing of parallel lines.

[0012] Preferably, the initial spacing is 500 mm.

[0013] The present invention provides a method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank. It has the following beneficial effects: By applying each step of the magnetic wall-climbing electromagnetic ultrasonic testing technology, the present invention realizes line scanning to collect a large amount of data, and through the evaluation and analysis of a large amount of data, solves the problem of obtaining a large amount of wall thickness data that meets the standard requirements in on-line detection. At the same time, by using software for calculation and analysis, it solves the problems of calculation and analysis of a large amount of data and corrosion evaluation, ensuring that the evaluation results meet the standard requirements, and providing an accurate and reliable basis for the corrosion detection of the wall plate of the storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a flow chart of the present invention; Figure 2 is a schematic diagram of the light-guided detection path of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the scope of protection of the present invention. Embodiment

[0016] Please refer to the attached Figure 1 - attached Figure 2 , the embodiment of the present invention provides a method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank, including the following steps: Step 1: Formulate a detection process specification to ensure the smooth implementation of the detection process and achieve that the data acquisition area meets the coverage requirements of the standard for the corrosion area; Step 2: Detection path guiding method. Use a surveying-grade laser level or line marker with a vertical line function to measure and calculate the distance between the detection lines at the lower part of the storage tank to determine the detection path; Step 3: Software development. Develop software for analyzing and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank. The software has the functions of automatically calculating the allowable wall thickness value and automatically evaluating the corrosion condition; Step 4: Data acquisition. Use a magnetic wall-climbing electromagnetic ultrasonic thickness measurement device to collect the wall thickness data of the wall plate of the vertical atmospheric storage tank; Step 5: Data transfer. Transmit the wall thickness detection data to the software for analyzing and evaluating the corrosion of the wall plate of the atmospheric storage tank; Step 6: Analysis and evaluation. Evaluate the detection results through the software to obtain an evaluation conclusion.

[0017] Formulating a detection process specification ensures that the detection process is carried out in accordance with the specifications, guarantees that the data acquisition area meets the coverage requirements of the corrosion area, and when formulating the specification, it is necessary to clarify the detection objectives, methods, equipment requirements, and data acquisition methods; the detection path guiding method can determine the detection path of the wall plate of the storage tank by calculating the distance between the detection lines, facilitating subsequent data acquisition and analysis; software development automatically analyzes and evaluates according to the standard specifications and wall thickness detection data, improving efficiency and accuracy; data acquisition can measure the wall plate in a non-contact manner to provide high-precision thickness data; data transfer can realize the automated processing and analysis of data, reduce errors in manual operations, and improve the efficiency of data processing; analysis and evaluation automatically evaluate the corrosion condition, determine whether there are corrosion problems on the wall plate of the storage tank, and give corresponding conclusions and suggestions to guide subsequent maintenance and repair work.

[0018] In Step 1, it includes data acquisition method, evaluation area determination method, determination of the detection path of the evaluation area, detection along the guiding light, and the relationship between detection paths: Data acquisition method. Determine the data acquisition method according to the detection; Evaluation area determination method: When the area where the thickness of the tank wall plate is reduced by 12% is reached, the evaluation area is determined. Determine the detection path for the evaluation area. Utilize the parallel characteristics of the detection lines to determine the detection path at the lower part of the storage tank, and guide it through the light perpendicular to the ground. Detect along the guiding light, and collect data and input it into the evaluation and analysis software. Relationship between detection paths: Input the relationship between detection paths into the evaluation and analysis software, and utilize the evaluation system for evaluation.

[0019] The data acquisition method is to collect non-contact wall plate thickness data through a magnetic climbing electromagnetic ultrasonic thickness measurement device; the evaluation area determination method: When the wall plate thickness is reduced by 12%, this area can be determined as the evaluation area; determining the detection path for the evaluation area can ensure that the evaluation area is covered and maintain the continuity of detection; detecting along the guiding light uses a magnetic climbing electromagnetic ultrasonic thickness measurement device tool to measure the thickness of the storage tank wall plate, and input the collected data into the evaluation and analysis software; the relationship between detection paths can ensure that the evaluation system can reasonably analyze and evaluate the data according to the position and spacing between paths.

[0020] The data acquisition methods include collecting data using a digital ultrasonic thickness gauge and collecting data using a magnetic climbing electromagnetic ultrasonic detection device: Collect data using a digital ultrasonic thickness gauge. Discrete point data of the wall plate and roof are collected along the ground and ladders. The distribution of the collection points covers the entire height, or data is collected according to user requirements. Collect data using a magnetic climbing electromagnetic ultrasonic detection device. For an atmospheric vertical storage tank without insulation layer coverage, collect data at fixed intervals or continuously along the vertical direction of the ground for the tank wall plate, and collect data at fixed intervals or continuously along the radial direction for the roof.

[0021] Collect data using a digital ultrasonic thickness gauge. The digital ultrasonic thickness gauge can quickly and accurately obtain the thickness data of the wall plate and roof at the corresponding positions; collecting data using a magnetic climbing electromagnetic ultrasonic detection device can be magnetically adsorbed on the surface of the storage tank to achieve non-contact measurement of the wall plate and roof, with high precision and the ability to adapt to different shapes.

[0022] The evaluation area determination methods include collecting data using a digital ultrasonic thickness gauge and collecting data using a magnetic climbing electromagnetic ultrasonic detection device: Collect data using a digital ultrasonic thickness gauge. When detecting in areas accessible to personnel, use ultrasonic thickness measurement to determine the boundary of the evaluation area and make on-site markings. Collect data using a magnetic climbing electromagnetic ultrasonic detection device. When detecting in areas inaccessible to personnel, use magnetic climbing electromagnetic ultrasonic thickness measurement to determine the boundary of the evaluation area.

[0023] Data is collected using a digital ultrasonic thickness gauge. Measuring the wall panel with the ultrasonic thickness gauge helps with subsequent data analysis and evaluation. Data is collected using a magnetic wall-climbing electromagnetic ultrasonic testing device. The boundary of the evaluation area is determined by the magnetic wall-climbing electromagnetic ultrasonic testing device, which is applicable to parts that cannot be directly contacted or safely reached, and can accurately determine the evaluation area.

[0024] Collecting data with the magnetic wall-climbing electromagnetic ultrasonic testing device includes collecting in the vertical direction range and collecting in the horizontal direction range; Collecting in the vertical direction range includes collecting at fixed intervals and continuous collecting: For collecting at fixed intervals, using the position information of the collected data and the surrounding welds of the wall panel at the thinning point as a reference, operate the testing device to perform continuous vertical collecting within the range above and below this position; For continuous collecting, directly determine the vertical direction range of the evaluation area according to the position information of the collected data.

[0025] Collecting at fixed intervals can obtain the thickness data of the evaluation area through the measurement points at fixed intervals. At the same time, it provides more comprehensive evaluation information. For continuous collecting, when the magnetic wall-climbing electromagnetic ultrasonic testing device moves vertically, data is continuously obtained, not restricted by a fixed spacing. And through continuous collecting, the thickness of the wall panel in the evaluation area can be more comprehensively understood, and a more accurate evaluation result can be provided.

[0026] The following methods are included in collecting in the horizontal direction range: Method 1: According to the position information of the continuously collected data, operate the testing device to reach the middle position in the vertical direction of the evaluation area, and use the laser beam emitted by a laser level or other measuring device for horizontal marking; operate the testing device to continuously collect data along the horizontal marking light; determine the horizontal range of the evaluation area according to the collected data and position information; Method 2: Align the corrosion part in the vertical direction perpendicular to the ground at the lower part of the storage tank using a laser beam, make a mark, and mark the spacing on both the left and right sides of this part. Use the laser beam to guide the crawler to collect data on both sides of the discovered corrosion part, determine the initial spacing on both sides of the part, and adjust the detection path according to the detection results to determine the horizontal corrosion range. The corrosion range is measured and recorded at the lower part of the storage tank using the principle of equal spacing of parallel lines, and the initial spacing is 500 mm.

[0027] Method 1 can establish a horizontal reference line at the middle position in the vertical direction of the evaluation area by using the laser beam for horizontal marking, making the data collection more accurate and consistent, and then determining the horizontal range. Method 2 can accurately determine the horizontal direction of the corrosion range by using the laser beam for marking and guiding, and provide an effective data basis for subsequent data analysis and evaluation.

[0028] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art will appreciate that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for detecting and evaluating the corrosion of the wall plates of a vertical atmospheric storage tank, characterized in that, It includes the following steps: Step 1: Formulate the inspection process regulations to ensure the smooth implementation of the inspection process and achieve the coverage requirement of the data acquisition area for the corrosion area in line with the standards; Step 2: Inspection path guiding method. Use a surveying-grade laser level or line marker with a vertical line function to measure and calculate the spacing between inspection lines at the lower part of the storage tank to determine the inspection path; Step 3: Software development. Develop software for corrosion analysis and evaluation of the vertical atmospheric storage tank wall. The software has the functions of automatically calculating the allowable wall thickness value and automatically evaluating the corrosion condition; Step 4: Data acquisition. Use magnetic wall-climbing electromagnetic ultrasonic thickness measurement equipment to collect the wall thickness data of the vertical atmospheric storage tank wall; Step 5: Data transfer. Transmit the wall thickness detection data to the software for corrosion analysis and evaluation of the atmospheric storage tank wall; Step 6: Analysis and evaluation. Evaluate the inspection results through the software to obtain an evaluation conclusion.

2. The method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank according to claim 1, wherein, The first step includes the data acquisition method, the evaluation area determination method, the determination of the inspection path for the evaluation area, the inspection along the guiding light, and the relationship between inspection paths: Data acquisition method. Determine the data acquisition method according to the inspection; Evaluation area determination method. When the wall thickness of the tank wall plate is thinned by 12%, determine the evaluation area; Determination of the inspection path for the evaluation area. Utilize the parallel characteristics of the inspection lines to determine the inspection path at the lower part of the storage tank and guide it through the light perpendicular to the ground; Inspection along the guiding light. Collect data and input it into the evaluation and analysis software; Relationship between inspection paths. Input the relationship between inspection paths into the evaluation analysis software and use the evaluation system for evaluation.

3. A method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank according to claim 2, characterized in that, The data acquisition method includes collecting data using a digital ultrasonic thickness gauge and collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment: Collect data using a digital ultrasonic thickness gauge. Collect discrete point data of the wall plate and roof along the ground and ladder. The collection points are distributed over the entire height, or collect data according to user requirements; Collect data using magnetic wall-climbing electromagnetic ultrasonic detection equipment. For an atmospheric vertical storage tank without insulation layer coverage, collect data at fixed intervals or continuously along the vertical ground direction for the tank wall plate, and collect data at fixed intervals or continuously along the radial direction for the roof.

4. The method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank according to claim 2, characterized in that, The evaluation area determination method includes collecting data using a digital ultrasonic thickness gauge and collecting data using magnetic wall-climbing electromagnetic ultrasonic detection equipment: Collect data using a digital ultrasonic thickness gauge. When detecting in an area accessible to personnel, use ultrasonic thickness measurement to determine the boundary of the evaluation area and make on-site markings; Collect data using magnetic wall-climbing electromagnetic ultrasonic detection equipment. When detecting in an area inaccessible to personnel, use magnetic wall-climbing electromagnetic ultrasonic thickness measurement to determine the boundary of the evaluation area.

5. A method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank according to claim 4, characterized in that, The collection of data using magnetic wall-climbing electromagnetic ultrasonic detection equipment includes collection in the vertical direction range and collection in the horizontal direction range.

6. A vertical atmospheric storage tank wall corrosion detection and evaluation method according to claim 5, characterized in that, The collection in the vertical direction range includes collection at fixed intervals and continuous collection: Collection at fixed intervals. Use the position information of the collected data and the surrounding welds of the wall plate at the thinning point as a reference, operate the detection equipment, and conduct continuous collection in the vertical direction within the range above and below this position; Continuous collection. Directly determine the vertical direction range of the evaluation area according to the position information of the collected data.

7. A method for detecting and evaluating the corrosion of the wall plate of a vertical atmospheric storage tank according to claim 5, characterized in that, The acquisition of the horizontal range includes the following methods: Method 1: According to the position information of continuously acquired data, operate the detection device to reach the middle position in the vertical direction of the evaluation area, and use the laser beam emitted by a laser level or other measuring device for horizontal marking; operate the detection device to continuously acquire data along the horizontal marking light; determine the horizontal range of the evaluation area according to the acquired data and position information; Method 2: Use the laser beam to align the corrosion part in the vertical direction perpendicular to the ground at the lower part of the storage tank, make a mark, and mark the spacing on both the left and right sides of this part. Use the laser beam to guide the crawler to acquire data on both sides of the discovered corrosion part, determine the initial spacing on both sides of the part, and adjust the detection path according to the detection results to determine the horizontal corrosion range. The corrosion range is measured and recorded at the lower part of the storage tank using the principle of equal spacing of parallel lines.

8. A vertical atmospheric storage tank wall corrosion detection and evaluation method according to claim 7, characterized in that, The initial spacing is 500 mm.

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