An automatic defect parameter detection system and risk assessment method for atmospheric storage tanks

Abstract

The present invention discloses an automatic detection system for defect parameters of an atmospheric storage tank and a risk assessment method. The automatic detection system for defect parameters includes a detection device, a crawling device, a data communication device, and a control and processing device; the detection device includes a mounting seat and an acoustic emission sensor; the crawling device includes a support, a front-end adsorption device, a rear-end adsorption device, a telescopic driving device, and a lifting driving device; the front-end adsorption device is arranged on the mounting seat; the rear-end adsorption device is arranged on the support; the telescopic driving device is installed on the support, and the working end of the telescopic driving device is connected to the mounting seat; the lifting driving device is used to drive the front-end adsorption device and the rear-end adsorption device to perform lifting movements independently; the control and processing device is used to receive the data information uploaded by the detection device, and by analyzing and calculating the data information, obtain the defect parameters of the atmospheric storage tank, and calculate the risk level through a risk assessment system.

Description

Technical Field

[0001] The present invention relates to the field of petrochemical industry, and particularly relates to an automatic detection system for defect parameters of atmospheric storage tanks and a risk assessment method. Background Art

[0002] Atmospheric storage tanks are special equipment with danger in the petrochemical industry. The volume of the largest oil tank in the world reaches 240,000 cubic meters, and the volume of the largest storage tank built and used in China is 150,000 cubic meters, among which 100,000 cubic meter storage tanks are quite common. In recent years, with the continuous strengthening of China's petroleum strategic position, the number of storage tanks in China has also been increasing continuously, and the storage tanks are developing towards the trend of large-scale. Most of the storage media in atmospheric storage tanks have characteristics such as flammability, explosiveness or toxicity. At the same time, due to the influence of the storage tank structure, operating conditions, insufficient experience of management personnel and loose management, the failure probability of storage tanks is greatly increased. Once a leakage occurs, it may trigger catastrophic accidents such as fires, explosions and poisoning, causing serious environmental pollution, and bringing huge losses and hazards to social economy, production and people's lives and property. Therefore, the management problem of atmospheric storage tanks is the focus of attention of society and enterprises.

[0003] At present, the management of atmospheric storage tanks by petrochemical enterprises in China has not yet been incorporated into the track of legal management. Moreover, the number of storage tanks is large, and it is difficult to conduct inspections one by one. In order not to affect production, each enterprise adopts the method of sampling inspection. However, this sampling inspection method often relies on manual experience and does not have a reasonable classification and grading management method, and its results will cause two disadvantages: on the one hand, the results of sampling inspection show that most storage tanks have no defects. If the tank opening inspection is frequent, it will cause serious economic losses; on the other hand, storage tanks with greater potential risks cannot be inspected on schedule, and the storage tanks are severely aged and over-serviced, resulting in many potential safety hazards.

[0004] The risk-based inspection (RBI) technology is used to conduct risk assessment on atmospheric storage tanks, analyze and calculate the failure possibility and failure consequences of atmospheric storage tanks, determine the risk levels of each equipment item of the storage tanks, and analyze the factors that may cause risks to provide reference and basis for the comprehensive inspection of common storage tanks. The risk-based inspection (RBI) technology for in-service atmospheric storage tanks, as an advanced management concept with risk assessment as the core, integrates the information management technology and detection and evaluation technology of the storage tank area, which is a higher level of the current storage tank system management. It solves the problems of over-detection and under-detection existing in traditional inspections, greatly reduces the risk of the tank area and the inspection and maintenance costs, and has important significance for enterprises to improve the operation and production efficiency and achieve long-term safe operation of equipment.

[0005] However, during the implementation of RBI, API 581 (American Petroleum Institute) risk-based resource documents have achieved good results in the implementation in the US petrochemical industry. Since the introduction of RBI technology into China, it has gone through three stages: technology transformation, pilot application, and wide application. The RBI technology has entered the fourth stage in China - the stage of substantial application. In this stage, it is more necessary to think about and correct the problems existing in the RBI assessment work according to China's national conditions, truly digest and improve foreign related technologies, reject replication, and strengthen the formulation and revision of systematic laws, regulations, and related standards.

[0006] The following problems mainly exist in the risk-based inspection of in-service atmospheric storage tanks: There is still a large gap in the failure mechanism for calculating the failure probability of the risk-based inspection method compared with foreign countries; there is a lack of failure data; less consideration is given to the original defects; it is required that the evaluation personnel have rich on-site inspection experience of in-service atmospheric storage tanks, and at the same time need to master multiple disciplines such as metal materials science and non-destructive testing, with relatively high comprehensive qualities; evaluation methods are given in GB / T 26610 and GB / T 30578, the calculation formulas are complex, and if manual calculation is used, the calculation is cumbersome, the efficiency is low, and errors are prone to occur.

[0007] In addition, during the risk assessment calculation process, it is necessary to first detect the defects of the in-service atmospheric storage tank to be evaluated to obtain parameters such as corrosion data of the tank wall and the bottom of the storage tank, which are used as part of the basic data for risk assessment; for example, in the prior art, acoustic emission detection technology is commonly used to perform non-destructive detection on the defect parameters of the storage tank. During detection, acoustic emission sensors are arranged along the circumferential direction on the outer wall of the storage tank, and the acoustic emission sensors are fixed at set positions in the circumferential direction and the vertical direction. During detection, each acoustic emission sensor transmits data to the host computer for calculation, so as to calculate the corrosion condition of the storage tank, such as calculating the corrosion thinning data or local corrosion data at the bottom of the storage tank. The above detection process is usually completed manually. The storage tanks in the petrochemical field are usually large in size, and it is necessary to accurately arrange acoustic emission sensors in the circumferential direction and at high positions, with high operation difficulty and low accuracy of position positioning. Summary of the Invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide an automatic detection system for defect parameters of an atmospheric storage tank. The automatic detection system can automatically and accurately complete the arrangement of sensors, and detect the corrosion degree of the wall of the atmospheric storage tank, providing basic data for subsequent calculation of the risk level assessment of the atmospheric storage tank.

[0009] The second purpose of the present invention is to provide a risk assessment method for an atmospheric storage tank applying the above automatic detection system.

[0010] The technical solution for the present invention to solve the above technical problems is as follows:

[0011] An automatic defect parameter detection system for an atmospheric storage tank, comprising a detection device, a crawling device for driving the detection device to move on the wall of the atmospheric storage tank, a data communication device, and a control and processing device. Among them,

[0012] The detection device includes a mounting seat and an acoustic emission sensor arranged on the mounting seat, and among them, the acoustic emission sensor is used to detect the corrosion data of the wall of the atmospheric storage tank;

[0013] The crawling device includes a support, a front-end adsorption device, a rear-end adsorption device, a telescopic driving device, and a lifting driving device arranged on the support. Among them, the front-end adsorption device is arranged on the mounting seat; the rear-end adsorption device is arranged on the support; the telescopic driving device is installed on the support, and the working end of the telescopic driving device is connected to the mounting seat for driving the front-end adsorption device to perform linear telescopic movement; the lifting driving device is used to drive the front-end adsorption device and the rear-end adsorption device to perform lifting movement separately;

[0014] The data communication device is used to upload the data information collected by the detection device to the control and processing device and transmit the control instructions issued by the control and processing device to the crawling device and the detection device;

[0015] The control and processing device is used to receive the data information uploaded by the detection device, and through analyzing and calculating the data information, realize risk assessment of the wall of the atmospheric storage tank to obtain the defect parameters of the atmospheric storage tank.

[0016] Preferably, a vertical driving mechanism for driving the acoustic emission sensor to perform vertical movement and a vertical guiding mechanism for guiding the vertical movement of the acoustic emission sensor are further arranged between the mounting seat and the acoustic emission sensor. Among them, the vertical driving mechanism is installed on the mounting seat, and the vertical driving mechanism adopts a driving mode combining a vertical motor and a vertical screw drive mechanism. Among them, the vertical motor is installed on the mounting seat, and the vertical screw in the vertical screw drive mechanism is connected to the main shaft of the vertical motor; the vertical screw nut in the vertical screw drive mechanism is connected to the vertical slider in the vertical guiding mechanism, and the vertical slide rail in the vertical guiding mechanism is installed on the mounting seat; the acoustic emission sensor is installed on the vertical slider.

[0017] Preferably, the front end adsorption device includes front end electromagnets arranged on both sides of the vertical driving mechanism and a connecting member for connecting the front end electromagnets to the mounting seat. Among them, the connecting member includes a connecting rod, a connecting sleeve, and a connecting spring arranged between the connecting rod and the connecting sleeve. Among them, the upper end of the connecting rod is connected to the mounting seat, and the lower end extends into the connecting sleeve; a connecting channel for the vertical sliding of the connecting rod is arranged in the connecting sleeve, the lower end of the connecting channel communicates with the inner cavity of the connecting sleeve, and the diameter of the inner cavity is larger than that of the connecting channel; the lower end of the connecting rod passes through the connecting channel and is connected to a limiting block located in the inner cavity, and the diameter of the limiting block is larger than that of the connecting channel; the connecting spring is sleeved on the connecting rod, the upper end of the connecting spring acts on the mounting seat, and the lower end acts on the connecting sleeve; the elastic force of the connecting spring urges the connecting sleeve to move downward; the connecting sleeve and the front end electromagnet are connected through a ball head bearing, and the ball head bearing can support the multi-angle swing of the front end electromagnet.

[0018] Preferably, the rear end adsorption device includes a fixed seat, rear end electromagnets arranged on the fixed seat, and a rotation driving mechanism for driving the fixed seat to rotate. Among them, the fixed seat is rotatably connected to the support through a rotating shaft; the rear end electromagnets are in multiple groups, and the multiple groups of rear end electromagnets are arranged at equal angles along the circumferential direction of the fixed seat; the rotation driving mechanism includes a rotation motor, the rotation motor is installed on the support, and the main shaft of the rotation motor is connected to the rotating shaft through a gear transmission mechanism.

[0019] Preferably, a first rotating seat is arranged on the support, and the first rotating seat is rotatably connected to the support. Among them, the rotation center of the rotation connection is located on one side of the support close to the detection device and on one side of the first rotating seat close to the detection device; the telescopic driving device is arranged on one side of the first rotating seat close to the detection device, and the telescopic driving device includes a through motor and a linear lead screw. Among them, the through motor is installed on the first rotating seat, and after the linear lead screw passes through the through motor, one end of it is connected to the mounting seat.

[0020] Preferably, the telescopic driving device further includes two groups of linear guiding mechanisms arranged on both sides of the through motor. Each group of linear guiding mechanisms includes a guide rod and a guide sleeve. Among them, the guide sleeve is installed on the first rotating seat, one end of the guide rod passes through the guiding hole on the guide sleeve and is connected to the mounting seat, and a limiting portion is arranged at the other end.

[0021] Preferably, the lifting driving device includes a front end driving mechanism for driving the front end adsorption device to perform lifting motion and a rear end driving mechanism for driving the rear end adsorption device to perform lifting motion.

[0022] Preferably, the front-end drive mechanism includes a lifting motor and a lifting lead screw transmission mechanism. Among them, a connecting shaft is provided at an end of the first rotating seat away from the detection device, and both sides of the connecting shaft extend into the first rotating seat respectively; the first rotating seat is provided with first limiting grooves on both sides of the connecting shaft, and both ends of the connecting shaft extend into the first limiting grooves respectively; one end of the lifting lead screw in the lifting lead screw transmission mechanism is connected to the main shaft of the lifting motor, and the other end vertically passes through the middle of the connecting shaft. An internal thread hole matching the external thread of the lifting lead screw is provided in the middle of the connecting shaft, and the internal thread hole forms the lifting lead screw nut in the lifting lead screw transmission mechanism.

[0023] Preferably, the rear-end drive mechanism includes a lever mechanism and a support mechanism, among which,

[0024] The support mechanism includes a support seat and support members arranged on both sides of the support seat. Among them, the support members include wheel seats and traveling wheels arranged on the wheel seats. Among them, the wheel seats are connected to the support seat through support rods. The lower end of the support rod is connected to the wheel seat, and the upper end vertically passes through the support seat and is connected to the limiting plate. The support seat is provided with a guiding groove at a corresponding position of the support rod, and the guiding groove enables the support rod to slide vertically; the diameter of the limiting plate is larger than the diameter of the guiding groove; a compression spring is also sleeved on the support rod, the upper end of the compression spring acts on the support seat, and the lower end acts on the wheel seat; the elastic force of the compression spring causes the traveling wheels to press downward against the wall body; an avoidance groove is provided at a corresponding position of the support seat and the wheel seat;

[0025] The lever mechanism includes a second rotating seat. A hinge seat is provided on the support seat, and the middle of the second rotating seat is hinged on the hinge seat. One end of the second rotating seat is connected to the connecting shaft, and the other end is connected to the support seat; among them, the second rotating seat is provided with a second limiting groove at a corresponding position of the connecting shaft, and the connecting shaft passes through the second limiting groove; the middle of the support seat is rod-shaped, and the second rotating seat is provided with a third limiting groove at a corresponding position of the support seat, and the middle of the support seat is located in the third limiting groove.

[0026] A risk assessment method for atmospheric storage tanks applying the above-mentioned defect parameter automatic detection system includes the following steps:

[0027] (1) The automatic defect parameter detection system uses acoustic emission sensors to detect the defect parameters of the atmospheric storage tank. Among them, the crawling device drives the detection device to move on the wall of the atmospheric storage tank, and the acoustic emission sensors in the detection device are used to detect the corrosion data of the atmospheric storage tank, and the detected data is transmitted to the control and processing device by means of wired transmission or wireless transmission; the control and processing device analyzes and calculates the data information to obtain the defect parameters of the atmospheric storage tank, and the defect parameters include the bottom plate thickness and wall plate thickness of the atmospheric storage tank during detection; the control and processing device further uploads the defect parameters to the database of the atmospheric storage tank risk assessment system;

[0028] (2) Input the basic parameters of the atmospheric storage tank to be evaluated into the atmospheric storage tank risk assessment system and store them in the database. The basic data includes the storage tank size specifications, the medium contained, the design pressure and temperature, the operating pressure and temperature, the volume, the bottom plate material, the wall plate material, and the commissioning time;

[0029] (3) The atmospheric storage tank risk assessment system automatically calculates the risk level of the atmospheric storage tank through the established risk assessment calculation model, and at the same time sends the risk assessment situation to the user. Among them, the calculation steps of the risk assessment calculation model include:

[0030] (3-1) Calculate the failure probability F(t) of the atmospheric storage tank:

[0031] F(t) = F G ×D f-total ×F M ;

[0032] In the formula: F G is the average failure probability; D f-total is the total loss coefficient; F M is the average failure probability;

[0033] (3-2) Divide the calculated failure probability into failure possibility levels as follows:

[0034] Level 1: 0.00000 < F(t) ≤ 0.00001;

[0035] Level 2: 0.00001 < F(t) ≤ 0.00010;

[0036] Level 3: 0.00100 < F(t) ≤ 0.01000;

[0037] Level 4: 0.01000 < F(t) ≤ 0.10000;

[0038] Level 5: 0.10000 < F(t) ≤ 1.00000;

[0039] (3-3) Calculate the failure consequence C(t) of the atmospheric storage tank, including the following steps;

[0040] S1. Determine the representative fluid for leakage and its related properties, where the related properties include fluid density and viscosity;

[0041] S2. Select the size of the leakage hole;

[0042] S3. Calculate the discharge rate;

[0043] S4. Estimate the total leakage amount and determine the leakage type;

[0044] S5. Estimate the influence of the detection and isolation system on the leakage amount;

[0045] S6. Determine the final leakage rate and leakage amount;

[0046] S7. Calculate the failure consequence C(t);

[0047] (3-4) Divide the failure consequence level according to the calculated failure consequence, and the division is as follows:

[0048] Level A: C(t) ≤ Q;

[0049] Level B: Q < C(t) ≤ 10Q;

[0050] Level C: 10Q < C(t) ≤ 100Q;

[0051] Level D: 100Q < C(t) ≤ 1000Q;

[0052] Level E: 1000Q < C(t) ≤ 10000Q;

[0053] (3-5) Determine the risk level F(t) through the two-dimensional matrix of the failure probability level and the failure consequence level, and divide it into high risk, medium-high risk, medium risk, and low risk;

[0054] (3-6) The atmospheric storage tank risk assessment system sends the risk level and the maintenance suggestions corresponding to the risk level to the enterprise user.

[0055] The present invention has the following beneficial effects compared with the prior art:

[0056] 1. The defect parameter automatic detection system of the atmospheric storage tank of the present invention drives the detection device to move on the wall of the atmospheric storage tank through the crawling device, detects the corrosion degree of the wall of the atmospheric storage tank through the acoustic emission sensor in the detection device, and transmits the detected data to the control processing device, and the control processing device automatically calculates the defect parameters of the atmospheric storage tank in combination with the existing national standards.

[0057] 2. The automatic defect parameter detection system for atmospheric storage tanks of the present invention uses acoustic emission detection, which can detect the atmospheric storage tanks without opening the tank, thus avoiding shutdown detection and minimizing the losses of enterprises.

[0058] 3. The automatic defect parameter detection system for atmospheric storage tanks of the present invention drives the detection device to move on the wall of the atmospheric storage tank through a crawling device, so as to realize the corrosion detection of multiple positions on the wall of the atmospheric storage tank. In this way, a set of detection devices can be used to complete the corrosion detection of the entire wall of the atmospheric storage tank, and the detection cost is lower.

[0059] 4. The risk assessment method for atmospheric storage tanks of the present invention calculates the defect data obtained by the automatic defect parameter detection system, and combines other information of the atmospheric storage tank (such as service life, use environment, etc.), and automatically conducts a risk assessment on the atmospheric storage tank according to the existing national standards, and calculates the risk level of the atmospheric storage tank.

[0060] 5. The risk assessment method for atmospheric storage tanks of the present invention establishes a basic database for risk assessment analysis, programs the risk-based inspection standards for atmospheric storage tanks, and after inputting relevant storage tank operation parameters, will select appropriate inspection strategies according to the risk distribution and damage failure mechanism of each part of the storage tank, and feedback the evaluation results to the user in the form of a three-dimensional risk distribution map of the storage tank, greatly reducing the difficulty of the inspection personnel in applying the risk assessment (RBI) of the storage tank; for the subsequent inspection personnel to combine the equipment usage situation and the remaining service life of the equipment, give the inspection cycle, extension inspection suggestions and production management suggestions, saving costs, shortening the construction period and reducing risks for the enterprise to a certain extent, effectively ensuring the safe operation of the storage tank, and having great value for carrying out the risk-based inspection (RBI) work of in-service atmospheric storage tanks. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a flow chart of the risk assessment method for atmospheric storage tanks of the present invention.

[0062] Figure 2 is a calculation flow chart of the failure consequence.

[0063] Figure 3 is a two-dimensional matrix diagram of the failure probability level and the failure consequence level.

[0064] Figure 4 is a structural block diagram of the automatic defect parameter detection system for atmospheric storage tanks of the present invention.

[0065] Figure 5 is a detection flow chart of the automatic defect parameter detection system for atmospheric storage tanks of the present invention.

[0066] Figures 6 - 10Schematic structural diagram of the automatic defect parameter detection system for the atmospheric storage tank of the present invention, where Figures 6 - 8 are schematic three-dimensional structural diagrams from three different perspectives, Figure 9 is the front view, Figure 10 is the top view.

[0067] Figure 11 is the cross-sectional view of the front-end adsorption device.

[0068] Figure 12 and Figure 13 are schematic structural diagrams when the telescopic drive device is not working and the lifting drive device drives the front-end adsorption device to lift, where Figure 12 is the schematic three-dimensional structure diagram, Figure 13 is the front view.

[0069] Figure 14 and Figure 15 are schematic structural diagrams when the telescopic drive device is working, where Figure 14 is the schematic three-dimensional structure diagram, Figure 15 is the front view.

[0070] Figure 16 and Figure 17 are schematic structural diagrams when the lifting drive device drives the front-end adsorption device to press tightly against the wall body, where Figure 16 is the schematic three-dimensional structure diagram, Figure 17 is the front view.

[0071] Figure 18 and Figure 19 are schematic structural diagrams when the lifting drive device drives the rear-end adsorption device to lift, where Figure 18 is the schematic three-dimensional structure diagram, Figure 19 is the front view. Detailed implementation manners

[0072] The present invention will be further described in detail below in conjunction with embodiments and the accompanying drawings, but the implementation manners of the present invention are not limited thereto.

[0073] Refer to Figures 1 - 19 , the automatic defect parameter detection system for the atmospheric storage tank of the present invention includes a detection device, a crawling device for driving the detection device to move on the wall body of the atmospheric storage tank, a data communication device, and a control and processing device.

[0074] Refer to Figures 1 - 19, the detection device includes a mounting base 9 and an acoustic emission sensor 1 disposed on the mounting base 9. The acoustic emission sensor 1 is used to detect the corrosion data of the wall of the atmospheric storage tank. Additionally, a vertical driving mechanism for driving the acoustic emission sensor 1 to move vertically and a vertical guiding mechanism for guiding the vertical movement of the acoustic emission sensor 1 are provided between the mounting base 9 and the acoustic emission sensor 1. Among them, the acoustic emission sensor 1 is mounted on the sensor seat 2; the vertical driving mechanism is mounted on the mounting base 9, and this vertical driving mechanism adopts a driving method combining a vertical motor 7 and a vertical screw drive mechanism. Among them, the vertical motor 7 is mounted on the mounting base 9, and the vertical screw 6 in the vertical screw drive mechanism is connected to the main shaft of the vertical motor 7; the vertical screw nut 5 in the vertical screw drive mechanism is connected to the vertical slider 4 in the vertical guiding mechanism, and the vertical slide rail 3 in the vertical guiding mechanism is mounted on the mounting base 9; the sensor seat 2 is mounted on the vertical slider 4; through the above settings, the vertical motor 7 drives the vertical screw 6 to rotate, thereby driving the acoustic emission sensor 1 to move vertically. In this way, during the process of the crawling device driving the detection device to move, by adjusting the height position of the acoustic emission sensor 1, the interference between the acoustic emission sensor 1 and the wall of the atmospheric storage tank can be avoided; additionally, the acoustic emission sensor 1 can be rotatably connected to the sensor seat 2, and a motor or a servo is used to drive the acoustic emission sensor 1 to swing, thereby changing the detection angle of the acoustic emission sensor 1, which is beneficial to increasing the detection range of the acoustic emission sensor 1.

[0075] See Figures 1 - 19 , the crawling device includes a support 14, a front adsorption device 8, a rear adsorption device 16, a telescopic driving device, and a lifting driving device disposed on the support 14. Among them, the front adsorption device 8 is disposed on the mounting base 9; the rear adsorption device 16 is disposed on the support 14; the telescopic driving device is mounted on the support 14, and the working end of this telescopic driving device is connected to the mounting base 9 for driving the front adsorption device 8 to perform linear telescopic movement; the lifting driving device is used to drive the front adsorption device 8 and the rear adsorption device 16 to perform lifting movement independently.

[0076] See Figures 1 - 19 , the data communication device is used to upload the data information collected by the detection device to the control processing device and transmit the control instructions issued by the control processing device to the crawling device and the detection device; among them, the data communication device adopts a wireless communication method, such as Wi F i.

[0077] See Figures 1 - 19, the control and processing device is used to receive the data information uploaded by the detection device, and through analyzing and calculating the data information, realize the risk assessment of the wall of the atmospheric storage tank to obtain the defect parameters of the atmospheric storage tank. Among them, the control and processing device is a computer, and the computer calculates the corresponding defect parameters according to the existing defect parameter calculation methods; at the same time, the computer can also establish a corresponding calculation model by applying the calculated defect parameters according to the existing risk assessment methods, and retrieve the pre-stored data of the corresponding atmospheric storage tank stored in the database. The pre-stored data includes but is not limited to the service life of the atmospheric storage tank, the original wall thickness of the bottom plate or wall plate of the atmospheric storage tank, and the number of inspections; combining all the data of the atmospheric storage tank (including detection data), the computer automatically calculates the risk level of the atmospheric storage tank through the pre-established calculation model, and at the same time sends the risk assessment situation to the user.

[0078] See Figures 1 - 19 , the front adsorption device 8 includes front electromagnets 801 arranged on both sides of the vertical driving mechanism and a connecting member for connecting the front electromagnets 801 to the mounting seat 9. Among them, during the power-on process, the front electromagnets 801 are elastically pressed against the wall of the atmospheric storage tank; the connecting member includes a connecting rod 806, a connecting sleeve 803, and a connecting spring 807 arranged between the connecting rod 806 and the connecting sleeve 803. Among them, the upper end of the connecting rod 806 is connected to the mounting seat 9, and the lower end extends into the connecting sleeve 803; a connecting channel for the vertical sliding of the connecting rod 806 is arranged in the connecting sleeve 803, and the lower end of the connecting channel communicates with the inner cavity 804 of the connecting sleeve 803, and the diameter of the inner cavity 804 is larger than the diameter of the connecting channel; the lower end of the connecting rod 806 passes through the connecting channel and is connected to a limiting block 805 located in the inner cavity 804, and the diameter of the limiting block 805 is larger than the diameter of the connecting channel, so as to prevent the connecting sleeve 803 from separating from the connecting rod 806; the connecting spring 807 is sleeved on the connecting rod 806, the upper end of the connecting spring 807 acts on the mounting seat 9, and the lower end acts on the connecting sleeve 803; the elastic force of the connecting spring 807 urges the connecting sleeve 803 to press down on the wall of the atmospheric storage tank; the connecting sleeve 803 and the front electromagnet 801 are connected through a ball head bearing 802, and the ball head bearing 802 can support the multi-angle swing of the front electromagnet 801.

[0079] See Figures 1 - 19, the rear adsorption device 16 includes a fixed seat 161, a rear electromagnet 162 disposed on the fixed seat 161, and a rotation driving mechanism for driving the fixed seat 161 to rotate. Among them, the fixed seat 161 is rotatably connected to the support 14 through a rotating shaft; the rear electromagnets 162 are multiple groups, and the multiple groups of rear electromagnets 162 are arranged at equal angles along the circumferential direction of the fixed seat 161; the rotation driving mechanism includes a rotation motor 24, the rotation motor 24 is installed on the support 14, and the main shaft of the rotation motor 24 is connected to the rotating shaft through a gear transmission mechanism 15. By setting the above structure, the crawling device can not only move linearly, but also turn; specifically: before or after the front adsorption device 8 moves forward, the rotation motor 24 drives the gear transmission mechanism 15 to rotate. Since the rear adsorption device 16 has adsorbed on the wall body, under the reaction force, the support 14 above the fixed seat 161 and each module on the support 14 will rotate around the rotating shaft. Among them, the rotation angle is flexibly selected according to the actual situation. When the forward direction of the front adsorption device 8 is adjusted, the telescopic driving device drives the front adsorption device 8 to continue the crawling action.

[0080] In addition, in this embodiment, the rear electromagnets 162 are three groups, and the included angle between two adjacent groups of rear electromagnets 162 among the three groups of rear electromagnets 162 is 120 degrees; by adopting this setting method, it is beneficial to ensure the stability of the crawling device during the crawling process.

[0081] See Figures 1 - 19 , a first rotating seat 11 is arranged on the support 14, the first rotating seat 11 is rotatably connected to the support 14, and the rotation center of the rotational connection is located on one side of the support 14 close to the detection device and on one side of the first rotating seat 11 close to the detection device; the telescopic driving device is arranged on one side of the first rotating seat 11 close to the detection device, and the telescopic driving device includes a through motor 10 and a linear lead screw 13. Among them, the through motor 10 is installed on the first rotating seat 11, and after the linear lead screw 13 passes through the through motor 10, one end of the linear lead screw 13 is connected to the mounting seat 9. By driving the linear lead screw 13 to rotate through the through motor 10, the linear lead screw 13 is driven to perform a linear motion, so as to drive the mounting seat 9 connected to the linear lead screw 13 to perform a linear motion. In addition to this implementation method, the telescopic driving device can also adopt the driving methods of a linear motor or an electric push rod.

[0082] See Figures 1 - 19, the telescopic driving device further includes two sets of linear guiding mechanisms 12 arranged on both sides of the through motor 10. Each set of linear guiding mechanisms 12 includes a guide rod and a guide sleeve. Among them, the guide sleeve is installed on the first rotating seat 11. One end of the guide rod passes through the guiding hole on the guide sleeve and is connected to the mounting seat 9, and a limiting portion can be provided at the other end. By providing the linear guiding mechanism 12, the linear motion of the mounting seat 9 can be guided, which is beneficial to ensuring the motion accuracy of the front end suction device 8, thereby ensuring the motion accuracy of the crawling device. In addition, the function of the added limiting portion is to limit the maximum telescopic stroke of the telescopic driving device, that is, to limit the maximum crawling stroke of the crawling device for a single time.

[0083] See Figures 1 - 19 , the lifting driving device includes a front end driving mechanism for driving the front end suction device 8 to lift and a rear end driving mechanism for driving the rear end suction device 16 to lift.

[0084] See Figures 1 - 19, the front-end drive mechanism includes a lifting motor and a lifting lead screw transmission mechanism 25. Among them, at the end of the first rotating seat 11 far from the detection device, a connecting shaft 26 is provided. Both sides of the connecting shaft 26 extend into the first rotating seat 11 respectively; at both sides of the connecting shaft 26 on the first rotating seat 11, first limiting grooves 110 are provided. Both ends of the connecting shaft 26 extend into the first limiting grooves 110 respectively; one end of the lifting lead screw in the lifting lead screw transmission mechanism 25 is connected to the main shaft of the lifting motor, and the other end vertically passes through the middle of the connecting shaft 26. An internal threaded hole matching the external thread of the lifting lead screw is provided in the middle of the connecting shaft 26, and the internal threaded hole constitutes the lifting lead screw nut in the lifting lead screw transmission mechanism 25. Through the above settings, when it is necessary to drive the front-end adsorption device 8 to move vertically, the lifting lead screw is driven to rotate by the lifting motor, thereby driving the connecting shaft 26 to move vertically. And because the part of the first connecting seat close to the detection device is hinged on the support 14, therefore, the first connecting seat is equivalent to a "lever mechanism". In fact, the front-end drive mechanism is located on one side of the lever mechanism, while the telescopic drive device, the detection device, and the front-end adsorption device 8 are located on the other side of the lever mechanism (wherein, because both the detection device and the front-end adsorption device 8 are connected through the mounting seat 9, and the mounting seat 9 is installed at the telescopic end of the telescopic drive device, therefore, both the detection device and the front-end adsorption device 8 can be regarded as being located on the other side of the lever mechanism); by the downward movement of the connecting shaft 26, the other side of the lever mechanism can be pulled downward, so that the detection device and the front-end adsorption device 8 swing upward, thereby separating the front-end adsorption device 8 from the wall body; at the same time, when the lifting drive mechanism drives the connecting shaft 26 to move upward, the detection device and the front-end adsorption device 8 swing downward, so that the front-end adsorption device 8 adsorbs on the wall body. And because the first limiting grooves 110 are provided on both sides of the first rotating seat 11 and the connecting shaft 26, the first limiting grooves 110 can be set as oblong, which can not only prevent the connecting shaft 26 from being stuck during the vertical movement process, but also the length of the first limiting grooves 110 determines the vertical movement stroke of the connecting shaft 26, which is beneficial to limiting the swing range of the detection device and the front-end adsorption device 8. In addition, because the rotation center of the first rotating seat 11 is set on the side of the first rotating seat 11 close to the detection device; that is to say, the "long rod" in the lever mechanism is connected to the connecting shaft 26, which also plays a role in saving effort and is beneficial to reducing the power of the lifting motor.

[0085] See Figures 1 - 19 , the rear-end drive mechanism includes a lever mechanism and a support mechanism, among which,

[0086] The support mechanism includes a support base 19 and support members arranged on both sides of the support base 19. Among them, the support members include wheel seats 22 and traveling wheels 23 arranged on the wheel seats 22. Among them, the wheel seats 22 and the support base 19 are connected by support rods 20. The lower end of the support rod 20 is connected to the wheel seat 22, and the upper end vertically passes through the support base 19 and is connected to the limit plate. The support base 19 is provided with a guide groove at a position corresponding to the support rod 20, and the guide groove enables the support rod 20 to slide vertically; the diameter of the limit plate is larger than the diameter of the guide groove; a compression spring 21 is also sleeved on the support rod 20. The upper end of the compression spring 21 acts on the support base 19, and the lower end acts on the wheel seat 22; the elastic force of the compression spring 21 urges the traveling wheels 23 to press downward against the wall body; the support 14 is provided with an avoidance groove at a position corresponding to the wheel seat 22;

[0087] The lever mechanism includes a second rotating seat 17. The support 14 is provided with a hinge seat 18. The middle part of the second rotating seat 17 is hinged on the hinge seat 18. One end of the second rotating seat 17 is connected to the connecting shaft 26, and the other end is connected to the support base 19; among them, the second rotating seat 17 is provided with a second limit groove 172 at a position corresponding to the connecting shaft 26, and the connecting shaft 26 passes through the second limit groove 172; the middle part of the support base 19 is rod-shaped, and the second rotating seat 17 is provided with a third limit groove 171 at a position corresponding to the support base 19, and the middle part of the support base 19 is located in the third limit groove 171.

[0088] With the above settings, while the lifting motor drives the connecting shaft 26 to move vertically, the connecting shaft 26 also drives one end of the second rotating seat 17 to swing vertically, thereby driving the other end of the second connecting seat to swing vertically. Since the other end of the second rotating seat 17 is connected to the support seat 19, when the second rotating seat 17 rotates around the hinge seat 18, the support mechanism will also move up and down; among them, the up and down movement of the support mechanism is synchronized with the up and down movement of the front end suction device 8, that is, when the support mechanism moves downward, correspondingly, the front end suction device 8 also moves downward; vice versa; in this way, when it is necessary to ensure that the rear end suction device 16 crosses an obstacle, the lifting motor drives the connecting shaft 26 to move upward through the lifting screw transmission mechanism 25, and through the two sets of lever mechanisms on both sides, the front end suction device 8 and the support mechanism move downward at the same time, so that the rear end suction device 16 located in the middle is gradually supported by the front end suction device 8 and the support mechanism, making the rear end suction device 16 suspended. In this way, driven by the crawling device, the rear end suction device 16 can cross the obstacle. When it is necessary to ensure that the front end suction device 8 crosses an obstacle, only the lifting motor needs to drive the connecting shaft 26 to move downward through the lifting screw transmission mechanism 25, and through the two sets of lever mechanisms on both sides, the front end suction device 8 and the support mechanism move upward at the same time, and then through the drive of the telescopic drive device, the front end suction device 8 crosses the obstacle, and then the lifting motor drives the lifting screw transmission mechanism 25 to reset, so that the front end suction device 8 and the support mechanism on both sides are reset. In addition, through the above settings, the front end drive mechanism and the rear end drive mechanism can share a set of lifting drive mechanisms, which is beneficial to reducing the manufacturing cost and simplifying the structure. In addition, a corresponding lifting guide mechanism 27 can be provided for the lifting drive mechanism. The lifting guide mechanism 27 can be two groups. The two groups of lifting guide mechanisms 27 are respectively located on both sides of the lifting screw. Each group of lifting guide mechanisms includes a guide seat provided on the support 14 and a guide rod cooperating with the guide seat. Among them, the upper end of the guide rod is connected to the connecting shaft 26. If the guide rod needs to pass through the first rotating seat 11 or the second rotating seat 17, an avoidance hole needs to be provided on the first rotating seat 11 and the second rotating seat 17. The avoidance hole is oblong, and the extending direction is the same as the extending directions of the first limiting groove 110, the second limiting groove 172 and the third limiting groove 171, so as to ensure that the guide rod will not interfere with the first rotating seat 11 or the second rotating seat 17 during the lifting movement.

[0089] The risk assessment method for atmospheric storage tanks of the present invention is completed by an atmospheric storage tank risk assessment system, which consists of computer hardware and related software, specifically including an information input module, a wireless communication module, a database for storing basic data of atmospheric storage tanks, and a risk assessment calculation model. Among them, the information input module is used to input the basic data of atmospheric storage tanks into the assessment system, and these basic data are the parameters required in the risk assessment process; the wireless communication module is used for information exchange with the outside, including receiving the current defect data of the storage tank transmitted by the defect parameter automatic detection system of the atmospheric storage tank, and sending the calculated risk assessment structure to the user. The risk assessment calculation model is used to perform specific calculation processes according to the basic data of the storage tank and the detected defect data, replacing manual calculation in the prior art. The risk assessment calculation model programs the calculation processes of current relevant assessment standards, and the system automatically calculates according to the storage tank parameters, thereby realizing the automation of the assessment process.

[0090] See Figures 1 - 19 , the risk assessment method for atmospheric storage tanks of the present invention includes the following steps:

[0091] (1). The defect parameter automatic detection system uses acoustic emission sensors to detect the defect parameters of the atmospheric storage tank. Among them, the crawling device drives the detection device to move on the wall of the atmospheric storage tank, and the acoustic emission sensors in the detection device are used to detect the corrosion data of the atmospheric storage tank, and the detected data is transmitted to the control and processing device by wired transmission or wireless transmission; the control and processing device analyzes and calculates the data information to obtain the defect parameters of the atmospheric storage tank, and the defect parameters include the bottom plate thickness and wall plate thickness of the atmospheric storage tank during detection; the control and processing device further uploads the defect parameters to the database of the atmospheric storage tank risk assessment system.

[0092] (2). The information input module inputs the basic parameters of the atmospheric storage tank to be evaluated into the atmospheric storage tank risk assessment system and stores them in the database. The basic data includes the storage tank size specifications, the medium contained, the design pressure and temperature, the operating pressure and temperature, the volume, the bottom plate material, the wall plate material, and the commissioning time.

[0093] (3). The atmospheric storage tank risk assessment system automatically calculates the risk level of the atmospheric storage tank through the established risk assessment calculation model, and at the same time sends the risk assessment situation to the user. Among them, the calculation steps of the risk assessment calculation model include:

[0094] (3-1). Calculate the failure probability F(t) of the atmospheric storage tank:

[0095] F(t) = F G ×D f-total ×FM ;

[0096] Where: F G is the average failure probability; D f-total is the total loss coefficient; F M is the average failure probability; The calculation formulas for the above parameters can be calculated with reference to existing national standards, such as GB / T 26610.1, GB / T 26610.2, and GB / T 26610.5;

[0097] (3-2) Divide the calculated failure probability into failure possibility levels as follows:

[0098] Level 1: 0.00000 < F(t) ≤ 0.00001;

[0099] Level 2: 0.00001 < F(t) ≤ 0.00010;

[0100] Level 3: 0.00100 < F(t) ≤ 0.01000;

[0101] Level 4: 0.01000 < F(t) ≤ 0.10000;

[0102] Level 5: 0.10000 < F(t) ≤ 1.00000;

[0103] (3-3) Calculate the failure consequence C(t) of the atmospheric storage tank, including the following steps;

[0104] S1. Determine the representative fluid for leakage and its related properties, where the related properties include fluid density and viscosity;

[0105] S2. Select the size of the leakage hole;

[0106] S3. Calculate the discharge rate;

[0107] S4. Estimate the total leakage amount and determine the leakage type;

[0108] S5. Estimate the influence of the detection and isolation system on the leakage amount;

[0109] S6. Determine the final leakage rate and leakage amount;

[0110] S7. Calculate the failure consequence C(t);

[0111] (3-4) Divide the calculated failure consequence into failure consequence levels as follows:

[0112] Level A: C(t) ≤ Q;

[0113] Level B: Q < C(t) ≤ 10Q;

[0114] Level C: 10Q < C(t) ≤ 100Q;

[0115] Level D: 100Q < C(t) ≤ 1000Q;

[0116] Level E: 1000Q < C(t) ≤ 10000Q;

[0117] (3 - 5) Determine the risk magnitude F(t) through the two - dimensional matrix of the failure probability level and the failure consequence level, and classify it into high - risk, medium - high - risk, medium - risk, and low - risk;

[0118] (3 - 6) The atmospheric storage tank risk assessment system transmits the risk level and the maintenance suggestions corresponding to the risk level to the enterprise user through the wireless communication module.

[0119] The specific details of the above - mentioned calculation process can be calculated with reference to the corresponding steps and formulas in "National Standard of the People's Republic of China - GB / T30578 - 2014 - Risk - Based Inspection and Evaluation of Atmospheric Storage Tanks".

[0120] In addition, the risk assessment method for atmospheric storage tanks of the present invention can also establish a basic database for risk assessment analysis, program the risk - based inspection standards for atmospheric storage tanks. After inputting relevant storage tank operation parameters, it will select a suitable inspection strategy according to the risk distribution and damage failure mechanism of each part of the storage tank, and feedback the evaluation results to the user in the form of a three - dimensional risk distribution map of the storage tank, greatly reducing the difficulty of the inspection personnel in applying the risk assessment (RBI) of the storage tank; for subsequent inspection personnel to give inspection cycles, extended inspection suggestions and production management suggestions in combination with the equipment usage situation and the remaining service life of the equipment, saving costs, shortening the construction period, and reducing risks for the enterprise to a certain extent, and effectively ensuring the safe operation of the storage tank, which has great value for carrying out risk - based inspection (RBI) work on in - service atmospheric storage tanks.

[0121] The above is a preferred embodiment of the present invention, but the embodiments of the present invention are not limited by the above content. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. An automatic defect parameter detection system for atmospheric storage tanks, characterized in that, It includes a detection device, a crawling device for driving the detection device to move on the wall of an atmospheric storage tank, a data communication device, and a control and processing device. Among them, the detection device includes a mounting base and an acoustic emission sensor arranged on the mounting base. Among them, the acoustic emission sensor is used to detect the corrosion data of the wall of the atmospheric storage tank; the crawling device includes a support, a front-end adsorption device, a rear-end adsorption device, a telescopic driving device, and a lifting driving device arranged on the support. Among them, the front-end adsorption device is arranged on the mounting base; the rear-end adsorption device is arranged on the support; the telescopic driving device is installed on the support, and the working end of the telescopic driving device is connected to the mounting base and is used to drive the front-end adsorption device to perform linear telescopic motion; the lifting driving device is used to drive the front-end adsorption device and the rear-end adsorption device to perform lifting motion separately; the data communication device is used to upload the data information collected by the detection device to the control and processing device and transmit the control instructions issued by the control and processing device to the crawling device and the detection device; the control and processing device is used to receive the data information uploaded by the detection device and obtain the defect parameters of the atmospheric storage tank by analyzing and calculating the data information; a vertical driving mechanism for driving the acoustic emission sensor to perform vertical motion and a vertical guiding mechanism for guiding the vertical motion of the acoustic emission sensor are further arranged between the mounting base and the acoustic emission sensor. Among them, the vertical driving mechanism is installed on the mounting base, and the vertical driving mechanism adopts a driving method combining a vertical motor and a vertical screw transmission mechanism. Among them, the vertical motor is installed on the mounting base, and the vertical screw in the vertical screw transmission mechanism is connected to the main shaft of the vertical motor; the vertical screw nut in the vertical screw transmission mechanism is connected to the vertical slider in the vertical guiding mechanism, and the vertical slide rail in the vertical guiding mechanism is installed on the mounting base; the acoustic emission sensor is installed on the vertical slider; The front adsorption device includes front electromagnets arranged on both sides of the vertical driving mechanism and a connecting member for connecting the front electromagnets to the mounting seat. Among them, the connecting member includes a connecting rod, a connecting sleeve, and a connecting spring arranged between the connecting rod and the connecting sleeve. Among them, the upper end of the connecting rod is connected to the mounting seat, and the lower end extends into the connecting sleeve; a connecting channel for the vertical sliding of the connecting rod is arranged in the connecting sleeve, and the lower end of the connecting channel communicates with the inner cavity of the connecting sleeve, and the diameter of the inner cavity is larger than that of the connecting channel; the lower end of the connecting rod passes through the connecting channel and is connected to a limiting block located in the inner cavity, and the diameter of the limiting block is larger than that of the connecting channel; the connecting spring is sleeved on the connecting rod, the upper end of the connecting spring acts on the mounting seat, and the lower end acts on the connecting sleeve; the elastic force of the connecting spring urges the connecting sleeve to move downward; the connecting sleeve and the front electromagnet are connected through a ball head bearing, and the ball head bearing can support the multi-angle swing of the front electromagnet; The rear adsorption device includes a fixed seat, rear electromagnets arranged on the fixed seat, and a rotation driving mechanism for driving the fixed seat to rotate. Among them, the fixed seat is rotatably connected to the support through a rotating shaft; the rear electromagnets are in multiple groups, and the multiple groups of rear electromagnets are arranged at equal angles along the circumferential direction of the fixed seat; the rotation driving mechanism includes a rotation motor, the rotation motor is installed on the support, and the main shaft of the rotation motor is connected to the rotating shaft through a gear transmission mechanism; A first rotating seat is arranged on the support, and the first rotating seat is rotatably connected to the support. Among them, the rotation center of the rotation connection is located on one side of the support close to the detection device and on one side of the first rotating seat close to the detection device; the telescopic driving device is arranged on one side of the first rotating seat close to the detection device, and the telescopic driving device includes a through motor and a linear lead screw. Among them, the through motor is installed on the first rotating seat, and after the linear lead screw passes through the through motor, one end of it is connected to the mounting seat; The lifting driving device includes a front driving mechanism for driving the front adsorption device to perform lifting motion and a rear driving mechanism for driving the rear adsorption device to perform lifting motion; The front driving mechanism includes a lifting motor and a lifting lead screw transmission mechanism. Among them, a connecting shaft is arranged at the end of the first rotating seat far from the detection device, and both sides of the connecting shaft extend into the first rotating seat respectively; first limiting grooves are arranged on both sides of the first rotating seat where the connecting shaft is located, and both ends of the connecting shaft extend into the first limiting grooves respectively; one end of the lifting lead screw in the lifting lead screw transmission mechanism is connected to the main shaft of the lifting motor, and the other end vertically passes through the middle of the connecting shaft. An internal thread hole matching the external thread of the lifting lead screw is arranged in the middle of the connecting shaft, and the internal thread hole constitutes the lifting lead screw nut in the lifting lead screw transmission mechanism.

2. The automatic defect parameter detection system for atmospheric storage tanks according to claim 1, characterized in that The telescopic driving device further includes two sets of linear guiding mechanisms arranged on both sides of the through motor. Each set of linear guiding mechanisms includes a guide rod and a guide sleeve. Among them, the guide sleeve is installed on the first rotating seat, one end of the guide rod passes through the guiding hole on the guide sleeve and then is connected to the mounting seat, and a limiting portion is provided at the other end.

3. The automatic defect parameter detection system for atmospheric storage tanks according to claim 1, wherein, The rear-end driving mechanism includes a lever mechanism and a supporting mechanism. Among them, The supporting mechanism includes a supporting seat and supporting members arranged on both sides of the supporting seat. Among them, the supporting members include wheel seats and traveling wheels arranged on the wheel seats. Among them, the wheel seats are connected to the supporting seat through support rods. The lower end of the support rod is connected to the wheel seat, and the upper end vertically passes through the supporting seat and then is connected to a limiting plate. The supporting seat is provided with a guiding groove at a position corresponding to the support rod, and the guiding groove enables the support rod to slide vertically; the diameter of the limiting plate is larger than the diameter of the guiding groove; a compression spring is also sleeved on the support rod, the upper end of the compression spring acts on the supporting seat, and the lower end acts on the wheel seat; the elastic force of the compression spring causes the traveling wheels to press down tightly on the wall body; an avoidance groove is provided at the position of the support seat corresponding to the wheel seat; The lever mechanism includes a second rotating seat. A hinge seat is arranged on the support seat, and the middle part of the second rotating seat is hinged on the hinge seat. One end of the second rotating seat is connected to the connecting shaft, and the other end is connected to the supporting seat; among them, a second limiting groove is provided at the position of the second rotating seat corresponding to the connecting shaft, and the connecting shaft passes through the second limiting groove; the middle part of the supporting seat is rod-shaped, and a third limiting groove is provided at the position of the second rotating seat corresponding to the supporting seat, and the middle part of the supporting seat is located in the third limiting groove.

4. A risk assessment method for an automatic defect parameter detection system of an atmospheric storage tank according to any one of claims 1-3, characterized in that, Including the following steps: (1) The defect parameter automatic detection system uses acoustic emission sensors to detect the defect parameters of the atmospheric storage tank. Among them, the crawling device drives the detection device to move on the wall body of the atmospheric storage tank, and the acoustic emission sensors in the detection device are used to detect the corrosion data of the atmospheric storage tank, and the detected data obtained by the detection is transmitted to the control and processing device by means of wired transmission or wireless transmission; the control and processing device analyzes and calculates this data information to obtain the defect parameters of the atmospheric storage tank. The defect parameters include the bottom plate thickness and wall plate thickness of the atmospheric storage tank during detection; the control and processing device further uploads the defect parameters to the database of the atmospheric storage tank risk assessment system; (2) Input the basic data of the atmospheric storage tank to be evaluated into the atmospheric storage tank risk assessment system and store it in the database. The basic data includes the storage tank size specifications, the medium contained, the design pressure and temperature, the operating pressure and temperature, the volume, the bottom plate material, the wall plate material, and the commissioning time; (3) The atmospheric storage tank risk assessment system automatically calculates the risk level of the atmospheric storage tank through the established risk assessment calculation model, and at the same time sends the risk assessment situation to the user. Among them, the calculation steps of the risk assessment calculation model include: (3-1) Calculate the failure probability F(t) of the atmospheric storage tank: F(t) = F G × D f-total × F M ; Wherein: is the average failure probability; is the total loss coefficient; is the average failure probability; (3-2) Divide the calculated failure probability into failure possibility levels as follows: Level 1: ; Level 2: ; Level 3: ; Level 4: ; Level 5: ; (3-3) Calculate the failure consequence C(t) of the atmospheric storage tank, including the following steps: S1. Determine the representative fluid for leakage and its related properties, where the related properties include fluid density and viscosity; S2. Select the size of the leakage hole; S3. Calculate the discharge rate; S4. Estimate the total leakage amount and determine the leakage type; S5. Estimate the impact of the detection and isolation system on the leakage amount; S6. Determine the final leakage rate and leakage amount; S7. Calculate the failure consequence C(t); (3-4) Divide the failure consequence levels according to the calculated failure consequence as follows: Level A: ; Level B: ; Level C: ; Level D: ; Level E: ; (3-5) Determine the risk level through the two-dimensional matrix of the failure possibility level and the failure consequence level, and classify it into high risk, medium-high risk, medium risk, and low risk; (3-6) The atmospheric storage tank risk assessment system sends the risk level and the maintenance suggestions corresponding to the risk level to the enterprise user.

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