Method for chemical risk management by integrating leakage simulation analysis and property evaluation of vinyl chloride gas holder

Abstract

The invention relates to a chemical risk management method integrating leakage simulation analysis and property evaluation of a vinyl chloride gas holder, and aims to accurately predict and quantify the safety risk and potential economic loss after leakage of the vinyl chloride gas holder by using an advanced simulation technology and an economic evaluation means. According to the method, [Areal Location of Hazard] ALOHA simulation software approved by the industry is adopted, the gas diffusion process after vinyl chloride leakage is simulated in a high-precision mode, and in combination with a [Quantum Geographic Information System] QGIS (Quality Geographic Information System), visual display of data is carried out. On the basis, through comprehensive consideration of key factors such as physical and chemical characteristics, process environment parameters and leakage scale of vinyl chloride, hazard indexes of fire and explosion are scientifically calculated, and then possible economic losses are deduced. By constructing a set of comprehensive and quantitative risk assessment system, powerful support is provided for safety assessment of chemical equipment, and an important basis is provided for a management layer of a chemical enterprise to formulate scientific and effective safety strategies and risk control measures.

Description

Technical Field

[0001] The present invention relates to a method for chemical risk management that integrates vinyl chloride gas cabinet leakage simulation analysis and property assessment, in particular to a risk assessment method that combines ALOHA software, QGIS geographic information system, and comprehensive index evaluation method. Background Art

[0002] The storage and handling of hazardous chemicals is a critical process in the chemical industry, but it also presents numerous risks, most notably leaks and accidents. Gas leaks, particularly from vinyl chloride gas tanks, carry a high risk of fire and explosion, posing a serious threat to personnel and property safety.

[0003] While extensive research has focused on using ALOHA software to assess the risk of hazardous chemical leaks and spreads, these assessments often lack intuitiveness and appear rather abstract. This makes the results difficult for non-professionals to understand and fails to fully reflect the potential impact of an accident. Furthermore, traditional risk assessment methods often focus solely on the risk of leaks and spreads themselves, while ignoring other important comprehensive indicators, such as economic losses. Economic losses are a key indicator of accident consequences, directly reflecting the economic impact of an accident on a company. However, traditional risk assessment methods often fail to incorporate this metric into their assessment systems, resulting in an incomplete and incomplete assessment of the risks.

[0004] Therefore, existing technical means still have obvious shortcomings when dealing with risk assessment in the chemical industry, and a more complete and comprehensive method is needed to solve this problem. Summary of the Invention

[0005] This invention provides a risk assessment method that combines ALOHA with QGIS, calculates fire and explosion indices using relevant parameters, and uses economic losses to assess the risk level of accident consequences. This method includes an ALOHA module, a QGIS module, and a comprehensive index to assess the risk level. The ALOHA module analyzes risks such as leaks, fires, and explosions. The QGIS module maps the ALOHA output data into a geographic information system (GIS) to visualize and spatially analyze risks. The comprehensive index evaluates the safety of gasholders and the risk level of accident consequences using economic losses.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a method for integrating vinyl chloride gas tank leakage simulation analysis and property assessment for chemical risk management, comprising the following steps:

[0007] S1. Comprehensively collect relevant environmental parameters of vinyl chloride gas tanks, including but not limited to key information such as gas tank type, storage material characteristics, storage volume, etc., to provide a data basis for subsequent simulation analysis and risk assessment.

[0008] S2. Use ALOHA software to perform high-precision simulation of vinyl chloride gas tank leaks, accurately predict the diffusion range and degree of harm of toxic gases, and provide a basis for formulating effective emergency response measures.

[0009] S3. Using the QGIS geographic information system, the ALOHA simulation results were spatially processed and visualized to enhance the intuitiveness of the data and facilitate rapid understanding of the impact and severity of the leak.

[0010] S4. Accurately integrate ALOHA’s simulation data into the QGIS system to ensure close integration of simulation data with the actual environment, providing reliable support for risk assessment.

[0011] S5. Use the comprehensive index evaluation method, combine simulation data and collected information, evaluate the severity of the accident, and compile a summary table of hazard analysis of vinyl chloride gas tanks to provide comprehensive support for risk management.

[0012] Preferably, the S1 step is specifically as follows: combining the actual situation of the vinyl chloride chemical plant and the local atmospheric conditions, determining some main parameters required for the ALOHA software simulation, including information such as the leaked material, geographical location and atmospheric environment, so as to more intuitively reflect the diffusion situation after the vinyl chloride gas tank leaks.

[0013] Preferably, the step S2 is specifically as follows: using the acute exposure guidance concentration to divide the impact range of the toxic gas generated during the leakage of the vinyl chloride gas cabinet, and dividing it into three levels according to the severity of the impact of the toxic gas on humans.

[0014] Preferably, the S3 step is specifically as follows: The gas diffusion models provided by ALOHA include a Gaussian model for neutral or buoyant gases and a heavy gas diffusion model. When a vinyl chloride storage tank leaks at a specific pressure and temperature, it exhibits gas-liquid two-phase flow characteristics. Flash evaporation occurs near the leak port. The liquefied vinyl chloride rapidly evaporates, causing the temperature of the surrounding air to drop, forming a mixture with the air. The density of the mixed gas is greater than that of air, and the diffusion of the leaked vinyl chloride is affected by gravity, manifesting as heavy gas diffusion. Therefore, the heavy gas model is selected for analysis, and its mathematical expression is:

[0015]

[0016]

[0017]

[0018] Where: c is the mass concentration of the leaked substance, c0 is the mass concentration of the leaked substance at the center position m, b is the horizontal range width m; S y is the atmospheric level concentration ratio, Sz is the atmospheric vertical concentration ratio, α is the wind speed profile constant, Z0 is the wind speed profile height in m, u0 is the actual wind speed at Z0 height in m / s, u x is the actual wind speed in the positive direction of the x-axis in m / s.

[0019] Preferably, the S4 step is specifically as follows: after using QGIS to perform projection conversion, clipping and other processing on the layer of the area where the vinyl chloride gas tank is located, the threat area under the most favorable threat conditions obtained by ALOHA simulation is overlaid on the map.

[0020] Preferably, step S5 specifically includes: determining the material coefficient according to the material coefficient determination guide, determining the general and special hazard coefficients of the process unit using the fire and explosion hazard index table, and then calculating the total process unit hazard coefficient. The safety measure compensation coefficient is calculated using the process control compensation coefficient table, the material isolation safety compensation coefficient table, and the fire protection facility safety compensation coefficient table.

[0021] The hazard factor is determined by the hazard factor calculation diagram and the previously obtained process unit hazard factor. The ALOHA simulation results are analyzed to determine the impact radius of the leaked material, and then the property value in the leaked area is evaluated. The basic maximum possible property loss (PML) is calculated using the property value in the leaked area and the hazard factor, and the actual maximum possible property loss is calculated by combining the safety measures compensation factor. The calculated actual maximum possible property loss is used to assess the severity of the accident, and all collected data and analysis results are integrated to compile a summary table of the vinyl chloride gas tank hazard analysis. The specific formula is as follows:

[0022] Basic maximum possible property loss = property value in the leakage area × hazard coefficient

[0023] Actual maximum possible property loss = basic maximum possible property loss × safety measures compensation coefficient

[0024] The present invention provides a method for chemical risk management that integrates vinyl chloride gas cabinet leakage simulation analysis and property assessment, which has the following beneficial effects:

[0025] This paper provides a safety risk assessment method for vinyl chloride gas tanks. By combining ALOHA simulation software with the QGIS geographic information system, it assesses the spread of vinyl chloride leaks and the potential fire and explosion hazards. It also incorporates an economic loss evaluation metric to intuitively measure the severity of the accident and its impact on production equipment. This comprehensive, visual, and intuitive method can provide strong support for risk management in chemical companies. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The toxic range of vinyl chloride leakage and diffusion of the present invention;

[0027] Figure 2 The vapor cloud combustion range of the present invention;

[0028] Figure 3 The vapor cloud explosion range of the present invention;

[0029] Figure 4 This is a field fitting diagram of the toxic range of vinyl chloride leakage of the present invention;

[0030] Figure 5 This is a field fitting diagram of the vinyl chloride leakage combustion range of the present invention;

[0031] Figure 6 This is a field fitting diagram of the explosion range of vinyl chloride leakage of the present invention. DETAILED DESCRIPTION

[0032] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0033] Example 1:

[0034] The present invention provides a risk assessment method that combines ALOHA with QGIS, calculates fire and explosion indices through relevant parameters, and evaluates the risk level of accident consequences based on economic losses. The implementation method includes the following steps:

[0035] S1. Comprehensively collect relevant environmental parameters of vinyl chloride gas tanks, including but not limited to key information such as gas tank type, storage material characteristics, storage volume, etc., to provide a data basis for subsequent simulation analysis and risk assessment.

[0036] S2. Use ALOHA software to perform high-precision simulation of vinyl chloride gas tank leaks, accurately predict the diffusion range and degree of harm of toxic gases, and provide a basis for formulating effective emergency response measures.

[0037] S3. Using the QGIS geographic information system, the ALOHA simulation results were spatially processed and visualized to enhance the intuitiveness of the data and facilitate rapid understanding of the impact and severity of the leak.

[0038] S4. Accurately integrate ALOHA’s simulation data into the QGIS system to ensure close integration of simulation data with the actual environment, providing reliable support for risk assessment.

[0039] S5. Use the comprehensive index evaluation method, combine simulation data and collected information, evaluate the severity of the accident, and compile a summary table of hazard analysis of vinyl chloride gas tanks to provide comprehensive support for risk management.

[0040] Preferably, the S1 step is specifically as follows: combining the actual situation of the vinyl chloride chemical plant and the local atmospheric conditions, determining some main parameters required for the ALOHA software simulation, including information such as the leaked material, geographical location and atmospheric environment, so as to more intuitively reflect the diffusion situation after the vinyl chloride gas tank leaks.

[0041] Preferably, the step S2 is specifically as follows: using the acute exposure guidance concentration to divide the impact range of the toxic gas generated during the leakage of the vinyl chloride gas cabinet, and dividing it into three levels according to the severity of the impact of the toxic gas on humans.

[0042] Preferably, the S3 step is specifically as follows: The gas diffusion models provided by ALOHA include a Gaussian model for neutral or buoyant gases and a heavy gas diffusion model. When a vinyl chloride storage tank leaks at a specific pressure and temperature, it exhibits gas-liquid two-phase flow characteristics. Flash evaporation occurs near the leak port. The liquefied vinyl chloride rapidly evaporates, causing the temperature of the surrounding air to drop, forming a mixture with the air. The density of the mixed gas is greater than that of air, and the diffusion of the leaked vinyl chloride is affected by gravity, manifesting as heavy gas diffusion. Therefore, the heavy gas model is selected for analysis, and its mathematical expression is:

[0043]

[0044]

[0045]

[0046] Where: c is the mass concentration of the leaked substance, c0 is the mass concentration of the leaked substance at the center position m, b is the horizontal range width m; S y is the atmospheric level concentration ratio, S z is the atmospheric vertical concentration ratio, α is the wind speed profile constant, Z0 is the wind speed profile height in m, u0 is the actual wind speed at Z0 height in m / s, u x is the actual wind speed in the positive direction of the x-axis in m / s.

[0047] Preferably, the S4 step is specifically as follows: after using QGIS to perform projection conversion, clipping and other processing on the layer of the area where the vinyl chloride gas tank is located, the threat area under the most favorable threat conditions obtained by ALOHA simulation is overlaid on the map.

[0048] Preferably, step S5 specifically includes: 6. Determine the material coefficient according to the material coefficient determination guide, determine the general and special hazard coefficients of the process unit using the fire and explosion hazard index table, and then calculate the total process unit hazard coefficient. Calculate the safety measure compensation coefficient using the process control compensation coefficient table, the material isolation safety compensation coefficient table, and the fire protection facility safety compensation coefficient table.

[0049] The hazard factor is determined by the hazard factor calculation diagram and the previously obtained process unit hazard factor. The ALOHA simulation results are analyzed to determine the impact radius of the leaked material, and then the property value in the leaked area is evaluated. The basic maximum possible property loss (PML) is calculated using the property value in the leaked area and the hazard factor, and the actual maximum possible property loss is calculated by combining the safety measures compensation factor. The calculated actual maximum possible property loss is used to assess the severity of the accident, and all collected data and analysis results are integrated to compile a summary table of the vinyl chloride gas tank hazard analysis. The specific formula is as follows:

[0050] Basic maximum possible property loss = property value in the leakage area × hazard coefficient

[0051] Actual maximum possible property loss = basic maximum possible property loss × safety measures compensation coefficient

[0052] Using ALOHA software, the impact radius of the leaked material and the scope of the three impact areas of the vinyl chloride gas tank leakage were analyzed and determined. Based on the atmospheric environment and process factors, the impact consequences of the vinyl chloride gas tank leakage accident were more comprehensively evaluated. The material coefficient, general and special hazard coefficients were determined through the relevant physical and chemical properties of vinyl chloride and relevant enterprise information, and the total process unit hazard coefficient and hazard coefficient were calculated. The safety measure compensation coefficient was obtained based on the process control compensation coefficient table, material isolation safety compensation coefficient table, and fire protection facility safety compensation coefficient table. Finally, the actual maximum possible property loss in the three leakage areas was obtained, and the severity of the accident leakage was evaluated accordingly.

[0053] Example 2:

[0054] Considering the actual situation of a vinyl chloride production site at a chemical plant and the local atmospheric conditions, assuming a leakage accident occurs at 11 p.m., Table 1 shows some key parameters used in the ALOHA software simulation, including information such as the leaked substance, geographic location, and atmospheric environment.

[0055] Table 1 Environmental parameters for leakage and diffusion of vinyl chloride gas tanks

[0056]

[0057] S2. Use ALOHA software to simulate a vinyl chloride gas tank leak and determine the hazard range of vinyl chloride toxic gas diffusion.

[0058] The acute exposure guideline concentrations (AEGLs) are used to divide the impact range of toxic gases produced during the leakage of vinyl chloride gas tanks. According to the severity of the impact of toxic gases on humans, they are divided into three levels as shown in Table 2.

[0059]

[0060] S3. Determine the diffusion range of vinyl chloride leakage, the combustion range of vapor cloud, and the explosion range of vapor cloud.

[0061] Select a vinyl chloride production site of a chemical plant and combine it with the local atmospheric conditions to determine the wind speed is 2.6m / s, the outdoor temperature is -20℃, and the relative humidity is 65%. Figure 1 The scope of toxic spread of vinyl chloride leakage, Figure 2 Vapor cloud combustion range and Figure 3 Explosion range of vapor cloud.

[0062] Table 3 shows the parameters of the diffusion conditions simulated by the ALOHA software, including information such as the leaked material, geographical location, atmospheric environment, and equipment specifications.

[0063]

[0064] S4. Fitting the ALOHA results into QGIS.

[0065] The three results obtained by ALOHA simulation are fitted in the field, such as Figure 4 As shown, Figure 4 They are, in order, the field fitting diagram of the diffusion of vinyl chloride gas tank leakage, the field fitting diagram of the combustion of vinyl chloride leakage vapor cloud, and the field fitting diagram of the explosion of vinyl chloride leakage vapor cloud.

[0066] S5. Use the comprehensive index evaluation method to calculate the actual maximum possible property loss to assess the severity of the accident, and integrate all collected data and analysis results to compile a summary table of vinyl chloride gas tank hazard analysis.

[0067] According to the field fitting diagram of vapor cloud combustion and vapor cloud explosion of vinyl chloride leakage, the equipment and facilities involved in vapor cloud combustion and vapor cloud explosion after leakage are determined.

[0068] Calculating the Actual Maximum Possible Property Loss Using the Comprehensive Index Method

[0069] Consult the Material Coefficient Determination Guide to determine the material coefficient of vinyl chloride.

[0070] Vinyl chloride material coefficient MF = 24

[0071] The fire and explosion hazard index table is used to determine the general and special hazard factors of the process unit, and then the total process unit hazard factor is calculated. The safety measure compensation factor is calculated using the process control compensation factor table, material isolation safety compensation factor table, and fire protection facility safety compensation factor table.

[0072] (When flammable liquids are handled above the reboiling point in a closed area and the amount of flammable liquid is greater than 4540 kg, take 0.9)

[0073] General process risk factor: F1 = 0.9

[0074] The basic coefficient is 1, the toxic substance NH = 3, the absolute value of the negative pressure operation is less than 500mmHg (66kPa), and the gas cabinet is 3kPa, so 0.5 is taken. The number of flammable and unstable substances: the hazard factor is calculated by the formula using the total energy value of the process unit (joules, storage material amount × combustion heat), and the flash point is <37.8℃

[0075] log Y=-0.403115+0.378703(log X)-0.046402(log X) 2 -0.015379(log X) 3

[0076] The calculated coefficient is 0.16, the connector leakage coefficient is 1.5, and the open flame equipment usage coefficient is about 1.

[0077]

[0078] F2 = basic coefficient + sum of all selected special process hazard coefficients

[0079] Special process risk factor: F2=4.16

[0080] Process unit risk factor F3 = F1 × F2 = 4.16 × 0.9 = 3.744

[0081] Process control compensation coefficient C1 = 0.7621, material isolation compensation coefficient C2 = 0.9604

[0082] Fire prevention measures compensation coefficient C3 = 0.8324

[0083] Safety compensation coefficient = 0.6092, hazard coefficient = 0.7

[0084] Based on the simulation results, the extent of damage in the three impact areas of vinyl chloride leakage, combustion, and explosion was determined, and the possible property losses and the actual maximum possible property losses in the three areas were calculated in turn using the following formula. The possible property losses caused to equipment and facilities in each area were clarified and the severity was assessed.

[0085] Basic maximum possible property loss = property value in the leakage area × hazard coefficient

[0086] Actual maximum possible property loss = basic maximum possible property loss × safety measures compensation coefficient

[0087] Integrate all collected data and analysis results to prepare a summary table of hazard analysis for vinyl chloride gas cabinets.

[0088] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for simulating and visualizing vinyl chloride gas tank leaks based on ALOHA and QGIS. This method utilizes the high-precision simulation capabilities of ALOHA software to perform a detailed simulation of gas diffusion following a vinyl chloride gas tank leak. Combined with the powerful visualization capabilities of the QGIS geographic information system, the simulation results are presented in an intuitive and clear manner, accurately reflecting the diffusion range and impact of vinyl chloride gas after a leak, providing data support for subsequent risk assessment and safety management.

2. A risk management method for vinyl chloride gas tanks that integrates simulation analysis, economic evaluation, and safety decision-making. The method is characterized by: based on the simulation of vinyl chloride leakage and diffusion, it further introduces economic loss evaluation indicators and fire and explosion hazard indexes, combines multi-dimensional data on process conditions, leakage scale, and environmental factors, and uses specific algorithms and evaluation models to comprehensively evaluate the safety performance of gas tanks and the risk level of potential accident consequences. At the same time, corresponding safety strategies and risk control measures are formulated based on the evaluation results to provide scientific and effective decision-making support for the management of chemical companies.

3. A method for integrating vinyl chloride gas tank leak simulation analysis and property assessment for chemical risk management, comprising the following steps: S1. Comprehensively collect environmental parameters of vinyl chloride gas tanks, including tank type, stored material characteristics, and storage volume, to lay the foundation for simulation analysis and risk assessment; S2. Use ALOHA software to perform high-precision simulations of vinyl chloride gas tank leaks, predicting the spread and severity of toxic gases and providing a basis for emergency response. S3. Using the QGIS geographic information system, spatially process and visualize the ALOHA simulation results to enhance data visibility and facilitate rapid understanding of the impact and severity of the leak. S4. Accurately integrate ALOHA's simulation data into the QGIS system to ensure close integration of simulation data with the actual environment, providing reliable support for risk assessment; S5. Use the comprehensive index evaluation method, combine simulation data and collected information, evaluate the severity of the accident, and compile a summary table of hazard analysis of vinyl chloride gas tanks to provide comprehensive support for risk management.

4. The method for integrating vinyl chloride gas cabinet leakage simulation analysis and property assessment for chemical risk management according to claim 1, characterized in that: In step S1, special attention was paid to incorporating the actual conditions of the vinyl chloride chemical plant and the local atmospheric conditions. These detailed information were used to accurately determine the key parameters required for the ALOHA software simulation, such as the specific characteristics of the leaked material, the geographical location, and the atmospheric environment. This approach ensured that the simulation results could truly reflect the diffusion conditions after the vinyl chloride gas tank leak.

5. The method for integrating vinyl chloride gas cabinet leakage simulation analysis and property assessment for chemical risk management according to claim 1, characterized in that: In step S2, the acute exposure guidance concentration is used to divide the impact range of toxic gases generated during the leakage of vinyl chloride gas cabinets; according to the severity of the impact of toxic gases on the human body, they are divided into three levels, so as to more accurately assess the degree of harm of the leakage accident.

6. The method for integrating vinyl chloride gas cabinet leakage simulation analysis and property assessment for chemical risk management according to claim 1, characterized in that: In step S3, the gas diffusion models provided by ALOHA include a Gaussian model for neutral or buoyant gases and a heavy gas diffusion model. When a vinyl chloride storage tank leaks at a specific pressure and temperature, it exhibits gas-liquid two-phase flow characteristics. Flash evaporation occurs near the leak port. The rapid evaporation of liquefied vinyl chloride causes the temperature of the surrounding air to drop, forming a mixture with the air. The density of the mixed gas is greater than that of air, and the diffusion of vinyl chloride leakage is affected by gravity, manifesting as heavy gas diffusion. Therefore, the heavy gas model is selected for analysis, and its mathematical expression is: Where: c is the mass concentration of the leaked substance, c0 is the mass concentration of the leaked substance at the center position m, b is the horizontal range width m; S y is the atmospheric level concentration ratio, S z is the atmospheric vertical concentration ratio, α is the wind speed profile constant, Z0 is the wind speed profile height in m, u0 is the actual wind speed at Z0 height in m / s, u x is the actual wind speed in the positive direction of the x-axis in m / s.

7. The method for integrating vinyl chloride gas cabinet leakage simulation analysis and property assessment for chemical risk management according to claim 1, characterized in that: The S4 step is specifically as follows: 1) Data preprocessing: Use QGIS to perform projection conversion and clipping on the layer of the vinyl chloride gas tank area to ensure consistency in data format and coordinate system; 2) Threat Area Overlay: Overlay the threat area data layer under the most favorable threat conditions obtained by ALOHA simulation onto the map, and visually display areas of different threat levels through color grading and marking; 3) Interactive Analysis: Leveraging QGIS’s geographic information system capabilities, it allows users to perform interactive operations such as zooming, rotating, and selecting specific areas for detailed analysis, allowing for a deeper understanding of the details of the threat area. Through this step, the leakage simulation results can be more accurately combined with the actual geographical environment, providing more reliable support for subsequent risk assessment and decision-making.

8. The method for integrating vinyl chloride gas cabinet leakage simulation analysis and property assessment for chemical risk management according to claim 1, characterized in that: In step S5, the comprehensive evaluation must be strictly carried out through the following steps: 1) Determination of Material Coefficient: According to the Material Coefficient Determination Guidelines, the physical and chemical properties of vinyl chloride and environmental conditions are comprehensively considered to determine its material coefficient; this coefficient will be used in the subsequent hazard factor calculation; 2) Hazard factor calculation: Using the fire and explosion hazard index table, combined with the characteristics of the process unit and the amount of hazardous substances stored, calculate the general and special hazard factors of the process unit; Combined with the material coefficient and other compensation coefficients, the total risk factor of the process unit is calculated comprehensively; 3) Hazard Factor Analysis: By analyzing the ALOHA simulation results and combining them with the process unit hazard factors, we can further determine the impact radius and potential hazard level of the leaked material. This analysis will provide a basis for subsequent property value assessment. 4) Property Value Assessment: Based on the impact radius and degree of damage of the leaked material, combined with known property distribution and value information, the value of potentially affected properties within the leaked area is assessed; 5) Calculation of Maximum Possible Property Loss: Use the property value and hazard coefficient within the leakage area to calculate the basic maximum possible property loss. Combined with the safety measures compensation coefficient, the actual maximum possible property loss is calculated. The calculated actual maximum possible property loss is used to assess the severity of the accident. All collected data and analysis results are then integrated to compile a summary table of vinyl chloride gas tank hazard analysis. The specific formula is as follows: Basic maximum possible property loss = property value in the leakage area × hazard coefficient; Actual maximum possible property loss = basic maximum possible property loss × safety measures compensation coefficient.

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