Safety risk assessment method and device for liquefied natural gas loading and unloading system

Abstract

The present invention provides a method and device for safety risk assessment of a liquefied natural gas loading and unloading system, the method comprising: constructing a safety risk assessment index system for a liquefied natural gas loading and unloading system, the safety risk assessment index system for a liquefied natural gas loading and unloading system comprising a target layer, a criterion layer and a scheme layer, the target layer being the safety risk value of the liquefied natural gas loading and unloading system, the criterion layer comprising a plurality of risk assessment indicators, and the scheme layer comprising a plurality of safety risk elements; obtaining scoring data of the plurality of risk assessment indicators and the plurality of safety risk elements, and determining the weight coefficients of the criterion layer and the scheme layer to the target layer according to the scoring data; establishing a safety risk assessment model for a liquefied natural gas loading and unloading system according to the weight coefficient, and conducting safety risk assessment on the liquefied natural gas loading and unloading system to be assessed, and obtaining a safety risk assessment value. The present invention improves the efficiency and accuracy of safety risk assessment of liquefied natural gas.

Description

Technical Field

[0001] The present invention relates to the technical field of safety assessment of liquefied natural gas loading and unloading systems, and in particular to a safety risk assessment method and device for a liquefied natural gas loading and unloading system. Background Art

[0002] As the production development level of various industries in my country is getting faster and faster, the level of production safety management also needs to be further improved. In the liquefied natural gas (LNG) industry, which is prone to accidents, it is particularly necessary to control it, especially for LNG loading and unloading systems, where risks run through the entire system domain.

[0003] In the prior art, the safety risk assessment of the LNG loading and unloading system relies on manpower, but the efficiency of the safety risk assessment of the LNG loading and unloading system by manpower is low, and the assessment accuracy is also low.

[0004] Therefore, it is urgent to propose a liquefied natural gas loading and unloading system safety risk assessment method and device to assess the safety risks of the LNG loading and unloading system in order to improve the assessment efficiency and accuracy. Summary of the invention

[0005] In view of this, it is necessary to provide a method and device for safety risk assessment of a liquefied natural gas loading and unloading system to solve the technical problem in the prior art that the safety risk assessment of the liquefied natural gas loading and unloading system is low in efficiency and accuracy due to reliance on manpower to assess the safety risk.

[0006] In one aspect, the present invention provides a method for safety risk assessment of a liquefied natural gas loading and unloading system, comprising:

[0007] Constructing a safety risk assessment index system for a liquefied natural gas loading and unloading system, the safety risk assessment index system for a liquefied natural gas loading and unloading system comprises a target layer, a criterion layer and a scheme layer, the target layer is the safety risk value of the liquefied natural gas loading and unloading system, the criterion layer comprises a plurality of risk assessment indicators, and the scheme layer comprises a plurality of safety risk factors;

[0008] Obtaining scoring data of the plurality of risk assessment indicators and the plurality of security risk factors, and determining weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data;

[0009] A safety risk assessment model for a liquefied natural gas loading and unloading system is established according to the weight coefficients, and a safety risk assessment is performed on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system to be evaluated to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated.

[0010] In some possible implementations, the multiple risk assessment indicators include inherent risk assessment indicators, dynamic risk assessment indicators and disturbance risk assessment indicators. The inherent risk assessment indicators include major hazard source determination indicators and major hazard source classification indicators. The dynamic risk assessment indicators include high-risk equipment indicators, high-risk process indicators, high-risk material indicators, high-risk site indicators and high-risk operation indicators. The disturbance risk assessment indicators include earthquake indicators, lightning and static electricity indicators, flood indicators, typhoon indicators, tornado indicators and mountain torrents and mudslide indicators.

[0011] In some possible implementations, determining the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data includes:

[0012] Constructing a judgment matrix among the target layer, the criterion layer and the solution layer according to the scoring data;

[0013] Performing a consistency check on the judgment matrix to obtain a consistency check index, and judging whether the consistency of the judgment matrix meets the requirement based on the consistency check index;

[0014] When the consistency of the judgment matrix meets the requirement, determining the first initial weight of each risk assessment indicator to the target layer and the second initial weight of each security risk factor to each risk assessment indicator based on the judgment matrix;

[0015] A weight coefficient is determined according to the first initial weight and the second initial weight.

[0016] In some possible implementations, the judgment matrix is:

[0017]

[0018] Where i and j are the i-th and j-th risk assessment indicators or the i-th and j-th safety risk factors, respectively; C ij It represents the importance of the i-th and j-th risk assessment indicators or the i-th and j-th security risk elements relative to the target layer.

[0019] In some possible implementations, the performing consistency check on the judgment matrix includes:

[0020] Obtaining the number of features of the judgment matrix, and determining the maximum feature root of the judgment matrix according to the number of features;

[0021] Determining a consistency index based on the maximum characteristic root and the number of characteristics;

[0022] Determining whether the order of the judgment matrix is ​​greater than a threshold order, and when the order of the judgment matrix is ​​greater than the threshold order, determining an average random consistency index of the same order of the judgment matrix based on the order of the judgment matrix;

[0023] Determining a random consistency ratio according to the consistency index and the average random consistency index of the same order;

[0024] When the random consistency ratio is less than the ratio threshold, the consistency of the judgment matrix meets the requirement.

[0025] In some possible implementations, determining the maximum eigenvalue root of the judgment matrix according to the number of features includes:

[0026] According to the product of the elements of each row of the judgment matrix, the nth root of the product is determined;

[0027] Determine a weight vector of each security risk factor in the judgment matrix according to the nth root;

[0028] Normalizing the weight vector to obtain a normalized weight vector;

[0029] The maximum eigenvalue root is determined according to the normalized weight vector and the number of features.

[0030] In some possible implementations, the consistency indicator is:

[0031]

[0032] The random consistency ratio is:

[0033]

[0034] In the formula, CI is the consistency index; λ max is the maximum characteristic root; n is the number of characteristics; CR is the random consistency ratio; RI is the average random consistency index of the same order.

[0035] In some possible implementations, performing a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the liquefied natural gas loading and unloading system safety risk assessment model to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated includes:

[0036] Obtaining multiple actual safety risk factors of the liquefied natural gas loading and unloading system to be evaluated;

[0037] Based on the liquefied natural gas loading and unloading system safety risk assessment model and the multiple actual safety risk factors, a major hazard source determination index value, a major hazard source classification index value, a high-risk equipment index value, a high-risk process index value, a high-risk material index value, a high-risk site index value, a high-risk operation index value, an earthquake index value, a lightning strike and static electricity index value, a flood index value, a tornado index value, and a mountain torrent and mudslide index value are obtained;

[0038] Determine the inherent risk assessment index value based on the major hazard source determination index value and the major hazard source classification index value;

[0039] Determine the dynamic risk assessment index value based on the high-risk equipment index value, high-risk process index value, high-risk material index value, high-risk site index value and high-risk operation index value;

[0040] Determine disturbance risk assessment index values ​​based on earthquake index values, lightning strike and static electricity index values, flood index values, typhoon index values, tornado index values, and mountain torrent and mud-rock flow index values;

[0041] The safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated is determined according to the inherent risk assessment index value, the dynamic risk assessment index value and the disturbance risk assessment index value.

[0042] In some possible implementations, the liquefied natural gas loading and unloading system safety risk assessment method further includes:

[0043] The safety level of the liquefied natural gas loading and unloading system to be evaluated is determined according to the safety risk assessment value, and the safety risk assessment value and the safety level are transmitted to a display interface for display.

[0044] On the other hand, the present invention also provides a liquefied natural gas loading and unloading system safety risk assessment device, comprising:

[0045] A safety risk assessment system construction module is used to construct a safety risk assessment index system for a liquefied natural gas loading and unloading system. The safety risk assessment index system for a liquefied natural gas loading and unloading system includes a target layer, a criterion layer, and a solution layer. The target layer is the safety risk value of the liquefied natural gas loading and unloading system. The criterion layer includes multiple risk assessment indicators, and the solution layer includes multiple safety risk factors.

[0046] A weight coefficient determination module, used to obtain the scoring data of the multiple risk assessment indicators and the multiple security risk factors, and determine the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data;

[0047] A safety risk assessment module is used to establish a safety risk assessment model for a liquefied natural gas loading and unloading system according to the weight coefficient, and to perform a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system, so as to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated.

[0048] The beneficial effect of adopting the above-mentioned embodiment is that the safety risk assessment method for the liquefied natural gas loading and unloading system provided by the present invention obtains scoring data of multiple risk assessment indicators and multiple safety risk factors, and determines the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data. In the subsequent safety assessment process, it is only necessary to conduct a safety assessment on the liquefied natural gas loading and unloading system to be evaluated according to the weight coefficient, which is free from dependence on manpower and improves the efficiency and accuracy of the safety risk assessment of the liquefied natural gas loading and unloading system. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0050] Figure 1 A schematic flow chart of an embodiment of a method for safety risk assessment of a liquefied natural gas loading and unloading system provided by the present invention;

[0051] Figure 2 A schematic diagram of the structure of an embodiment of the inherent risk assessment indicator provided by the present invention;

[0052] Figure 3 A schematic diagram of the structure of an embodiment of the dynamic risk assessment indicator provided by the present invention;

[0053] Figure 4 A schematic diagram of the structure of an embodiment of the disturbance risk assessment index provided by the present invention;

[0054] Figure 5 For the present invention Figure 1 A schematic flow chart of an embodiment of S102;

[0055] Figure 6 For the present invention Figure 5 A schematic flow chart of an embodiment of S502;

[0056] Figure 7 For the present invention Figure 6 Another embodiment of S601 is a flowchart of another embodiment;

[0057] Figure 8 For the present invention Figure 1 A schematic flow chart of an embodiment of S103;

[0058] Fig. 9 A schematic diagram of the structure of an embodiment of the interactive interface provided by the present invention;

[0059] Fig.10 A schematic diagram of an embodiment of the structure of the safety risk assessment value of the disturbance risk assessment indicator provided by the present invention;

[0060] Fig.11 A schematic structural diagram of an embodiment of a safety risk assessment device for a liquefied natural gas loading and unloading system provided by the present invention. DETAILED DESCRIPTION

[0061] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. 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 those skilled in the art without creative work are within the scope of protection of the present invention.

[0062] It should be understood that the schematic drawings are not drawn to scale. The flow chart used in the present invention shows the operations implemented according to some embodiments of the present invention. It should be understood that the operations of the flow chart can be implemented out of order, and the steps without logical context can be reversed or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flow chart under the guidance of the content of the present invention, and can also remove one or more operations from the flow chart.

[0063] Some of the block diagrams shown in the accompanying drawings are functional entities that do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor systems and / or microcontroller systems.

[0064] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0065] The embodiments of the present invention provide a method and device for safety risk assessment of a liquefied natural gas loading and unloading system, which are described below respectively.

[0066] Figure 1 A schematic flow chart of an embodiment of a method for safety risk assessment of a liquefied natural gas loading and unloading system provided by the present invention is shown in FIG. Figure 1 As shown in the figure, the safety risk assessment method for liquefied natural gas loading and unloading system includes:

[0067] S101. Construct a safety risk assessment index system for liquefied natural gas loading and unloading systems. The safety risk assessment index system for liquefied natural gas loading and unloading systems includes a target layer, a criterion layer, and a solution layer. The target layer is the safety risk value of the liquefied natural gas loading and unloading system, the criterion layer includes multiple risk assessment indicators, and the solution layer includes multiple safety risk factors;

[0068] S102, obtaining scoring data of multiple risk assessment indicators and multiple security risk factors, and determining weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data;

[0069] S103. Establish a safety risk assessment model for a liquefied natural gas loading and unloading system according to the weight coefficient, and conduct a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system to be evaluated, so as to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated.

[0070] Compared with the prior art, the method for safety risk assessment of a liquefied natural gas loading and unloading system provided in an embodiment of the present invention obtains scoring data of multiple risk assessment indicators and multiple safety risk factors, and determines the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data. In the subsequent safety assessment process, only the weight coefficients need to be used to conduct a safety assessment of the liquefied natural gas loading and unloading system to be assessed, thereby breaking away from dependence on manpower and improving the efficiency and accuracy of safety risk assessment of the liquefied natural gas loading and unloading system.

[0071] It should be understood that the scoring data in step S102 can be obtained based on a score given to a plurality of risk assessment indicators and a plurality of security risk factors by an expert group consisting of no less than two experts.

[0072] And the scoring weight of each expert in the expert group composed of no less than two experts should be set, and the sum of the scoring weights of all experts is 1. Specifically: the scoring weight can be set according to factors such as the authority and age of the experts, which will not be elaborated here.

[0073] In some embodiments of the present invention, Figure 2-Figure 4As shown, multiple risk assessment indicators include inherent risk assessment indicators, dynamic risk assessment indicators and disturbance risk assessment indicators. The inherent risk assessment indicators include major hazard source determination indicators and major hazard source classification indicators. The dynamic risk assessment indicators include high-risk equipment indicators, high-risk process indicators, high-risk material indicators, high-risk site indicators and high-risk operation indicators. The disturbance risk assessment indicators include earthquake indicators, lightning and static electricity indicators, flood indicators, typhoon indicators, tornado indicators and mountain torrents and mudslide indicators.

[0074] Since the liquefied natural gas loading and unloading system can be divided into onshore liquefied natural gas loading and unloading system and offshore liquefied natural gas loading and unloading system according to the application scenario, the safety risk factors in these two application scenarios are not exactly the same.

[0075] It should be noted that the disturbance risk assessment indicators in the onshore LNG loading and unloading system safety risk assessment indicator system include earthquake indicators, lightning and static electricity indicators, flood indicators, tornado indicators, and mountain torrents and mudslide indicators. The disturbance risk assessment indicators in the offshore LNG loading and unloading system safety risk assessment indicator system include earthquake indicators, lightning and static electricity indicators, and typhoon indicators.

[0076] In a specific embodiment of the present invention, Figure 2 As shown in the figure, the major hazard source determination indicators in the safety risk assessment index system of onshore liquefied natural gas loading and unloading systems include the actual amount of methane in the loading and unloading area, the tank diameter of the tank truck, the maximum allowable loading quantity, the average loading and unloading time, the type of tank truck, the unloading method and the type of accidents in the LNG loading and unloading area.

[0077] The major hazard source classification indicators in the safety risk assessment index system of onshore liquefied natural gas loading and unloading systems include the number of people who may be exposed off-site, the number of people who may be exposed in the LNG loading and unloading area, the correction factor for exposed people outside the loading and unloading area, the correction factor for hazardous chemicals in the loading and unloading area, the safety standardization level, and the environmental functional area in which they are located.

[0078] The major hazard source determination indicators in the safety risk assessment index system of offshore liquefied natural gas loading and unloading systems include the number of return fans, the actual amount of methane in the loading and unloading area, the number of LNG terminals, the number of LNG berths, the capacity of LNG ships, the number of unloading arms, the number of meteorological returns, and the types of accidents in the LNG loading and unloading area.

[0079] The major hazard source classification indicators in the safety risk assessment index system of offshore liquefied natural gas loading and unloading systems include the number of people who may be exposed off-site, the number of people who may be exposed in the LNG loading and unloading area, the correction factor for exposed people outside the loading and unloading area, the correction factor for hazardous chemicals in the loading and unloading area, the safety standardization level, and the environmental functional area in which they are located.

[0080] In a specific embodiment of the present invention, Figure 3As shown in the figure, the high-risk equipment indicators in the safety risk assessment index system of onshore liquefied natural gas loading and unloading systems include LNG loading / unloading skids, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam (Boil Off Gas, BOG) exhaust pipelines, BOG pressure release pipelines, gas pipelines and safety devices. Among them, the LNG loading / unloading skids include loading and unloading arms, cryogenic pump safety performance, flow meter performance, vaporizer performance and automatic control instrument performance. Flanges and valves include valves and flanges. The loading and unloading vehicle includes vaporizers, mechanical protection devices and safety accessories. The safety accessories include explosion-proof pressure relief devices, emergency shut-off devices, liquid level measuring devices, and pressure and temperature measuring devices. The LNG loading and unloading vehicle pipeline includes loading lines and unloading lines. The loading line includes the air tightness of the diagonal bolt fastening points, the reliability of the loading pipeline precooling controller, the performance of the loading pigging system and the classic grounding stability. The unloading line includes the pressure resistance of the unloading valve, the connection stability of the unloading pipe mouth, the corrosion resistance of the unloading hose interface and the low temperature resistance of the unloading hose. Safety devices include interlocking protection devices, emergency shut-off devices, fire protection systems, and lightning and anti-static devices.

[0081] The high-risk process indicators in the safety risk assessment index system of onshore LNG loading and unloading systems include unloading process, liquid loading process, gas gathering and transmission system, instrument detection system, and flame and gas leakage monitoring and alarm system. Among them, the unloading process includes nitrogen purging and tank truck pressurization, and the loading process includes nitrogen purging and pipeline precooling.

[0082] The high-risk material indicators in the onshore LNG loading and unloading system safety risk assessment index system include methane, oxygen content, nitrogen, material hazard, acetylene and propyne. The high-risk operation indicators in the onshore LNG loading and unloading system safety risk assessment index system and the offshore LNG loading and unloading system safety risk assessment index system are the same, including loading and unloading operations, blind plate extraction and plugging operations, hoisting operations, first space operations and pipeline transportation operations.

[0083] The high-risk location indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: loading / unloading platforms, accident emergency pools, and the distance between loading and unloading equipment.

[0084] The high-risk operation indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: loading and unloading operations, blind plate extraction and plugging operations, lifting operations, confined space operations and pipeline transportation operations.

[0085] The high-risk equipment indicators in the safety risk assessment index system of offshore liquefied natural gas loading and unloading systems include LNG loading and unloading systems, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam (Boil Off Gas, BOG) exhaust pipelines, BOG pressure release pipelines, gas pipelines and safety devices. Among them, the LNG loading and unloading system includes loading and unloading arms and meteorological arms, cryogenic pump safety performance, flow meter performance, vaporizer performance and automatic control instrument performance. Flanges and valves include valves and flanges. The loading and unloading vehicle includes vaporizers, mechanical protection devices and safety accessories. The safety accessories include explosion-proof pressure relief devices, emergency shut-off devices, liquid level measuring devices, pressure and temperature measuring devices. The LNG loading and unloading vehicle pipeline includes loading lines and unloading lines. The loading line includes the air tightness of the diagonal bolt fastening points, the reliability of the loading pipeline precooling controller, the performance of the loading pigging system and the classic grounding stability. The unloading line includes the pressure resistance of the unloading valve, the stability of the unloading pipe mouth connection, the corrosion resistance of the unloading hose interface and the low temperature resistance of the unloading hose. Safety devices include interlocking protection devices, emergency shut-off devices, fire protection systems, and lightning and anti-static devices.

[0086] The high-risk process indicators in the safety risk assessment index system of offshore LNG loading and unloading systems include unloading process, liquid loading process, gas gathering and transmission system, instrument detection system, and flame and gas leakage monitoring and alarm system. Among them, the unloading process includes nitrogen purging and LNG ship pressurization, and the loading process includes nitrogen purging and pipeline precooling.

[0087] The high-risk material indicators in the safety risk assessment index system for offshore LNG loading and unloading systems include methane, oxygen content, nitrogen, material hazard, acetylene and propyne. The high-risk operation indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems are the same, including loading and unloading operations, blind plate extraction and plugging operations, lifting operations, first space operations and pipeline transportation operations. The earthquake indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems are the same, including site, earthquake resistance level, earthquake fortification level and earthquake fortification intensity.

[0088] The high-risk location indicators in the safety risk assessment index system of offshore liquefied natural gas loading and unloading systems include: docks, accident emergency pools, and the distance between loading and unloading equipment.

[0089] The high-risk operation indicators of the offshore liquefied natural gas loading and unloading system safety risk assessment index system include: loading and unloading operations, blind plate extraction and plugging operations, lifting operations, confined space operations and pipeline transportation operations.

[0090] In a specific embodiment of the present invention, Figure 4As shown in the figure, the seismic indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: site, seismic resistance level, seismic intensity, seismic fortification level and seismic fortification intensity.

[0091] The lightning strike and static electricity indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: lightning protection, lightning protection building classification and lightning protection devices. The lightning protection devices include internal lightning protection devices and external lightning protection devices.

[0092] The flood indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: flood control standards, flood season forecasts, flood control scheduling, flood control projects and emergency response capabilities.

[0093] The tornado indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: wind speed, level, stability of wind-resistant structural components, and wind-resistant design.

[0094] The flash flood and mudslide indicators of the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems include: safety level of prevention and control projects, stability of prevention and control project buildings, monitoring level and emergency response capabilities.

[0095] The seismic indicators of the safety risk assessment index system for offshore liquefied natural gas loading and unloading systems include: site, seismic resistance level, seismic intensity, seismic fortification level and seismic fortification intensity.

[0096] The lightning strike and static electricity indicators of the offshore liquefied natural gas loading and unloading system safety risk assessment index system include: lightning protection, lightning protection building diversity and lightning protection devices. The lightning protection devices include internal lightning protection devices and external lightning protection devices.

[0097] The typhoon indicators of the offshore liquefied natural gas loading and unloading system safety risk assessment index system include: typhoon level, stability of wind-resistant structural components, wind-resistant design, tsunami protection projects and emergency response capabilities.

[0098] In some embodiments of the present invention, Figure 5 As shown, the step S102 of determining the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data includes:

[0099] S501, constructing a judgment matrix among the target layer, the criterion layer and the solution layer according to the scoring data;

[0100] S502, performing consistency check on the judgment matrix to obtain a consistency check index, and judging whether the consistency of the judgment matrix meets the requirements based on the consistency check index;

[0101] S503: When the consistency of the judgment matrix meets the requirement, determine the first initial weight of each risk assessment indicator to the target layer and the second initial weight of each security risk factor to each risk assessment indicator based on the judgment matrix;

[0102] S504: Determine a weight coefficient according to the first initial weight and the second initial weight.

[0103] It should be understood that when it is determined in step S502 that the consistency of the judgment matrix does not meet the requirement, the process should return to step S501 to reconstruct the judgment matrix until the consistency of the judgment matrix meets the requirement.

[0104] In a specific embodiment of the present invention, the judgment matrix is:

[0105]

[0106] Where i and j are the i-th and j-th risk assessment indicators or the i-th and j-th safety risk factors, respectively; C ij It represents the importance of the i-th and j-th risk assessment indicators or the i-th and j-th security risk factors relative to the target layer.

[0107] Furthermore, the scoring scale of the judgment matrix in step S501 is shown in Table 1:

[0108] Table 1 Scoring scale of the judgment matrix

[0109]

[0110]

[0111] In some embodiments of the present invention, Figure 6 As shown, step S502 includes:

[0112] S601, obtaining the number of features of the judgment matrix, and determining the maximum feature root of the judgment matrix according to the number of features;

[0113] S602, determining a consistency index based on the maximum characteristic root and the number of characteristics;

[0114] S603, judging whether the order of the judgment matrix is ​​greater than a threshold order, and when the order of the judgment matrix is ​​greater than the threshold order, determining the same-order average random consistency index of the judgment matrix based on the order of the judgment matrix;

[0115] S604, determining a random consistency ratio according to the consistency index and the average random consistency index of the same order;

[0116] S605: When the random consistency ratio is less than the ratio threshold, it is judged that the consistency of the matrix meets the requirement.

[0117] Among them, the consistency index is:

[0118]

[0119] The random consistency ratio is:

[0120]

[0121] In the formula, CI is the consistency index; λ max is the maximum characteristic root; n is the number of characteristics; CR is the random consistency ratio; RI is the average random consistency index of the same order.

[0122] Among them, the values ​​of each order RI are shown in Table 2:

[0123] Table 2 RI values ​​at various levels

[0124]

[0125] It should be noted that the threshold ratio in step S605 is 0.10.

[0126] In some embodiments of the present invention, Figure 7 As shown, step S601 includes:

[0127] S701, judging the product of each row of the matrix and determining the nth root of the product;

[0128] S702, determining the weight vector of each security risk factor in the judgment matrix according to the nth root;

[0129] S703, normalizing the weight vector to obtain a normalized weight vector;

[0130] S704: Determine the maximum eigenvalue root according to the normalized weight vector and the number of features.

[0131] Among them, the product M i for:

[0132]

[0133] nth root for:

[0134]

[0135] Among them, the weight vector Normalized weight vector W i for:

[0136]

[0137] In the formula, a ij is the element in the i-th row and j-th column of the judgment matrix.

[0138] Furthermore, the maximum characteristic root is:

[0139]

[0140] In the formula, (B k W) i is the vector B k The i-th element in W.

[0141] In some embodiments of the present invention, Figure 8 As shown, step S103 includes:

[0142] S801. Obtain multiple actual safety risk factors of the liquefied natural gas loading and unloading system to be evaluated;

[0143] S802. Based on the liquefied natural gas loading and unloading system safety risk assessment model and multiple actual safety risk factors, obtain the major hazard source determination index value, the major hazard source classification index value, the high-risk equipment index value, the high-risk process index value, the high-risk material index value, the high-risk site index value, the high-risk operation index value, the earthquake index value, the lightning and static electricity index value, the flood index value, the typhoon index value, the tornado index value, and the mountain torrent and mud-rock flow index value;

[0144] S803. Determine the inherent risk assessment index value based on the major hazard source determination index value and the major hazard source classification index value;

[0145] S804. Determine a dynamic risk assessment index value based on a high-risk equipment index value, a high-risk process index value, a high-risk substance index value, a high-risk site index value, and a high-risk operation index value;

[0146] S805, determining a disturbance risk assessment index value according to an earthquake index value, a lightning strike and static electricity index value, a flood index value, a tornado index value, and a mountain torrent and mud-rock flow index value;

[0147] S806. Determine the safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated based on the inherent risk assessment index value, the dynamic risk assessment index value, and the disturbance risk assessment index value.

[0148] In order to facilitate the staff to obtain the above-mentioned indicator values ​​and safety risk assessment values ​​more intuitively, in some embodiments of the present invention, the inherent risk assessment indicator value, dynamic risk assessment indicator value, disturbance risk assessment indicator value and safety risk assessment value can be displayed on the display interface.

[0149] It should be understood that: a software can also be designed according to the above principles, the software includes an interactive interface, and step S801 is specifically: multiple actual safety risk factors of the liquefied natural gas loading and unloading system to be evaluated are input into the specified position of the interactive interface, and the inherent risk assessment index value, dynamic risk assessment index value, disturbance risk assessment index value and safety risk assessment value are displayed on the interactive interface.

[0150] Among them, the method of inputting multiple actual safety risk factors of the liquefied natural gas loading and unloading system to be evaluated into the designated position of the interactive interface includes but is not limited to click selection input, drop-down selection input and manual editing input.

[0151] In some embodiments of the present invention, the safety risk assessment value in step S806 ranges from 1 to 4. The higher the safety risk assessment value, the higher the risk of the liquefied natural gas loading and unloading system, and the lower the safety risk assessment value, the lower the risk of the liquefied natural gas loading and unloading system.

[0152] In a specific embodiment of the present invention, Fig. 9 As shown in the figure, an interactive interface is provided, and multiple actual safety risk factors related to the major hazard source determination indicators can be Fig. 9 Enter as shown.

[0153] In some embodiments of the present invention, the liquefied natural gas loading and unloading system safety risk assessment method further includes:

[0154] The safety level of the liquefied natural gas loading and unloading system to be evaluated is determined according to the safety risk assessment value, and the safety risk assessment value and the safety level are transmitted to a display interface for display.

[0155] Safety levels can be divided into four levels: safe, relatively safe, unsafe and very dangerous.

[0156] It should be noted that the safety risk assessment values ​​of each indicator layer and the rectification suggestions corresponding to the safety risk assessment values ​​of each indicator layer can also be transmitted to the display interface for display, thereby helping to reduce the probability of accidents in the LNG loading and unloading system.

[0157] In a specific embodiment of the present invention, Fig.10 As shown, it can be seen that the safety risk assessment value of the disturbance risk assessment index of the onshore LNG loading and unloading system is displayed in the display interface (i.e. Fig.10 The final safety factor in the above equation) and the safety level of the disturbance risk assessment index (i.e. Fig.10 In addition to the safety status in the disturbance risk assessment index, it can also be used to display the assessment value of each safety risk factor in the disturbance risk assessment index, and from Fig.10 It can be seen from the data that the tornado and other wind resistance level of the onshore LNG loading and unloading system is if, there are risks, which provides a reference for subsequent rectification.

[0158] In order to better implement the liquefied natural gas loading and unloading system safety risk assessment method in the embodiment of the present invention, based on the liquefied natural gas loading and unloading system safety risk assessment method, the embodiment of the present invention also provides a liquefied natural gas loading and unloading system safety risk assessment device, such as Fig.11As shown, the liquefied natural gas loading and unloading system safety risk assessment device 1100 includes:

[0159] The safety risk assessment system construction module 1101 is used to construct a safety risk assessment index system for a liquefied natural gas loading and unloading system. The safety risk assessment index system for a liquefied natural gas loading and unloading system includes a target layer, a criterion layer, and a solution layer. The target layer is the safety risk value of the liquefied natural gas loading and unloading system, the criterion layer includes multiple risk assessment indicators, and the solution layer includes multiple safety risk factors;

[0160] The weight coefficient determination module 1102 is used to obtain the scoring data of multiple risk assessment indicators and multiple security risk factors, and determine the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data;

[0161] The safety risk assessment module 1103 is used to establish a safety risk assessment model for the liquefied natural gas loading and unloading system according to the weight coefficient, and to perform a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system, so as to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated.

[0162] The liquefied natural gas loading and unloading system safety risk assessment device 1100 provided in the above embodiment can implement the technical solution described in the above embodiment of the liquefied natural gas loading and unloading system safety risk assessment method. The specific implementation principles of the above modules or units can refer to the corresponding contents in the above embodiment of the liquefied natural gas loading and unloading system safety risk assessment method, which will not be repeated here.

[0163] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware (such as a processor, a controller, etc.) through a computer program, and the computer program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0164] The above is a detailed introduction to the liquefied natural gas loading and unloading system safety risk assessment method and device provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A method for safety risk assessment of a liquefied natural gas loading and unloading system, characterized in that: include: Constructing a safety risk assessment index system for a liquefied natural gas loading and unloading system, the safety risk assessment index system for a liquefied natural gas loading and unloading system comprises a target layer, a criterion layer and a scheme layer, the target layer is the safety risk value of the liquefied natural gas loading and unloading system, the criterion layer comprises a plurality of risk assessment indicators, and the scheme layer comprises a plurality of safety risk factors; Obtaining scoring data of the plurality of risk assessment indicators and the plurality of security risk factors, and determining weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data; Establishing a safety risk assessment model for a liquefied natural gas loading and unloading system according to the weight coefficient, and conducting a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system to be evaluated, to obtain a safety risk assessment value for the liquefied natural gas loading and unloading system to be evaluated; The multiple risk assessment indicators include inherent risk assessment indicators, dynamic risk assessment indicators and disturbance risk assessment indicators. The inherent risk assessment indicators include major hazard source determination indicators and major hazard source classification indicators. The dynamic risk assessment indicators include high-risk equipment indicators, high-risk process indicators, high-risk material indicators, high-risk site indicators and high-risk operation indicators. The disturbance risk assessment indicators include earthquake indicators, lightning and static electricity indicators, flood indicators, typhoon indicators, tornado indicators and mountain torrent mudslide indicators. The safety risk assessment index system for liquefied natural gas loading and unloading systems includes the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems and the safety risk assessment index system for offshore liquefied natural gas loading and unloading systems; The major hazard source determination indicators in the safety risk assessment indicator system of onshore LNG loading and unloading systems include the actual amount of methane in the loading and unloading area, the tank diameter of the tank truck, the maximum allowed loading quantity, the average loading and unloading time, the type of tank truck, the unloading method, and the type of accidents in the LNG loading and unloading area; The major hazard source classification indicators in the onshore LNG loading and unloading system safety risk assessment indicator system and the offshore LNG loading and unloading system safety risk assessment indicator system include the number of potentially exposed personnel outside the site, the number of potentially exposed personnel in the LNG loading and unloading area, the correction factor for exposed personnel outside the loading and unloading area, the correction factor for hazardous chemicals in the loading and unloading area, the safety standardization level, and the environmental functional area in which they are located; The major hazard source determination indicators in the safety risk assessment index system of offshore LNG loading and unloading systems include the number of return fans, the actual amount of methane in the loading and unloading area, the number of LNG terminals, the number of LNG berths, the capacity of LNG ships, the number of unloading arms, the number of meteorological returns, and the types of accidents in the LNG loading and unloading area; The high-risk equipment indicators in the safety risk assessment indicator system of onshore liquefied natural gas loading and unloading systems include LNG loading / unloading vehicle skids, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam exhaust pipelines, steam pressure release pipelines, gas pipelines and safety devices; The high-risk equipment indicators in the offshore liquefied natural gas loading and unloading system safety risk assessment indicator system include LNG loading and unloading systems, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam exhaust pipelines, steam pressure release pipelines, gas pipelines and safety devices; The high-risk process indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include unloading process, liquid filling process, gas gathering and transmission system, instrument detection system, and flame and gas leakage monitoring and alarm system; The high-risk substance indicators in the safety risk assessment indicator system for onshore LNG loading and unloading systems and the safety risk assessment indicator system for offshore LNG loading and unloading systems include methane, oxygen content, nitrogen, substance hazard, acetylene and propyne; The high-risk location indicators of the onshore LNG loading and unloading system safety risk assessment index system include: loading / unloading platforms, accident emergency pools, and spacing between loading and unloading equipment; The high-risk location indicators of the offshore LNG loading and unloading system safety risk assessment index system include: docks, accident emergency pools, and the distance between loading and unloading equipment; The high-risk operation indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include loading and unloading operations, blind plate plugging operations, hoisting operations, confined space operations, and pipeline transportation operations; The earthquake indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include site, earthquake resistance level, earthquake fortification level and earthquake fortification intensity; The lightning strike and static electricity indicators of the onshore LNG loading and unloading system safety risk assessment indicator system and the offshore LNG loading and unloading system safety risk assessment indicator system include: lightning protection, lightning protection building classification and lightning protection devices; The flood indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: flood control standards, flood season forecasts, flood control dispatch, flood control projects, and emergency response capabilities; The tornado indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: wind speed, level, stability of wind-resistant structural components, and wind-resistant design; The flash flood and mudslide indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: safety level of prevention and control projects, stability of prevention and control project buildings, monitoring level, and emergency response capabilities; The typhoon indicators of the offshore liquefied natural gas loading and unloading system safety risk assessment index system include: typhoon level, stability of wind-resistant structural components, wind-resistant design, tsunami protection projects and emergency response capabilities.

2. The liquefied natural gas loading and unloading system safety risk assessment method according to claim 1, characterized in that: The step of determining the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data includes: Constructing a judgment matrix among the target layer, the criterion layer and the solution layer according to the scoring data; Performing a consistency check on the judgment matrix to obtain a consistency check index, and judging whether the consistency of the judgment matrix meets the requirement based on the consistency check index; When the consistency of the judgment matrix meets the requirement, determining the first initial weight of each risk assessment indicator to the target layer and the second initial weight of each security risk factor to each risk assessment indicator based on the judgment matrix; A weight coefficient is determined according to the first initial weight and the second initial weight.

3. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 2, characterized in that: The judgment matrix is: Where i and j are the i-th and j-th risk assessment indicators or the i-th and j-th safety risk factors, respectively; C ij It represents the importance of the i-th and j-th risk assessment indicators or the i-th and j-th security risk elements relative to the target layer.

4. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 2, characterized in that: The performing consistency check on the judgment matrix includes: Obtaining the number of features of the judgment matrix, and determining the maximum feature root of the judgment matrix according to the number of features; Determining a consistency index based on the maximum characteristic root and the number of characteristics; Determining whether the order of the judgment matrix is ​​greater than a threshold order, and when the order of the judgment matrix is ​​greater than the threshold order, determining an average random consistency index of the same order of the judgment matrix based on the order of the judgment matrix; Determining a random consistency ratio according to the consistency index and the average random consistency index of the same order; When the random consistency ratio is less than the ratio threshold, the consistency of the judgment matrix meets the requirement.

5. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 4, characterized in that: The determining the maximum characteristic root of the judgment matrix according to the number of characteristics comprises: According to the product of the elements of each row of the judgment matrix, the nth root of the product is determined; Determine a weight vector of each security risk factor in the judgment matrix according to the nth root; Normalizing the weight vector to obtain a normalized weight vector; The maximum eigenvalue root is determined according to the normalized weight vector and the number of features.

6. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 4, characterized in that: The consistency index is: The random consistency ratio is: In the formula, CI is the consistency index; is the maximum characteristic root; n is the number of characteristics; CR is the random consistency ratio; RI is the average random consistency index of the same order.

7. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 1, characterized in that: The step of performing a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system to be evaluated to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated includes: Obtaining multiple actual safety risk factors of the liquefied natural gas loading and unloading system to be evaluated; Based on the liquefied natural gas loading and unloading system safety risk assessment model and the multiple actual safety risk factors, obtain a major hazard source determination index value, a major hazard source classification index value, a high-risk equipment index value, a high-risk process index value, a high-risk material index value, a high-risk site index value, a high-risk operation index value, an earthquake index value, a lightning strike and static electricity index value, a flood index value, a typhoon index value, a tornado index value, and a mountain torrent and mudslide index value; Determine the inherent risk assessment index value based on the major hazard source determination index value and the major hazard source classification index value; Determine the dynamic risk assessment index value based on the high-risk equipment index value, high-risk process index value, high-risk material index value, high-risk site index value and high-risk operation index value; Determine disturbance risk assessment index values ​​based on earthquake index values, lightning strike and static electricity index values, flood index values, tornado index values, and mountain torrent and mud-rock flow index values; The safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated is determined according to the inherent risk assessment index value, the dynamic risk assessment index value and the disturbance risk assessment index value.

8. The method for safety risk assessment of liquefied natural gas loading and unloading system according to claim 7, characterized in that: The liquefied natural gas loading and unloading system safety risk assessment method further includes: The safety level of the liquefied natural gas loading and unloading system to be evaluated is determined according to the safety risk assessment value, and the safety risk assessment value and the safety level are transmitted to a display interface for display.

9. A safety risk assessment device for a liquefied natural gas loading and unloading system, characterized in that: include: A safety risk assessment system construction module is used to construct a safety risk assessment index system for a liquefied natural gas loading and unloading system. The safety risk assessment index system for a liquefied natural gas loading and unloading system includes a target layer, a criterion layer, and a solution layer. The target layer is the safety risk value of the liquefied natural gas loading and unloading system. The criterion layer includes multiple risk assessment indicators, and the solution layer includes multiple safety risk factors. A weight coefficient determination module, used to obtain the scoring data of the multiple risk assessment indicators and the multiple security risk factors, and determine the weight coefficients of the criterion layer and the solution layer to the target layer according to the scoring data; A safety risk assessment module, used to establish a safety risk assessment model for a liquefied natural gas loading and unloading system according to the weight coefficient, and to perform a safety risk assessment on the liquefied natural gas loading and unloading system to be evaluated based on the safety risk assessment model for the liquefied natural gas loading and unloading system, so as to obtain a safety risk assessment value of the liquefied natural gas loading and unloading system to be evaluated; The multiple risk assessment indicators include inherent risk assessment indicators, dynamic risk assessment indicators and disturbance risk assessment indicators. The inherent risk assessment indicators include major hazard source determination indicators and major hazard source classification indicators. The dynamic risk assessment indicators include high-risk equipment indicators, high-risk process indicators, high-risk material indicators, high-risk site indicators and high-risk operation indicators. The disturbance risk assessment indicators include earthquake indicators, lightning and static electricity indicators, flood indicators, typhoon indicators, tornado indicators and mountain torrent mudslide indicators. The safety risk assessment index system for liquefied natural gas loading and unloading systems includes the safety risk assessment index system for onshore liquefied natural gas loading and unloading systems and the safety risk assessment index system for offshore liquefied natural gas loading and unloading systems; The major hazard source determination indicators in the safety risk assessment indicator system of onshore LNG loading and unloading systems include the actual amount of methane in the loading and unloading area, the tank diameter of the tank truck, the maximum allowed loading quantity, the average loading and unloading time, the type of tank truck, the unloading method, and the type of accidents in the LNG loading and unloading area; The major hazard source classification indicators in the onshore LNG loading and unloading system safety risk assessment indicator system and the offshore LNG loading and unloading system safety risk assessment indicator system include the number of potentially exposed personnel outside the site, the number of potentially exposed personnel in the LNG loading and unloading area, the correction factor for exposed personnel outside the loading and unloading area, the correction factor for hazardous chemicals in the loading and unloading area, the safety standardization level, and the environmental functional area in which they are located; The major hazard source determination indicators in the safety risk assessment index system of offshore LNG loading and unloading systems include the number of return fans, the actual amount of methane in the loading and unloading area, the number of LNG terminals, the number of LNG berths, the capacity of LNG ships, the number of unloading arms, the number of meteorological returns, and the types of accidents in the LNG loading and unloading area; The high-risk equipment indicators in the safety risk assessment indicator system of onshore liquefied natural gas loading and unloading systems include LNG loading / unloading vehicle skids, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam exhaust pipelines, steam pressure release pipelines, gas pipelines and safety devices; The high-risk equipment indicators in the offshore liquefied natural gas loading and unloading system safety risk assessment indicator system include LNG loading and unloading systems, flanges and valves, loading and unloading vehicles, LNG loading and unloading vehicle pipelines, steam exhaust pipelines, steam pressure release pipelines, gas pipelines and safety devices; The high-risk process indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include unloading process, liquid filling process, gas gathering and transmission system, instrument detection system, and flame and gas leakage monitoring and alarm system; The high-risk substance indicators in the safety risk assessment indicator system for onshore LNG loading and unloading systems and the safety risk assessment indicator system for offshore LNG loading and unloading systems include methane, oxygen content, nitrogen, substance hazard, acetylene and propyne; The high-risk location indicators of the onshore LNG loading and unloading system safety risk assessment index system include: loading / unloading platforms, accident emergency pools, and spacing between loading and unloading equipment; The high-risk location indicators of the offshore LNG loading and unloading system safety risk assessment index system include: docks, accident emergency pools, and the distance between loading and unloading equipment; The high-risk operation indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include loading and unloading operations, blind plate plugging operations, hoisting operations, confined space operations, and pipeline transportation operations; The earthquake indicators in the safety risk assessment index system for onshore LNG loading and unloading systems and the safety risk assessment index system for offshore LNG loading and unloading systems include site, earthquake resistance level, earthquake fortification level and earthquake fortification intensity; The lightning strike and static electricity indicators of the onshore LNG loading and unloading system safety risk assessment indicator system and the offshore LNG loading and unloading system safety risk assessment indicator system include: lightning protection, lightning protection building classification and lightning protection devices; The flood indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: flood control standards, flood season forecasts, flood control dispatch, flood control projects, and emergency response capabilities; The tornado indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: wind speed, level, stability of wind-resistant structural components, and wind-resistant design; The flash flood and mudslide indicators of the safety risk assessment index system for onshore LNG loading and unloading systems include: safety level of prevention and control projects, stability of prevention and control project buildings, monitoring level, and emergency response capabilities; The typhoon indicators of the offshore liquefied natural gas loading and unloading system safety risk assessment index system include: typhoon level, stability of wind-resistant structural components, wind-resistant design, tsunami protection projects and emergency response capabilities.

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