TW201314607A - Integrated analysis method of process risk evaluation - Google Patents

Abstract

This invention provides an integrated analysis method of process risk evaluation to be cooperatively executed by a server or program. First, deviation guidewords are used to examine process deviation and list all causes, followed by analyzing associated hazard results and current safety measures and evaluating the severity level of the risk. A tolerable risk target frequency is determined according to the severity level. If the severity level is significant or higher, protection layer analysis is carried out, followed by the risk evaluation. If the tolerable risk target frequency is reached, likelihood and risk level are determined, and operative improvement recommendations are proposed as needed. If the tolerable risk target frequency is not reached yet, safety level requirement should be determined to further determine the suggestions for other risk prevention or risk elimination measures. Accordingly, a risk evaluation analysis method with consistent evaluation criterion and high efficiency can be achieved.

Description

Integrated analysis method for process risk assessment

The present invention relates to an integrated analysis method for process risk assessment, especially for a risk assessment analysis method in which cocoa achieves consistent assessment criteria and high efficiency.

According to Hazard and Operability Study (HAZOP), it is the main process safety assessment and risk analysis method for petrochemicals and manufacturing and hazardous chemicals process industries, and this prior art uses deviation guidance words. (Deviation Guidewords) combines process parameters to develop process deviations, and the process safety assessment team systematically and carpet-likely identifies all possible process hazards, hazards, and assesses the need and effectiveness of safety precautions. Whether the risk is acceptable.

Although the aforementioned safety assessment method has the advantages of comprehensiveness and traceability, it is costly to evaluate, and the estimation of risk possibility in risk assessment is often supported by lack of statistical data, which leads to risk. The benchmark for evaluation cannot be consistent.

In view of the shortcomings of the above-mentioned integrated analysis method of process risk assessment, the inventor feels that he has not perfected it, exhausted his mental research and overcome it, and developed a process risk based on his accumulated experience in the industry for many years. The integrated analysis method of the assessment, in order to achieve a risk assessment analysis method with consistent benchmarks and high efficiency.

To achieve the above objectives, the integrated analysis method of the process risk assessment of the present invention is performed in conjunction with a related server or software, and includes the following steps: Step 1: Deviating from the process in the process by the process deviation test word, and listing All possible causes of deviation of each process, and analysis of relevant hazard consequences and identification of deviations from existing security measures; Step 2: assess the severity level of risk; Step 3: Determine the tolerable risk target frequency by severity level; Step 4 : If the severity level is significant or significant, the protection layer analysis will be performed; Step 5: The risk assessment will be carried out again. If the risk target frequency has been tolerated, the probability level and risk level will be determined, and then the operation will be carried out as needed. Sexual improvement recommendations; and Step 6: If the tolerable risk target frequency is not met in Step 5, the safety level requirements should be determined, and then other risk prevention or risk mitigation measures should be determined, and safety improvement recommendations should be made accordingly.

In order to fully understand the objects, features and advantages of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings. 7 is a schematic diagram of an implementation structure of the present invention, a schematic diagram of a flow state of the present invention, a schematic diagram of a severity classification data of the present invention, a schematic diagram of a tolerable risk target data of the present invention, a schematic diagram of a protective layer analysis data of the present invention, and a schematic diagram of the present invention The possibility of defining the invention is a schematic diagram of the data and a schematic diagram of the risk assessment matrix of the present invention. As shown in the figure: the integrated analysis method of the process risk assessment of the present invention is executed in conjunction with the relevant server 1 or software, and the software can be built in the computer 2 and analyzed by the server 1 in the following steps, and the analysis is performed. At least the following steps are included: Step 1: Deviate from the process in the process to test the deviation of the process in the node, and list all possible causes of deviation of each process, and analyze the relevant hazard consequences and identify the existing safety measures to prevent deviation.

Step 2: Assess the severity level of the risk.

Step 3: Determine the risk target frequency that can be tolerated by the severity level.

Step 4: If the severity level is significant or significant, a protective layer analysis will be performed.

Step 5: Perform a risk assessment again. If the target frequency of the tolerable risk has been reached, determine the probability level and risk level, and then propose operational improvements as needed.

Step 6: If the tolerable risk target frequency is not met in step 5, the safety level requirement should be determined, and then other risk prevention or risk reduction measures should be decided, and safety improvement suggestions should be proposed accordingly.

Based on the above steps, an implementation flow is described as follows: first select the node to start analyzing S100 (the node mentioned here is one of the stages of a certain process), and after the selection, the process deviation test is used to test The possible process in the node deviates from s101 (and the boot word is the keyword of the event occurrence), lists all possible causes s102, analyzes the hazard consequences associated with the deviation (assuming all protection fails) s103, and identifies the deviation prevention There are security measures s104. At this time, the severity level s105 of the consequences can be evaluated in conjunction with the severity classification data 3, and the tolerable risk target data 4 can be used to determine whether the severity s106 can be determined. Otherwise, the result analysis s107, if yes, determine whether The severity is 4/5 s108. If the severity reaches 4/5, the protective layer analysis s109 is performed, and the protective layer analysis is combined with the protective layer analysis data 5, and the following principles are considered and judged:

(1) Impact event description: Copy and extend the analytical consequences of assessing the severity level of the consequences.

(2) Severity: The level of severity is copied and extended.

(3) Initiating cause: All possible causes should be discussed item by item.

(4) Initiation lidelihood: Link and search the initial event failure rate database.

(5) General process design: Does it follow the general safety design specifications, such as API, ASME, NFPA, regional explosion-proof grades and other industrial standards or specifications to implement the design? There are (0.1); none (1).

(6) Basic Program Control System Analysis (BPCS): In addition to the failed control system, it is related to monitoring systems such as DCS, PLC, and PANEL. There are (0.1); none (1).

(7) Alarm analysis (Alarms, ect.): independent security system alarm, alarms other than the automated operating systems in items (4) and (6), and SOPs with corresponding events, (0.1); (1).

(8) Addittioal mitigation (restricted access): for example, process safety management procedures, work permits, and plant personnel control, but for the initial event, there are (0.1); none (1).

(9) Independent protection layer analysis (IPL additional mitigation, dike, pressure relief): reduction system, for example: anti-overflow, safety valve, rupture disc, automatic fire sprinkler system, link and search the protective layer event database.

(10) Intermediate event likelihood: the product of items (4) to (9).

(11) Safety instrument system SIF integrity level: The probability of failure (PFD) corresponding to SIL.

(12) Mitigated event lidelihood: The probability of failure event after risk control, that is, the risk must be less than the tolerable risk target, as detailed in the severity classification data3.

After the protection layer analysis s109 is completed, it is confirmed whether the tolerable risk target s110 has been reached, and if so, the probability definition data 6 is used to evaluate the probability level s111 of the consequences, and the risk assessment matrix data 7 is used to evaluate the risk level s112, and then It is judged whether the risk is less than or equal to 4 S113, and if it is less than or equal to 4, the security level requirement s114 is determined, and then the SIF of the SIF or other risk prevention/reduction strategy s115 is determined, and the safety improvement suggestion s116 is proposed, and finally all the guide words s117 are repeated. Perform another analysis. If the risk is not less than or equal to 4, the operational improvement suggestion s118 is proposed and then all guide words s117 are repeated; and when it is judged whether the severity is 4/5 s108, if the severity is less than 4/5, then directly The risk level s112 is evaluated in conjunction with the risk assessment matrix data 7.

As described above, the present invention fully complies with the three requirements of the patent: novelty, advancement, and industrial applicability. In terms of novelty and advancement, the present invention is an integrated analysis method for process risk assessment, which can achieve a risk assessment analysis method with consistent benchmarks and high efficiency; and in terms of industrial availability, the invention is derived The products can fully meet the needs of the current market.

The invention has been described above in terms of preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and limitations equivalent to the embodiments are subject to the definition of the scope of the following claims.

1. . . server

2. . . computer

3. . . Severity classification data

4. . . Tolerable risk target data

5. . . Protective layer analysis data

6. . . Probability definition data

7. . . Risk assessment matrix data

S100. . . Select node to start analysis

S101. . . Deviation of possible process deviations in the node by the process deviation guide word

S102. . . List all possible causes

S103. . . Analyze the hazard consequences associated with deviations (assuming all protections fail)

S104. . . Identify existing security measures to prevent deviations

S105. . . Assess the severity level of the consequences

S106. . . Whether it can determine the severity

S107. . . Result analysis

S108. . . Severity up to 4/5

S109. . . Performing protection layer analysis

S110. . . Has it reached a tolerable risk target?

S111. . . Assess the likelihood level of the consequences

S112. . . Assess risk level

S113. . . Whether the risk is less than or equal to 4

S114. . . Determine security level requirements

S115. . . Determine SIF's SIL or other risk prevention/reduction strategies

S116. . . Propose safety improvement recommendations

S117. . . Repeat all guide words

S118. . . Proposed operational improvement recommendations

Figure 1 is a schematic diagram of an implementation architecture of the present invention.

Figure 2 is a schematic view of the flow state of the present invention.

Figure 3 is a schematic diagram of the severity classification data of the present invention.

Figure 4 is a schematic diagram of the tolerable risk target data of the present invention.

Figure 5 is a schematic diagram of the protective layer analysis data of the present invention.

Figure 6 is a schematic diagram of the definition of the possibilities of the present invention.

Figure 7 is a schematic diagram of the risk assessment matrix of the present invention.

S100. . . Select node to start analysis

S101. . . Deviation of possible process deviations in the node by the process deviation guide word

S102. . . List all possible causes

S103. . . Analyze the hazard consequences associated with deviations (assuming all protections fail)

S104. . . Identify existing security measures to prevent deviations

S105. . . Assess the severity level of the consequences

S106. . . Whether it can determine the severity

S107. . . Result analysis

S108. . . Severity up to 4/5

S109. . . Performing protection layer analysis

S110. . . Has it reached a tolerable risk target?

S111. . . Assess the likelihood level of the consequences

S112. . . Assess risk level

S113. . . Whether the risk is less than or equal to 4

S114. . . Determine security level requirements

S115. . . Determine SIF's SIL or other risk prevention/reduction strategies

S116. . . Propose safety improvement recommendations

S117. . . Repeat all guide words

S118. . . Proposed operational improvement recommendations

Claims (6)

An integrated analysis method for process risk assessment is performed in conjunction with a related server or software, and includes the following steps: Step 1: Deviate the process deviation in the process by the process deviation guide word, and list all possible causes of deviation of each process. And analyze the relevant hazard consequences and identify the existing safety measures to prevent deviation; Step 2: Evaluate the severity level of the risk; Step 3: Determine the tolerable risk target frequency by the severity level; Step 4: If the severity level is significant and If the major is above, the protection layer analysis will be performed; Step 5: The risk assessment will be carried out again. If the tolerable risk target frequency has been reached, the probability level and risk level will be determined, and then the operational improvement suggestions will be proposed as needed; and Step 6: If the tolerable risk target frequency is not met in step 5, the safety level requirement should be determined, and then other risk prevention or risk reduction measures should be decided, and safety improvement suggestions should be proposed accordingly. For example, the integrated analysis method of the process risk assessment described in claim 1 of the patent scope, wherein the second step is to evaluate the severity level of the risk by using the severity classification data. For example, the integrated analysis method for process risk assessment described in item 1 of the patent application scope, wherein the third step is to match the tolerable risk target data to determine the tolerable risk target frequency. For example, the integrated analysis method of the process risk assessment described in the first application of the patent scope, wherein the fourth step is performed with the protection layer analysis data and the tolerable risk target data to perform the protection layer analysis. For example, the integrated analysis method of the process risk assessment described in claim 1 of the patent scope, wherein the step 4 performs at least the event consequence analysis, the severity analysis, the initial failure event analysis, and the initial failure when performing the protection layer analysis. Event probability analysis, general process design analysis, basic program control system analysis, alarm analysis, operational safety management analysis, independent protection layer analysis, intermediate event possibility analysis, safety instrument system completeness level analysis, and event likelihood analysis after reduction . For example, the integrated analysis method of the process risk assessment described in the first paragraph of the patent application, wherein the fifth step determines the probability level and the risk level by using the possibility definition data and the risk assessment matrix data.