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I recommend an excellent, permanently free SIL verification software: An Jian Zong Guan San (2014) No. 116. The management of safety instrument systems will soon be linked to the Safety Production License. For old installations and new projects that do not have safety instrumented systems in place or for which SIL classification and verification have not been carried out, new \"Work Safety Licenses\" will no longer be issued, which will further strengthen the management and requirements regarding work safety in these enterprises. The Three-Year Action Plan for Special Rectification of Work Safety across the Country in 2020: Continued efforts will be made to improve the installation of leak detection and alarm systems, emergency shut-off devices, and automated control systems in production facilities and storage units that are considered “two key areas and one major hazard.” By the end of 2020, the installation rate and utilization rate of such systems and equipment in these facilities must reach 100%; those that fail to meet this requirement or are not in use must cease operations for rectification. The safety integrity assessment includes SIL classification and SIL verification. SIL classification generally employs the Layer of Protection Analysis (LOPA) method to determine what level of safety integrity the Safety Instrumented Function (SIF) needs to achieve; the key parameters are PFD (probability of failure under demand) and RRF (risk reduction factor). The SIL verification can be regarded as a confirmation and review process of the previous SIL classification report. By calculating the failure probabilities of the sensor components, logic operator components, and final actuator components in the SIF circuit, it is determined whether the average PFD value of the SIF circuit meets the requirements specified in the SIL classification report. The IEC61508 and GBT20438 standards on Functional Safety for Electrical, Electronic, and Programmable Electronic Safety-Related Systems specify several methods for SIL evaluation, such as the block diagram method, fault tree analysis, and Markov algorithms. Some design institutes manually calculate the average PFD of SIF circuits by using block-diagram-based algorithms, while other companies purchase E*DA software to compute the average PFD value using Markov algorithms. In recent years, domestic SIL calculation software has emerged in large numbers. Here, I would like to recommend a permanently free domestic SIL calculation software. This software features clear logic and simple operation; if you are familiar with the business logic behind SIL calculations, you can start using it without any training required. In 2020, the HAZOPkit software released a permanently free learning version*, which is highlighted for the following reasons: 1. It is the first SIL calculation software in China to be comparable to e*da software. (Compliance means that the functions and calculation results are essentially identical.) 2. The data results of the SIL certificates issued by internationally renowned third-party certification bodies such as TUV, E*DA, BV, etc., are perfectly consistent. 3. It integrates the most comprehensive equipment failure database in China, and also collects databases from authoritative industry sources such as e*da, PDS, and oreda. 4. It employs an advanced and accurate Markov model, ensuring precise calculations that are in line with the actual business scenarios of SIF circuit failures. 5. Complies with various standards and regulatory requirements specific to different industries. 6. The development team includes industry experts from Tsinghua University, Zhejiang University, Zhejiang University of Technology, and others. Regarding the software interface, the download address is: 【http://121.196.19.230:8899/actionapi/File/getDownloadFile?folderName=app&fileName=HAZOPkitV2.0(try).exe】. Copy all the content within the brackets and paste it into the browser to start downloading. Once installation is complete, you can apply for a trial version.