【Haichuan Chemical Salary News】Design and Application of Safety Instrumented Systems sowie Classification and Verification of Integrity Levels (SIL)
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(1) Regulatory requirements: In accordance with the requirements set out in Document No. 116 issued by the former State Administration of Work Safety, titled \"Guiding Opinions on Strengthening the Management of Safety Instrumented Systems in the Chemical Industry,\" for new installations, as of January 1, 2018, work safety supervision agencies in various regions have gradually required that new projects falling under the category of \"two key areas and one major project\" undergo SIL grading and verification. For existing installations, an assessment of their complete safety instrumented systems must be completed by the end of 2019, followed by necessary corrective actions. Some key provinces have already carried out comprehensive SIL assessments, and the management of safety instrumented 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, nor have undergone SIL classification and verification, new \"Work Safety Licenses\" will no longer be issued, which will further strengthen the management and requirements regarding work safety for enterprises. Therefore, how to draw on the relevant experience of provinces that have successfully carried out SIL assessments, and what the future development trends will be, are issues of key concern for safety supervision agencies at all levels, corporate headquarters, engineering companies, and others.
(2) Issuance of standards: Since 2013, domestic standards for the design and evaluation of SIS systems have been successively issued, such as GBT50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries and AQT3054-2015 Guidelines for the Application of Layer of Protection Analysis (LOPA). However, these standards present certain technical barriers and require a high level of professional expertise. Therefore, determining the appropriate standard scale – one that meets the required standards while also allowing for reasonable cost reduction and ensuring reliability – remains a challenge for design institutes, manufacturing enterprises, instrument suppliers, and others.
(3) Technical barriers: The Safety Instrumented System (SIS) is an important protective barrier and effective measure for safe production in the petrochemical industry. The SIF function allocation in SIS, as well as the determination, design, installation, acceptance, and maintenance of SIL levels, cover the entire life cycle of the device. Completing this work requires the involvement of process designers, safety instrument designers, installers, commissioning personnel, and maintenance staff; therefore, it is necessary for professionals to ensure accurate control over every aspect of the safety system’s life cycle. In the overall life cycle management of SIS systems, the required knowledge includes expertise in chemical processes and process hazard analysis; in addition, a thorough understanding of the details related to the design and selection of safety instruments, as well as their testing and maintenance, is necessary. Therefore, high technical capabilities are demanded from the personnel involved.
Therefore, how to conduct a proper process hazard analysis and determine the SIL level of SIFs, as well as how to select the appropriate components for each element of the SIF circuit (instrumentation, SIS, and valves), and how to verify the designed SIF circuits to ensure they meet standard requirements, are also issues that trouble design firms and related manufacturing enterprises.
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