【Standards and Specifications】The “Guidelines for Compiling Safety Requirements Specifications (SRS) for Safety Instrumented Systems (SIS)” have been issued and put into effect
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This post was last edited by zhoudingshengs on 2025-3-20 at 08:59. 2.jpg The standard T/CCSAS 054—2025, \"Guidelines for the Preparation of Safety Requirements Specifications (SRS) for Safety Instrumented Systems (SIS)\", was issued and put into effect on March 3. This standard helps chemical enterprises standardize the requirements for preparing safety requirement specifications, ensuring the proper design and implementation of safety instrumented systems. Also, those who need to learn * can leave their email address; I will send it to you when I have time.
Since the issuance of the **General Administration of Work Safety’s Guidelines on Strengthening the Management of Safety Instrumented Systems in the Chemical Industry** in 2014, greater attention has been paid to safety instrumented systems. Initially, the focus was on whether such systems were installed at all, but now there is an emphasis on whether they are installed correctly. An important aspect in ensuring that safety instrumented systems are properly configured and operated is the preparation of safety requirement specifications. In addition, an increasing number of standards, specifications, and documents also call for the preparation of safety requirement specifications, such as the \"Guidelines for Safety Management of Chemical Processes\" (AQ/T 3034-2022) and the \"Design Specifications for Safety Instrumented Systems in Petrochemical Industries\" (GB/T 50770-2013).
This standard provides guidance on aspects such as the general requirements for drafting safety requirement specifications, key steps and processes, input materials, content, and document structure. It offers explanations and requirements regarding concepts that are prone to confusion, as well as key areas and contents of concern. It serves as technical support and reference examples for the implementation of documents and standards such as the \"Guiding Opinions of the State Administration of Work Safety on Strengthening the Management of Safety Instrumented Systems in the Chemical Industry\" (An Jian Zong Guan San [2014] No. 116), the \"Design Code for Safety Instrumented Systems in Petrochemical Industries\" (GB/T 50770-2013), and \"Functional Safety of Safety Instrumented Systems in the Process Industry\" (GB/T 21109). It helps to enhance the management of safety instrumented systems throughout their lifecycle and to meet the actual needs of engineering projects.
The example of a safety requirement specification provided in Appendix D of this standard is not a standard requirement but merely an example. The degree expressions in the sample clauses are also merely for illustration and do not constitute standard requirements. Subject to meeting standard specifications and regulatory requirements, different engineering companies and enterprises may have varying options.
Safety Supervision General Administration Document No. 3 [2014] 116: Guidelines for Strengthening the Management of Process Safety Instrumented Systems: (IV) Prepare technical documents specifying the safety requirements for safety instrumented systems, in accordance with the functional and integrity requirements of all safety instrument functions. (5) Design and implement safety instrument functions in strict accordance with the technical documents specifying the safety requirements for safety instrument systems. (VI) After the construction unit has completed the installation and commissioning in accordance with the design documents, the enterprise shall, prior to putting the system into operation, organize a review and joint verification of the safety instrument system in line with **laws and regulations, standards and specifications, industry and enterprise safety management requirements, as well as technical documents related to safety requirements. This is to ensure that the safety instrument system possesses the intended functions and meets the integrity requirements, thereby being ready for safe operation.
AQ/T 3034-2022 Guidelines for Safety Management in Chemical Processes: 4.11.2 Management of Safety Instrumented Systems (SIS) 4.11.2.1 Enterprises shall determine the necessary safety instrument functions and the associated risk reduction requirements through risk assessment; technical documents specifying the safety requirements shall be prepared in accordance with the functional and integrity requirements of such safety instruments.
GB/T 50770-2013 Code for Design of Safety Instrumented Systems in Petrochemical Industries (Partial Revision _ Draft for Public Comment by the Ministry of Housing and Urban-Rural Development): The safety technical requirements for safety instrumented systems can be specified by preparing a document outlining those requirements. The content of the safety requirement specification should include all safety instrument functions and the requirements related to their safety integrity levels, the hardware requirements for the safety instrument system, and the safety requirements for the applications.
Jing Ying Ji Tong [2020] No. 38: Notice from the Beijing Emergency Management Bureau on Further Advancing the Special Rectification Work for Chemical Process Safety Instrumentation Systems. 1. To carry out the design of chemical process safety instrumentation systems in a standardized manner, it is necessary to follow the \"Technical Guidelines for the Special Rectification of Chemical Process Safety Instrumentation Systems in Beijing.\" Design firms with the appropriate qualifications should be commissioned to prepare technical documents specifying the safety requirements for such systems, such as the Safety Requirement Specification (SRS), based on the results of assessments and grading, so as to carry out the design work.
Given that SIS is related to the safety of personnel, equipment, and the environment, various countries have established relevant standards and regulations to ensure that the design, manufacturing, and use of SIS are carried out in an orderly manner. And authoritative certification bodies verify the safety level that the products can achieve. The main standards, specifications, and certification bodies include: (1) the industry standard SHB-Z06-1999 \"Guidelines for the Design of Emergency Shutdown and Safety Interlock Systems in the Petrochemical Industry\", established by China’s petrochemical groups. (2) In 2006 and 2007, Chinese standards GB/T20438 and GB/T21109, which also adopt IEC61508 and IEC61511, were successively issued; thus China’s functional safety standards began to regulate functional safety practices in the country.
(3) The IEC 61508/61511 standards established by the International Electrotechnical Commission in 1997 specify the hardware, software, and applications for safety interlock systems composed of electromechanical devices (relays), solid-state electronic devices, and programmable electronic devices (PLCs). (4) ISA-S84.01-1996 \"Application of Safety Instrumented Systems in the Process Industry\", established by the American Institute of Instrumentation.
(5) AICHE (CCPS)-1993, Guidelines for the Safe Automation of Chemical Processes, established by the American Institute of Chemical Engineers. (6) HSE PES-1987, developed by the Health and Safety Executive in the UK, \"Applications of Programmable Electronic Systems in Safety.\"