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21 Ιαν 2016 · The IEC 61511 Standard requires the user to create a Safety Requirements Specification (SRS) for a Safety Instrumented System (SIS) that incorporates all the analysis done during the Risk Assessment, HAZOP/PHA and LOPA reviews.
10 Σεπ 2019 · The SRS needs to describe how and when a SIF is put into service and also how and when it is bypassed or removed from service. These descriptions need to be explicit and define what the detailed design needs to enable. SIF Performance – The SRS must define the performance requirements for each SIF.
specification of the Safety Functions. The SRS requirements in IEC 61511 and ISA 84.00.01-2004 are intended to address this fundamental gap by defining the minimum requirements for specification of functional and basic design requirements that are to be included in a SRS that is prepared prior to detailed design, installation, and operation.
Item. SRS Requirement. A description of all the safety instrumented functions necessary to achieve the required functional safety. 2. Requirements to identify and take account of common cause failures. 3. A definition of the safe state of the process for each identified safety instrumented function. 4.
The IEC 61511 standard specifies the general requirements for a SRS. It is important that a SRS is clear, concise, complete and consistent. The SRS should contain the functional and integrity requirements for each Safety Instrumented Function (SIF).
16 Μαΐ 2018 · Writing SRS: format and content. SRS format should be divided into 3 components: General requirements; Functional requirements; Integrated security requirements. Regarding contents, it must include: Design and architecture; Reliability; SIL (Safety Integrity Level);
22 Απρ 2019 · Safety requirements specifications (SRS) are specifications that describe every required safety function that must be performed by a safety instrumented system (SIS). SRSs specify both what safety functions must be performed by a system and how well those functions must be performed.
