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OVE EN 61511-3:2019
Functional safety - Safety instrumented systems for the process industry sector - Part 3: Guidance for the determination of the required safety integrity levels (IEC 61511-3:2016) (english version)
This part of IEC 61511 provides information on: - the underlying concepts of risk and the relationship of safety to safety integrity (see Clause A.4); - the determination of tolerable risk (see Annex K); - the Safety Integrity Level (SIL) for the safety instrumented functions (SIF) to be determined (see Annexes B through K); Determining the ability to achieve the desired risk reduction (see Annex J). In particular, this part of IEC 61511: (a) applies when functional safety is one or more SIF for the protection of either personnel, the general public, or the environment; b) may be applied in non-safety applications such as asset protection; (c) the safety and operational requirements and SIL of each SIF; (d) techniques / measures available for determining the required SIL; e) provides a framework for establishing SIL but does not specify the SIL required for specific applications; f) does not give examples of determining the requirements for other methods of risk reduction. Annexes B through K illustrate quantitative and qualitative approaches and have been simplified in order to illustrate the underlying principles. These annexes have been prepared to illustrate the general principles of a number of methods but do not provide a definitive account. e) provides a framework for establishing SIL but does not specify the SIL required for specific applications; f) does not give examples of determining the requirements for other methods of risk reduction. Annexes B through K illustrate quantitative and qualitative approaches and have been simplified in order to illustrate the underlying principles. These annexes have been prepared to illustrate the general principles of a number of methods but do not provide a definitive account. e) provides a framework for establishing SIL but does not specify the SIL required for specific applications; f) does not give examples of determining the requirements for other methods of risk reduction. Annexes B through K illustrate quantitative and qualitative approaches and have been simplified in order to illustrate the underlying principles. These annexes have been prepared to illustrate the general principles of a number of methods but do not provide a definitive account.
Austrian Standards Institute [on]