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ISA 61511-3-2018 provides information on:
- the underlying concepts of risk and the relationship of risk to safety integrity (see Clause A.4);
- the determination of tolerable risk (see Annex K);
- a number of different methods that enable the safety integrity level (SIL) for the safety instrumented functions (SIF) to be determined (see Annexes B through K);
- the impact of multiple safety systems on calculations determining the ability to achieve the desired risk reduction (see Annex J).
In particular, this part of IEC 61511:
- 1.applies when functional safety is achieved using one or more SIF for the protection of either personnel, the general public, or the environment;
- 2.may be applied in non-safety applications such as asset protection;
- 3.illustrates typical hazard and risk assessment methods that may be carried out to define the safety functional requirements and SIL of each SIF;
- 4.illustrates techniques/measures available for determining the required SIL;
- 5.provides a framework for establishing SIL but does not specify the SIL required for specific applications;
- 6.does not give examples of determining the requirements for other methods of risk reduction.
Product Details
- Published:
- 07/11/2018
- ANSI:
- ANSI Approved
- Number of Pages:
- 124