ANSI-ISA-84-00-01-04(P3)
Part 3 (IEC 61511-3 Mod): Functional Safety: Safety Instrumented Systems for the Process Industry Sector - Part 3: Guidance for the Determiniation of the Required Safety Integrity Levels - Informative ISBN: 978-1-55617-921-1
Published: 2004
Length: 66 pages

Price: $204.00

Part 3 provides information on:

• the underlying concepts of risk, the relationship of risk to safety integrity, see Clause 3;
• the determination of tolerable risk, see Annex A;
• a number of different methods that enable the safety integrity levels for the safety instrumented functions to be determined, see Annexes B, C, D, E, and F.

In particular, this part:

• applies when functional safety is achieved using one or more safety instrumented functions for the protection of either personnel, the general public, or the environment;
• may be applied in non-safety applications such as asset protection;
• illustrates typical hazard and risk assessment methods that may be carried out to define the safety functional requirements and safety integrity levels of each safety instrumented function;
• illustrates techniques/measures available for determining the required safety integrity levels;
• provides a framework for establishing safety integrity levels but does not specify the safety integrity levels required for specific applications;
• does not give examples of determining the requirements for other methods of risk reduction.