84.00.01
ANSI/ISA-84.00.01-2004 Parts 1-3 (shrink-wrapped) ANSI/ISA-84.00.01-2004 Parts 1-3 (shrink-wrapped)
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Part 1 gives requirements for the specification, design, installation, operation and maintenance of a safety instrumented system, so that it can be confidently entrusted to place and/or maintain the process in a safe state. This standard has been developed as a process sector implementation of IEC 61508.

Part 2 provides guidance on the specification, design, installation, operation and maintenance of Safety Instrumented Functions and related safety instrumented system as defined in ANSI/ISA-84.00.01-2004 Part 1 (IEC 61511-1 Mod). For existing SIS designed and constructed in accordance with codes, standards, or practices
prior to the issue of this standard (e.g., ANSI/ISA-84.01-1996), the owner/operator shall
determine that the equipment is designed, maintained, inspected, tested, and operating in a safe manner.

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, Part 3:
a) 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;
b) may be applied in non-safety applications such as asset protection;
c) 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;
d) illustrates techniques/measures available for determining the required safety integrity
levels;
e) provides a framework for establishing safety integrity levels but does not specify the safety
integrity levels required for specific applications;
f) does not give examples of determining the requirements for other methods of risk reduction.