ISA-TR84.00.04 PART 1 : 2020

ISA-TR84.00.04-2020 – Part 1, Guidelines for the Implementation of ANSI/ISA-61511-1:2018, is a comprehensive guide to implementing ANSI/ISA-61511-1:2018, the standard for safety instrumented systems (SIS) in process industries. It addresses key lifecycle phases, including hazard and risk assessment, allocation of safety functions, SIS design, verification and validation, operation, maintenance and management of change (MoC). This technical report emphasizes practical approaches such as evaluating existing SIS (“grandfathering”), managing functional safety through defined roles and responsibilities, conducting functional safety assessments and audits, selecting devices based on prior use and IEC 61508 certification, following application programming best practices and meeting detailed documentation requirements, including safety manuals. Annexes provide thorough guidance on topics like alarm management, fault tolerance, BPCS relationships, SIL verification and performance indicators, assisting users in achieving and maintaining required safety integrity levels throughout the SIS lifecycle.