ISA TR84.00.04 PART 1

Purpose

ANSI/ISA-84.01-1996, Application of Safety InstrumentedSystems for the Process Industries, was replaced in2004 by ANSI/ISA-84.00.01-2004 Parts 1-3 (IEC 61511 Modified),Functional Safety: Safety Instrumented Systems for the ProcessIndustry Sector. The three-part series is the United Statesadoption of the international standards, IEC 61511 Parts 1-3, andincludes one additional clause, a “grandfather clause” coveringexisting safety instrumented systems (see ANSI/ISA-84.00.01-2004Part 1 Clause 1.0 y).

This Part 1 technical report provides guidance related to thetransition of programs developed for the 1996 standard to onecompliant with the intent of the 2004 standards. This Part 1technical report also includes 16 informative annexes providingguidance from the ISA-SP84 committee on a wide range of topicsrelated to the new standards. A companion technical report,ISA-TR84.00.04-2005 Part 2, provides an example illustrating someof the lifecycle steps in ANSI/ISA-84.00.01-2004.

This Part 1 technical report contains four main clauses. Clause1 is the purpose. Clause 2 explains the origins ofANSI/ISA-84.00.01-2004 and discusses its relationship to otherregulations, standards, and practices. Clause 3 and Annex Aspecifically address the grandfather clause and provide guidance onthe evaluation of existing safety instrumented systems. Clause 4assists the owner/operator in the transition fromANSI/ISA-84.01-1996 to ANSI/ISA-84.00.01-2004.

NOTE: Throughout this technical report, the term”ISA-84.01-2004″ is used to refer to ANSI/ISA-84.00.01-2004 Parts1-3 (IEC 61511 Modified). The term “ISA-84.01-1996” is used torefer to ANSI/ISA-84.01-1996.

See Annex R of this technical report for a list of referencesfor all documents cited herein.

Edition:

05

Published:

01/01/2005

ANSI:

ANSI Approved

Number of Pages:

220

File Size:

1 file , 10 MB