ISA TR84.00.02-2002 - Part 2
- Safety Instrumented Functions (SIF) - Safety Integrity Level (SIL) Evaluation Techniques Part 2: Determining the SIL of a SIF vi
- standard by The International Society of Automation, 06/17/2002
- Category: ISA
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1 Scope
1.1 ISA-TR84.00.02-2002 - Part 2 is informative and does not contain any mandatoryrequirements. This part of the technical report is intended to be used only after a thoroughunderstanding of ISA-TR84.00.02-2002 ? Part 1, which defines the overall scope. ISATR84.00.02-2002 - Part 2 provides:
a) technical guidance in Safety Integrity Level (SIL) Analysis;
b) ways to implement Safety Instrumented Functions (SIF) to achieve a specified SIL;
c) failure rates and failure modes of SIF components;
d) diagnostics, diagnostic coverage, covert faults, test intervals, redundancy of SIF components;
e) tool(s) for SIL verification of SIF.
1.2 ISA-TR84.00.02-2002 - Part 2 provides one possible technique for calculating PFDavgvalues for Safety Instrumented Functions (SIF) installed in accordance with ANSI/ISA-84.01-1996, ?Application of Safety Instrumented Systems for the Process Industries?.
1.3 ISA-TR84.00.02-2002 - Part 2 provides the engineer(s) performing design for a SIF with arelatively simple technique generally following the simplified equation approach for assessing thecapability of the designed SIF.
1.4 The procedures outlined in ISA-TR84.00.02-2002 - Part 2 provide the engineer with stepsto follow in estimating a mathematical value for PFDavg for typical configurations of SIF designedaccording to ANSI/ISA-84.01-1996. This procedure is appropriate for SIL 1 and SIL 2 SIFs. Thisprocedure should not be used for SIL 3 SIFs unless the User has a thorough understanding of theSIL Verification mathematics and fully understands the limitations of the simplified equations.
1.5 ISA-TR84.00.02-2002 - Part 2 does not cover modeling of external communications oroperator interfaces. The SIL analysis includes the SIF envelope as defined by ANSI/ISA-84.01-1996 (see Figure I.2).
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