ISA TR84.00.02-3 : 2002

Foreword
Introduction
1 Scope
2 References
3 Introduction to Fault Tree Analysis
4 Definition of terms and symbols
5 Assumptions for Fault Tree calculations for a SIF
6 Procedure
  6.1 Step 1 - SIF description and application information
  6.2 Step 2 - Top event identification
  6.3 Step 3 - Construction of the fault tree
  6.4 Step 4 - Qualitative review of the fault tree structure
  6.5 Step 5 - Quantitative evaluation of fault tree
  6.6 Step 6 - Documentation of FTA Results
7 Base case example calculation for an SIF using FTA - without
  common cause failures and systematic failures
  7.1 Base case example SIF calculation
  7.2 Case 7.2 PFD[avg] calculation (more frequent functional
      test interval)
  7.3 Case 7.3 PFD[avg] calculation (logic solver with higher
      MTTF[D])
8 Example FTA calculations for an SIF including common cause
  and systematic failure
  8.1 Case 8.1 - SIF with incorrect transmitter calibration
  8.2 Case 8.2 - SIF with incorrect transmitter calibration
      with procedural safeguard
Annex A (informative) - Fault tree symbols and logic
Annex B (informative) - Mathematics
Annex C - Index

Describes: 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; and e) tool(s) for SIL verification of SIF.