UNITED STATES NATIONAL FOREWORD
IEC FOREWORD
INTRODUCTION
1 Scope
2 Definitions and abbreviations
3 Risk and safety integrity - general guidance
  3.1 General
  3.2 Necessary risk reduction
  3.3 Role of safety instrumented systems
  3.4 Safety integrity
  3.5 Risk and safety integrity
  3.6 Allocation of safety requirements
  3.7 Safety integrity levels
  3.8 Selection of the method for determining the
       required safety integrity level
Annex A (informative) As Low As Reasonably Practicable
        (ALARP) and tolerable risk concepts
  A.1 General
  A.2 ALARP model
Annex B (informative) Semi-quantitative method
  B.1 General
  B.2 Compliance to ANSI/ISA-84.00.01-2004 Part 1
  B.3 Example
Annex C (informative) The safety layer matrix method
  C.1 Introduction
  C.2 Process safety target
  C.3 Hazard analysis
  C.4 Risk analysis technique
  C.5 Safety layer matrix
  C.6 General procedure
Annex D (informative) Determination of the required safety
        integrity levels - a semi-qualitative method:
        calibrated risk graph
  D.1 Introduction
  D.2 Risk graph synthesis
  D.3 Calibration
  D.4 Membership and organization of the team undertaking
       the SIL assessment
  D.5 Documentation of results of SIL determination
  D.6 Example calibration based on typical criteria
  D.7 Using risk graphs where the consequences are
       environmental damage
  D.8 Using risk graphs where the consequences are asset
       loss
  D.9 Determining the integrity level of instrument
       protection function where the consequences of failure
       involve more than one type of loss
Annex E (informative) Determination of the required safety
        integrity levels - a qualitative method: risk graph
  E.1 General
  E.2 Typical implementation of instrumented functions
  E.3 Risk graph synthesis
  E.4 Risk graph implementation: personnel protection
  E.5 Relevant issues to be considered during application
       of risk graphs
Annex F (informative) Layer of protection analysis (LOPA)
  F.1 Introduction
  F.2 Layer of protection analysis
  F.3 Impact event
  F.4 Severity Level
  F.5 Initiating cause
  F.6 Initiation likelihood
  F.7 Protection layers
  F.8 Additional mitigation
  F.9 Independent Protection Layers (IPL)
  F.10 Intermediate event likelihood
  F.11 SIF integrity level
  F.12 Mitigated event likelihood
  F.13 Total risk
  F.14 Example