SAFETY INTEGRITY LEVEL (SIL) ASSESSMENT

Safety Integrity Level (SIL) Assessment is a crucial process in functional safety management. Bureau Veritas offers comprehensive SIL Assessment services, including both SIL determination and SIL verification, to help organizations ensure the effectiveness of their Safety Instrumented Systems (SISs) in reducing process risks.

Our SIL Services

  • SIL Determination

    • Initial integrity evaluation of Safety Instrumented Systems (SISs) defined during HAZOP or Process Hazard Assessment
    • Focus on hazardous events with risk ratings above ALARP (As Low As Reasonably Practicable)
    • Determination of the required Risk Reduction Factor (RRF) to maintain ALARP or achieve broadly acceptable risk area
    • Determination of the Safety Integrity Level (SIL) required from SISs to maintain safe state of the Equipment Under Control (EUC)
    • Application of appropriate risk assessment methodologies (e.g., Risk Graph, Layer of Protection Analysis)
    • Development of Safety Requirement Specifications (SRS)

  • SIL Verification

    • Evaluation of SIS design against determined SIL requirements
    • Assessment of system architecture and component selection
    • Verification of SIS probability of failure on demand (PFD) calculations
    • Review of proof test procedures and intervals
    • Evaluation of common cause failures and systematic capabilities
    • Assessment of SIS lifecycle management processes

Key Features of Our SIL Assessment Approach

  • Alignment with international standards (IEC 61508, IEC 61511)
  • Integration with overall process safety management
  • Consideration of both hardware and systematic integrity
  • Utilisation of advanced quantitative and qualitative techniques
  • Involvement of multidisciplinary teams (process, instrumentation, operations)

Benefits

  • Enhanced process safety and risk reduction
  • Optimised design and performance of Safety Instrumented Systems
  • Improved allocation of resources for safety-critical systems
  • Support for regulatory compliance and safety case development
  • Increased confidence in the effectiveness of safety barriers
  • Reduced potential for process incidents and associated costs
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