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Part 4 of 6 - Analysis Phase - Safety Lifecycle Seminar - Emerson Exchange 2010
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Part 4 of 6 - Analysis Phase - Safety Lifecycle Seminar - Emerson Exchange 2010

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In San Antonio, Emerson Exchange 2010 featured a new Meet the Experts concept that provides participants to interact with recognized experts on focused topics. Emerson’s Mike Boudreaux provided a 2 …

In San Antonio, Emerson Exchange 2010 featured a new Meet the Experts concept that provides participants to interact with recognized experts on focused topics. Emerson’s Mike Boudreaux provided a 2 hour session on Safety Lifecycle Management. This was an interactive short seminar that has been designed to help business leaders and managers in the process industries have a general understanding of existing industry standards and best practices for safety instrumented systems. This seminar provides a practical overview of the safety lifecycle, including key considerations for each phase. In addition to the typical design concepts related to safety instrumented functions and safety integrity levels, important concepts such as organizational design, competency management, planning, and continuous verification will be discussed.

Part 4 describes the Analysis Phase and explains the managment considerations for hazard and risk assessment, layers of protection analysis, and safety requirements specification.

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  • 1. Analysis Phase
  • 2.
  • 3.
  • 4. Allocation of safety functions to protection layers
    Hazard and risk
    assessment
    Source: IEC 61511-3, Figure 4 – Risk and safety integrity concepts
  • 5. Source: IEC 61511-3, Figure 2
  • 6. SIS
    BPCS
    Plant and
    Emergency
    Response
    Emergency response layer
    Containment,
    Dike/Vessel
    Passive protection layer
    Mitigate
    Fire and Gas
    System
    Active protection layer
    Incident
    Emergency
    Shutdown
    System
    Safety layer
    Emergency
    shutdown
    Trip level alarm
    Prevent
    Process control layer
    Operator
    Intervention
    Operator
    intervention
    Process alarm
    Process control layer
    Process
    Value
    Normal behavior
  • 7. Likelihood
    Increasing Risk
    Consequence
  • 8. Likelihood
    Increasing Risk
    ALARP Risk Region
    Unacceptable Risk Region
    Negligible Risk Region
    Consequence
  • 9. Likelihood
    Increasing Risk
    Inherent Risk of Process
    ALARP Risk Region
    Unacceptable Risk Region
    Negligible Risk Region
    Consequence
  • 10. Likelihood
    Increasing Risk
    Inherent Risk of Process
    Non-SIS Mitigating Safeguards
    Baseline Risk
    Non-SIS Preventative Safeguards
    ALARP Risk Region
    Unacceptable Risk Region
    Negligible Risk Region
    Consequence
  • 11. Likelihood
    Increasing Risk
    Inherent Risk of Process
    Non-SIS Mitigating Safeguards
    Baseline Risk
    SIS Risk Reduction
    Overall Risk
    SIL1
    Non-SIS Preventative Safeguards
    ALARP Risk Region
    Unacceptable Risk Region
    Negligible Risk Region
    Consequence
  • 12. Likelihood
    Increasing Risk
    Inherent Risk of Process
    Non-SIS Mitigating Safeguards
    Baseline Risk
    SIS Risk Reduction
    SIL1
    Non-SIS Preventative Safeguards
    SIL2
    ALARP Risk Region
    Unacceptable Risk Region
    Overall Risk
    Negligible Risk Region
    Consequence
  • 13. Likelihood
    Increasing Risk
    Inherent Risk of Process
    Non-SIS Mitigating Safeguards
    Baseline Risk
    SIS Risk Reduction
    SIL1
    Non-SIS Preventative Safeguards
    SIL2
    ALARP Risk Region
    Unacceptable Risk Region
    SIL3
    Overall Risk
    Negligible Risk Region
    Consequence
  • 14. Likelihood
    Increasing Risk
    Inherent Risk of Process
    Non-SIS Mitigating Safeguards
    Baseline Risk
    SIS Risk Reduction
    SIL1
    Non-SIS Preventative Safeguards
    SIL2
    ALARP Risk Region
    Unacceptable Risk Region
    Overall Risk
    Negligible Risk Region
    Consequence
  • 15. As low as reasonably practicable (ALARP)
    Intolerable Risk
    10-3 / man-year (worker)
    10-4 /year (public)
    ALARP or Tolerable Risk Region
    10-5 / man-year (worker)
    10-6 /year (public)
    Negligible Risk
  • 16. Government mandates for tolerable risk levels
    10-2
    10-3
    10-4
    10-5
    10-6
    10-7
    10-8
    10-9
    Australia (NSW) -
    Hong Kong -
    Netherlands -
    United Kingdom -
    The United States does not set tolerable risk levels, or offer guidelines.
  • 17. Chemical industry benchmarks for tolerable risk
    10-2
    10-3
    10-4
    10-5
    10-6
    10-7
    10-8
    10-9
    Company I -
    Company II -
    Company III -
    Small companies -
    Large, multinational chemical companies tend to set levels consistent with international mandates
    Smaller companies tend to operate in wider ranges and implicitly, at higher levels of risk
  • 18.
  • 19.
  • 20. Quantitative Risk Assessment
  • 21. Qualitative Risk Assessment
  • 22. Qualitative risk analysis – Safety layer matrix
  • 23. Source: Exida Safety and Critical Control Systems in Process and Machine Automation July 2007
  • 24. Safety Requirement Specification
  • 25. Safety Requirement Specification
  • 26. ?