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

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

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