Part 5 of 6 - Implementation Phase - Safety Lifecycle Seminar - Emerson Exchange 2010

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  • 1. Implementation Phase
  • 2. Implementation Phase
  • 3. Implementation Phase
  • 4. Implementation Phase
  • 5. Implementation Phase
  • 6. Design and Engineering of theSafety Instrumented System
  • 7. Design and Engineering of theSafety Instrumented System
    Iterate if requirements are not met.
  • 8. Technology selection
    Sensors
    Analog vs. discrete signal
    Smart vs. conventional transmitter
    Certified vs. proven-in-use
  • 9.
  • 10.
  • 11. SIS Application?
    Certified
    Prior-Use
    Mfg proves
    It’s safe
    PFD
    PFD
    User proves
    It’s safe
    PFD
    User proves
    It’s safe
  • 12. Technology selection
    Logic solver
    Relays vs. PLC vs. Safety PLC
    HART I/O vs. conventional analog
    Centralized vs. modular
    Integrated vs. Standalone
  • 13.
  • 14.
  • 15.
  • 16. Centralized Logic Solver
    • 100’s of SIF’s in one box.
    • 17. Good for large projects.
    • 18. Single point of failure.
    Modular Logic Solver
    • Isolates SIF’s
    • 19. Scalable for large & small projects
    • 20. Eliminates single point of failure.
  • Source: ARC Advisory Group
  • 21. Technology selection
    Final element
    Solenoid vs. DVC
    Automated vs. manual diagnostics
    Response time considerations
  • 22.
  • 23. SIL 2
    PFD
    Proof Test Interval (years)
  • 24. Architecture selection
    • Hardware fault tolerance (HFT) impacts performance
    • 25. Safety integrity
    • 26. Availability
    • 27. SIL capability
  • Valve
  • 28. Valve 1
    Valve 2
    Valve
  • 29. Valve 1
    Valve 2
    Valve 1
    Valve 2
    Valve
  • 30.
  • 31.
  • 32. Proof test philosophy
    Proof test frequency
    5 yrs, 1 yr, 6 mos, 3 mos?
    Online vs. offline proof testing.
    Turnaround schedule?
    Total SIF proof test or proof test components on different intervals?
  • 33. Reliability evaluation
    Confirm that performance meets specifications
    Safety integrity (PFD)
    Availability (MTTFs)
    Response time
  • 34.
  • 35. λD= 0.02 failures/yr
    λS = 0.01 failures/yr
    T = 1 year
    1oo2
    2oo3
    1oo1
    2oo2
  • 36. PFDSIF1 = PFDPT-101 +PFDlogicsolver+ PFDFV-101
    Logic solver
    SIF #1
    PT-101
    FV-101
  • 37. Source: IEC 61511-1, Table 3 – Safety Integrity Levels: probability of failure on demand
  • 38. Detailed design & build
    Instrument design / specifications
    Wiring drawings
    Hardware design & build
    Software design & implementation
    BPCS / SIS integration
    Factory acceptance testing
  • 39. Factory Acceptance Testing (FAT)
  • 40. Installation, Commissioning and Validation
  • 41. Installation, commissioning, and Validation
    Validation is the key difference between control and safety systems.
  • 42. ?