Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com
Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com Safety Considerations Guide, Tricon v9.0 - Tuv-fs.com
8 Hazard and Risk AnalysisExample SIL CalculationAs a PES, the controller is designed to minimize its contribution to the SIL, therebyallowing greater flexibility in the SIS design.Comparison ofPercent Availabilityand PFDRiskReductIon99.9999 0.00000199.999 0.0000199.99 0.000199.00 0.0190.00 0.1PercentAvailabilityRisk MeasuresPFDTricon PES*99.90 0.001 SIL 3 SIS* Tricon controller failure rates have been independently calculated by FactoryMutual System. A copy of Factory Mutual Technical Report, “An Estimation of theFailure Rates for Modules Used in the Triconex Tricon 9 System,” FMRC J.I.003003840, is available upon request.Safety Integrated SystemSimplified Diagramof Key Elements3 PressureTransmitters (2oo3)SensorsTMR Controller(2oo3)PES/Logic Solver2 Block Valvesin Series (1oo2)Final Elements3 TemperatureTransmitters (2oo3)Tricon Safety Considerations Guide
Hazard and Risk Analysis 9Equation for Calculating PFD avg for SensorsThe following simplified equation may be used to calculate PFD avg for sensors(2oo3):PFD avg = (λ DU *TI) 2where the following variables are supplied by the manufacturer:λ = failure rateDU = dangerous, undetected failure rateTI = test interval in hoursEquation for Calculating PFD avg for Block ValvesThe following simplified equation may be used to calculate PFD avg for blockvalves (1oo2) in series (final elements):PFD avg = 1/3(λ DU *TI) 2where the following variables are supplied by the manufacturer:λ = failure rateDU = dangerous, undetected failure rateTI = test interval in hoursEquation for Calculating PFD avg for SystemThe following simplified equation may be used to calculate PFD avg for a system.System PFD avg = Sensors PFD avg + Block Valves PFD avg + Controller PFD avgChapter 1Safety Concepts
- Page 1 and 2: TriconVersion 9Safety Consideration
- Page 3: AcknowledgementTriconex acknowledge
- Page 6 and 7: viRelated DocumentsRelated Document
- Page 8 and 9: viiiHow to Contact TriconexHow to C
- Page 10: xTrainingFor Turbomachinery Systems
- Page 13 and 14: xiCONTENTSAbout This Guide ........
- Page 15 and 16: xiiiAnalog Input Module Alarms ....
- Page 17 and 18: CHAPTER 1Safety ConceptsThis chapte
- Page 19 and 20: Safety Overview 3Protection LayersT
- Page 21 and 22: Hazard and Risk Analysis 5Hazard an
- Page 23: Hazard and Risk Analysis 7Completio
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- Page 29 and 30: Hazard and Risk Analysis 13Some key
- Page 31 and 32: Safety Standards 15Safety Standards
- Page 33 and 34: Safety Standards 17Application-Spec
- Page 35 and 36: CHAPTER 2Application GuidelinesThis
- Page 37 and 38: General Guidelines 21• Under cert
- Page 39 and 40: Guidelines for Tricon Controllers 2
- Page 41 and 42: Guidelines for Tricon Controllers 2
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- Page 51 and 52: Guidelines for Tricon Controllers 3
- Page 53 and 54: CHAPTER 3Fault ManagementThis chapt
- Page 55 and 56: System Diagnostics 39System Diagnos
- Page 57 and 58: Operating Modes 41Operating ModesEa
- Page 59 and 60: Module Diagnostics 43Module Diagnos
- Page 61 and 62: Module Diagnostics 45Relay Output M
- Page 63 and 64: Module Diagnostics 47System Attribu
- Page 65 and 66: CHAPTER 4Application DevelopmentThi
- Page 67 and 68: Important TriStation Commands 51Imp
- Page 69 and 70: Setting Scan Time 53Setting Scan Ti
- Page 71 and 72: Sample Safety-Shutdown Programs 55S
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Hazard and Risk Analysis 9Equation for Calculating PFD avg for SensorsThe following simplified equation may be used to calculate PFD avg for sensors(2oo3):PFD avg = (λ DU *TI) 2where the following variables are supplied by the manufacturer:λ = failure rateDU = dangerous, undetected failure rateTI = test interval in hoursEquation for Calculating PFD avg for Block ValvesThe following simplified equation may be used to calculate PFD avg for blockvalves (1oo2) in series (final elements):PFD avg = 1/3(λ DU *TI) 2where the following variables are supplied by the manufacturer:λ = failure rateDU = dangerous, undetected failure rateTI = test interval in hoursEquation for Calculating PFD avg for SystemThe following simplified equation may be used to calculate PFD avg for a system.System PFD avg = Sensors PFD avg + Block Valves PFD avg + Controller PFD avgChapter 1<strong>Safety</strong> Concepts
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