Safety Considerations Guide for Trident v2 Systems - TUV ...

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2 Chapter 1 Safety Concepts Overview Modern industrial processes tend to be technically complex, involve substantial energies, and have the potential to inflict serious harm to persons or property during a mishap. The IEC 61508 standard defines safety as “freedom from unacceptable risk.” In other words, absolute safety can never be achieved; risk can only be reduced to an acceptable level. Safety methods to mitigate harm and reduce risk include: • Changing the process or mechanical design, including plant or equipment layout • Increasing the mechanical integrity of equipment • Improving the basic process control system (BPCS) • Developing additional or more detailed training procedures for operations and maintenance • Increasing the testing frequency of critical components • Using a safety-instrumented system (SIS) • Installing mitigating equipment to reduce harmful consequences; for example, explosion walls, foams, impoundments, and pressure relief systems Safety Considerations Guide for Trident v2 Systems
Protection Layers Methods that provide layers of protection should be: • Independent • Verifiable • Dependable • Designed for the specific safety risk Overview 3 This figure shows how layers of protection can be used to reduce unacceptable risk to an acceptable level. The amount of risk reduction for each layer is dependent on the specific nature of the safety risk and the impact of the layer on the risk. Economic analysis should be used to determine the appropriate combination of layers for mitigating safety risks. 0 SV Acceptable Risk Level SIS Process Lower Risk Higher Risk * BPCS–Basic process control system SIS–Safety-instrumented system SV–Safety (relief) valve BPCS* Mechanical Integrity Inherent Process Risk Figure 1 Effect of Protection Layers on Process Risk When an SIS is required, one of the following should be determined: • Level of risk reduction assigned to the SIS • Safety integrity level capability (SIL capability) of the SIS Typically, a determination is made according to the requirements of the ANSI/ISA S84.01 or IEC 61508 standards during a process hazard analysis (PHA). Safety Considerations Guide for Trident v2 Systems
Page 1 and 2: Trident v2 Systems Safety Considera
Page 3 and 4: Contents Preface vii Summary of Sec
Page 5 and 6: Contents v Partitioned Processes. .
Page 7 and 8: Preface This guide provides informa
Page 9 and 10: • All other requests are handled
Page 11: 1 Safety Concepts Overview 2 Hazard
Page 15 and 16: Hazard and Risk Analysis Hazard and
Page 17 and 18: Sample SIL Calculation Hazard and R
Page 19 and 20: Safety Life Cycle Model Hazard and
Page 21 and 22: Hazard and Risk Analysis 11 • Eac
Page 23 and 24: CAN/CSA-C22.2 No. 61010-1-04 Safety
Page 25 and 26: 2 Application Guidelines Overview 1
Page 27 and 28: General Guidelines This section des
Page 29 and 30: General Guidelines 19 Safety Measur
Page 31 and 32: Emergency Shutdown Systems The safe
Page 33 and 34: Safety-Shutdown Guidelines for Tric
Page 35 and 36: Guidelines for Triconex Controllers
Page 43 and 44: 3 Fault Management Overview 34 Syst
Page 45 and 46: System Diagnostics System Diagnosti
Page 47 and 48: Operating Modes Each input or outpu
Page 49 and 50: Analog Output (AO) Modules Module D
Page 51 and 52: Calculation for Diagnostic Fault Re
Page 53 and 54: External Communication Module Diagn
Page 55 and 56: 4 Application Development Developme
Page 57 and 58: Array Index Errors Infinite Loops D
Page 59 and 60: Setting Scan Time 49 application. T
Page 61 and 62: Sample Safety-Shutdown Programs Sam
Page 63 and 64:
Sample Safety-Shutdown Programs 53
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When Some I/O Modules Are Safety-Cr
Page 67 and 68:
Sample Safety-Shutdown Programs 57
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Partitioned Processes Sample Safety
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Alarm Usage Alarm Usage 61 To imple
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A Triconex Peer-to-Peer Communicati
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Data Transfer Time Data Transfer Ti
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Data Transfer Time 67 A typical dat
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Examples of Peer-to-Peer Applicatio
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B HART Communication Overview 72 HA
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2008-04-01 Automation, Software and
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2008-04-01 HART Position Paper from
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2008-04-01 A possible impact to the
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2008-04-01 HART Position Paper from
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C Safety-Critical Function Blocks O
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SYS_CRITICAL_IO Accumulates the sta
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Library Trident and Tri-GP (TRDLIB)
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END_IF ; PREVIOUS_RESET := RESET ;
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Output Parameters (continued) Name
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SYS_SHUTDOWN 91 * the safety system
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ALARM_DISABLED_POINTS := MPX.POINTS
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Example For shutdown examples, see
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A abbreviations, list of viii actua
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message errors, external communicat
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Invensys Operations Management 5601
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