Safety Considerations Guide for Triconex General ... - ICEWeb

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8 Chapter 1 Safety Concepts This table provides simplified equations for calculating the PFD avg for the key elements in an SIS. Once the PFD avg for each element is known, an SIL can be determined. Table 1 Simplified Equations for Calculating PFD avg Description Equation Variables (Supplied by the Manufacturer) Sensors To calculate PFD avg for sensors (2oo3) PFD avg = ( DU *TI) 2 + 1/2** DU *TI = failure rate DU=dangerous, undetected failure rate TI= test interval in hours = common cause factor Block Valves To calculate PFD avg for block valves (1oo2) in series (final elements) PFD avg = 1 / 3 ( DU *TI) 2 + 1/2** DU *TI = failure rate DU=dangerous, undetected failure rate TI= test interval in hours = common cause factor SIF To calculate PFD avg for a safety instrumented function SIF PFD avg = Sensors PFD avg + Block Valves PFD avg + Controller PFD avg Note Equations are approximate To determine the SIL, compare the calculated PFD avg to the figure on page 5. In this example, the system is acceptable as an SIS for use in SIL2 applications. Table 2 Determining the SIL Using the Equations DU TI PFD Result Pressure Transmitters (2oo3) .03 2.0E-06 13140 1.1E-03 Temperature Transmitters (2oo3) .03 2.6E-06 13140 1.7E-03 Total for Sensors Block Valves (1oo2) .02 2.2E-06 13140 5.7E-04 2.8E-03 Total for Block Valves 0.6E-03 Tri-GP Controller 13140 1.0E-04 0.1E-03 PFD avg for SIF 3.5E-03 For additional information on SIL assignment and SIL verification, visit the Premier Consulting Services web site at www.premier-fs.com. Safety Considerations Guide for Triconex General Purpose v2 Systems
Hazard and Risk Analysis 9 Safety Life Cycle Model The necessary steps for designing an SIS from conception through decommissioning are described in the safety life cycle. Before the safety life cycle model is implemented, the following requirements should be met: • Complete a hazard and operability study • Determine the SIS requirement • Determine the target SIL EXIT No START Design conceptual process Perform process hazard analysis and risk assessment Apply non-SIS protection layers to prevent identified hazards or reduce risk SIS required Yes Define target SIL Develop safety requirements document (Step 1) Perform SIS conceptual design and verify it meets the SRS (Step 2) Perform SIS detail design (Step 3) SIS installation, commissioning, and pre-startup acceptance test (Step 4) Modify Establish operation and maintenance procedure (Step 5) Pre-start-up safety review assessment (Step 6) SIS start-up operation, maintenance, periodic functional testing (Steps 7 and 8) Modify or decommission SIS Decommission Conceptual process design SIS decommissioning (Step 9) S84.01 Concern (Step 3) Figure 5 Safety Life Cycle Model Safety Considerations Guide for Triconex General Purpose v2 Systems
Page 1 and 2: Triconex General Purpose v2 Systems
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: Preface ix • All other requests a
Page 11 and 12: 1 Safety Concepts Overview 2 Hazard
Page 13 and 14: Overview 3 Protection Layers Method
Page 15 and 16: Hazard and Risk Analysis 5 Hazard a
Page 17: Hazard and Risk Analysis 7 Sample S
Page 21 and 22: Hazard and Risk Analysis 11 • Eac
Page 23 and 24: Safety Standards 13 CAN/CSA-C22.2 N
Page 25 and 26: 2 Application Guidelines Overview 1
Page 27 and 28: General Guidelines 17 General Guide
Page 29 and 30: Guidelines for Triconex Controllers
Page 41 and 42: 3 Fault Management Overview 32 Syst
Page 43 and 44: System Diagnostics 33 System Diagno
Page 45 and 46: Operating Modes 35 Operating Modes
Page 47 and 48: Module Diagnostics 37 Analog Output
Page 49 and 50: Module Diagnostics 39 Calculation f
Page 51 and 52: Module Diagnostics 41 External Comm
Page 53 and 54: 4 Application Development Developme
Page 55 and 56: Development Guidelines 45 Array Ind
Page 57 and 58: Setting Scan Time 47 application. T
Page 59 and 60: Sample Safety-Shutdown Programs 49
Page 69 and 70:
Alarm Usage 59 Alarm Usage To imple
Page 71 and 72:
A Triconex Peer-to-Peer Communicati
Page 73 and 74:
Data Transfer Time 63 Data Transfer
Page 75 and 76:
Data Transfer Time 65 A typical dat
Page 77 and 78:
Examples of Peer-to-Peer Applicatio
Page 79 and 80:
B HART Communication Overview 70 HA
Page 81 and 82:
HART Position Paper from TÜV Rhein
Page 83 and 84:
Page 85 and 86:
Page 87 and 88:
Page 89 and 90:
C Safety-Critical Function Blocks O
Page 91 and 92:
SYS_CRITICAL_IO 81 SYS_CRITICAL_IO
Page 93 and 94:
SYS_CRITICAL_IO 83 Library Trident
Page 95 and 96:
SYS_CRITICAL_IO 85 END_IF ; PREVIOU
Page 97 and 98:
SYS_SHUTDOWN 87 Output Parameters (
Page 99 and 100:
SYS_SHUTDOWN 89 * the safety system
Page 101 and 102:
SYS_SHUTDOWN 91 ALARM_DISABLED_POIN
Page 103 and 104:
SYS_VOTE_MODE 93 Example For shutdo
Page 105 and 106:
Index A abbreviations, list of viii
Page 107 and 108:
Index 97 N NFPA 85 12 O operating m
Page 110:
Invensys Operations Management 5601
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