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

More documents

Recommendations

Info

8 Chapter 1 Safety Concepts This table provides simplified equations for calculating the PFDavg for the key elements in an SIS. Once the PFDavg for each element is known, an SIL can be determined. Table 1 Simplified Equations for Calculating PFDavg Description Equation Sensors To calculate PFDavg for sensors (2oo3) Block Valves To calculate PFDavg for block valves (1oo2) in series (final elements) SIF To calculate PFDavg for a safety instrumented function Note Equations are approximate To determine the SIL, compare the calculated PFDavg to the figure on page 5. In this example, the system is acceptable as an SIS for use in SIL3 applications. 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 Trident v2 Systems PFDavg = (λDU*TI) 2 + 1/2*β*λDU*TI PFDavg = 1 /3(λDU*TI) 2 + 1/2*β*λDU*TI SIF PFDavg = Sensors PFDavg + Block Valves PFDavg + Controller PFDavg Table 2 Determining the SIL Using the Equations Variables (Supplied by the Manufacturer) λ = failure rate DU=dangerous, undetected failure rate TI= test interval in hours β = common cause factor λ = failure rate DU=dangerous, undetected failure rate TI= test interval in hours β = common cause factor β λDU TI PFD Result Pressure Transmitters (2oo3) .03 2.0E-06 4380 2.1E-04 Temperature Transmitters (2oo3) .03 2.6E-06 4380 3.0E-04 Total for Sensors 5.1E-04 Block Valves (1oo2) .02 2.2E-06 4380 1.3E-04 Total for Block Valves 1.3E-04 Trident Controller 4380 1.0E-05 0.1E-04 PFDavg for SIF 6.5E-04
Safety Life Cycle Model Hazard and Risk Analysis 9 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 capability 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 capability Figure 5 Safety Life Cycle Model 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) Conceptual process design 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 SIS decommissioning (Step 9) 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 and 12: 1 Safety Concepts Overview 2 Hazard
Page 13 and 14: Protection Layers Methods that prov
Page 15 and 16: Hazard and Risk Analysis Hazard and
Page 17: Sample SIL Calculation Hazard and R
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
Page 65 and 66: When Some I/O Modules Are Safety-Cr
Page 67 and 68: Sample Safety-Shutdown Programs 57
Page 69 and 70:
Partitioned Processes Sample Safety
Page 71 and 72:
Alarm Usage Alarm Usage 61 To imple
Page 73 and 74:
A Triconex Peer-to-Peer Communicati
Page 75 and 76:
Data Transfer Time Data Transfer Ti
Page 77 and 78:
Data Transfer Time 67 A typical dat
Page 79 and 80:
Examples of Peer-to-Peer Applicatio
Page 81 and 82:
B HART Communication Overview 72 HA
Page 83 and 84:
2008-04-01 Automation, Software and
Page 85 and 86:
2008-04-01 HART Position Paper from
Page 87 and 88:
2008-04-01 A possible impact to the
Page 89 and 90:
2008-04-01 HART Position Paper from
Page 91 and 92:
C Safety-Critical Function Blocks O
Page 93 and 94:
SYS_CRITICAL_IO Accumulates the sta
Page 95 and 96:
Library Trident and Tri-GP (TRDLIB)
Page 97 and 98:
END_IF ; PREVIOUS_RESET := RESET ;
Page 99 and 100:
Output Parameters (continued) Name
Page 101 and 102:
SYS_SHUTDOWN 91 * the safety system
Page 103 and 104:
ALARM_DISABLED_POINTS := MPX.POINTS
Page 105 and 106:
Example For shutdown examples, see
Page 107 and 108:
A abbreviations, list of viii actua
Page 109 and 110:
message errors, external communicat
Page 112:
Invensys Operations Management 5601
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?