SIF PFDavg Calculation

The manual proof test interval must also be known. The example will use a one-year manual proof test interval. 

Generic failure rates were chosen from the Safety Equipment Reliability Handbook (Ref. 4) and referenced. For the PLC, a Generic S1L2 safety PLC was chosen with a single channel architecture. 

ESDI Lambda %Safe Automatic Test Diagnostic Coverage CD Repair Time (RT) Proof Test Coverage Lambda DD Lambda DU E Lambda DU U Reference 

Common Cause Beta Factor for Pressure Transmitters tcpt 0.02  

Common cause Beta fectorfor valves 0.1 95% jc14= O.OOE+00 n30 = 9.50E-02 ][46 = 5.00E-03 [lECOO] 

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