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This document summarizes and compares the mean time to failure (MTTF) and risk reduction factor (RRF) for 1oo2D and TMR (2oo3) safety instrumented systems. It develops approximate MTTF and RRF formulas for each system type using three simplifying assumptions. The key findings are: 1) The MTTF depends strongly on diagnostic coverage and weakly on common cause failure rate. 2) For 1oo2D, calculate/verify has a lower probability of failure on demand than calculate/calculate. 3) TMR performance depends ver

Author

Glaucio Soares

Language

EN