Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 70 studies the combination of various methods of designing for reliability, availability, maintainability and safety, as well as the latest techniques in probability and possibility modelling, mathematical algorithmic modelling, evolutionary algorithmic modelling, symbolic logic modelling, artificial intelligence modelling, and object-oriented computer modelling, in a logically structured approach to determining the integrity of engineering design. . | Table FMSE for process criticality using residual life Component Failure description Failure mode Failure consequences 1 2 3 4 5 Criticality rating Cost criticality rating Maintenance frequency Control valve Fails to open TLF Production 75 6 Low criticality Medium cost 6 monthly Control valve Fails to open TLF Production 75 6 Low criticality Medium cost 6 monthly Control valve Fails to seal close TLF Production 100 6 Medium criticality Medium cost 6 monthly Control valve Fails to seal close TLF Production 100 6 HIGH criticality Medium cost 6 monthly Instrument loop press. 1 Fails to provide accurate pressure indication TLF Maint. 100 2 Medium criticality Low cost 6 monthly Instrument loop press. 2 Fails to detect low pressure condition TLF Maint. 100 2 Medium criticality Low cost 6 monthly Instrument loop press. 2 Fails to detect low pressure condition TLF Maint. 100 2 Medium criticality Low cost 6 monthly Instrument loop press. 2 Fails to provide output TLF Maint. 100 2 Medium criticality Low cost 6 monthly signal for alarm 674 5 Safety and Risk in Engineering Design Theoretical Overview of Safety and Risk in Engineering Design 675 Condition likelihood of failure True False Positive True positive False positive Positive type I error predicted value P-value Negative False negative type II error Sensitivity True negative Negative predicted value Specificity determined. Using decision trees and influence diagrams details all the possible options for a decision model. Decision trees provide a more formal structure in which decisions and chance events are linked from left to right in the order they would occur. Probabilities of the likelihood of failure events are added to each node in the tree. A decision analysis generates a risk profile. The risk profile compares the sensitivity of different decision options. Such sensitivity analysis is best
