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Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 69 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 5.18 continued Component Failure description Failure mode Failure causes Defect. MATL LAB failure incl. damage Econ. failure prod. loss Total failure prod. and repair Risk Cost criticality rating Instrument loop press. 2 Fails to detect low pressure condition TLF Low pressure switch fails due to corrosion or mechanical damage 10 000 0 10 000 2.00 Low cost Instrument loop press. 2 Fails to detect low pressure condition TLF Pressure switch relay or cabling failure 10 000 0 10 000 2.00 Low cost Instrument loop press. 2 Fails to provide output signal for alarm TLF PLC alarm function or indicator fails 10 000 0 10 000 2.00 Low cost 664 5 Safety and Risk in Engineering Design Table 5.19 FMECA for process and cost criticality Component Failure description Failure mode Failure consequences Total failure prod. and repair Cost risk MTBF months Process criticality rating Cost criticality rating Maintenance frequency Control valve Fails to open TLF Production 73 850 6.00 12 Medium criticality Medium cost 12 monthly Control valve Fails to open TLF Production 32 600 6.00 6 Medium criticality Medium cost 12 monthly Control valve Fails to seal close TLF Production 43 250 6.00 6 Medium criticality Medium cost 6 monthly Control valve Fails to seal close TLF Production 43 250 6.00 4 Medium criticality Medium cost 6 monthly Instrument loop press. 1 Fails to provide accurate pressure indication TLF Maint. 500 2.00 3 Low criticality Low cost 3 monthly Instrument loop press. 2 Fails to detect low pressure condition TLF Maint. 10 000 2.00 3 Low criticality Low cost 3 monthly Instrument loop press. 2 Fails to detect low pressure condition TLF Maint. 10 000 2.00 4 Low criticality Low cost 3 monthly Instrument loop Fails to provide TLF Maint. 10 000 2.00 4 Low criticality Low cost 3 monthly press. 2 output signal for alarm 5.2 Theoretical Overview of Safety and Risk in Engineering Design 665 666 5 Safety and Risk in Engineering Design qualitative assessment values for the likelihood of
