Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 34 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. . | Theoretical Overview of Availability and Maintainability in Engineering Design 313 The dependency on system A2 is D _ 500 - 900 - 1 000 x p _ 1 000 _ 60 . The dependency on system A3 is D _400 - 900 - rot p _ 1 000 _ 50 . What is the economic loss of production in the event of systems A1 and A2 being down for 5 days as a result of downtime Relative lost time cost _ 5 days x 20 000 day x 10 for system A1 _ 10 000 Relative lost time cost _ 5 days x 20 000 day x 60 for system A2 _ 60 000 Relative lost time cost for systems A1 and A2 _ 70 000 A point of interest is that the dependencies and relative lost time costs are calculated from the viewpoint thatfirst system A1 goes down then secondly system A2. Would there be a difference in the calculations if system A2 went down first followed by system A1 Thus what is the economic loss of production in the event of system A2 being down for 5 days and then systems A2 and A1 being down for 5 days In the three-system parallel configuration process The dependency on system A2 is 500 - 1 500 - 1 000 Dep. A2 -------- 000 --- x 100 _ 0 . The cost of dependency is the relative lost time cost due to functional failure of the equipment at its relative value of dependency. Relative lost time cost _ 5 days x 20 000 day x 0 for system A2 _ 0 . If system A2 experiences downtime first what is the dependency on system A1 in the two-system parallel configuration process 314 4 Availability and Maintainability in Engineering Design The dependency on system A1 is D 600 - 900 - 1 QOQ p 1 000 70 . What is the economic loss of production in the event of systems A2 and A1 being down for 5 days as a result of downtime Relative lost time cost 5 days x 20 000 day x 0 for system A2 0 Relative lost time cost 5 days x 20 000 day x 70 for system A1 70 000 Relative lost time cost for systems A2 and A1 70 000 Thus the relative lost time cost for systems A1 and A2 remains the same irrespective of which system goes down first. b Life-Cycle Analysis and .
