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Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 21

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Handbook of Reliability, Availability, Maintainability and Safety in Engineering Design - Part 21 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 3.16 Extract from FMECA worksheet of quantitative RAM analysis field study motor RJS pump no. 1 component Assembly Component Failure description Failure mode Failure effect Failure consequence Cause of failure Critical analysis RJS pump no. 1 Motor RJS pump no. 1 Motor fails to start or drive pump TLF Motor failure prevents quenching of the gas and the protection of the RJS structure due to reduced flow. Standby pump should start up automatically Maintenance Loose or corroded connections or motor terminals 1 100 2 0.50 3 2 4 2.0 5 1.00 Low criticality RJS pump no. 1 Motor RJS pump no. 1 Motor fails to start or drive pump TLF Motor failure prevents quenching of the gas and the protection of the RJS structure due to reduced flow. Standby pump should start up automatically Maintenance Motor winding short or insulation fails 1 100 2 0.25 3 2 4 2.0 5 0.50 Low criticality RJS pump no. 1 Motor RJS pump no. 1 Motor cannot be stopped or started locally TLF If required to respond in an emergency failure of motor this could result in injury risk Injury risk Local stop start switch fails 1 50 2 0.25 3 11 4 5.5 5 1.38 Low criticality RJS pump no. 1 Motor RJS pump no. 1 Motor overheats and trips PFC Motor failure prevents quenching of the gas and the protection of the RJS structure due to reduced flow. Standby pump should start up Maintenance Motor winding short or insulation fails 1 100 2 0.25 3 1 4 1.0 5 0.25 Low criticality automatically 3.3 Analytic Development of Reliability and Performance in Engineering Design 183 Table 3.16 continued Assembly Component Failure description Failure mode Failure effect Failure consequence Cause of failure Critical analysis RJS pump no. 1 Motor RJS pump no. 1 Motor overheats and trips PFC Motor failure prevents quenching of the gas and the protection of the RJS structure due to reduced flow. Standby pump should start up automatically Maintenance Bearings fail due to lack of or to excessive lubrication 1 100 2 0.50 3 1 4 1.0 5 0.50 Low