Failure Mode Effect Analysis

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Failure modes, effects and criticality analysis (FMECA) and failure mode effect analysis (FMEA) are among the widely used reliability analysis tools. They facilitate identification of potential design reliability problems, and can assist in removing causes of failures. Also, they aid the development of systems that can mitigate the effects of failures. This paper investigates the failure criticality and risk of electrical components of water pumping system of Asa dam mega-water station in Kwara state, North Central Nigeria, with a focus on component failures of all electrical components, their failure modes, causes and remedies. It also recommended specific maintenance routine. It observed that starters, control switches and circuit breakers…show more content…
Component failure is due to broken pipes, pump failure, motor failure and power outages, etc. Whereas the performance failure includes failures associated with distribution flow and pressure, quality of water, etc. [52]–[54]. The failure rate of each component was predicted by Military Handbook-217F, and is used to calculate the criticality of each failure mode, total criticality of the component on the system and comparison of each criticality value. The remainder of the paper is organized as follows; section 2.1 and 2.2 describe the procedure for FMECA and analysis of FMECA respectively. Meanwhile, section 3.1 shows the results; the discussion is presented in section 3.2 and section 4.0 present conclusions reached. 2.1 Procedure for Hardware Approach Identify all potential component failure modes and define their effects on the immediate function or item, the system, and on the mission to be performed Evaluate each failure mode in terms of the worst potential consequence, which may be ranked according to their severity Identify failure detection methods and compensating provision for each failure mode Identify corrective design or other actions required to eliminate the failure or to control the…show more content…
A bottoms-up approach is used whereby analysis begins at the component level, followed by analysis of subsequent or higher system levels. Failure mode ratio: Failure mode ratio α, is the proportion of failure of the N components in question that turn out to be that particular failure mode. That is, (1) Failure mode rate: Failure rateλ_P, is the part failure or hazard rate; that is, the probability that the component will fail during a specified time interval t, where t is the operating or at-risk time. For a mode, the failure rate λ_m is according to equation (2)[1]: (2) Failure mode criticality: Failure mode criticality C_m, of a component is given as shown in equation (3)[1]. (3) Where β is an engineering judgement factor, and it is conditional probability of loss of function or

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