Reliability Study of Underwater Drainage Pump System

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  • 雑排水ポンプシステムの累積ハザード法による信頼性解析と保全方法の評価
  • ザツ ハイスイ ポンプ システム ノ ルイセキ ハザードホウ ニ ヨル シンライセイ カイセキ ト ホゼン ホウホウ ノ ヒョウカ

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A reliability analysis was carried out on an underwater drainage pump system. The Cumulative Hazard Analysis (C.H.A.) was employed to estimate both the shape and scale parameters of Weibull Distribution for the system's components, and nine years of actual failure and maintenance data were taken from the operation record of a building complex. As a result, the analysis for the underwater drainage pump system shows that the C.H.A. is effective in numerically analyzing failure phenomena and the prevailing maintenance maintains system reliability over 0.7 The underwater drainage pump system consists of series and parallel subsystems. The series subsystem has a relay, an ampere meter, electrode rods and a main pipe. The parallel subsystem has a pair of pump, cable, pipe and gauge. Fig. 1 shows the schematic of the system. Table 1 shows the shape and scale parameters of the Weibull distribution of some components, which had relatively many failures. The shape parameters of the electrode rods and the pipe are less than one, which shows that poor design/construction caused these failures. Since in fact there are several design mistakes, C.H.A. is a useful data analysis method. The subsystem failure rates of other components except three components explained above were estimated applying the theory of Drenick, which assumes an exponential distribution for a combination of component. The system reliability illustrated in Fig. 2 was calculated using the estimated parameters and the consideration of system functional structure (series-parallel subsystem) with and without maintenance. It shows that the prevailing maintenance maintains system reliability over 0.7. It is important to increase the number of fundamental reliability data. Computer-aided Facility Management System (CAFM) and Building Energy and Environment System (BEMS) and will be necessary in the future.

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