Tenom Pangi Hydro Power Plant (HPP) is the mosteconomical power plant for Sabah Electricity Sdn. Bhd.(SESB) and also the largest hydro station in Sabah, Malaysiawith installed capacity of 3 units of 22 MW each. Due todegrading river water quality, the previous duplex strainers orfilters with manual backwash of the plant cooling watersystem (CWS) were not practically efficient to remove theaccumulated trash load. The cause of the repeatable failurefrom the substituted auto-backwash strainers was thoroughlyinvestigated, and it was found that the failure was due to thetrapped trash and/or the sediment trapped in the autobackwashfilters which ultimately clogged the filter discharge.Several technical solutions were proposed to rectify theproblem, but the open canal with auto-strainer system was the optimum solution. The canal solution was selected base on the system reliability, cost benefit, and future water quality of Padas River. Analytical and CFD solution using commercial CFD software were used to design the system. The open canal with auto-strainer system was installed and it was found that a significant amount of sediment and trash have been separated from the river water. This dramatically improves the operational reliability of the station cooling water system while maintains sufficient water flow rate and pressures.
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