122. Turbine Abrasion at the Jhimruk Hydropower Project in Nepal

Sediment induced abrasion in water turbines due to silt is a major problem in Nepal. The various component of hydraulic turbines operating in silt-laden water suffer from extensive abrasion damage. Many run-if-the-river schemes in the Himalayan region are affected by this problem, frequently forcing them to shut done for repair work. This has a negative effect on availability and efficiency of the plants. Besides large revenue losses, there are often high maintenance costs involved, since spare parts are not readily available. Having an operating strategy incorporating real time sediment monitoring is seen as one of the tools to combat turbine wear. Various types of protective coatings have been tested by different manufacturers but there is still much to be done to find an effective solution to this problem. This paper discusses the approaches taken by Butwal Power Company (BPC), owners of the 12 MW Jhimruk Hydropower Project in Nepal, in trying to reduce sediment induced problems.