Maintenance for Reliable Geothermal Turbine

Abstract

Since the first geothermal turbine was installed at Larderello in Italy, so many geothermal power plants have been developed. Due to corrosive gas and impurities and high wetness in geothermal steam, geothennal turbines have suffered damages such as high stress part of turbine rotor including moving blades, eroded part of turbine sealing part and last stage long blade and so on. In these a hundred years, so many technologies on material selection, steam cleaning system, low stress designs to prevent the damages have been developed. And now a day, reliability of geothermal turbine has been significantly improved and the availability has reached to the level of 90% which is very close to thermal units. However, the maintenance works are more important for geothermal turbine to maintain the reliable operation for a long time and to prevent the significant trouble in advance. In this paper, the maintenances for higher reliability of geothermal turbine are introduced, focusing on the rehabilitation of MakBan geothermal power plant in Philippine.