B- Series is a single-casing, single-axis extraction condensing turbine and the inlet steam parameter ranges from 2.34Mpa/390oC to 8.89Mpa/535oC which is sorted into 6 kinds such as 3MW,6MW,12MW,15MW,25MW,50MW with total 22 types. The running speed of Back Pressure Steam Turbine is 3000r/min, which is directly connected to the generator.