After putting 2×135 MW units of Guodian Suqian Thermal Power Co Ltd into operation

the exhaust steam pressure and temperature from the high-pressure cylinder in operation of the said turbines is more far higher than the designed value. Through diagnosis and analysis before major repair and inspection during the time of major repair

the causes leading to high exhaust steam pressure and temperature from high-pressure cylinder of said turbines have been found out. Through treatment in the major repair

the exhaust steam pressure from the high-pressure cylinder has been decreased about 0.13 MPa

the exhaust steam temperature from the high-pressure cylinder being lowered about 14 ℃

substantially enhancing the efficiency of said turbines.