The last-stage impeller of the steam turbine is severely corroded; I’m not sure what the cause is
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The corrosion condition of the 6MW backpressure unit (design parameters: 3.43 MPa, 435°C; designed backpressure: 0.981 MPa, actual value around 0.8 MPa, temperature around 300°C) is shown in the figure:
Cavitation has occurred – what type of turbine is this?
What is the backpressure temperature, and is there any extraction steam in between? The cavitation area is large; is the back pressure deviating from the design value?
Steam quality issues, corrosion, and erosion
There is a problem with the steam quality; the exhaust pressure is low
The design temperature and actual temperature are seriously insufficient; isn’t it really water hammer?