Pitting on the last stage of low pressure steam turbine
Pitting on the last stage of low pressure steam turbine
(OP)
Pitting was observed on the rotary blades of last stages of low pressure turbine. What can be reasons and consequences of pitting? How can we avoid it?





RE: Pitting on the last stage of low pressure steam turbine
Consequences: turbine imbalance? reduced mechanical efficiency?
Avoidance: higher inlet steam temperature?
Basic, almost elementary questions...are you new at this? Your profile says nothing at all about you...
CR
"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
By the way, I am quite new in Turbine maintenance.
RE: Pitting on the last stage of low pressure steam turbine
Johnny Pellin
RE: Pitting on the last stage of low pressure steam turbine
I feel that pitting may be one of reason of building cracks in rotating blades of sixth stage in our 1st power plant . Still, no certain reason has been found for those blade cracks
RE: Pitting on the last stage of low pressure steam turbine
Second, "pitting" may be caused by a chemical reaction due to corrosive contaminants in the steam coming out of solution. "Pitting" due to corrosion may occur at any location along the blade and in many cases results in cracks. Eventually, these cracks may cause loss of a portion of the blade. This type of "pitting" is most likely due to poor steam chemistry.
It would be helpful to see some photos of the "pitting" to determine whether it is due to erosion or corrosion.
Best of luck!
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
Johnny Pellin
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine
RE: Pitting on the last stage of low pressure steam turbine