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Erosion in the LP steam turbine last stage

thread281-438732

Erosion in the LP steam turbine last stage

Erosion in the LP steam turbine last stage

(OP)
It is observed after inspection of the LP steam turbine last stage which was running only couple weeks that the Erosion occurs in the trailing edge, do you have an explanations for this phenomena ?

RE: Erosion in the LP steam turbine last stage

Poor steam conditions causing water drop-out in the final stages of the machine. Check your condenser vacuum.

RE: Erosion in the LP steam turbine last stage

agreed....
verify exhaust cooling sprays are secured as soon as not needed
also extend operation at low load

RE: Erosion in the LP steam turbine last stage

Erosion damage to the trailing edge of last stage blades may also occur at low load due to recirculation of wet steam in the last stage. In these cases, the damage usually appears near the base of the last stage blades. When recirculation occurs, the only solution may be to operate at a higher load.

Best of luck!

RE: Erosion in the LP steam turbine last stage

(OP)
the other question is related to the welding inspection does the PAUT replace the RT for welding inspection ?

RE: Erosion in the LP steam turbine last stage

(OP)
the other question is related to the welding inspection does the PAUT replace the RT for welding inspection ?

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