Question Set 55

Question No. 1

What maybe the possible causes for the safety trip to trip at normal speed?


1.     Excessive vibration.

2.     Leakage in the pilot valve.

3.     Deposition of dirt in the safety trip valve.

Question No. 2

What other parts of the steam turbine blades suffer from damage?


1.     Blade roots.

2.     Shroud band.

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