When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to __________.
Official USCG Answer & Rule Citation
Correct Answer: Option A — seal the casing during periods of low casing pressure
In USCG Steam Plants (Boilers & Turbines), regarding 'When turbine rotor shafts extend through the casing, an external source of sealing steam is used in conjunction with labyrinth packing to', the verified engineering fact is: 'seal the casing during periods of low casing pressure'.
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