USCG Exam PracticeWatch duties, terminology, and instrumentation
On a vessel with a boiler plant, water is observed being carried over with the steam into the superheater and turbine. Which condition in the boiler drum is the direct cause of this casualty?
- A. Water level that is too low, exposing the heated tubes
- ✓ Water level that is too high, causing priming and carryoverCorrect
- C. A stuck feedwater regulator holding the feed valve fully closed
- D. A clogged gauge glass drain giving a falsely low water level indication
Why B is correct
NAVEDTRA 14104 §4-2 explains that too high a water level causes water to be carried over with the steam (priming and carryover), slugging the superheater and turbine with water and causing water hammer and mechanical damage. Too low a level is a separate, distinct casualty involving tube overheating.
Cited:NAVEDTRA 14104 §4-2