USCG Exam PracticeBoiler and steam propulsion fundamentals
A sudden rise in chloride concentration in boiler water samples is most likely an indication of which condition?
- A. Excessive alkalinity caused by overdosing of chemical treatment
- ✓ Seawater contamination, such as from a condenser tube leakCorrect
- C. Scale formation from calcium and magnesium hardness salts
- D. Dissolved oxygen entering the system through the deaerating feed tank
Why B is correct
A sudden rise in chlorides in boiler water is a warning of seawater contamination, for example from a condenser tube leak. This must be found and corrected promptly to prevent scale and corrosion. Alkalinity, hardness scale, and dissolved oxygen are separate water chemistry concerns with different indicators. (NAVEDTRA 14104 §4-5)
Cited:NAVEDTRA 14104 §4-5