USCG Exam PracticeHydraulics and pneumatics
An engineer is draining condensate from the air receivers and intercoolers during a watch round. Which of the following BEST explains why this task is a routine watch duty rather than a periodic maintenance item?
- ✓ Condensate accumulates continuously as compression heats and wrings moisture from the air, and water carried downstream fouls controls and can defeat diesel starting.Correct
- B. Regulations require that receivers be drained before each compressor start to verify the relief valve is operational.
- C. Condensate raises the oil concentration in the receiver, increasing the risk of compressor surge.
- D. Water in the receiver reduces storage volume, requiring more frequent compressor cycling to maintain system pressure.
Why A is correct
NAVEDTRA 14075 §7-1 and NAVEDTRA 14104 §10-3 both state that draining condensate from receivers, intercoolers, and separators is a routine watch duty because water carried downstream fouls pneumatic controls and, in a starting-air system, defeats engine starting and causes corrosion. The compression process continuously produces condensate, making this an ongoing watch task. The other options describe plausible but unsupported rationales not found in the source material.