USCG Exam PracticeRefrigeration principles and systems
A reciprocating refrigeration compressor receives liquid refrigerant at its suction inlet instead of dry vapor. Which casualty is MOST likely to result?
- A. The high-pressure cutout trips due to elevated discharge pressure
- ✓ Broken valves, connecting rods, or crankcase damage from sluggingCorrect
- C. Frost buildup on the evaporator coil blocking airflow
- D. Non-condensable gas accumulation in the condenser shell
Why B is correct
NAVEDTRA 14075 §6-2 states that liquid refrigerant returning to the suction (slugging or liquid floodback) cannot be compressed and can break valves, rods, or the crankcase — a serious casualty. The other options describe separate fault conditions not directly caused by liquid slugging.
Cited:NAVEDTRA 14075 §6-2