USCG Exam PracticeRefrigeration and air conditioning
Liquid refrigerant returning to the compressor suction is called slugging or liquid floodback. What is the primary hazard of this condition?
- A. It causes the suction pressure to rise, tripping the high-pressure cutout
- B. It dilutes the crankcase oil, reducing lubrication to the bearings only
- ✓ Liquid cannot be compressed and can break valves, connecting rods, or the crankcaseCorrect
- D. It causes the refrigerant charge to migrate to the receiver
Why C is correct
NAVEDTRA 14075 §6-2 states that liquid refrigerant cannot be compressed and can break valves, rods, or the crankcase, describing it as a serious casualty. The system is arranged to ensure refrigerant is fully evaporated and slightly superheated before reaching the compressor suction to prevent this.
Cited:NAVEDTRA 14075 §6-2