USCG Exam PracticeRefrigeration principles and systems
A reciprocating refrigeration compressor receives liquid refrigerant at its suction inlet instead of vapor. Which of the following best describes the likely consequence?
- A. The compressor will operate at reduced capacity until the liquid evaporates
- B. The high-pressure cutout will trip, shutting down the compressor safely
- ✓ Liquid slugging can break valves, connecting rods, or the crankcaseCorrect
- D. The oil-pressure safety switch will trip before mechanical damage occurs
Why C 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, constituting a serious casualty. The high-pressure cutout and oil-pressure switch address different fault conditions.
Cited:NAVEDTRA 14075 §6-2