USCG Exam PracticeRefrigeration principles and systems
Under 46 CFR §58.20-15, an anhydrous ammonia refrigeration machine may be installed in the engine room space only under what condition?
- A. The ammonia charge does not exceed 300 pounds and the space has mechanical ventilation.
- ✓ The arrangement is such as to eliminate any hazard from gas escaping to the engine room.Correct
- C. The machine is of the absorption type using aqua ammonia solution.
- D. A sprinkler system with remote control is installed within the engine room.
Why B is correct
46 CFR §58.20-15(a) states that anhydrous ammonia refrigerating machines must be in a well-ventilated, isolated compartment and may not be installed in the engine room unless the arrangement eliminates any hazard from gas escaping to the engine room. The 300-pound exemption applies to absorption machines using aqua ammonia solution and CO2 machines, not to anhydrous ammonia compressor plants.
Cited:46 CFR §58.20-15