USCG Exam PracticeRefrigeration principles and systems
Under 46 CFR §58.20-15, where must anhydrous ammonia refrigerating machines be located, and what is the regulatory preference?
- A. In the engine room, provided the machinery is enclosed in a gas-tight housing
- ✓ In a well-ventilated, isolated compartment, preferably on deck, and never in the engine room unless the arrangement eliminates any hazard from escaping gasCorrect
- C. In any below-deck compartment fitted with a CO2 flooding system and remote release
- D. Adjacent to the engine room with a watertight bulkhead separating the two spaces
Why B is correct
46 CFR §58.20-15(a) requires anhydrous ammonia refrigerating machines to be in a well-ventilated, isolated compartment, preferably on deck. Installation in the engine room is prohibited unless the arrangement eliminates any hazard from escaping gas. A watertight bulkhead alone or a CO2 system does not satisfy this requirement.
Cited:46 CFR §58.20-15