🔍 Key Concepts

• 46 CFR definition of oil fuel unit in the context of machinery spaces and oil‑fired boilers • The difference between heat/energy quantities and equipment or systems on a vessel • How fuel oil is handled, prepared, and delivered to an oil‑fired boiler or diesel engine

💭 Think About

• Ask yourself: In 46 CFR, when the Coast Guard defines something like an oil fuel unit, is it usually describing a physical piece of equipment or an amount of heat/energy? • Which option sounds like it would actually be installed in an engine room or boiler room and subject to construction and safety requirements? • Look at which choices talk about measurable heat units versus equipment that processes or delivers fuel. Which fits better with Coast Guard engineering regulations?

✅ Before You Answer

• Verify whether 46 CFR engineering definitions for fuel systems focus on equipment layout and safety rather than heat calculations • Check if the definition would logically be used in rules about fuel piping, location, shielding, and fire safety near boilers • Eliminate any choice that only talks about thermal units or laboratory test values without referring to actual shipboard machinery or systems