🔍 Key Concepts

• Purpose of a lube oil sump in a main propulsion engine and how it affects lubrication reliability • How oil circulation and return from bearings/engine spaces back to the sump should work (rapid vs delayed return) • Practical sump shape and piping design to avoid sludge pockets, air entrainment, or pump starvation

💭 Think About

• Think about what design feature would best prevent the lube oil pump from sucking air if the vessel pitches, rolls, or the oil level drops slightly. • Which option would help keep oil cool, clean, and quickly available to the pump suction rather than trapped or delayed in the system? • Consider what an absolutely flat or sharply cornered sump bottom might cause in terms of sludge accumulation and incomplete drainage.

✅ Before You Answer

• Which option most clearly supports continuous, reliable oil supply to the pump suction under all sea conditions? • Eliminate any choice that would trap oil or sludge rather than let it drain freely toward the suction. • Ask whether the option would help maintain proper oil circulation and quick return from engine spaces back to the sump.