🔍 Key Concepts

• Crude oil washing and slop management on tankers • The role of slop tanks in separating oil and water to reduce discharges • How pollution-prevention procedures on tankers are designed to minimize oily waste to sea

💭 Think About

• Ask yourself: Does this method deal more with measurement (like ullage and expansion) or with handling oily residues and ballast? • Think about what happens to tank washings and oily ballast after a discharge: where do they go, and how might they be reused on the next voyage? • Which option mentions a process that would directly help reduce pollution from tanker operations rather than just make cargo calculations?

✅ Before You Answer

• Identify which choices relate to cargo measurement only (no pollution-prevention impact). • Identify which choice mentions slop tanks or a process similar to reusing residues. • Confirm which option clearly links the method to pollution minimization, not just routine loading or gravity ballast operations.