🔍 Key Concepts

• 33 CFR 151 – Pollution from ships (Subchapter O), especially sections on discharge of oil • The difference between routine discharges and emergency discharges to protect safety of ship or life at sea • How specific ppm limits and type/source of oily mixture affect whether a discharge is allowed

💭 Think About

• Look at which option describes an emergency or safety-related situation versus a normal operational or cargo-related discharge • Ask yourself: does Subchapter O allow any routine discharge of oil just because it is below a certain ppm, or are there stricter conditions? • Consider whether mixing oil with cargo residues or coming from pumproom bilges makes the discharge more or less acceptable under pollution rules

✅ Before You Answer

• Verify in 33 CFR 151 whether safety of ship / saving life at sea is treated differently from normal operations • Check if there is a specific numerical ppm limit in Subchapter O that, by itself, makes a discharge always permissible, or if it must also meet other conditions • Confirm whether discharges from cargo-related spaces (like tanker pumproom bilges) have additional restrictions compared with machinery-space bilges