A oil tanker may not discharge an oily mixture into the sea from a cargo tank, slop tank, or cargo pump room bilge unless which of the following conditions is present?
• MARPOL Annex I requirements for oil tankers discharging from cargo and slop tanks • The difference between discharge rules for machinery space bilges and for cargo/slop tanks on oil tankers • Meaning of Special Areas and whether rules there are more strict or less strict
• Ask yourself: For an oil tanker’s cargo/slop tanks, is discharge into the sea generally allowed or generally prohibited, and under what limited circumstances? • Which option sounds like a general allowance condition that would apply worldwide, versus something that would actually make the rules more strict? • Look at which choice matches the standard numerical discharge limit that is commonly quoted for many vessels, and consider whether that limit applies specifically to cargo/slop tanks or to a different type of oily discharge.
• Verify in MARPOL Annex I whether Special Areas have stricter or looser discharge rules than other sea areas. • Check which regulation sets the 30 liters per nautical mile limit and whether it applies to cargo tanks or to machinery space bilge discharges. • Confirm whether simply being 12 miles from land, at anchor, or stopped is EVER enough by itself to legally discharge oily mixtures from cargo or slop tanks.
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