Deck General · MARPOL Oil (Annex I)
Under MARPOL Annex I, the maximum permitted oil content of oily bilge water discharged at sea (outside special areas) from a vessel's oily water separator is:
- A5 parts per million (ppm)
- B15 parts per million (ppm)✓ Correct
- C50 parts per million (ppm)
- D100 parts per million (ppm)
Explanation
MARPOL Annex I sets the limit at 15 ppm oil content for discharges from machinery space bilges outside special areas, provided the vessel is underway, the oily water separator is operating, and the effluent does not cause a visible sheen. Special areas have stricter or zero-discharge requirements.
Authority: MARPOL Annex I
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