A tanker is tank-cleaning while on a ballast passage through an Annex I special area. What are the requirements concerning disposal of oil residues and oil and water used for tank washing?

Any discharge into the sea (other than an exceptional discharge) of oil or oily mixture from the cargo area is prohibited in a special area. (MARPOL Annex I, reg. 34. 3) The oil residues which cannot be discharged into the sea in compliance with regulation 34.1 or 34.3 must be retained on board for subsequent discharge to reception facilities. (MARPOL Annex I, reg. 34. 9)

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Under what conditions may a ship of 400 GT or more discharge machinery space bilge water outside special areas?

What are the oil discharge requirements for ships of less than 400 GT in any special area other than the Antarctic Area?