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This is the official publication by the International Maritime Organization dedicated to the Crude Oil Washing systems (COW). The MARPOL Convention Regulation 13 required certain types of ships to operate with a cargo tank cleaning system using COW. Such installation, its associated equipment and arrangements must all meet the Flag Administration requirements based on the Specifications for the design, control and operation of the COW systems adopted by the IMO Conference. This publication contains the revised Specifications (IMO Resolution A.446 (XI), as amended by A.497(XII) & A.897(21), standard format for the COW OEM (Operations and Equipment Manuals) in accordance with Resolution MEPC.3(XII), as amended by Resolution MEPC.81(43), guidelines for in-port inspections of COW procedures, and some examples of COW OE Manuals for reference.