This answer is wrong. Plastics cannot be burned in an incinerator on board. They must be discharged to an approved shoreside facility.
Engine
General Subjects: In accordance with international MARPOL Annex V regulations and federal regulati...
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Some plastics can be incinerated. See below that is the correct answer.
§ 151.67 Operating requirements: Discharge of plastic prohibited.
No person on board any ship may discharge into the sea, or into the navigable waters of the United States, plastic or garbage mixed with plastic, including, but not limited to, synthetic ropes, synthetic fishing nets, and plastic garbage bags. All garbage containing plastics requiring disposal must be discharged ashore or incinerated.
§ 151.67 Operating requirements: Discharge of plastic prohibited.
No person on board any ship may discharge into the sea, or into the navigable waters of the United States, plastic or garbage mixed with plastic, including, but not limited to, synthetic ropes, synthetic fishing nets, and plastic garbage bags. All garbage containing plastics requiring disposal must be discharged ashore or incinerated.
plastic cannot incinerate on board.