What immediate action should be taken if knocking is heard on a dual-fuel LNG ship?

Study for the USCG Third Assistant Engineer (3/AE) Test. Prepare with flashcards and multiple-choice questions, each with hints and explanations. Get ready for your exam!

The appropriate response to knocking on a dual-fuel LNG ship is to decrease the LNG to diesel ratio. Knocking, or combustion knock, can indicate abnormal combustion conditions, such as pre-ignition or detonation, which can be harmful to the engine. By reducing the amount of LNG being used and increasing the proportion of diesel fuel, the combustion characteristics can be altered to minimize knocking. Diesel has a higher ignition delay and can help stabilize the combustion process, reducing the likelihood of knock.

This adjustment allows the engine to operate smoothly and prevents potential damage from continued knocking. It is crucial to maintain engine efficiency and safety, making the correct management of fuel ratios vital in dual-fuel operations. Therefore, identifying the right response to engine knocking is critical to ensure the integrity and performance of the engine system.

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