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Abstract

This paper analyses the influence of inefficient operations performed on the ship regarding the carbon intensity indicator. In this case, different malfunctions regarding the ship's main diesel engine have been taken into consideration, such as extended fuel injection timing, wear of injector nozzles, exhaust valve leakage, and deposit of scavenging air ports. The effects of these faults on fuel usage are determined through simulations in an engine room simulator. The resulting effect values are subsequently utilized to calculate the impact on the noon report data for a bulk carrier. Finally, the effect of improper maintenance practices on the vessel's operational efficiency is determined by presenting each case's carbon intensity indicator rating results. The findings indicate that faulty operations increase fuel consumption and adversely affect the vessel's energy efficiency. Respectively, late timing, injection valve nozzle wear, exhaust valve leakage, and scavenging airport deposits negatively impact the ship operations by increasing fuel consumption approximately 8.3%, 6.9%, 2.2%, and 12.3%. Accordingly, a retreating trend is observed in some simulations for the energy efficiency level compared to real case results. The findings emphasize the importance of adequate maintenance on board by quantifying the impact of the insufficient practices. They demonstrate that companies can take influential and straightforward actions to improve ship energy efficiency without incurring any investment, provided they encourage the seafarers to perform effective maintenance practices onboard.

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