Before delivery, ship-building company has to carry out performance test of main engine exactly in maker's shop and sea trial and then summit standard data so that operators can compare performance of main engine after delivery.
Shipping company and operators have to manage well to keep shipping schedules without problems in main engine. Specially operators have to operate main engine within the limit of operation point, and adjust the related parameters to be operated safely and continuously. Also operators have ability to analyze fouling condition of hull through comparing data gotten from P-V curve and performance results of new building ships in trial with service ships.
In this study, not only compared main engine performance results in shop trial and sea trial, but also investigated performance trend in accordance with the time elapsed for the service ship's diesel engine.
They were confirmed as follows. First, shop trial load is higher than sea trial load but ship's speed is satisfied with owner's contract speed. Because the rating of main engine is considered with sea margin and propeller margin. Second as time goes by, the load of service ship increases steadily and other parameters related with main engine shows variable changes depend on the load increment of main engine.