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The cutter stock used in most current types of marine fuel oil (MFO) are light cycle oils and clarified oils, both of which are obtained from fluid catalyst cracking (FCC) processes that are used to crack heavy oils into light oils such as gasoline. While most FCC particles are recovered and reused, some remain in the light cycle and clarified oils. As a result, MFOs that use these oils as their base material are contaminated with FCC particles. Since FCC particles are hard, they can cause abrasive wear if they enter the space between the plunger and barrel, or the space between the cylinder liner and piston ring. To prevent engine wear, vessels use an MFO treatment system to remove FCC particles. Methods for removing contaminants from MFO on vessels include use of a settling tank or centrifuge in a separator; these methods are supplemented by passing the MFO through a fine filter. The European Committee for Standardization (CEN) has established methods for evaluating separator performance. The section entitled "Separators for marine residual fuel performance testing using specific test oil" in CEN Agreement CWA15375 defines the certified flow rate (CFR) as the flow rate in l/h at which the separation efficiency of the separator is 85% using the test specific oil and test specific particles [1]. Although this provides a standardized method for expressing the capabilities of separators, which is a component of MFO treatment systems, it is also acknowledged in CWA15375 that it is assumed that we could not estimate the separation efficiency of the separator from CFR in real heavy fuel oil. On other study, effectiveness of the ferrography has been verified to confirm the separation efficiency of the separator for particles in MFO [2]. This study seeks to verify the removal rates of FCC particles in the treatment systems used on board actual vessels with the inductively coupled plasma (ICP) metal analysis and also to verify the removal rates of particles classified according to diameter including FCC particles with the particle-counter-based measurement. Evaluation of Separation Efficiency of Fuel Oil Treatment Systems for Fluid Catalyst

Evaluation of Separation Efficiency of Fuel Oil Treatment Systems for Fluid Catalyst Cracking Particles Onboard Actual Vessels