SL2017-638/DOJA Cleaning of Heavy Fuel Oil and Maximum 0.10%

The latest ISO marine fuel standard specifies levels of up to maximum 60 ppm Al + Si in the fuel (ISO 8217). Such a level would cause high wear compromising reliability in the combustion chamber, and so the fuel
must be cleaned on board the ship before it reaches the engine.

This Service Letter specifies the recommended maximum acceptable level of cat fines entering the engine, which is as follows:
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Always keep the level as low as possible and, max. at 15 ppm
Al + Si at engine inlet for short periods.