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What are Catfines? How do they affect the fuel quality and engine operation?

28 Aug '19, 09:48

Aug. 28, 2019, 9:48 a.m.
KnowledgeBase's gravatar image


Catfines are Aluminium and Silicon combined. The term comes from shortening a «Catalitic fines».

The Catfines are used in the cat cracker are typically 20 to 100 microns diameter. Typical distribution of catfines in HFO 5 to 10 microns (57%), 10 to 15 microns (27%), 15 to 35 microns (15%) and greater than 35 microns (1%). Of these, particles 8 to 15 microns are considered most hazardous.

The density of Catfines is higher than one of pure fuel oil. They will settle if fuel is not contaminated with water as they are hydrophilic and emulsify on contact with water.

ISO 8217 for Marine Fuel Oil stipulates 60 ppm as the maximum content of Catfines.

Purifier will have difficulty removing particles less than 8 microns size.

Engine makers do not want more than 15 ppm of catfines in the fuel entering the engine as they may cause excessive wear to the fuel injection system and cylinder components of the engine. High levels of catfines may also clog the fine backwash filter, causing it to continuously backflush.

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28 Aug '19, 09:50

Aug. 28, 2019, 9:50 a.m.
marinexpert's gravatar image

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