Because LSFO from multiple sources is likely to be 

stored in the same tank, cleanness, compatibility, and 

styrene and phenol requirements are added to prevent 

flocculation when a compliant oil product becomes mixed 

with a different type of light oil or heavy fuel oil and to 

exclude non-petroleum-based oil products.

Cleanness measures the number of suspended particles 

in LSFO and indicates the product’s stability. Compatibility 

measures how compatible different oil products are 

with each other and indicates their tendency to form 

suspended particles when mixed. Together, cleanness 

and compatibility help identify risks such as overload 

of fuel supply system’s centrifuges, clogging of filters, 

and formation of oil sludge. To determine whether nonpetroleum-based hydrocarbons, chemical wastes, and 

other harmful components in blending materials are 

added in LSFO, phenol and styrene, two characteristic 

components, are also measured. For these reasons, 

LSFO deliverable at INE is additionally tested for 

cleanness, compatibility, and phenol and styrene contents.

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