Fuel oil sediments from visbrraldng Arab Light. Minas or Shengli vacuum rcsids have been compared. These sediment samples were separated into pentane solubles and pentane insolubles. Arab Light and Shengli rcsids are aromatic in nature and show similar trends in sediment formation and composition. For these results, small amounts of pentane insoluble sediments (4 wt%) tend to be metal oxides, sulfides, precoke and coke, while larger amounts of pentane insoluble sediments are thermally cracked, lower H-content, polar asphaltic type materials. Waxy Minas resid, on the other hand, produces sediment that is composed of asphaltenes and waxes. Prevention of fuel oil sediment will be discussed.Downloaded by [New York University] at 15:46 11 April 2015 RANKEL AND DABKOUSKI