Abstract: Using automatic densitometer, the density at different temperatures of different types of petroleum products were measured and converted into the standard density (20 ℃). The maximum difference method and density (20 ℃) comparison method were used to treat and analyze the data. The results showed that for hydrocracking tail oil, VGO, recycle oil, lubricating oil and atmospheric residuum, the density conversion Table D in the national standard “Petroleum Metering Table” (GB / T 1885-1998) should be selected, while the Table B should be selected for FCC slurry and heavy oil with low viscosity. By comparing the difference between the conversion density and the linear fitting standard density at different temperatures, it was found that the lower the test temperature, the more accurate the converted standard density. The correct selection of density conversion table and test temperature could improve the accuracy of density measurement of petroleum products and provide more reliable data for refining and chemical enterprises.

Key words: petroleum oils, density conversion tables, standard density