![]() To comply with the same standard, heavy crudes typically require heating before measurement. The 1980 / 1982 edition of the API-ASTM-IP Petroleum Measurement Tables for crude oils, refined products and lubricating oils (excluding light hydrocarbons, LPG’s and bitumen) are carried onboard according to the vessel’s trade. To comply with ASTM D5002, light crudes can be readily measured without heating treatment directly on a density meter measurements can be undertaken between 15 and 35 ☌, and the integrated temperature compensation according to API tables transforms the density or specific gravity to either 15 ☌ or 60 ☏. (All terms according to ISO or International Organisation for Standardisation) Standard Tables. These oils show considerable differences in their chemical and physical properties, requiring different methodological approaches for their testing. Ii) Heavy crudes, by contrast, usually have densities above 1000 kg/m 3 and API gravity of less than 20°. below 900 kg/m 3), and API gravity of 30° or more. ![]() I) Light crudes normally have a low density (e.g. This application describes the fully automatic measurement of density, SG and oAPI of light crude oil at 15 ☌ and heavy crude oil at 90 ☌ and 50 ☌.ĭepending on their origin, crude oils can differ substantially as to the chain lengths of the constituent hydrocarbons and additional components (such as sulfur) and are therefore grouped into two categories, light and heavy: Density, specific gravity (SG) and API gravity* values are used to monitor quality during the production of crude oil, and to establish its price in trading.
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