دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: see naphthene-base oil.

oils with API gravity between 25 and 30.

Oil with API gravity of less than 25.

n: a crude oil that is characterised by a low API gravity and a low yield of lubricating oils and that has a low pour point and a low viscosity index (compared to paraffin-base oils). It is often called asphalt-base oil, because the residue from its distillation contains asphaltic materials but little or no paraffin wax.

oil with API gravity greater than 30.

n: a crude oil characterised by a high API gravity, a high yield of low-octane gasoline, and a high yield of lubricating oil with a high pour point and a high viscosity index. Popularly, and according to an early classification system, a paraffin-base oil is a crude oil containing little or no asphalt and yielding a residue from distillation that contains paraffin wax. Compare naphthene-base oil.