دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: the measure of the density or gravity of liquid petroleum products in the United States;derived from relative density in accordance with the following equation: API gravity at 60ﾰF = [141.5 + relative density 60/60ﾰF] -131.5 API gravity is expressed in degrees, 1 D. API being equivalent to 1.0, the specific gravity of water. See gravity.

n: A measure of the density of liquid petroleum products, expressed in degrees. It can be derived from the following equation: API gravity (degree) =141.5/specific gravity-131.5

the relative density of a hydrocarbon based on a scale of degrees API. Density in g/cc = (141 / (131 +API)).

n: see residuals.

a fuel oil, normally with high sulfur and high viscosity. API gravity of about 10.5o. Also called Navey Heavy and Number 6 fuel oil.

n: a light hydrocarbon liquid obtained by condensation of hydrocarbon vapours. It consists of varying proportions of butane, propane, pentane, and heavier fractions, with little or no methane or ethane.

the part of the hydrocarbon stream that is a vapor in the formation and condenses to a liquid after being cooled. Normally the volatile condensate has a composition of C5 to C8 and an API gravity of >40.

n: the mass or weight of a substance per unit volume. For instance, the density of a drilling mud may be 10 pounds per gallon, 74.8 pounds/cubic foot, or 1,198.2 kilograms/cubic metre. Specific gravity, relative density, and API gravity are other units of density.

n: Mass per unit volume expressed in pounds per gallon (ppg),grams per cubic (g/cc),or pounds per cubic ft (lb/cu.ft). Drilling-fluid density is commonly referred to as mud weight.


the mass per volume of a substance. Density of fresh water is 8.33 pounds per gallon or 1 gram/cc.

n: a double index scale against which a fixed reference pointer may be moved to correct for variations in gravity from a base point computed for water at 60�F. The compensator is marked in both specific gravity and API gravity units.

oils with API gravity between 25 and 30.

varying definition, typically an API gravity of 30o or 33o up to 40o.

n: a crude oil of relatively high API gravity (usually 40. or higher). light displacement n: on mobile offshore drilling rigs, the weight of the rig with all permanently attached equipment but without fuel, supplies, crew, ballast, drill pipe, and so forth.

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.