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API

The American Petroleum Institute abbreviation.

Related Terms

HYDROMETER

An instrument for determining either the specific gravity of a liquid or the API gravity.

API ENGINE SERVICE CATEGORY

Gasoline and diesel engine oil quality levels established jointly by API, SAE, and ASTM, and sometimes called SAE or API/SAE categories; formerly called API Engine Service Classifications.

LIGHT CRUDE OIL

A crude oil of relatively high API gravity (usually 40°C degrees or higher).

A.P.I.

American Petroleum Institute

BURNING-QUALITY INDEX

Prediction of burning performance of furnace and heater oils; derived from ASTM (American Society for Testing and Materials) distillation, API (American Petroleum Institute) gravity, paraffinicity, and volatility.

CETANE INDEX

An empirical method for finding the cetane number of a fuel based on API gravity and the mid boiling point.

POLISHING

1. In petroleum refining, removal of final traces of impurities, as for a lubricant, by clay adsorption or mild hydrogen treating. Smoothing and brightening a surface such as a metal or a rock through the use of abrasive materials.

PETROLEUM PROCESSING

The recovery and processing of various usable fractions from the complex crude oils; usable fractions include gasoline, kerosine, diesel oil, fuel oil, and asphalt. Also known as petroleum refining.

PARAFFIN PRESS

A filter press used during petroleum refining for the separation of paraffin oil and crystallizable paraffin wax from distillates.

MOVING-BED CATALYTIC CRACKING

[CHEMENG] Petroleum refining process for cracking (breaking) of long hydrocarbon molecules by use of heat, pressure, and a granular cracking catalyst that is continuously cycled between the reactor vessel and the catalyst regenerator.

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