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How to calculate ullage in a tank11/30/2022 ![]() ![]() The automatic sampler generally consists of a probe, sample extractor, flow meter, controller, and sample receiver.īarrel (BBL) - A unit of volume equal to 42 U.S. = 141.5 - 131.5Īutomatic Sampler - A device used to extract a representative sample from the liquid flowing in a pipe. The relation between API gravity and relative density (formerly called specific gravity) is: API Gravity at 60 Deg. ![]() API gravity is measured by a hydrometer instrument having a scale graduated in degrees API. For the full set of definitions, Chapter I of the API Manual of Petroleum Measurement Standards (MPMS) should be reviewed.Īccuracy - The ability of a measuring instrument to indicate values closely approximating the true value of the quantity measured.Īmbient Temperature - The temperature of the surrounding medium such as the atmosphere.ĪPI - The American Petroleum Institute, founded in 1919, was the first oil trade association to include all branches of the petroleum industry.ĪPI Gravity (Relative Density) - A means used by the petroleum industry to express the density of petroleum liquids. The following is a compilation of most of the standard measurement terms and definitions used ashore and on oil tankers today. One of the biggest necessities in being able to effectively account for large volumes of oil within the industry is a uniform set of terms and definitions for oil measurement. ![]() Calculating ship/shore and shore/shore cargo differences is also very important. The accurate determination of cargo quantities on board a vessel is extremely important for safety, commercial and legal reasons. Until relatively recently, different terms for oil volumes were used on ship and ashore leading to confusion and built-in accounting discrepancies. MEASUREMENT TERMS AND DEFINITIONS _Ī B C D E F G H I J K L M N O P Q R S T U V W X Y Z ![]()
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