Petroleum measurement is the basis of commerce in the oil industry. One can say, "Its the cash register". Furthermore, measurement systems are used to detect operational problems or unwanted releases. Therefore, accurate petroleum measurement is paramount and understanding of the fundamental concepts of petroleum measurement is equally essential. This paper explores the fundamentals behind the measurement of liquid petroleum. The concepts of volume and mass are discussed, the physical properties of petroleum relative to temperature and pressure are explained, and the basic measurement techniques surroudnign tank gauging and metering are examined.
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