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Title: Theory And Operation Of Direct Mass Flow Measurement
Author: Daniel J. Murphy
Source: 1984 Appalachian Gas Measurement Short Course
Year Published: 1984
Abstract: For many years industry has standardized on volumetric or velocity measurements for flow, primarily because these measurementsare relatively easy to obtain. However, volume changes with temperature. This is easily demonstrated by a mercury thermometer. As the temperature increases the mercury rises, no mercury is being added but the volume is increasing due to the effect of temperature. Volumetric changes can sometimes cause large discrepancies in billing versus receiving records or between inventory, receiving, and product use.

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