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Title: Effects Of Atmospheric Pressure On Gas Measurement
Author: Denis Rutherford
Source: 2012 International School of Hydrocarbon Measurement
Year Published: 2012
Abstract: One of the often overlooked or misunderstood parameters in upstream gas measurement is the atmospheric pressure input. To correctly configure any Electronic Flow Measurement (EFM) device to calculate a corrected volume, the static pressure at the meter run must be input to the calculations as an absolute pressure value. Since the absolute pressure is defined as the sum of the gauge pressure and the atmospheric pressure at the site, proper EFM setup requires that the atmospheric pressure be accurately determined for each metering location. This paper discusses the differences between gauge and absolute pressure sensors, methods of determining the atmospheric pressure at a location, and effects on measurement accuracy. Pressure Defined We need to first understand the concept of atmospheric pressure. Simply put, atmospheric pressure is the force exerted by the weight of the atmosphere on a given point of the earths surface. A standard atmosphere at mean sea level is generally accepted to be 101.325 kPa or 14.696 PSI or 1 ATM.

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