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Title: Electronic Chart Integrators
Author: Bryan Billeaud
Source: 1991 Gulf Coast Measurement Short Course (Now called ASGMT)
Year Published: 1991
Abstract: In the natural gas isdustry, measurment and calculation of gas volumes have been accomplished through th use of orifice meter chart records. Machines which make the calculation form these records are a common sight to most companies involved in gas measurement. Electronic equipment, improve especially,have brought about substatial improvement to measurement and calculations due to thier ever increasing speed, accuracy and mathmatical abilities. There are many variables and methods used in the volume calculations generated from these chart records. One important consideration is the pressure extension. The pressure extension is derived directly from a chart record. It is computed from two independent curves on the chart which depict the pressure, in psi, found in an orifice meter tube and the differential pressure, in inches of H2O, of the opposite sides of the orifice. In accordance to the Bernoulli theorum, these two curves dre considered as continuous records over a specified period of time.

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