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Title: Electronic Chart Integrating & Related Equipment
Author: Bryan Billeaud
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: In the natural gas industry, measurement and calculation of gas volumes have long been determined through the use of orifice meter chart records. Machines which perform calculations on these records are a common sight in most companies involved with gas measurement. Electronic Equipment especially,has brought about substantial improvement to measurement and calculations due to ever increasing speed, accuracy and mathematical abilities. There are many variables used in the calculations generated from 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 represent pressure, in psi, found in an orifice meter tube and differential pressure, in inches of H2O, of opposite sides of the orifice. In accordance to the Bernoulli theorum these two curves are considered as continuous records over a specified period of time.

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