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Title: Manual Chart Calculations Using 1991 Revision Of A.G.A. #3
Author: David E. Pulley
Source: 1998 International School of Hydrocarbon Measurement
Year Published: 1998
Abstract: Chart volume calculation is the process of calculating units of quantity from data taken from chart recordings and historical records. Prior to 1991 the accepted method to perform manual volume calculations was to use the latest revision of A.G.A. Report No. 3 and A.G.A. NX-19. The recommended formula was Qh C hw Pf where: Qh Quantity rate of flow at base conditions, cu ft/hr C Orifice flow constant hw Differential pressure in inches of water Pf Absolute static pressure in psi A minimum amount of calculating was required to determine factors used in the calculating the orifice flow constant (C). Most Factors could be obtained from tables which were products of average values and contributed to overall measurement uncertainty. The accepted formula was C Fb Fr Y Ffb Ftb Ftf Fgr Fpv Fa.

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