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Title: Orifice Meter Micing Procedures
Author: Eric G. Fritz
Source: 1999 Appalachian Gas Measurement Short Course
Year Published: 1999
Abstract: The primary element Is the low tech part of gas measurement and perhaps the most overlooked. The orifice plate and the meter tube are the two parts of the primary element. They both must be installed properly and their critical dimensions must be lnown to insure accurate measurement within limited uncertainties. With the issuance of the third edition of the Standard for Natural Gas Fluids Measurement, API 14.3, the orifice plate bore diameter, dr, and the meter tube internal diameter, Dp are to be stated in terms of their dimension at a reference temperature, T. The new flow equations, which were also put in place with this standard, use the reference diameters to calculate a plate bore diameter (d) and a meter tube internal diameter (D) at flowing conditions. Any error in d or D will setup a biased error in the gas measurement done through the tube and/or plate regardless of how well calibrated or how elaborate the secondary measurement equipment is. Orifice plate micing procedures are discussed here, but the principles apply to meter tube micing as wel

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