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Title: Orifice Fittings And Meter Tubes
Author: Ray Forbes
Source: 1976 International School of Hydrocarbon Measurement
Year Published: 1976
Abstract: The most common method of gas metering involves the measurement of a pressure difference from which, together with certain other data, the rate of flow is computed on the basis of well established physical principles. The differential pressure that is measured is produced by a restriction placed within the flowing medium. This restriction is in the form of an orifice plate which has an accurately machined sharpedged circular hole in its center. Frequent inspection of the orifice plate is necessary in some types of service to insure that it is in the proper condition to meter accurately, i.e., the plate is flat and clean and the inlet edge of the orifice bore is still sharp, square, and free from nicks or other damage.

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