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Title: Effects Of Mechanical Tolerances On Orifice Meters
Author: Raymond G. Teyssandier, Zaki Husain
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Effects of a number of different mechanical tolerances on the discharge coefficient of an orifice meter were experimentally investigated. Different tolerances investigated were (a) axial location of the upstream and downstream tap in relation to the upstream face of the plate, (b) radial eccentricity of the plate in relation to the azimuthal locations of the flange, pipe and radius taps, (c) plate thickness and bevel angle, and (d) gaps introduced by the ring-type joints. This investigation was limited to determine the effectiveness of the tolerances of the currently accepted standards and provide additional supporting data to the existing database. The results of this study show that the eccentricity tolerance in ISO-5167 is about an order of magnitude tighter than is necessary, while all other parameters are specified with various degrees of adequacy.

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