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Title: Orifice Measurement In Perturbated Conditions : Sources Of Error And Possible Corrections
Author: Pierre Gajan, Patrick Hebrard, Bernard Platet
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: In order to improve the flowrate measurements obtained by means of orifice plates when they are used in pipes where the flow characteristics deviate from the fully developped conditions required by standards, two kind of approaches are possible. The first one is to recreate these required conditions by means of especially designed devices in the second one, the perturbation effects are taken into account in the flow rate computation. In this paper, result of the cooperation between a research center and two industrial partners,an example of each approach is presented. For spatial disturbances, a resulting flow quite independant of upstream conditions is given by a new type of flow conditioner, the geometry of which is determined by a simple computation. For pulsating flow, new unsteady analytical models(in which coefficients, generally empirical, are here determined from instantaneous measurements) are presented and tested to show their ability in improving the metering error corrections.

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