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Title: Effects Of Abnormal C O N D I T I O N S On Accuracy Of Orifice Measurement
Author: Wojciech Studzinski
Source: 1988 International School of Hydrocarbon Measurement
Year Published: 1988
Abstract: Accuracy of the orifice plate meter standard can be achieved only when the installation requirements are fulfilled. Unfortunately, not all of these requirements are precisely quantified in the orifice standard and very frequently an operator responsible for flow measurment is concerned with the impact of abnormal conditions on the accuracy of orifice measurement. From a practical point of view it is important to know the magnitude of measurement error caused by a small nick which was a few weeks at the orifice edge, deposition of solid particles on the orifice plate or temporary drop out of liquid hydrocarbons. Perfect prevention of such conditions is impossible or too expensive and therefore the presented data should help to evaluate severity of encountered measurement problems in practice. The common feature of these problems is the influence of the orifice plate geometry changes on the meter reading. In the case of orifice nicks and orifice surface roughness it is possible to define and measure characteristic geometrical parameters. Much more difficult is characterization of random liquid streaks on the orifice face and the chosen parameter such as liquid concentration has to be complemented by additional information related to the two-phase flow regime.

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