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Title: Orifice Meters For Liquid Measurement
Author: Wayne T. Lake
Source: 1998 International School of Hydrocarbon Measurement
Year Published: 1998
Abstract: The concentric, square edge orifice meter has historically always been used for large gas measurement custody transfer applications due to its simplicity of design and operation. Although the entire original Ohio State orifice discharge coefficient data set and subsequently derived equation was based solely on water tests, the orifice meter is not usually considered for liquid measurement. Turbine or displacement meters are normally used for liquid hydrocarbon custody transfer and the primary reason for the use of these meters over the orifice is two fold the turbine and displacement are inherently volume meters (the same quantity basis as the contracts) and they can be conveniently proved in the field providing the buyer/seller of product with a high degree of confidence of very accurate measurement. However, orifice meters may be appropriately applied in a wide variety of liquid measurement applications whereby the orifice meter may in fact be the best solution or fit for purpose primary device in many cases. The intent of this paper is to provide the reader with sufficient background information and resources for making well infonned decisions in selecting orifice meters for liquids, with an emphasis on heavy, viscous hydrocarbon applications such as crude oil.

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