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Title: Meter Tube Dimensional Tolerances
Author: Molly Ryel
Source: 2016 International School of Hydrocarbon Measurement
Year Published: 2016
Abstract: The orifice meter is one of the older devices that is utilized in the measurement and regulation of fluid flow. Romans regulated water flows to their homes by the use of orifice. Benoulli, Torricelli, and Venturi, discovered the original concept that the pressure of a flowing fluid varies as its velocity changes. When a flowing fluid is made to speed up by restricting the cross-sectional area of the flow stream, a portion of the pressure energy is converted into velocity energy and the pressure drops. Using this relationship with the fact that the quantity of the fluid flowing is equal to the product of the velocity times the cross-sectional area of the flow stream we can have flow measurement in the orifice meter. In order to correlate the theoretical flow with actual flow concepts there became a need for basic discharge-coefficient research to actually utilize these theories in custody transfer of products. In the early part of the last century the American Gas Association (AGA) established the Gas Measurement Committee to do just such.

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