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Title: Effects Of Orifice Plates Installed Backwards And Meter Tube Roughness On Discharge Coefficients
Author: Darin L. George, Ph.D., Paul J. Lanasa, Gerald L. Morrison, Thomas B. Morrow
Source: American Gas Association 2001
Year Published: 2001
Abstract: This paper presents new results of experimental and Computational Fluid Dynamics (CFD) studies on operational effects that influence orifice meter accuracy. The effects on the orifice discharge coefficient of (1) orifice meter bore thickness, (2) backwardfacing orifice plates, (3) pressure differentials less than 25 inches of water column, (4) roughened meter tube surfaces, and (5) the use of isolating flow conditioners to counteract the effects of meter tube roughness will be discussed.

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