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Title: Nbs Research On The Effects Of Pipe Roughness And Flow Conditioners On The Orifice Discharge Coefficient
Author: Charles F. Sindt, James A. Brennan, Susan E. Mcfaddin
Source: American Gas Association 1987
Year Published: 1987
Abstract: The National Bureau of Standards at Boulder, Colorado, has been investigating the effects on the orifice discharge coefficient of the location of flow conditioners and of the surface roughness of orifice meter tubes. This investigation has been conducted using a 4-inch meter. The flow conditioners investigated were a tube bundle and a Sprenkle and were located at seven pipe diameters upstream of the orifice plate. Surface roughness from 0.7 to 6.9 m (30 to 270 (in) were used in the tube upstream of the orifice plate. The impact of the flow conditioner was to decrease the orifice discharge coefficient. At surface roughness above 3.8 iim (150 pin) the effect of the surface roughness was an increase in the orifice discharge coefficient, especially at high beta ratios.

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