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7657
Experimental Study of the Metal Foam Flow Conditioner for Orifice Plate Flowmeters
Abstract:
The sensitivity of orifice plate metering to disturbed flow (either asymmetric or swirling) is a subject of great concern to flow meter users and manufacturers. The distortions caused by pipe fittings and pipe installations upstream of the orifice plate are major sources of this type of non-standard flows. These distortions can alter the accuracy of metering to an unacceptable degree. In this work, a multi-scale object known as metal foam has been used to generate a predetermined turbulent flow upstream of the orifice plate. The experimental results showed that the combination of an orifice plate and metal foam flow conditioner is broadly insensitive to upstream disturbances. This metal foam demonstrated a good performance in terms of removing swirl and producing a repeatable flow profile within a short distance downstream of the device. The results of using a combination of a metal foam flow conditioner and orifice plate for non-standard flow conditions including swirling flow and asymmetric flow show this package can preserve the accuracy of metering up to the level required in the standards.
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References:

[1] British Standard 1042-1.4, Measurement of fluid flow in closed conduits, Part 1: Pressure differential devices. 1992
[2] E. Kelner and T.B. Morrow, "Compact orifice meter station project," 4th International Symposium on Fluid Flow Measurement, Denver, Colorado USA, 1999
[3] E. Kelner, T.B. Morrow and E. Bowles, "Minimizing Orifice Meter Installation Lengths," Pipeline & Gas Journal
[4] R.W. Miller, "Flow Measurement Engineering Handbook," London: McGraw-Hill, 1989
[5] "Flow conditioners performance review," National Engineering Laboratory, 1998
[6] B. Manshoor, F. C. G. A. Nicolleau, and S. B. M. Beck, "The fractal flow conditioner for orifice plate flow meters," Flow Measurement and Instrumentation, 2011. 22(3): p. 208-214. 2011
[7] ISO 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full, Part 2: orifice plates. 2003.
[8] S.B.M. Beck and J. Mazille, "A study of a pressure differential flow meter that is insensitive to inlet conditions," Flow Measurement and Instrumentation 12 379-84, 2001
[9] Reader-Harris, S.P. Hutton and E.M. Laws, "Flow straighteners and flow conditioning devices," Flow measurement and instrumentation consortium, 1989

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