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Title: The Orifice Expansion Correction For A 50 mm Line Size At Various Diameter Ratios
Author: Walt Seidl
Source: 1995 International Symposium on Fluid Flow Measurement
Year Published: 1995
Abstract: The expansion coefficient or factor for a compressible flowmeter corrects for the change in pressure and density as the fluid is accelerated through the flowmeter. The expansion correction currently in use in the United States and also in other countries was developed over fifty years ago by Buckingham(1) and Bean.(2) More recent work reported by Kinghorn(3) shows the equation currently in use to be in error.

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