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Title: The Beneficial Impact Of Controlled Very Rough Metering Tube
Author: Blaine Sawchuk, Danny Sawchuk, Reginald Selirio
Source: 2012 International Symposium on Fluid Flow Measurement
Year Published: 2012
Abstract: The impact of very high pipe roughness values on the long term accuracy of an ultrasonic flow meter is investigated. It appears that we are presently running ultrasonic flow meters in the wrong pipe roughness location on the Moody diagram. Instead, the meter tube should be extremely rough, or it should be shortened with the flow conditioner assuming the role of a very rough pipe, which is fluid dynamically equivalent. This paper revisits basics by using the well-established and accepted (but probably incorrect) pipe flow concepts presented by Moody et al circa ASME 1944, and merges them with the latest understandings of ultrasonic flow meter design and operation experts

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