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Title: Flare Measurement Using Advanced Ultrasonic Technology
Author: John Daly
Source: 2014 International School of Hydrocarbon Measurement
Year Published: 2014
Abstract: ltrasonic transit time technology has been established as the preferred method for Flare Gas flow measurement with thousands of units installed worldwide in process plants and refineries, both on and offshore. With new regulatory requirements around total emissions either im plemented or expected around the world, there is a requirement for more precise flare flow measurement report ing. This presents particular technical challenges for ultrasonic flowmeters when (1) there are extremely low fl are flow rates (0.3 m/s and below) during normal, or base load flaring and (2) upstream and downstream straight pipe lengths to manufacturers recommendations are either not possible or extremely costly to pr ocure. Low flare flow measurement is influenced by asymmetric convection flow and stratification. Limited upstream and downstream straight pipe lengths cause flow profile asymmetry and create inaccuracy of measurement

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