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Title: Cryogenic flow metering calibration: Improved Laser Doppler Velocimetry standard
Author: R. Maury C. Auclercq H. Foulon1
Source: 2018 International Symposium on Fluid Flow Measurement
Year Published: 2018
Abstract: A very promising alternative to the state-of-the-art static volume measurements for Liquefied Natural Gas (LNG) custody transfer processes is the dynamic principle of flow metering. As the Designated Institute (DI) of the LNE (being the French National Metrology Institute) for high pressure gas flow metering, Cesame-Exadebit is involved in various Research & Development programs. Within the framework of tree EURAMET Joint Research Project (JRP - 2011/2020) named Metrological support for LNG custody transfer and transport fuel applications, Cesame-Exadebit explored a novel cryogenic flow metering technology using Laser Doppler Velocimetry (LDV) as an alternative to ultrasonic and Coriolis flow metering. Cesame-Exadebit is trying to develop this technique as a primary standard for cryogenic flow meters. Currently, cryogenic flow meters are calibrated at ambient temperatures with water. Results are then extrapolated to be in the Reynolds number range of real applications. The LDV standard offers a unique capability to perform online calibration of cryogenic flow meters in real conditions (temperature, pressure, piping and real flow disturbances). This standard has been tested on an industrial process in a LNG terminal during truck refuelling. The reference can calibrate Coriolis flow meters being used daily with all the real environmental constraints and its utilisation is transparent for LNG terminal operators. The standard is traceable to Standard International units and the combined extended uncertainties have been determined and estimated to be lower than 0.6% (an on-going improvement to reducing the correlation function uncertainty which has a major impact in the uncertainty estimation).

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