Primary standard for liquid hydrocarbon at low flow rates using light oil, kerosene and industrial gasoline

K.-H. Cheong, R. Doihara, N. Furuichi, T. Shimada, Y. Terao

Abstract

Motivated by the need to establish a measurement traceability in engine fuel consumption for the industry (automobile, shipping and aviation) as well as in the household fuel metering and bio-fuel production (bio-fuel blending), NMIJ developed a primary standard for low liquid hydrocarbon flow rates that works on three common types of liquid fuels, namely light oil (diesel), kerosene and industrial gasoline (flash point over 40 °C). To achieve a high calibration accuracy below 0.1 % which is needed by the industry, this primary standard adopted the gravimetric method performing static weighing with flying-start-and-finish as the calibration method. To cater to a wide flow range from 0.02 L/h to 100 L/h, the calibration facility operates on two gravimetric systems, one using a compactly designed conical rotating double-wing diverter for 1 L/h to 100 L/h and another using a pair of high-speed switching valves as a diverter for 0.02 L/h to 1 L/h. Features of each gravimetric system and its performance are highlighted in the paper. For validation of the calibration capability of the primary standard, uncertainty analysis as well as intra-comparisons with other facilities at NMIJ are also reported.

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IMEKO TC

TC9 - Flow Measurement

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