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Title: New Primary Standard For Hydrocarbon Flowmeters At Nmij - International Comparison Between Nmij And Sp -
Author: Takashi Shimada, Ryouji Doihara, Yoshiya Terao, Masaki Takamoto, Krister Stolt, Anders Andersson,
Source: Flomeko 2003
Year Published: 2003
Abstract: A new primary standard for hydrocarbon flow measurements has been constructed at NMIJ, National Metrology Institute of Japan. The facility is designed for the calibration of hydrocarbon flowmeters in the flow rate range between 3 to 300 m3/h with an expanded uncertainty better than 0.04 % for volumetric flow rates and 0.03 % for mass flow rates (coverage factor: k2). The primary standard applies a static and gravimetric method with flying start and finish. The facility consists of two test rigs with kerosene and light oil as working fluid. The test lines for flowmeters are 50, 100 and 150 mm in diameter, and light oil and kerosene are used as the working fluids. A small volume prover and servo PD meters are used as working standards. This calibration facility has special features that enable highly accurate calibration. The uncertainty of calibration for flowmeters has been roughly estimated. As a result, the estimated uncertainty is shown to be less than the target uncertainty. The dominant sources of combined uncertainty of flow rate are uncertainties in the measurements of the mass of oil in the weighing tank and the density of oil through the flowmeter under test. To verify the performance of this oil calibration facility at NMIJ, an international comparison with SP, Swedish National Testing Research Institute , has been carried out. A screw-type positive displacement flowmeter was selected as the transfer standard and was calibrated at NMIJ and SP . The result shows that the two national standards at the two institutes agree within the quoted expanded uncertainties.

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