Uncertainty Analysis of Primary Standard for Hydrocarbon Flow at NMIJ |
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| Takashi Shimada, Ryouji Doihara, Yoshiya Terao and Masaki Takamoto |
- Abstract:
- The uncertainty of the primary standard for hydrocarbon flow measurements at NMIJ has been evaluated experimentally and analytically in detail. The primary standard is based on the static and gravimetric method with a flying start and finish at flow rates in the range between 3 and 300 m3/h. It consists of two separated test rigs with kerosene and light oil as working liquids. The expanded uncertainty is estimated to be better than 0.03 % for volumetric flow rates and 0.02 % for mass flow rates (coverage factor k = 2). The dominant sources of combined uncertainty of the flow rate are the mass of the oil accumulated in the weighing tank and the density of the oil flowing through the flowmeter being tested. A Coriolis flowmeter, a turbine meter and an ultrasonic flowmeter have been calibrated in both test rigs in order to verify the performance of the facility. The results indicate that the expanded uncertainty estimated analytically is adequate.
- Keywords:
- Hydrocarbon flow measurement, Uncertainty, Primary standard
- Download:
- IMEKO-TC9-2004-026.pdf
- DOI:
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