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Title: Establishment Of Hydrocarbon Flow Traceability For A Large Ball Prover By Using Flowmeters Installed In Parallel
Author: T. Shimada R. Doihara Y. Terao Y. Ito S. Shiratori
Source: Flomeko 2016
Year Published: 2016
Abstract: A large ball prover for hydrocarbon flow measurement has been c alibrated over the actual operating flow rate range by using a standard flowmeter and a positive displacement flowmete r installed in parallel. The operating flow range of the ball prover is from 100 m 3 /h to 1800 m 3 /h, and its volume is 10 m 3 . The standard flowmeter, of which maximum flow rate is 300 m 3 /h, was calibrated at NMIJ in order to be traceable to national standard. The calibrated flow rates for the ball prover were expanded from 300 m 3 /h to 1800 m 3 /h by the standard flowmeter and the PD meter installed in para llel. As a results, the calibration factors for the ball prover were obtai ned at all operating flow range. The deviation of the calibrati on factors against flow rates was l ess than 0.04 %, indicating goo d linearity of the prover. The detailed uncertainty analysis was carried out, resulting the uncertainty of the calibration f actors of the ball prover were evaluated to be less than 0.09 % . Furthermore the three flowmeters calibrated at NMIJ were mounte d in parallel and calibrated by the ball prover simultaneously in order to confirm the calibration results.

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