流量計を用いた大型体積管式石油用流量計校正設備の校正

抄録

A large ball prover for hydrocarbon flow measurement has been calibrated over the actual operating flow rate range by using a reference standard flowmeter and a positive displacement flowmeter installed in parallel. The operating flow range of the ball prover is from 100 m³/h to 1800 m³/h, and its volume is 10 m³. The reference standard flowmeter, of which maximum flow rate is 300 m³/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 m³/h to 1800 m³/h by the reference standard flowmeter and the PD meter installed in parallel. As a results, the calibration factors for the ball prover were obtained at all operating flow range. The deviation of the calibration factors against flow rates was less than 0.05 %, indicating good linearity of the prover. The detailed uncertainty analysis was carried out, resulting the uncertainty of the calibration factors of the ball prover were evaluated to be less than 0.09 %.