G0510106 Investigation into flow dependency of Small Volume Prover for hydrocarbon flowmeters

Abstract

Several kinds of commercial and mechanical flowmeters, namely, turbine meters and positive displacement flowmeters, have been calibrated using the primary standard for hydrocarbon flow measurement in Japan, which is based on static and gravimetric methods with a flying start and finish, and a small volume prover (SVP) at the same calibration condition in order to investigate the performance of the SVP. The calibration results for the mechanical flowmeters between the primary standard and the SVP show agreement within 0.05%. However, the relative differences of the K factors using the SVP from those using the primary standard are dependent on the flow rates, indicating that the SVP should be calibrated in the all flow rate range instead of a constant displacement of volume in order to achieve a lower uncertainty.