The accuracy issue of the flow meter in the loading system
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I would like to ask everyone: in a loading system where the density of the medium remains relatively stable, what level of accuracy is required for a volumetric flow meter?
A precision of ±1FS (±0.5 is optional) will meet the requirements; I think it probably won’t be used for settlement purposes, and in that case it’s better to opt for a gravimetric scale.
For settlement, it’s still better to use a mass flow meter. . . . .
The loading requirement is generally around two per thousand, I think
For foreign trade settlements, the accuracy requirement is ±0.2.
Imported mass flow meters with an accuracy of 0.1%–0.15% should be used in loading systems for trade settlement. Manufacturers such as Rosemount, ABB, and E+H all produce them.
We use mass flow meters, but the error is quite large; it is mainly affected by temperature, as the specific gravity of the medium fluctuates.
What was said upstairs is incorrect; a mass flow meter has nothing to do with temperature, so how could it be affected by air temperature? In loading systems, gauges with an accuracy of one in a thousand are generally used, resulting in a total system error of less than 0.2%. However, when using mass flow meters for loading, it is essential to keep the liquid level in the tank from dropping too low; otherwise, two-phase flow will occur, leading to inaccurate loading results. I think using a flow meter for loading has disadvantages, and two-phase flow should be minimized as much as possible.