Questions regarding liquid level and flow rate
Thread Content
The last edit to this post was made by Gaba Liu Cui on 2022-1-14 at 20:44. A double-flange level gauge is used to monitor the liquid level, while a mass flow meter is used to measure the outlet flow rate. The outlet valve remains unchanged; logically, as the outlet flow rate increases, the liquid level decreases； Now the liquid level is dropping and the flow rate is also decreasing – what’s the reason? I assume that a decrease in import volume leads to a lower liquid level, but the flow rate should remain unchanged; yet now the flow rate has also decreased, so the flow meter must be at full capacity.
Has there been any change in the pressure inside the container?
The outlet valve remains unchanged; how can the outlet flow be increased? In the case of gravity flow, a decrease in liquid level leads to a reduction in the pressure drop across the valve, and as a result the actual flow rate decreases. (First, it is necessary to analyze how the flow rate through the valve can be increased)
Speaking of instrument issues, let’s first clarify the manufacturing process, as it affects the instruments.
It is recommended to get a copy of the chapter on fluid transport in \"Principles of Chemical Engineering\" and take a look; it will help you understand the concept, for reference only.
It is necessary to clarify whether it is automatically controlled or manually adjusted. Has the valve moved, or remained unchanged? Have there been any changes in the process parameters? The data from the instruments are greatly affected by the process conditions as well as by the control methods used.
Instrument technician question bank, worth taking a look at