For Yokogawa DCS configuration, there are two flow meters for inflow and outflow of the tank; no level gauge is available. How can inventory be calculated using calculation blocks? I’m very grateful...
Thread Content
Our facility has two flow meters, one for inflow and one for outflow, of the tank type; there are no level gauges. We now want to use the flow meters (A-B) to calculate the cumulative instantaneous flow rate in order to display the inventory level. How can we use operation blocks to determine the inventory level (by accumulating positive and negative flows)? Thank you so much!
Yokogawa DCS system, CS3000, configuration implementation, calculation block (subtracting the values of two flowmeters and then accumulating the positive and negative flows)
It should be the subtraction of cumulative amounts, right?:P
How can flow rate be used to calculate liquid level? I don’t understand
Taking volume as an example: Input – Output = volume of medium; condition: Input >= Output, volume of medium = s (bottom area of tank) x h (height of tank bottom)
First, calculate the volume of the tank: base area times height. Then, subtract the outlet flow rate from the inlet flow rate; the resulting difference represents the volume of material remaining in the tank. Dividing this difference by the base area gives the liquid level. Both the inlet and outlet flow meters should measure volumetric flow rate.
Is it volumetric flow rate or mass flow rate? It’s volumetric flow rate; a minus b divided by the base area gives h, right? For mass flow rate, it’s just mass flow rate divided by density