Are there any solutions for process control in the pharmaceutical industry? For example, control of transferring materials (solvents) from storage tanks to the reaction vessels in workshops? Not only one-on-one...
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Are there any solutions for process control in the pharmaceutical industry? For example, control of transferring materials (solvents) from storage tanks to the reaction vessels in workshops? Consider not only one-to-one but also one-to-many. The workshop is started by turning on the pumps in the tank area, opening the workshop valves, and measuring the accumulation. After finishing, close the valve and shut down the pump
I’m not quite sure what exactly you’re trying to ask. I assume the control method you have in mind is feasible: 1. For intermittent feeding, one pump, one flow meter, one control valve, along with a on/off valve, can be used to ensure that a supply tank delivers fluid to the desired location at different times. 2. For continuous feeding, it’s also possible to use one tank and one pump to supply different locations; however, each supply point requires a control valve and a flow meter, and the pump also needs to have a backflow control mechanism；
Due to the continuous feed from one to multiple points, pressure buildup may occur when feeding stops at one of those points； Running a centrifugal pump for a short period of time may not pose many problems, but running it for an extended time is not advisable. Therefore, it is necessary to adjust the pipeline pressure by regulating the backflow volume; the following control methods can be used to achieve this: 1. Use variable frequency drive for the pump, and install pressure sensors at the pump outlet to control the pump’s operation based on the pressure levels ； (Large investment, but energy-saving) ； 2. Install a control valve on the return pipeline, and add pressure monitoring at the pump outlet. Control the valve opening through pressure ； 3. Self-acting pressure control valve installed on the return pipeline ； (Least expensive)
Is it this kind of reflux control method shown in the diagram? Could you please explain the specific controls? Please describe it.
Is it this kind of reflux control method shown in the diagram? Could you please explain the specific controls? Please describe it.
I’ve attached the image below; please take a look
It’s simple: create four sequences. 1. Open the switch valve in the workshop to start the pump； 2. Cumulative start of flow rate for valves in the corresponding workshop ； 3. The valves in each workshop are interlocked; if one valve is opened, the others cannot be opened ； 4. When the set flow rate is reached, stop the pump and close the valve.
That’s roughly it, but if traffic control is to be implemented in each area, flow meters and control valves will need to be added to each area
After the valves in one or more workshops are closed and the pumps in the tank area are shut down, the short duration of valve closure means that the pumps do not stop immediately due to inertia; as a result, there is significant vibration at the pump outlet, especially when there are expansion joints at that outlet. Is there a good solution for this?
Add a delay module to the program; once the flow rate reaches the set value, stop the pump and wait for 2 to 5 seconds before closing the valve.