Hello All
I would like to have your thoughts on this one.
I am currently designing a dosing system which consists of a storage tank, centrifugal pump and 3 dosing points. The pump draws seawater from the tank and discharges it to the dosing points as shown on the attached sketch.
As you will see from the attached sketch I would like to maintain a constant pressure in the header line and control the flow rate at each injection point by means of flow control valves. I don't foresee any problem during dosing scenario 1 as the other dosing points 2 & 3 will be isolated using the ON/OFF valves . But during the other two scenarios, the flow will be equally shared between the streams with the help of the flow control valves installed in each stream.
My question is, having three control valves in parallel cause control valve hunting issue? If so, is there a way to mitigate the problem? Alternatively, if there is a better way to design the system please let me know.
P.S. Assume that the pipe size, length, material, valves in the dosing lines are identical.
Many thanks
Allen