The outlets of two different centrifugal pumps are connected together
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Two different centrifugal pumps, with inlets from different sources and varying outlet pressures, have now been connected together. Can the flow rates required for each pump be adjusted by using the outlet valves as limits? (For example, one unit requires 1500 L/H of flow rate, while another requires 400 L/H) Is this possible?
Draw a schematic diagram and calculate it using Bernoulli’s equation. It is definitely feasible if the conditions are met.
It is possible to determine the flow rate corresponding to a certain pressure by referring to the pump’s characteristic curve.
The operating point head can be set at the efficient point of both pumps
Theoretically, it’s possible; it’s just very difficult in practice.
Pneumatic control valves are installed after the outlet valves of each pump; a flow meter is placed after the control valves, and the pipelines from the pumps connect together after the flow meter. The control valves are adjusted via DCS, and by monitoring the flow rate, the desired result can be achieved. Without such online monitoring devices, it becomes very difficult to control the flow rate