Delta-P and flow in a series pump circuit
Delta-P and flow in a series pump circuit
(OP)
I am trying to solve a flow issue with our mold coolant system. I know that the higher the Delta-P in a closed single pump system the better your flow. If you were to take the discharge of that pump and plumb it into the inlet of a second pump in-turn connecting the second pumps discharge in to the inlet of your initial pump does the Delta-P theory invert? The lower the Delta-P the lower the restriction in the system increasing your flow in the circuit?
STC
STC





RE: Delta-P and flow in a series pump circuit
Please explain how a higher pressure drop makes the flow better. All it does is increase pumping power requirements and possible create noise.
For pumps in series, the flows are equal, the heads developed are additive.
The lower head the pump sees, the more flow it can produce. Look at the pump curve.
RE: Delta-P and flow in a series pump circuit
Other ways to increase flow in the system are to decrease resistance in the system, increase the speed of the pump, or add a larger impeller.
RE: Delta-P and flow in a series pump circuit
Thank you
STC
Attached is the initial tests I did on the system. The setpoint is a diff pressure controller on the pump skid.
I didn't have time to do extensive testing on the new arrangement before they took it over.