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Originally Posted by Diablo
... How can you get more flow with serial connection of pumps? Doesn't it need to be parallel?
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An analogy is batteries in an electrical circuit.
In parallel you have more possible available current but the voltage is the same, so, for a given circuit resistance the current flow does not change.
In series the voltage is doubled, for the same circuit current is doubled.
Substitute Head/pressure for voltage, Flow for current and restrictivity for resistance. Add battery internal resistance, temperature coefficients etc and you can make the analogy rather accurate.
Except the PQ curve does not behave like the VI relationship. More like V-P...