Centrifugal pump combination: 1 parallel operation Two models of the same pump in parallel, the characteristic curve can be synthesized using a single pump characteristic curve. When the pipeline characteristic curve is unchanged, the flow increases in parallel, but less than the sum of the two single-pump flow, namely Q and <2Q single, and H and> H single pump parallel operation 2 series operation of the same two models Pump series, the characteristic curve can also be synthesized using a single pump characteristic curve. When the pipeline characteristic curve is unchanged, the indenter increases in series, but also less than the sum of two single-head pressure, that is, H series <2H single, and Q and> Q single. Series Operation of Pumps 3 Selection of Combination Modes If the value of () at both ends of the line is greater than the maximum head pressure that the pump can provide, it must be operated in series. For low resistance type pipeline (that is, the pipeline characteristic curve is relatively flat), the flow and pressure head delivered by the parallel pump are larger than the series pump. For the high resistance type pipeline (that is, the pipeline characteristic curve is relatively steep), the flow and pressure head delivered by the tandem pump are larger than the parallel pump. More Centrifugal Pumps Learn About Weidmul Pump Know Oh!