Pump in series and parallel pdf

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pump in series and parallel pdf

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What is the difference in arranging pumps in series and in parallel?

Pumps are used to transfer fluid in a system, either at the same elevation or to a new height. The needed flow rate depends on the height to which the fluid is pumped. Each pump has a head- discharge relationship that is inversely proportional i. This head-discharge relationship, also known as the pump characteristic curve, is provided by the pump manufacturer. Two pumps or typically more in practice can be combined in series to increase the height to which the fluid can be pumped at a given flow rate, or combined in parallel to increase the flow rate associated with a given value of head. In theory, if two pumps are combined in series, the pumping system will produce twice the head for a given flow rate. Similarly, if two pumps are combined in parallel, the pumping system is expected to have twice the flow rate of single pump for a given head.

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Sometimes the required operating conditions for a system are beyond the reach of a single, standard pump. Rather than purchasing a heavy duty pump that may be far more than you need, consider taking advantage of system design strategies to combine simple pump performances that add up to the necessary requirements. The following post walks you through pumps in series and in parallel so that you can get your ducks… I mean pumps… in a row — or side by side, depending on the application. Putting your centrifugal pumps in series, or connected along a single line, will let you add the head from each together and meet your high head, low flow system requirements. This is because the fluid pressure increases as the continuous flow passes through each pump, much like how a multi-stage pump works. For example, if two of the same pumps are in series, the combined performance curve will have double the head of a single pump for a given flow rate. For two different pumps, the head will still be added together on the combined pump curve, but the curve will most likely have a piecewise discontinuity meaning to curve with protusions as pictured in in the 2nd pump curve below.

Lab 3-pumps In Series And Parallel

In complex systems, pumps can be connected in series or in parallel. In serial operation the heads of the pumps are added and in parallel operation the flow rates capacities of the pumps are added. The experimental unit provides the determination of the characteristic behavior for single operation and interaction of two pumps. The speed of one motor is variably adjustable by a frequency converter. The other pump is fitted with a motor with fixed speed, this pump can be added to the system.


Pumps can be arranged and connected in serial or parallel to provide additional head or flow rate capacity. Centrifugal pumps in series are used to overcome larger system head loss than one pump can handle alone. With a constant flowrate the combined head moves from 1 to 2 - BUT in practice the combined head and flow rate moves along the system curve to point 3. Operation of single stage pumps in series are seldom encountered - more often multistage centrifugal pumps are used. Centrifugal pumps in parallel are used to overcome larger volume flows than one pump can handle alone.

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HM Base module for experiments in fluid mechanics. In complex systems, pumps can be connected in series or in parallel. In series operation the heads are added together and in parallel operation, the flow rates of the pumps are added. Series and parallel configuration of pumps behave similar to series and parallel configuration of electric resistances in electric circuits. The pump correlates with the electric resistance, the flow correlates with the electric current and the head with the voltage.

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