The Online Pump Magazine 
22.09.2003 Pump HQ Curve 

The pumping performance of a centrifugal pump is expressed in the form of an HQ curve, depicting the Flow Q (e.g. in m³/h) and the Head H (e.g. in m) of the pump. The graph of the curve is shown dropping from top left to bottom right with increasing rate of flow. The slope of the curve is determined by the pump construction and particularly by the design of the impeller.
Though it is the frictional resistance of the installed pipe system which determines a given pump capacity, the respective pump can take up only one duty point on its curve. This duty point is the intersection of pump HQ curve with the system HQ curve.


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