Buying Pump: Understanding Pump Curve

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Pump Curve: How the Flow rate will varies with the Head
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Pump Curve: How the Flow rate will varies with the Head

Understanding Pump Curve

What typically happens on eBay, online store or catalogue is that the suppliers will list the pump with the Maximum Head and Maximum Flow Rate. This information is incomplete and can be misleading;  as buyers often incorrectly assume that they are purchasing a Centrifugal Pump with Maximum Head at the Maximum Flowrate. A quality pump supplier will always be able to provide you with a pump curve. As you can see, the Total Dynamic Head on the Y-Axis will change with the Flowrate (Capacity-Litres Per Minute) on the X -Axis. For example, let's look at the CDX 120/07 pump curve. Since most centrifugal pump will rotate at a constant speed 2900rpm, with a predetermined impeller design; It will provide a lower flowrate (80 LPM) at a higher head (18m), and a higher flowrate (150LPM) at  a lower head (14m). Please note that the Head refers to the Total Dynamic Head (to be covered in another post) is different from the total height a pump is able to deliver the fluid, since we need to consider the entire pump system: Flow rate, Static Head, suction head or suction lift, diameter and length of discharge pipe etc. For further information, please contact Andrew at 0481-585-994 or visit us at our store.

If the pump curve is not available, you may be getting a pump at Maximum Head at Zero Capacity (i.e. Maximum pressure with zero flow) or Maximum Capacity at Zero Head (i.e. Maximum flow at Pump Outlet or ground level), neither of which are very useful. If in doubt, we can always provide you with technical advise in choosing the right pump for your application.
Ebara Pumps
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Ebara Pumps
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Ebara Pumps
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