What is the device characteristic curve?
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What is the performance characteristic curve for centrifugal pumps? How to determine the curve?
Once a centrifugal pump is manufactured, its various characteristics are fixed, including flow rate, head, net positive suction head, and rotational speed
The device characteristic curve is determined by factors such as frictional losses along the pipeline, local losses in the pipeline, and the pressure at the outlet. For example, closing the outlet valve increases the local pipeline losses, causing the device characteristic curve to become steeper; as a result, the point of intersection with the pump characteristic curve shifts toward lower flow rates
The characteristic curve of a centrifugal pump includes flow rate, head, speed, efficiency, and net positive suction head. Due to pipe friction, resistance is generated; at different flow rates, the flow velocity varies. For the same pipe, one flow rate corresponds to one flow velocity, which is ultimately represented by a curve. The characteristic curve of the device follows the same principle; it is the characteristic curve of the piping system.
The characteristic curve of a centrifugal pump includes flow rate, head, speed, efficiency, and net positive suction head. Due to pipe friction, resistance is generated; at different flow rates, the flow velocity varies. For the same pipe, one flow rate corresponds to one flow velocity, which is ultimately represented by a curve. The characteristic curve of the device follows the same principle; it is the characteristic curve of the piping system.
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The pump comes with its performance curve at the time of design and supply, while the unit has an operating curve
Piping curve: This curve changes when the outlet valve is adjusted, and it intersects the pump’s characteristic curve at one point