Characteristic Curve of a Centrifugal Pump

In summary, the pump characteristic curve of a centrifugal pump can be plotted using the given details: delivery rate of 90 L/s against a static head of 12 m. To calculate the water delivered and total head pumped against, the equations H_{Total} = H_{static} + H_{friction} and \frac{H_{f1}}{H_{f2}} = (\frac{Q_{1}}{Q_{2}})^{2} can be used. However, the user is stuck and seeking assistance.
  • #1
Michael V
28
0

Homework Statement



The pump characteristic curve of a centrifugal pump can be plotted from the following details:

(See attachment)

The pump delivers 90 L/s when pumping against a static head of 12 m. Plot the pump characteristic curve from the details given and calculate:

1. The quantity of water delivered in L/s.
2. The total head pumped against, if the static head and pipe length are increased by 30%.

Homework Equations



[itex]H_{Total}[/itex] = [itex]H_{static}[/itex] + [itex]H_{friction}[/itex]

[itex]\frac{H_{f1}}{H_{f2}}[/itex] = [itex](\frac{Q_{1}}{Q_{2}})^{2}[/itex]

The Attempt at a Solution



If anyone can help me where to start. I drew the curve and now I'm completely stuck and confused. Any help will be greatly appreciated.
 

Attachments

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  • #2

FAQ: Characteristic Curve of a Centrifugal Pump

What is a characteristic curve of a centrifugal pump?

The characteristic curve of a centrifugal pump is a graphical representation of the relationship between the flow rate (Q) and the head (H) of the pump. It shows how the pump's performance changes as the flow rate increases or decreases.

How is a characteristic curve of a centrifugal pump created?

A characteristic curve is created by conducting experiments to measure the pump's performance at various flow rates. The data is then plotted on a graph with flow rate on the x-axis and head on the y-axis. This creates a curve that represents the pump's performance.

What is the significance of a characteristic curve in pump selection?

The characteristic curve is important in pump selection as it helps determine the most efficient operating point of the pump. By comparing the curve to the system curve (which represents the required flow and head for a specific application), the operating point can be identified. This ensures that the pump is operating at its most efficient point, resulting in cost savings and optimal performance.

What factors can affect the shape of a characteristic curve?

The shape of a characteristic curve can be influenced by various factors, such as the impeller diameter, speed of rotation, and fluid viscosity. Changes in these factors can alter the pump's performance and thus, the shape of the curve.

How can a characteristic curve be used to troubleshoot pump performance issues?

If a pump is not performing as expected, its characteristic curve can be compared to the original curve to identify any changes in performance. This can help pinpoint the cause of the issue, such as a clogged impeller or a decrease in pump speed, and allow for necessary adjustments to be made to restore the pump's performance.

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