Centrifugal Pump Lab Report

Centrifugal Pump Lab Report-77
Now let deepen in the centrifugal pump performance test by the understanding of flowrate, total head, power, and efficiency.

Now let deepen in the centrifugal pump performance test by the understanding of flowrate, total head, power, and efficiency.

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The curve indicates the consumed power at 238.5 m³/h is 2600KW (power consumption was provided at the left side of the vertical axis).

Compare 2600 KW with datasheet value which is 2985 KW.

That is why they are using head instead of pressure.

The following formula converts pressure to the head; H(meter) = 10.2 P/SG or H(feet)= 2.3P/SG Once the rated flowrate has been determined, the designer subsequently specifies the total head (H) needed at this flowrate.

You need to match this curve with datasheet specification to make sure the pump passed the performance test.

Let's start with head-capacity curve, we draw a verticle line at 238.5 (in the horizontal axis), and it will cross head-capacity curve, then we draw a horizontal line from the cross point, and it crosses the vertical axis at 2640. What is the test result ( the head almost is 50.28 meters less than required value)? The API 610 at table 18 says the head can be /- 3% of the rated value.

This is expressed in meter or feet and represents the usable mechanical work transmitted to the fluid by the pump. The test is carried out at a nominally constant shaft speed, and the head (H) decreases as flowrate (q) increases, giving a negative slope to the curve.

(See above H-Q curve) Look at the following sketch; this illustrates a simple H-Q curve loop.

The capability of the pump at a certain RPM can be obtained from its Q-H curve.

The pump manufacturers are interested in providing pump performance curve in a way that does not depend on to the pumped fluid physical properties.

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