Centrifugal Pump Sizing

What is the name of this part of the pump?

• Volute

• Casing

• Impeller

• Cage

Select the correct arrangement.

• 
• 
• 
• 

Where should the duty point be relative to the BEP?

• 0% - 50%

• 50% - 75%

• 75% - 100%

• 100% - 110%

Which point corresponds to a lower motor RPM and lower pipe friction?

• 1

• 2

• 3

• 4

Answer explanation

Point 3 corresponds to the intersection of the unthrottled flow and lower RPM curves

Which system curve corresponds to this piping system?

• 
• 
• 
• 

Answer explanation

As there is no change in elevation there is no static head. Therefore, H=0 when Q=0

To decrease the risk of cavitation, you could:

• Increase NPSH(R)

• Increase NPSH(A)

• Decrease NPSH(R)

• Decrease NPSH(A)

When a pump develops the maximum head for a given speed, this is known as:

• Run-out

• Run-down

• Cavitation

• Dead Head

Answer explanation

Also known as Shut-off Head, the flowrate is zero at this condition.